WO2015166672A1 - Production method for composite sheet for absorbent article, and production device - Google Patents
Production method for composite sheet for absorbent article, and production device Download PDFInfo
- Publication number
- WO2015166672A1 WO2015166672A1 PCT/JP2015/051386 JP2015051386W WO2015166672A1 WO 2015166672 A1 WO2015166672 A1 WO 2015166672A1 JP 2015051386 W JP2015051386 W JP 2015051386W WO 2015166672 A1 WO2015166672 A1 WO 2015166672A1
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- Prior art keywords
- sheet
- low
- stretchable
- portions
- composite sheet
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
Definitions
- the present invention relates to a method for manufacturing a composite sheet and an apparatus for manufacturing an absorbent article such as a disposable diaper.
- a composite sheet is generated by stacking and fixing a low stretch sheet on a stretch sheet that is transported in a stretched state at a predetermined stretch ratio in the transport direction. Has been done. And in such a composite sheet, it is normally conveyed to the lower process while maintaining the above-mentioned stretched state, and in the lower process, an absorbent main body that absorbs liquid is applied to the stretched composite sheet. Appropriate processing such as attachment is sequentially performed, and finally the product is divided into diaper units to produce the diaper.
- the manufactured diaper is provided to the market in a contracted form so that it can be extended at least until the heel is fully extended.
- a user such as a wearer can use a diaper having specifications that can be expanded and contracted.
- the present invention has been made in view of the above-described conventional problems, and an object thereof is to form a beautiful wrinkle on a composite sheet according to an absorbent article.
- the main invention for achieving the above object is: A method for producing a composite sheet having an elastic sheet according to an absorbent article and a low-extensible sheet having a lower extensibility than the elastic sheet, Preparing the low stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction; Fixing the stretchable sheet to the low stretchable sheet through a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet extended in the stretchable direction, In the fixing, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and adjacent to the stretch direction among the plurality of joint portions.
- the non-joint portion located between the mating joint portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. It is a manufacturing method of the composite sheet concerning an absorptive article characterized by providing the above-mentioned joined part.
- An apparatus for producing a composite sheet having a stretchable sheet according to an absorbent article and a low stretchable sheet having a lower stretchability than the stretchable sheet An apparatus for preparing the low-stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction; An apparatus for fixing the stretchable sheet to the low stretchable sheet via a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet stretched in the stretchable direction;
- the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and are adjacent to the stretch direction among the plurality of joint portions.
- the non-joining portion located between the joining portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively.
- FIG. 1A is a schematic perspective view of a pant-type diaper 1 as an example of an absorbent article according to the present embodiment
- FIG. 1B is a schematic plan view of the unfolded diaper 1 viewed from the skin side. It is a schematic perspective view which decomposes
- FIG. 4A is a schematic side view of the production line LM for manufacturing the diaper 1
- FIG. 4B is a schematic plan view showing how the diaper 1 is manufactured.
- 3 is a schematic side view of an exterior sheet generation processing unit 10.
- FIG. 1A is a schematic perspective view of a pant-type diaper 1 as an example of an absorbent article according to the present embodiment
- FIG. 1B is a schematic plan view of the unfolded diaper 1 viewed from the skin side. It is
- FIG. 7 is a view taken along arrow VII-VII in FIG. 6. It is an enlarged view which expands and shows the outer peripheral surface of the anvil roller 17a in the rotation direction.
- FIG. It is a schematic side view of the structure by which the heat-sealing apparatus or the crimping apparatus was provided instead of the ultrasonic welding apparatus 17 of the exterior sheet production
- FIG. It is explanatory drawing of other embodiment, Comprising: It is a perspective image figure which shows the mode of the process at the time of making the expansion-contraction direction of the elastic sheet 8a follow a CD direction.
- FIG. 11A is a schematic front view of the roll mechanism 13 ′ according to the other embodiment as viewed from the downstream side in the MD direction, and FIG. 11B is a view taken along the line BB in FIG. 11A.
- FIG. 10 is a schematic side view of a modification 30 ′ of the exterior sheet shrinkage processing unit 30.
- the non-joint portion located between the mating joint portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. It is a manufacturing method of the composite sheet concerning an absorptive article characterized by providing the above-mentioned joined part.
- a low-extensible sheet having the first part and the second part is prepared.
- the sheet has an extension amount of the first part and an extension amount of the second part.
- the low stretch sheet is likely to buckle in the predetermined direction based on the rigidity difference.
- the stretchable sheet in a stretched state is fixed to the low stretchable sheet.
- the stretchable sheet is stretched in the stretchable direction. Shrink in the predetermined direction.
- the contractive force in the predetermined direction is applied from the stretchable sheet to the low-extensible sheet via the joint portion of both sheets, and the contractive force is low extensibility as an external force of compression along the predetermined direction. Acts on the sheet. Therefore, the low-extensible sheet buckles based on the above-described rigidity difference and becomes wrinkled.
- the difference in rigidity is generated based on both the first portion and the second portion.
- the central position of the first portion and the central position of the second portion are at least One by one is included in the non-joined part.
- the non-joined portion in the low-extensible sheet can be quickly buckled, and as a result, the non-joined portion is quickly wrinkled. From the above, it is possible to form beautiful wrinkles on the composite sheet.
- a method for producing a composite sheet according to such an absorbent article In the preparation, preparing the low-extensible sheet formed such that a plurality of the second portions are arranged at a predetermined formation pitch along the predetermined direction, In the fixing, it is desirable to provide the joining portion so that the length of the non-joining portion in the expansion / contraction direction is larger than the formation pitch.
- the length of the non-joined portion is larger than the above-described formation pitch in which the second portions are arranged along the predetermined direction. Therefore, at least one of the center position of the first part and the center position of the two parts can be included in the non-joined part, whereby the non-joined part in the low-extensible sheet is quickly wrinkled. Come closer.
- the joint portion is provided so that a plurality of center positions in the predetermined direction of the first portion and a center position in the predetermined direction of the second portion are included in the non-joint portion.
- the non-joined portion includes a plurality of center positions of the first portion and a plurality of center positions of the second portion. Therefore, in such a non-joined portion, a difference in rigidity occurs at a plurality of positions in the predetermined direction. Therefore, the non-joined portion in the low stretch sheet can be buckled quickly at the plurality of positions, and as a result, the non-joined portion. There will be more traps.
- a method for producing such a composite sheet In the preparation, preparing the low-extensible sheet formed such that a plurality of the second portions are arranged at a predetermined formation pitch along the predetermined direction, In the fixing, it is desirable to provide the joining portion so that the length of the non-joining portion in the expansion / contraction direction is larger than the multiple of the formation pitch.
- the length of the non-joined part is made larger than the integral multiple of the formation pitch of the second part. Therefore, the non-joining portion can include a plurality of the center positions of the first portion and the center portion of the second portion, respectively, so that more non-joining portions in the low stretch sheet can be included. ⁇ comes to approach.
- the low extensibility sheet is a continuous sheet continuous in the predetermined direction
- the low-extensible sheet is conveyed with the predetermined direction as the conveying direction, and the first and second portions are formed on the low-extensible sheet being conveyed, It is desirable that the low-extensible sheet on which the first part and the second part are formed is conveyed toward a position where the fixing is performed without winding.
- the first part and the second part are formed on the low-extension sheet in preparation. Therefore, even a low-extensible sheet having specifications that do not have the first part and the second part from the beginning can be used as a material for the composite sheet. Further, after the first and second portions are formed, the low-extensible sheet is not taken up, and the sheet is conveyed as it is to the position where the fixing is performed. Therefore, it is possible to effectively prevent crushing the bulk of the low stretch sheet that has been increased with the formation of the first and second portions by winding, and as a result, the low stretch sheet is bulky. It can be finished into a sheet having a softness of origin.
- the low extensibility sheet is a continuous sheet continuous in the predetermined direction
- the stretchable sheet is a continuous sheet continuous in the stretch direction
- the stretchable sheet is transported with the stretch direction as the transport direction,
- the stretchable sheet to which the low stretchable sheet is fixed passes through the predetermined position in the transport direction after the fixing, the portions of the stretchable sheet that pass through the predetermined position are sequentially It is desirable to contract in the expansion / contraction direction.
- the predetermined sheet of the elastic sheet is used.
- the portion passing through the position is contracted in the expansion / contraction direction sequentially. Therefore, when the first portion and the second portion of the low-extension sheet pass through the predetermined position, wrinkles are sequentially formed on the sheet, and as a result, neat wrinkles are formed neatly on the composite sheet. be able to.
- a method for producing a composite sheet according to such an absorbent article In the preparation, the first portion and the second portion are formed on the low stretch sheet while a portion that is not stretched in the predetermined direction is generated at a predetermined position in a direction intersecting the predetermined direction. It is desirable to form.
- the first part and the second part when forming the first portion and the second portion side by side in a predetermined direction with respect to the low-extension sheet, A portion that does not extend in the predetermined direction is formed at the predetermined position. And the stretchability does not express in the part which is not extended
- the low extensibility sheet is a continuous sheet continuous in the predetermined direction, Forming the first part and the second part by passing the low extensible sheet between a pair of rolls rotating along the conveying direction while facing each other's outer peripheral surfaces;
- the pair of rolls are corrugated rolls in which crests and troughs are alternately formed on each outer circumferential surface along the rotation direction, and the crests of the pair of rolls are such that the crests of each other are the troughs.
- Rotate by meshing to enter the part It is desirable that the peak portion of at least one of the pair of rolls is discontinuously provided in a direction along the rotation axis of the roll.
- the first portion and the second portion can be formed by passing a low stretch sheet continuous in a predetermined direction between a pair of rolls. . Therefore, a 1st part and a 2nd part can be efficiently formed with respect to the said low extensible sheet
- a method for producing a composite sheet according to such an absorbent article It is desirable that the peak portion of the other roll of the pair of rolls is provided continuously in a direction along the rotation axis of the roll.
- a method for producing a composite sheet according to such an absorbent article In the fixing, the stretchable sheet and the low stretchable sheet are stacked in the thickness direction with the stretchable sheet and the low stretchable sheet overlapped with each other in the thickness direction.
- a pressure member By sandwiching with a pressure member, the joint is formed,
- One clamping member of the pair of clamping members has a plurality of protrusions in a pattern in which the plurality of joints are formed on a surface facing the low-extensible sheet, and the other clamping pressure It is desirable that the member has a surface portion that is larger than the top surface so as to receive the top surface of the protrusion on the surface facing the stretchable sheet.
- the protrusion is provided so as to face the extensible sheet, whereby the protrusion sandwiches the elastic sheet via the low extensible sheet. Press. Therefore, the situation where the elastic sheet is locally stretched thinly by the top surface of the protrusion is effectively suppressed.
- the extensibility of the low extensibility sheet located on the protrusion side is lower than that of the elastic sheet. Therefore, it is effectively avoided that the low extensible sheet is locally stretched thinly by the top surface of the protrusion, based on the low extensibility of the sheet. An amount of low stretch sheet can be left. As a result, the low-extensible sheet and the stretchable sheet are bonded with high bonding strength.
- An apparatus for producing a composite sheet having a stretchable sheet according to an absorbent article and a low stretchable sheet having a lower stretchability than the stretchable sheet An apparatus for preparing the low-stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction; An apparatus for fixing the stretchable sheet to the low stretchable sheet via a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet stretched in the stretchable direction;
- the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and are adjacent to the stretch direction among the plurality of joint portions.
- the non-joining portion located between the joining portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively.
- the composite sheet manufacturing apparatus relating to such an absorbent article, it is possible to form a beautiful wrinkle on the composite sheet with the same reason as described in the above manufacturing method.
- FIG. 1A is a schematic perspective view of a pant-type diaper 1.
- FIG. 1B is a schematic plan view of the unfolded diaper 1 as seen from the skin side.
- FIG. 2 is a schematic perspective view showing the exploded diaper 1 in an exploded state.
- the side that should be located on the skin side of the wearer is simply referred to as “skin side”, and on the other hand, on the non-skin side of the wearer.
- the side to be positioned is simply referred to as the “non-skin side”.
- the diaper 1 is, for example, a two-piece type diaper 1. That is, the diaper 1 has, as a first part, an absorbent main body 3 having a substantially rectangular shape in plan view that absorbs excretory fluid such as urine, and is provided to cover the non-skin side surface of the absorbent main body 3.
- the outer sheet 7 having a substantially hourglass shape in plan view that forms the outer casing of the diaper 1 is provided as the second component.
- the absorptive main body 3 has an absorptive core 3c that absorbs excretory fluid.
- the absorbent core 3c is formed by molding liquid absorbent fibers such as pulp fibers and liquid absorbent granular materials such as superabsorbent polymers into a substantially rectangular shape in plan view as an example of a predetermined shape.
- this absorptive core 3c may be coat
- the skin side surface of the absorbent core 3c is provided with a liquid-permeable top sheet 4 such as a nonwoven fabric so as to cover the surface.
- the non-skin side surface of the absorbent core 3c has the surface
- a liquid-impermeable leak-proof sheet 5 such as a film is provided so as to cover the entire surface.
- both the sheets 4 and 5 are formed in a substantially rectangular shape in plan view, and both the sheets 4 and 5 are outward from the respective end portions in the longitudinal direction of the absorbent core 3c. Jumped out. And the part 4eL which protruded in the top sheet 4 and the part 5eL which protruded in the leak-proof sheet 5 are mutually joined by adhesion
- the leak-proof sheet 5 is dimensioned so as to protrude outward from both sides of the absorbent core 3c, and the protruding portions 5eW and 5ew are respectively folded back to the skin side,
- the top sheet 4 is fixed by adhesion, welding or the like in a state of covering each end in the width direction. And thereby, the absorptive core 3c is made into the state wrapped by the top sheet
- 1B is a flexible sheet having a substantially hourglass shape in a plan view, and the sheet 7 has a thickness direction, a longitudinal direction, and a width direction as three directions orthogonal to each other. ing.
- the exterior sheet 7 is divided into three portions 7f, 7b, and 7c with respect to the longitudinal direction. That is, the exterior sheet 7 is formed on an abdominal side portion 7f disposed on the wearer's belly side, a back side portion 7b disposed on the wearer's back side, and a crotch portion 7c disposed on the wearer's crotch. It is divided.
- the crotch part 7c is located between the abdomen side part 7f and the dorsal side part 7b, so that the crotch part 7c has a shape that is constricted in the width direction in a substantially hourglass shape in plan view. This is part 7c.
- a so-called laminate sheet 7 having a two-layer structure is used for the exterior sheet 7. That is, the exterior sheet 7 has an inner layer sheet 8 that forms an inner layer facing the wearer's skin when the diaper 1 is worn, and an outer layer sheet 9 that forms an outer layer facing the non-skin side during the wearing,
- the inner layer sheet 8 and the outer layer sheet 9 are bonded together by adhesion or welding while being overlapped in the thickness direction.
- the joined portions j, j... which are joined portions are welded in a predetermined joining pattern formed by discontinuous dispersion (see FIG. 3), which will be described later.
- a stretchable sheet 8 having stretchability in the width direction of the diaper 1 is used.
- the material of the outer layer sheet 9 has a low extensibility in the width direction of the diaper 1.
- a low stretch sheet 9 is used.
- the stretchable inner layer sheet 8 is stretched to a predetermined stretch ratio such as 2.5 times the natural length in the width direction (hereinafter also referred to as the stretched state), and is also stretched in the width direction.
- both the sheets 8 and 9 are fixed integrally with the above-mentioned joining pattern. Therefore, when the stretched state is released, the inner layer sheet 8 shrinks in the width direction of the diaper 1 based on its own stretchability.
- the low stretchable outer layer sheet 9 has a plurality of hooks.
- the diaper 1 bends in the width direction, whereby the outer layer sheet 9 quickly follows the contraction of the inner layer sheet 8 and shortens the entire length in the width direction.
- the outer sheet 7 is shortened in the width direction as a whole, and the outer surface of the outer sheet 7 is caused by the bending of the outer layer sheet 9. It is in a state where several traps are approaching.
- the exterior sheet 7 can be stretched approximately elastically until the wrinkle is fully extended, whereby the exterior sheet 7 of the diaper 1 It has become a specification with elasticity.
- FIG. 3 is a schematic enlarged view of the exterior sheet 7 in the stretched state (first stretched state described later) in which the wrinkles are fully stretched and stretched in the width direction, from the outer layer sheet 9 side, in order to explain the device.
- the outer layer sheet 9 is formed with a plurality of bonding portions j, j... For bonding to the inner layer sheet 8.
- the parts j, j... Are provided in a discontinuous manner in both the width direction and the longitudinal direction.
- the non-joining part jn located at (the part jn that is not joined) has low rigidity due to the non-joining. Therefore, when the outer layer sheet 9 contracts in the width direction, wrinkles mainly occur at the non-joined portions jn, jn. And if the said wrinkle is approaching for every non-joining part jn, jn ... at this time, the appearance of the outer-layer sheet
- seat 9 will become favorable. That is, the appearance of the non-joint portion jn is better when there is less misalignment. In addition, the heel usually tends to move toward a portion having a difference in rigidity.
- a rigidity difference is given in advance to the non-joined portion jn with respect to the outer layer sheet 9 before being joined to the inner layer sheet 8. is doing.
- the application of the rigidity difference is realized as follows. That is, for the outer layer sheet 9, the first portions 9a1 extended in the width direction and the second portions 9a2 not extended more than the first portion 9a1 are alternately formed in the width direction. At least one center position C9a1 in the width direction of the first portion 9a1 and one center position C9a2 in the width direction of the second portion 9a2 are included in each non-joining portion jn.
- a plurality of joint rows Rj, Rj,... are arranged at a predetermined pitch PRj in the longitudinal direction, and the pitch PRj is arbitrary from a range of 1.5 mm to 5 mm, for example.
- a value is selected, preferably an arbitrary value from the range of 2 mm to 4 mm, more preferably from a range of 2 mm to 3 mm.
- it is smaller than the lower limit value of each range it is difficult to secure a sufficient size for forming the ridges in the non-joined portion jn.
- the elastic sheet 8a and Fixation with the low extensibility sheet 9at becomes weak. Therefore, it is preferable to be within the above range. However, it is not limited to the above range.
- the forming process for forming the first part 9a1 and the second part 9a2 the bonding process for forming the joints j, j... Will be described later.
- stretchability refers to the property that when an external force of tension is applied, it stretches approximately elastically in the direction of the external force and contracts approximately elastically when the external force is released. is there. Moreover, although it repeats, the sheet
- Such a stretchable sheet 8 desirably satisfies the following conditions. That is, in the state where both ends in the longitudinal direction of the belt-like sheet having a short dimension of 25 mm are equally gripped with the total length of 25 mm in the short direction, the both ends are each 1.0 (N) as a power point.
- the elongation (%) when pulled in the longitudinal direction by an external force is an arbitrary value in the range of 50% to 300%, and the residual elongation strain (%) that remains without contracting after the external force is released and contracted
- the value is an arbitrary value in the range of 0% to 40%.
- the elongation rate is an arbitrary value in the range of 70% to 200%
- the residual elongation strain is an arbitrary value in the range of 0% to 30%.
- the above-mentioned elongation rate (%) is the natural length L0, which is the length of the belt-like sheet at the time of no load before being pulled, from the length L1 of the belt-like sheet when pulled with an external force of 1.0 (N).
- the “low stretch sheet 9” is a stretch sheet lower than the stretch sheet 8 described above. That is, the stretch rate (%) when an external force of a predetermined amount of tension is applied is lower than the stretch rate (%) of the stretchable sheet 8 described above.
- the low-extensible sheet 9 desirably satisfies the following conditions. That is, in the state where both ends in the longitudinal direction of the belt-like sheet having a short dimension of 25 mm are equally gripped with the total length of 25 mm in the short direction, the both ends are each 1.0 (N) as a power point.
- the elongation (%) when pulled in the longitudinal direction by an external force is preferably an arbitrary value in the range of 0% to 20%. More preferably, the elongation rate is an arbitrary value in the range of 0% to 10%.
- a non-woven fabric, a woven fabric, or a film may be used as a form of the stretchable sheet 8 and the low stretchable sheet 9.
- the nonwoven fabric which can be utilized for the elastic sheet 8 it is appropriate to perform a gear stretching process or the like on a nonwoven fabric having a thermoplastic elastomer fiber exhibiting substantially elasticity and a thermoplastic resin fiber exhibiting substantially inelasticity.
- Examples of the nonwoven fabric subjected to various stretching treatments That is, by performing such stretching treatment, if the substantially inelastic thermoplastic resin fibers contained in the nonwoven fabric are plastically deformed or the joints between the fibers are destroyed, the substantially elastic fibers of the thermoplastic elastomer fibers can be obtained.
- the nonwoven fabric can be changed to a structure that hardly inhibits elastic deformation, whereby the stretchability of the nonwoven fabric is expressed and the stretchable sheet 8 can be used.
- the substantially elastic thermoplastic elastomer examples include polyurethane elastomers, polystyrene elastomers, polyolefin elastomers, polyamide elastomers, and the like.
- substantially inelastic thermoplastic resin fibers include fibers containing polyolefin resins, and examples of polyolefin resins include polyethylene (PE), polypropylene (PP), and ethylene- ⁇ olefin copolymers.
- PE polyethylene
- PP polypropylene
- ethylene- ⁇ olefin copolymers examples include polyethylene (PE), polypropylene (PP), and ethylene- ⁇ olefin copolymers.
- the stretchable sheet 8 is obtained by subjecting a mixed fiber type nonwoven fabric having polyurethane-based elastomer fibers and PP fibers to gear stretching treatment.
- seat 9 it laminates
- the fiber structure is not limited to a single fiber made of a single thermoplastic resin as described above.
- a composite fiber having a core-sheath structure in which the core material is PP and the sheath material is PE may be used, or a fiber having a structure other than these may be used.
- a spunbonded nonwoven fabric of PP fibers is used as the low stretch sheet 9.
- the absorptive main bodies 3 described above are arranged in the longitudinal direction at the center position in the width direction on the skin side surface of the exterior sheet 7 having such a two-layer structure, that is, the skin side surface of the inner layer sheet 8. It is attached with the direction aligned. Such attachment is performed by joining at least the end portions 3e, 3e in the longitudinal direction of the absorbent main body 3 to the exterior sheet 7. In this example, as shown in FIG. 2, each end portion 3e, 3e is attached. Are formed in a substantially T-shape with joint portions j3 and j3 for joining the absorbent main body 3 and the exterior sheet 7, respectively.
- each joint j3, j3 extends toward the crotch portion 7c starting from the laterally long strip portion j3W that is long in the width direction of the diaper 1 and the central portion in the lateral direction of the lateral strip portion j3W. And a vertically long belt-like portion j3L. And this effectively avoids that the absorptive main body 3 and the exterior sheet 7 restrain each other more than necessary.
- the shape of the joint j3 is not limited to this.
- a dotted joint j3C may be additionally provided at a position between the pair of T-shaped joints j3 and j3, or the end portions 3e and 3e of the absorbent main body 3 may be abbreviated.
- a joint portion (not shown) having a substantially rectangular shape extending over the entire area may be formed at each of the end portions 3e and 3e, or a joint portion having a shape other than the shape described above may be formed.
- the formation of the joint j3 is realized by adhesion of a hot melt adhesive, but is not limited to this, and may be, for example, welding.
- attachment of this absorptive main body 3 and the exterior sheet 7 is the expansion
- FIG. 4A is a schematic side view of a production line LM for producing the diaper 1.
- FIG. 4B shows a state in which the diaper 1 is manufactured in a schematic plan view corresponding to FIG. 4A.
- a base sheet 7a (corresponding to a composite sheet) of the diaper 1 is generated. Then, the base sheet 7a is continuously transported along a predetermined transport direction by an appropriate transport mechanism CV, CV, etc., and during the transport, punching and parts are performed on the base sheet 7a. The base sheet 7a sequentially changes its state each time, such as attachment, and finally the diaper 1 having the state shown in FIG. 1A is manufactured.
- the base sheet 7a is basically conveyed in a so-called lateral flow mode. That is, the base material sheet 7a is conveyed in a state in which portions corresponding to the diaper 1 are aligned in a line in the conveyance direction while aligning the direction corresponding to the width direction of the diaper 1 in the conveyance direction.
- Examples of the transport mechanism CV used for the transport include a transport roller, a suction belt conveyor having a suction holding function on a belt surface as a mounting surface, and a base sheet 7a between endless belts arranged in pairs in the vertical direction.
- a belt conveyor or the like serving as the transport path is used.
- a plurality of processing units 10, 20,... are arranged side by side in the transport direction in order to perform the various processing processes.
- the exterior sheet generation processing unit 10 the leg hole opening formation processing unit 20, the exterior sheet contraction processing unit 30, the absorbent main body attachment processing unit 40, and the two-fold processing unit 50.
- an end seal processing unit 60 and a split processing unit 70 are arranged side by side in the transport direction in order to perform the various processing processes.
- the conveyance direction set on the production line LM is referred to as “MD direction”.
- One of the two directions orthogonal to the MD direction is referred to as “CD direction”, and the other is referred to as “Z direction”.
- the CD direction is parallel to the width direction of the substrate sheet 7a, and in FIG. 4A, the CD direction is the direction penetrating the paper surface.
- the Z direction is parallel to the thickness direction of the base sheet 7a.
- the MD direction corresponds to both the “stretching direction” and the “predetermined direction”
- the CD direction crosses the “direction intersecting the stretching direction” and the “predetermined direction”. It corresponds to both “direction”.
- FIG. 5 is a schematic side view of the exterior sheet generation processing unit 10 as the first processing unit.
- this processing unit 10 using the processing device 11 and the joining device 15, as the base sheet 7a of the diaper 1, a continuous sheet 7a of the exterior sheet 7 that is continuous in the MD direction (hereinafter simply referred to as the exterior sheet 7a).
- the continuous sheet 9 a of the low-extension sheet 9 (hereinafter, simply referred to as “low-extension sheet 9 a”) serving as the outer layer sheet 9 is conveyed along the MD direction.
- the aforementioned first portion 9a1 and second portion 9a2 are alternately formed in the MD direction with respect to 9a (corresponding to “preparing”).
- a continuous sheet 8 a of the stretchable sheet 8 (hereinafter simply referred to as “stretchable sheet 8 a”) that is the inner layer sheet 8 that is conveyed with the stretchable direction along the MD direction is substantially omitted.
- the sheet is stretched in the MD direction from a natural length state to a predetermined stretching magnification, and the low-stretch sheet 9a is overlapped and joined to the sheet 8a from the thickness direction in this stretched state (corresponding to “fixing”). .
- the exterior sheet 7a is generated.
- FIG. 6 is a schematic side view of the processing apparatus 11 shown partially enlarged.
- FIG. 7 is a view taken along arrow VII-VII in FIG.
- the processing apparatus 11 includes a transport mechanism 12 that transports the low-extensible sheet 9 a along the MD direction, and a corrugated roll mechanism 13.
- the transport mechanism 12 has, for example, a plurality of transport rollers 12R, 12R,... That rotate around a rotation axis along the CD direction, and each transport roller 12R is disposed along the transport path of the low-extensible sheet 9a. ing.
- peripheral speed value V12R (m / min) of each conveying roller 12R is substantially the same as the conveying speed value (m / min) of the low-extensible sheet 9a conveyed from the upstream process.
- the transport mechanism 12 transports the low-extensible sheet 9a in a state in which the low-stretch sheet 9a is stretched so as not to stretch and to loosen.
- the corrugated roll mechanism 13 includes a pair of upper and lower corrugated rolls 13 u and 13 d that rotate around the rotation axis along the CD direction with their outer peripheral surfaces facing each other. And in the outer peripheral surface of each corrugated roll 13u, 13d, while the peak part 13m and the trough part 13v are alternately formed along the rotation direction, respectively, each peak part 13m and each trough part 13v are respectively It extends in the CD direction. Moreover, as shown in the enlarged view in FIG. 6, when each corrugated roll 13u, 13d is rotating, the peak 13m of one corrugated roll 13u (13d) is the valley of the other corrugated roll 13d (13u). The mountain portions 13m and the valley portions 13v are engaged with each other with a slight gap so as to enter 13v. And during the rotation, the low-extensible sheet 9a is passed along the MD direction between the corrugated rolls 13u and 13d.
- the low-extensible sheet 9a that is passing is in the other corrugated roll 13d (13u), the other ridges 13m, 13m adjacent to each other and the valley 13v between the ridges 13m, 13m.
- the corrugated roll 13u (13d) is deformed into a three-point bend by the crest 13m (FIG. 6).
- the portion 9a2 that contacts the top surface of the peak portion 13m of one of the corrugated rolls 13d (13u) in the low-extension sheet 9a is in contact with the top surface so as to be relatively unmovable.
- the second portion 9a2 is not stretched, and the portion 9a2 that is in contact with the top surface of the peak portion 13m of the other corrugated roll 13u (13d) in the sheet 9a is also generally immovable relative to the top surface.
- the second portion 9a2 is formed without being substantially stretched.
- the portion 9a1 between the two second portions 9a2 and 9a2 is stretched based on the above-described intrusion of the mountain portion 13m, so that the portion 9a1 becomes the above-described first portion 9a1.
- the first portion 9a1 and the second portion 9a2 are alternately formed in the MD direction on the low-extension sheet 9a, and then the sheet 9a is stretched by the conveying roller 12R. It is sent to the joining device 15.
- the formation pitch Pv in the rotation direction of the valley portion 13v is equal to the formation pitch Pm in the rotation direction of the peak portion 13m (the top surface of the peak portion 13m).
- the formation pitch Pm of the crest 13m is equal to each other between the upper and lower corrugated rolls 13u and 13d.
- the pair of corrugated rolls 13u and 13d are arranged at the intermediate position between the crest 13m and crest 13m adjacent to each other in the rotation direction of the other roll 13d (13u). It rotates while the center position of the rotational direction of the peak 13m of 13d is located. Therefore, as shown in FIG. 3, the second portion 9a2 is formed at a predetermined formation pitch P9a2 in the MD direction.
- an arbitrary value is selected from a range of 0.5 mm to 3.0 mm, and preferably an arbitrary value within a range of 0.7 mm to 2.0 mm. More desirably, the value is set to an arbitrary value in the range of 1.0 mm to 1.5 mm. And if it is in such a range, the wrinkle of the size comfortable to an eye can be formed in outer layer sheet 9a.
- the peak portion 13m of one corrugated roll 13u of the pair of corrugated rolls 13u, 13d is placed in the CD direction ("direction intersecting a predetermined direction" and "rotating axis"). Are cut out at predetermined positions Pk, Pk. As a result, the peaks 13m are discontinuously provided for the following reason.
- a non-woven fabric of PP fiber is used as the low-extension sheet 9a, it is not always necessary to partially cut out the peak portion 13m, that is, a pair in which the peak portion 13m is not cut out at all.
- the low-extension sheet 9a can maintain the state of low extensibility as usual, that is, can function as a sheet with low extensibility.
- a sheet containing an appropriate elastomer fiber in addition to the PP fiber may be used as the low-extension sheet 9a.
- the sheet 9a has developed elasticity, and as a result, The state of low extensibility cannot be maintained. That is, when the substantially inelastic PP fiber in the sheet 9a is plastically deformed by the above three-point bending-shaped stretching process, the stretched PP fiber can inhibit the substantially elastic stretching deformation of the elastomer fiber. No state. Then, thereafter, the sheet 9a is in a state where it can be freely stretched and deformed based only on the elastomer fibers, that is, in a state where stretchability is exhibited.
- a pair of corrugated waves is used for the purpose of suppressing the expression of the stretchability that may occur after passing through the corrugated roll mechanism 13 with respect to the low stretchable sheet 9a of any composition.
- the peak portion 13m of one of the corrugated rolls 13u of the rolls 13u and 13d is cut out at predetermined positions Pk, Pk... In the CD direction, thereby providing the peak portions 13m discontinuously. That is, in this case, the peak portion 13m does not exist at the predetermined position Pk, and thus the above three-point bend-shaped stretching process is not performed at the same position Pk. As a result, at least the position Pk is stretchable.
- the peak portions 13m may be provided continuously over the CD direction, but may be provided discontinuously. However, it is preferable to provide the peak portions 13m continuously because it is not necessary to perform processing for making the peak portions 13m discontinuous.
- a heater is incorporated in at least one of the pair of upper and lower corrugated rolls 13u and 13d, thereby adjusting the temperature of the peak portion 13m of the corrugated rolls 13u and 13d. You may do it. And if it does in this way, since the low extension sheet
- an adjusting the heating temperature an arbitrary value in which the temperature of the peak portion 13 m is in the range of 25 to 40 ° C. can be exemplified.
- preheating rolls 14 a and 14 b may be disposed at a position upstream of the corrugated roll mechanism 13 in the MD direction.
- the preheating rolls 14a and 14b are also rollers that rotate around a rotation axis along the CD direction.
- a heater is provided inside the rollers 14a and 14b, and the outer peripheral surfaces of the rollers 14a and 14b are provided by the heater. Can be heated.
- the low-extensible sheet 9a is conveyed in the MD direction when the rolls 14a and 14b rotate in a state of being wound around the outer peripheral surfaces of the preheating rolls 14a and 14b.
- the conductive sheet 9a is heated.
- the joining device 15 includes a nip roll mechanism 16 and an ultrasonic welding device 17 disposed downstream of the mechanism 16 in the MD direction. And in this joining device 15, the stretchable sheet 8a conveyed in an approximately natural length state from the upstream process is stretched in the MD direction between the nip roll mechanism 16 and the ultrasonic welding device 17 up to the stretch magnification described above, Then, while maintaining this stretched state, the ultrasonic welding device 17 welds and joins the sheet 8 a to the low stretch sheet 9 a fed from the corrugated roll mechanism 13.
- the nip roll mechanism 16 has a pair of nip rolls 16R and 16R that rotate around a rotation axis along the CD direction.
- the elastic sheet 8a continuously conveyed from the upstream process is driven with a driving force applied from a servo motor (not shown) as a driving source while the pair of nip rolls 16R and 16R are sandwiched between the outer peripheral surfaces.
- the sheet 8a is sent to the ultrasonic welding device 17 with a conveyance speed value substantially equal to the peripheral speed value V16R of the nip rolls 16R and 16R.
- the ultrasonic welding device 17 includes a horn 17h having a vibration surface 17hs that vibrates in a normal direction with a predetermined frequency of 20 kHz to 35 kHz and a predetermined amplitude of 1 to 30 microns, and the vibration surface 17hs of the horn 17h.
- An anvil roller 17a that receives vibrations on the outer peripheral surface.
- the anvil roller 17a is supported so as to be rotatable around a rotation axis along the CD direction, and is driven to rotate by being applied with a driving force from a servo motor (not shown) as a driving source.
- both the low stretch sheet 9a sent from the corrugated roll mechanism 13 and the stretchable sheet 8a sent from the nip roll mechanism 16 have almost no relative slip with respect to the outer peripheral surface. For example, it is wound at a winding angle of 45 ° or more. Therefore, when the anvil roller 17a is driven to rotate, both the stretchable sheet 8a and the low-extensible sheet 9a have the same conveying speed value V8a9a as the peripheral speed value V17a of the anvil roller 17a. Conveyed along.
- the transport speed value V8a9a is as large as the expansion magnification times the peripheral speed value V16R of the nip roll 16R of the nip roll mechanism 16 as described above. Therefore, the stretchable sheet 8a is stretched to the above-described stretch ratio and is wound around the outer peripheral surface of the anvil roller 17a.
- the transport speed value V8a9a is substantially the same as the peripheral speed value V12R of the transport roller 12R of the low-extensible sheet 9a. Therefore, the low-extensible sheet 9a is wound around the outer peripheral surface of the anvil roller 17a in a state in which the low-extensible sheet 9a is not stretched and is not loosened.
- the stretchable sheet 8a stretched to the stretch magnification and the stretchable low stretchable sheet 9a are superposed on each other in the thickness direction on the outer peripheral surface of the anvil roller 17a, and
- ultrasonic vibration energy is applied to the sheets 8a and 9a from the vibration surface 17hs of the horn 17h.
- the sheets 8a and 9a are joined in a joining pattern in which a plurality of joining portions j, j... Are discontinuously dispersed as described above, and the exterior sheet 7a is generated. .
- the exterior sheet 7a is sent to the downstream in the MD direction by the anvil roller 17a, so that the delivered exterior sheet 7a has a conveyance speed value V8a9a substantially equal to the peripheral speed value V17a and downstream in the MD direction. It is conveyed to the leg hole opening forming processing unit 20.
- the vibration surface 17hs of the horn 17h is a plane whose normal direction is the vibration direction.
- a plurality of protrusions 17at, 17at,... are arranged in an arrangement pattern corresponding to the joining pattern in order to form the joints j, j,. (Refer to the enlarged view showing the outer peripheral surface of the anvil roller 17a in FIG. 8 developed in the rotational direction). Then, when the vibration surface 17hs of the horn 17h selectively hits the portion of the low-extensible sheet 9a that contacts the top surface of the protrusion 17at, ultrasonic vibration energy is input and melted. ..
- the joining pattern is a staggered pattern as described above (FIG. 3), as shown in FIG. 8, the plurality of protrusions 17at, 17at ... are provided in a staggered pattern. Furthermore, since it is a transverse flow conveyance, the width direction of the diaper 1 is along the MD direction and the rotation direction of the anvil roller 17a.
- At least one center position C9a1 in the width direction of the first portion 9a1 of the sheet 9a and a center position C9a2 in the width direction of the second portion 9a2 are included in the non-joining portion jn of the low-extension sheet 9a.
- the protrusions 17at, 17at,... are arranged so that the relationship (FIG. 3) is established in the MD direction.
- the length Ljn in the MD direction of the non-joining portion jn in FIG. 3 is larger than the formation pitch P9a2 of the second portion 9a2 in the sheet 9a so that the above relationship is established.
- each of the protrusions 17at, 17at ... is arranged. That is, in the example of FIG.
- the length L17an in the MD direction of the non-existing portion 17an of the protrusion 17at located between the protrusions 17at and 17at is the formation pitch P9a2 of the above-described second portion 9a2 (FIG. 3). Is bigger than.
- each non-joined part jn in the low stretchable sheet 9a is based on the rigidity difference between the first part 9a1 and the second part 9a2. As a result, it buckles quickly, and as a result, the non-joint portion jn is surely wrinkled and the appearance of the outer layer sheet 9a is improved as a whole.
- the length Ljn of the non-joining portion jn is set to be not more than twice the formation pitch P9a2 of the second portion 9a2, but this is not restrictive.
- the length Ljn in the MD direction of the non-joining part jn may be made larger than the multiple of the formation pitch P9a2 in the MD direction of the second portion 9a1.
- the center position C9a1 in the MD direction of the first portion 9a1 and the center position C9a2 in the MD direction of the second portion 9a2 are each included in the non-joint portion jn.
- the square was illustrated as a planar shape of the top surface of the protrusion 17at of the anvil roller 17a, it is not limited to this.
- it may be a regular polygon of a regular pentagon or more, a regular circle, or a shape other than these.
- a low-extensible sheet 9a is arranged facing the outer peripheral surface of the anvil roller 17a (corresponding to “one clamping member”), and a horn 17h (“the other clamping member”) is arranged.
- the stretchable sheet 8a is disposed to face the vibration surface 17hs (corresponding to the “surface portion”) of the “pressure member”), the invention is not limited to this and may be reversed. That is, the stretchable sheet 8a may be disposed facing the outer peripheral surface of the anvil roller 17a, and the low-extensible sheet 9a may be disposed facing the vibration surface 17hs of the horn 17h.
- the former is preferable from the viewpoint of improving the joint strength of the joint j.
- the vibration surface 17hs of the horn 17h is opposed to the elastic sheet 8a, and the area of the vibration surface 17hs is the outer peripheral surface of the anvil roller 17a. It is made larger than the area of the top surface of the protrusion 17at. Moreover, the protrusion 17at of the outer peripheral surface of the anvil roller 17a is provided facing the low-extension sheet 9a, and thereby the protrusion 17at sandwiches the elastic sheet 8a via the low-extension sheet 9a. Therefore, the situation where the elastic sheet 8a is locally thinly stretched by the top surface of the protrusion 17at and effectively penetrates is effectively suppressed.
- the low-extensible sheet 9a and the stretchable sheet 8a can be bonded with high bonding strength.
- the exterior sheet formed by joining the stretchable sheet 8a and the low stretchable sheet 9a even after the stretchable sheet 8a is separated from the vibration surface 17hs of the horn 17h. 7a is maintained in a state of being wound around the anvil roller 17a for a while.
- the shrinkage deformation in the CD direction of the exterior sheet 7a is effectively suppressed.
- the winding is realized by disposing the transport roller 18R at the downstream position in the MD direction so as to face the outer peripheral surface of the anvil roller 17a.
- the exterior sheet 7a is wound around the anvil roller 17a and the transport roller 18R in an S shape so that the exterior sheet 7a is wound around the anvil roller 17a even at a position downstream of the vibration surface 17hs in the MD direction.
- the state is maintained.
- it is not limited to this.
- the low-extensible sheet 9a is in a stretched state.
- the low-extension sheet 9a is in a state in which it is difficult to extend any more based on the low stretchability. That is, it is in a so-called non-elongation state. Therefore, even if an unexpectedly large tension acts during the subsequent conveyance, the low-stretch sheet 9a can resist the tension so that the length of the exterior sheet 7a in the MD direction does not change. Therefore, the formation process of the leg opening 7HL that is performed on the exterior sheet 7a thereafter can be performed with high positional accuracy.
- non-stretched state for example, “the sheet is not damaged, and further, the sheet is kept in a state of being stretched further by 5% or more from the current state. It can be said that the state does not expand.
- the above-mentioned “stretching magnification” indicates how many times the total length of the stretchable elastic sheet 8a is stretched to the natural length before stretching, and the stretching magnification is the completed state. It defines how much the exterior sheet 7 (7a) in the diaper 1 can be extended in the width direction from the unloaded state. That is, in the diaper 1 manufactured by setting the stretchable sheet 8a to a predetermined stretch magnification, the exterior sheet 7 (7a) is stretched in the width direction of the diaper 1 until the stretched state corresponds to the stretch magnification. Can do.
- the expansion magnification is set to an arbitrary value in the range of 1.5 to 4 times, for example, and in this example, the expansion magnification is set to 2.5 times.
- first stretched state the state in which the stretchable sheet 8a is stretched to the stretch magnification set by the exterior sheet generation processing unit 10 is referred to as a “first stretched state”.
- leg opening formation processing unit 20 Even in the next leg-hole opening formation processing unit 20, the extended state of the exterior sheet 7a is maintained in the first extended state described above. Then, as shown in FIGS. 4A and 4B, in the leg opening formation processing unit 20, the leg opening is formed at a predetermined first pitch P ⁇ b> 1 with respect to the exterior sheet 7 a conveyed in the first extended state.
- the part 7HL is formed by punching.
- the first pitch P1 corresponds to the length of one diaper 1 in the MD direction in the first extended state. Therefore, one leg opening 7HL is formed in the exterior sheet 7a for each part that becomes the diaper 1. Incidentally, the length of one diaper 1 changes according to the extended state of the exterior sheet 7a. For example, when the stretched state is relaxed and the exterior sheet 7a contracts, the length of one diaper 1 in the MD direction is shortened by the contraction.
- the formation process of the leg opening 7HL is performed by the die cutter device 21.
- the die cutter device 21 has a pair of upper and lower rolls 21u and 21d that rotate around a rotation axis along the CD direction with the outer peripheral surfaces facing each other.
- the upper roll 21u is a cutter roll 21u having a cutter blade 21c on the outer peripheral surface
- the lower roll 21d is an anvil roll 21d that receives the cutter blade 21c on a smooth outer peripheral surface.
- the cutter blade 21c is an annular so-called punching blade corresponding to the shape of the leg opening 7HL, and protrudes from the outer peripheral surface of the cutter roll 21u.
- the drive source of the drive rotation of the upper and lower rolls 21u, 21d is a servo motor (not shown). Further, only one cutter blade 21c is provided on the outer peripheral surface of the upper roll 21u. Therefore, each time the exterior sheet 7a passes through the die cutter device 21 by the length of the first pitch P1 in the MD direction, the upper roll 21u and the lower roll 21d each make one rotation, whereby the exterior sheet 7a
- the leg opening 7HL is formed at the first pitch P1.
- a leg hole opening 7HL is formed in the exterior sheet 7a at a pitch corresponding to the length of one diaper 1 in the first extended state. In the extended state of 1, the sheet is sent to the exterior sheet shrinkage processing unit 30 downstream in the MD direction.
- Exterior sheet shrinkage processing unit 30 In the next exterior sheet shrinkage processing unit 30, as shown in FIGS. 4A and 4B, the exterior sheet 7a conveyed in the first extended state is contracted in the MD direction.
- the extension state of the extension ratio smaller than the extension ratio in the extension state (hereinafter referred to as the second extension state).
- the amount of expansion of the exterior sheet 7a is reduced so that the expansion ratio, which was 2.5 times in the first extended state, is 2.25 times, which is 10% smaller. And this suppresses generation
- the extension magnification in the first extension state is referred to as “first extension magnification M1”
- the extension magnification in the second extension state is referred to as “second extension magnification M2”.
- the shrinking process of the exterior sheet 7a is performed by the two nip roll mechanisms 31 and 33 provided side by side in the MD direction. That is, an upstream nip roll mechanism 31 is disposed at a predetermined position in the MD direction, and a downstream nip roll mechanism 33 is disposed at a position downstream of the upstream nip roll mechanism 31. Both nip roll mechanisms 31 and 33 have substantially the same configuration. That is, the upstream nip roll mechanism 31 has a pair of upper and lower nip rolls 31u and 31d that rotate around the rotation axis along the CD direction, and the downstream nip roll mechanism 33 also rotates around the rotation axis along the CD direction.
- the nip rolls 31u and 31d receive driving force from a servo motor (not shown) as a driving source.
- the exterior sheet 7a is fed downstream in the MD direction by being applied and rotated.
- the nip rolls 33u and 33d of the downstream nip roll mechanism 33 sandwich the outer sheet 7a between the outer peripheral surfaces of the downstream nip roll mechanism 33, the nip rolls 33u and 33d are driven by a servo motor (not shown) as a drive source. By applying driving force and driving rotation, the exterior sheet 7a is sent further downstream in the MD direction.
- the peripheral speed value V31 (m / min) of the nip rolls 31u and 31d of the upstream nip roll mechanism 31 is substantially the same value as the peripheral speed value V17a (m / min) of the anvil roller 17a of the ultrasonic welding device 17 described above.
- the peripheral speed value V31 of the nip rolls 31u, 31d is the first transport speed that is the transport speed value (m / min) of the outer sheet 7a that is transported in the first extended state on the most upstream side thereof. It is almost the same value.
- the peripheral speed value V33 (m / min) of the nip rolls 33u and 33d of the downstream nip roll mechanism 33 is 10% smaller than the peripheral speed value V31 of the nip rolls 31u and 31d of the upstream nip roll mechanism 31.
- the stretched state of the sheet 7a is 10 more than the stretch magnification in the first stretched state. It is shrunk to the second extension state where the extension ratio is small by%. And this exterior sheet
- the conveyance of the exterior sheet 7a after the contraction process is basically performed in the second extended state.
- the conveyance speed value of the exterior sheet 7a is the above-described first conveyance. This is realized by maintaining the conveyance speed value smaller than the speed value by a rate corresponding to the above-described contraction (hereinafter referred to as the second conveyance speed value).
- the second transport speed value can be referred to as “a value obtained by multiplying the first transport speed value by a division value obtained by dividing the second expansion ratio by the first expansion ratio”.
- the percentage notation value is the shrinkage rate (%).
- the shrinkage rate is 10% as described above, but the present invention is not limited to this. That is, an arbitrary value may be set as long as it can be contracted while maintaining the stretched state of the exterior sheet 7a, for example, an arbitrary value in the range of 2% to 80% may be used.
- the narrow value may be an arbitrary value in the range of 5% to 50%, and the narrow value may be an arbitrary value of 7% to 30%.
- the absorptive main body 3 is attached at the second pitch P2 in the MD direction to the exterior sheet 7a conveyed in the second extended state.
- the second pitch P2 corresponds to the length of one diaper 1 in the MD direction in the second extended state, but the second extended state is, as described above, the first This is a contracted state rather than the stretched state of 1. Therefore, the second pitch P2 is a value smaller than the first pitch P1 by the contraction rate.
- the absorptive main body 3 is attached to the position between the leg periphery openings 7HL and 7HL adjacent to each other in the MD direction in the exterior sheet 7a.
- the mounting process of the absorbent main body 3 is performed by, for example, the rotating drum device 41.
- the rotary drum device 41 includes a rotary drum 42 that rotates about a rotation axis along the CD direction, a servo motor (not shown) that drives and rotates the rotary drum 42, and a rotational direction on the outer peripheral surface of the rotary drum 42. And a plurality of holding pads 43 arranged side by side.
- Each holding pad 43 has a holding surface capable of sucking and holding the absorbent main body 3, and each holding surface faces outward in the rotational radius direction of the rotating drum 42. Then, by rotating around the rotation axis located at the center of the holding surface, each holding pad 43 can change the longitudinal direction of the absorbent main body 3 being held by the holding surface from the MD direction to the CD direction. is there.
- Each holding pad 43 is configured to be reciprocally movable over a predetermined range in the rotational direction relative to the rotary drum 42, and the reciprocating operation is performed by an appropriate cam mechanism (not shown). Created from the rotational motion of the rotating drum 42. Accordingly, the pitch between the holding pads 43 adjacent to each other in the rotation direction can be changed according to the position of the rotation drum 42 in the rotation direction. That is, at the first position S1 in the rotation direction, the gap between the adjacent holding pads 43 and 43 can be made narrow, and at the second position S2 in the rotation direction, the holding pads 43 and 43 The interval between them can be greatly opened.
- the first position S1 is supplied in the form of a continuous body 3a in which a plurality of absorbent main bodies 3 are continuously formed in the MD direction.
- the cutter apparatus 45 located in the vicinity WHEREIN:
- the continuous body 3 a is divided to generate a single-cut absorbent main body 3 on the holding pad 43.
- the holding pad 43 is moved to the second position S2 in the rotation direction by the rotating operation of the rotating drum 42. During the movement, the holding pad 43 performs the above-described rotation operation to perform the rotation of the absorbent main body 3.
- the direction of the longitudinal direction is changed from the MD direction to the CD direction.
- the holding pad 43 performs the above-described reciprocating movement to change the pitch between the adjacent holding pads 43 and 43 to the second pitch P2.
- the conveyance path of the exterior sheet 7a is disposed close to the second position S2. Therefore, the rotary drum device 41 can attach the absorbent main body 3 at the second pitch P2 in the MD direction with respect to the second extended exterior sheet 7a.
- the exterior sheet 7a to which the absorbent main body 3 is attached is folded in two in the CD direction with the substantially central portion in the CD direction corresponding to the crotch part 7c of the diaper 1 as the folding position.
- the exterior sheet 7a is brought into a state where one end and the other end in the CD direction of the sheet 7a are overlapped in the thickness direction.
- one end portion finally becomes the ventral side portion 7f of the diaper 1, and the other end portion becomes the back side portion 7b of the diaper 1.
- the folding process of the exterior sheet 7a is performed by a bi-fold guide member (not shown) disposed at a predetermined position in the MD direction.
- the bi-fold guide member has a well-known configuration, for example, a combination of a plurality of appropriate bar members. Then, when the exterior sheet 7a passes through the position where the bifold guide member is disposed, the exterior sheet 7a is gradually folded by the guide member with the substantially central portion in the CD direction being the folding position. When it has passed, the exterior sheet 7a is folded in two.
- the stretched state of the exterior sheet 7a in the bi-fold processing unit 50 is maintained in the above-described second stretched state, and the exterior sheet 7a is sent downstream in the MD direction in this stretched state. Is done. That is, the conveyance speed value of the exterior sheet 7a in the bi-fold processing unit 50 is maintained substantially the same as the above-described second conveyance speed value.
- End seal processing unit 60 Even in the next end seal processing unit 60, the exterior sheet 7a is maintained in the second extended state.
- the end seal processing unit 60 fixes the folded outer sheet 7a in the folded state. That is, one end and the other end in the CD direction of the exterior sheet 7a overlapped in the thickness direction by folding in two are welded at positions between the absorbent bodies 3 and 3 adjacent in the MD direction, Fix in a folded state.
- the welded portion remains as an end seal portion jes on the exterior sheet 7a.
- the formation target position of this end seal part jes appears in the MD direction at the 2nd pitch P2 since the exterior sheet 7a exists in a 2nd expansion
- the end seal portion je is formed by the heat seal processing device 61.
- the heat seal processing device 61 includes a pair of upper and lower rolls 61u and 61d that are driven and rotated around a rotation axis along the CD direction with their outer peripheral surfaces facing each other.
- the upper roll 61u has a convex seal pattern portion 61sp heated on the outer peripheral surface
- the lower roll 61d has a smooth outer peripheral surface to receive the seal pattern portion 61sp.
- the seal pattern portion 61sp protrudes from the outer peripheral surface of the upper roll 61u in a shape corresponding to the end seal portion jes.
- the drive source of the drive rotation of the upper and lower rolls 61u, 61d is a servo motor (not shown). Further, only one seal pattern portion 61sp is provided on the outer peripheral surface of the upper roll 61u. Therefore, every time the exterior sheet 7a passes through the heat seal processing device 61 by the length of the second pitch P2, the upper roll 61u rotates once, thereby forming the end seal portion je at the second pitch P2. As a result, end seal portions je are formed on the exterior sheet 7a at a pitch corresponding to the length of one diaper 1 in the second extended state.
- Dividing processing unit 70 Even in the next division processing unit 70, the exterior sheet 7a is maintained in the second extended state. Therefore, the exterior sheet 7a fixed in the folded state is divided at the second pitch P2, and thereby the downstream end is separated from the exterior sheet 7a at the second pitch P2, and the diaper 1 is generated.
- the dividing process of the exterior sheet 7 a is performed by the rotary cutter device 71.
- the rotary cutter device 71 has a pair of upper and lower rolls 71u and 71d that are driven and rotated around a rotation axis along the CD direction with their outer peripheral surfaces facing each other.
- the upper roll 71u is a cutter roll 71u having a cutter blade 71c on the outer peripheral surface
- the lower roll 71d is an anvil roll 71d that receives the cutter blade 71c on a smooth outer peripheral surface.
- the cutter blade 71c is, for example, a flat blade extending along the CD direction, and protrudes from the outer peripheral surface of the cutter roll 71u.
- the exterior sheet 7a fixed in a folded state through the roll gap between the upper and lower rolls 71u, 71d passes, the exterior sheet 7a is divided at the position of the end seal portion jes. The downstream end portion of the exterior sheet 7 a is cut off, and the cut down downstream end portion becomes the diaper 1.
- the drive source of the drive rotation of the upper and lower rolls 71u, 71d is a servo motor (not shown). Further, only one cutter blade 71c is provided on the outer peripheral surface of the upper roll 71u. Furthermore, the exterior sheet 7a is conveyed in the second extended state. Therefore, each time the exterior sheet 7a passes through the rotary cutter device 71 by the length of the second pitch P2, the upper roll 71u and the lower roll 71d each rotate one time, whereby one diaper 1 is formed from the exterior sheet 7a. It is generated only by being divided. Then, each generated diaper 1 is sent downstream in the MD direction by an appropriate transport mechanism CV such as a belt conveyor.
- an appropriate transport mechanism CV such as a belt conveyor.
- the exterior sheet generation processing unit 10 of the production line LM of the diaper 1 has the corrugated roll mechanism 13.
- the corrugated roll mechanism 13 forms the first portion 9a1 and the second portion 9a2 on the low-extension sheet 9a, the sheet 9a is not taken up, and the joining device of the processing unit 10 is used as it is.
- the present invention is not limited to this. That is, instead of the corrugated roll mechanism 13 provided in the diaper 1 production line LM, the mechanism 13 may be provided in another production line (not shown). In this case, the first portion 9a1 and the second portion 9a2 are formed on the low-extensible sheet 9a by the corrugated roll mechanism 13 of the other production line.
- the sheet roll is moved from the storage location to the production line LM of the diaper 1 and attached to an appropriate feeding device (not shown) provided in the exterior sheet generation processing unit 10 of the production line LM. Then, the low elongation sheet 9a is fed out from the sheet roll (corresponding to “preparing”), whereby the low elongation sheet 9a in which the first portion 9a1 and the second portion 9a2 are formed is removed from the processing unit 10 This is supplied to the joining device 15.
- the corrugated roll mechanism 13 is provided in the exterior sheet generation processing unit 10 as in the above-described embodiment.
- the horn 17h itself of the ultrasonic welding device 17 is configured to be non-rotating, and the vibration surface 17hs is a flat surface, but this is not a limitation.
- the horn 17h may also have a roller configuration similar to the anvil roller 17a.
- the horn 17h may be configured as a roller (hereinafter referred to as a horn roller, not shown) that can rotate around a rotation axis along the CD direction, and its outer peripheral surface may function as a vibration surface.
- the vibration surface as the outer peripheral surface of the horn roller vibrates in a direction approaching and separating from the outer peripheral surface of the anvil roller 17a.
- the above-mentioned several protrusion 17at, 17at ... is provided in the outer peripheral surface of at least one roller of the horn roller or the anvil roller 17a by the arrangement pattern corresponding to the above-mentioned joining pattern.
- the joining of the stretchable sheet 8 a and the low stretchable sheet 9 a performed by the exterior sheet generation processing unit 10 is performed by the ultrasonic welding device 17.
- a heat seal processing device or a pressure processing device may be used instead of the ultrasonic welding device 17.
- the configuration of the heat seal processing apparatus and the configuration of the crimping processing apparatus are similar to each other. That is, the difference in configuration between the two is mainly in the presence or absence of heating of the roll, and both apparatuses have a pair of upper and lower rolls 19u and 19d that are driven and rotated around the rotation axis along the CD direction.
- the rolls 19u and 19d are each configured to rotate at a peripheral speed value equal to the peripheral speed value V17a of the anvil roller 17a in the case of the ultrasonic welding device 17 described above. Further, a plurality of protrusions (not shown) are arranged on the outer peripheral surface of at least one of the upper and lower rolls 19u and 19d in an arrangement pattern corresponding to the above-described bonding pattern. Therefore, according to such a configuration, the roll gap between the rolls 19u and 19d is low stretched in which the stretchable sheet 8a stretched to the first stretched state and the first portion 9a1 and the second portion 9a2 are formed.
- the sheet 9a passes in a state where the sheet 9a is superposed on each other, but at the time of the passage, the two sheets 8a, 9a are clamped by the respective protrusions by the rolls 19u, 19d.
- the staggered pattern is exemplified as the joining pattern for joining the stretchable sheet 8a and the low-extensible sheet 9a, but the invention is not limited to this.
- it may be a lattice pattern in which joints j, j... Are formed at each intersection of lattices, or a pattern other than this may be used.
- the stretchable direction of the stretchable sheet 8a is aligned with the MD direction
- the first portions 9a1 and the second portions 9a2 are alternately formed in the MD direction on the low stretchable sheet 9a.
- the joint portion is so arranged that at least one central position C9a1 of the first portion 9a1 and at least one central position C9a2 of the second portion 9a2 are included in the non-joint portion jn between the joint portions j, j adjacent in the MD direction.
- j is formed and thereby, when the shrinkage in the MD direction occurs, the wrinkles are surely formed in the non-joined portion jn, but this is not restrictive. For example, the following may be performed.
- the sheet 8a ′ is conveyed in the MD direction while keeping the expansion / contraction direction of the elastic sheet 8a ′ in the CD direction.
- the sheet 9a ′ is conveyed in the CD direction.
- the low-extensible sheet 9a ′ is also conveyed in the MD direction, and on the sheet 9a ′, the first part 9a1 ′ extended in the CD direction and the second part not extended more than the first part 9a1 ′.
- the portions 9a1 ′ and 9a2 ′ are formed so that the portions 9a2 ′ are alternately arranged in the CD direction.
- seat 9a in which the said 1st part 9a1 'and 2nd part 9a2' were formed is joined to the elastic sheet
- the center position C9a1 ′ of the first part 9a1 ′ and the center position of the second part 9a2 ′ are in the non-joining part jn ′ between the joining parts j ′ and j ′ adjacent in the CD direction.
- the junction j ′ is formed so as to include at least one C9a2 ′.
- the junctions j ′, j ′,... are formed in a lattice pattern, but the present invention is not limited to this, and may be formed in the above-described staggered pattern.
- a roll mechanism 13 ′ as shown in FIGS. 11A and 11B can be exemplified.
- . 11A is a schematic front view of the roll mechanism 13 ′ viewed from the downstream side in the MD direction
- FIG. 11B is a view taken along the line BB in FIG. 11A.
- the roll mechanism 13 ′ has a pair of upper and lower rolls 13u ′ and 13d ′ that rotate about a rotation axis along the CD direction.
- the upper roll 13u ′ has a large diameter portion 13m ′ and a small diameter portion 13v ′ alternately in the CD direction.
- the lower roll 13d ′ also has a large diameter portion 13m ′ and a small diameter portion 13v ′ in the CD direction.
- These rolls 13u ′ and 13d ′ are arranged one above the other while inserting their own large diameter portion 13m ′ in the space near the counterpart small diameter portion 13v ′, thereby rotating the rolls 13u ′ and 13d ′.
- the large diameter portions 13m 'and 13m' are meshed with each other in the direction Ab.
- the low extensible sheet 9a is passed along the MD direction between the rolls 13u ′ and 13d ′.
- the low-extensible sheet 9a that is passing is between the large-diameter portions 13m ′ and 13m ′ adjacent to each other in the one roll 13u ′ (13d ′) and between the large-diameter portions 13m ′ and 13m ′. It is deformed into a three-point bend by the large diameter portion 13m ′ of the other roll 13d ′ (13u ′) entering the small diameter portion 13v ′. At this time, the portion 9a2 ′ that comes into contact with the top surface of the large-diameter portion 13m ′ of one roll 13u ′ (13d ′) in the low-extension sheet 9a ′ is in contact with the top surface so as to be relatively unmovable.
- the second portion 9a2 ′ is substantially unstretched, and the portion 9a2 is in contact with the top surface of the large-diameter portion 13m ′ of the other roll 13d ′ (13u ′) in the sheet 9a ′.
- 'Also comes into contact with the top surface so as not to be relatively movable, and thereby becomes the above-described second portion 9a2' without being generally stretched.
- the portion 9a1 ′ between the two second portions 9a2 ′ and 9a2 ′ is stretched based on the entry of the large-diameter portion 13m ′, whereby the portion 9a1 ′ 1 portion 9a1 ′.
- 1st part 9a1 'and 2nd part 9a2' are alternately formed in CD direction in low extensible sheet
- the peak portion 13m of the corrugated roll 13u is cut out at a predetermined position Pk in the CD direction, as shown in FIG. 7, for the purpose of suppressing the development of stretchability of the low-extension sheet 9a.
- a configuration similar to this may be applied to the roll mechanism 13 ′ of FIGS. 11A and 11B. That is, as shown in FIG.
- each large-diameter portion 13m ′ of at least one roll 13u ′ of the pair of rolls 13u ′ and 13d ′ is cut out at a predetermined position Pk ′ in the rotation direction, thereby
- the portion 13m ′ may be provided discontinuously.
- the large-diameter portion 13m ′ does not exist at the predetermined position Pk ′, the above-described three-point bending-shaped stretching process is not performed at the position Pk ′, and thus at least the position Pk.
- the expression of elasticity is suppressed.
- the expression of stretchability in the CD direction of the low stretch sheet 9a ′ is suppressed as a whole.
- the widening device has a pair of rollers provided corresponding to each end of the stretchable sheet 8a in the CD direction, and each roller abuts its outer peripheral surface against the stretchable sheet 8a.
- the sheet 8a is driven to rotate so as to be sent to the downstream side in the MD direction.
- the rotation direction of each roller is slightly outward in the CD direction from the direction along the MD direction. Therefore, when passing the position of each roller, the sheet 8a is pulled to both sides in the CD direction by each roller, and thereby the sheet 8a is extended to both sides in the CD direction.
- the exterior sheet contraction processing unit 30 has the pair of nip roll mechanisms 31 and 33 as the mechanism for contracting the first expanded exterior sheet 7 a.
- the mechanism is not limited to this as long as the mechanism can contract the sheet 7a.
- a pair of S hanging roll mechanisms 31 'and 33' as shown in FIG. 12 may be provided instead of the pair of nip roll mechanisms 31 and 33. That is, each S-hanging roll mechanism 31 ′ (33 ′) is a pair of rolls 31u ′ and 31u ′ (33u ′ and 33d ′) that are driven and rotated around the rotation axis along the CD direction with their outer peripheral surfaces facing each other.
- the exterior sheet 7a is hung around the pair of rolls 31u ′, 31d ′ (33u ′, 33d ′) in an S shape. Therefore, according to such a configuration, the outer sheet 7a can be held on the outer peripheral surface of each roll 31u ′, 31d ′ (33u ′, 33d ′) with almost no relative slip, and these rolls 31u ′, 31d ′ (33u) can be held. Based on the drive rotation of ', 33d'), the sheet 7a can be transported using the peripheral speed values of the rolls 31u ', 31d' (33u ', 33d') as the transport speed value of the exterior sheet 7a.
- the S hanging roll mechanisms 31 ′ and 33 ′ can be used in place of the nip roll mechanisms 31 and 33 described above.
- both of the pair of nip roll mechanisms 31 and 33 are replaced with S hanging roll mechanisms 31 ′ and 33 ′, respectively, but depending on the case, only one of the nip roll mechanisms 31 (33) is used. May be replaced with the S hanging roll mechanism 31 (33).
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Abstract
A production method for a composite sheet that is for an absorbent article and that includes an elastic sheet and a low-stretchability sheet that has lower stretchability than the elastic sheet. The method includes: preparing a low-stretchability sheet that is formed by mutually aligning in a prescribed direction a first section that is extended in the prescribed direction and a second section that is not extended as far as the first section; and fixing the elastic sheet to the low-stretchability sheet via a plurality of joined parts while the elastic sheet is stretched in an elastic direction, the elastic direction being arranged in the prescribed direction. With regard to the fixing, the plurality of joined parts are provided so as to be discontinuously distributed in both the elastic direction and a direction that intersects the elastic direction, and are provided such that at least one of each of a prescribed-direction central position of the first section and a prescribed-direction central position of the second section is included in an un-joined part that is positioned between joined parts that, from among the plurality of joined parts, are adjacent in the elastic direction.
Description
本発明は、使い捨ておむつ等の吸収性物品に係る複合シートの製造方法、及び製造装置に関する。
The present invention relates to a method for manufacturing a composite sheet and an apparatus for manufacturing an absorbent article such as a disposable diaper.
吸収性物品の一例としての使い捨ておむつの製造ラインでは、搬送方向に所定の伸長倍率の伸長状態で搬送される伸縮性シートに低伸長性シートを重ね合わせて固定することによって複合シートを生成することが行われている。そして、かかる複合シートにあっては、通常、上記の伸長状態が維持されながら下工程へと搬送され、当該下工程では、かかる伸長状態の複合シートに対して、液体を吸収する吸収性本体を取り付ける等の適宜な加工処理が順次行われて、最後に製品たるおむつの単位に分断されて同おむつが製造される。
In a disposable diaper production line as an example of an absorbent article, a composite sheet is generated by stacking and fixing a low stretch sheet on a stretch sheet that is transported in a stretched state at a predetermined stretch ratio in the transport direction. Has been done. And in such a composite sheet, it is normally conveyed to the lower process while maintaining the above-mentioned stretched state, and in the lower process, an absorbent main body that absorbs liquid is applied to the stretched composite sheet. Appropriate processing such as attachment is sequentially performed, and finally the product is divided into diaper units to produce the diaper.
ここで、かかる分断処理に伴って、複合シートの伸長が解除されて搬送方向に収縮すると、当該複合シートを主材とするおむつの外装部には、搬送方向と交差する方向に沿った複数の皺が寄る。そして、これにより、製造されたおむつは、少なくとも当該皺が伸びきるまで伸長可能に収縮した形態となって市場に提供される。その結果、着用者等のユーザーは、伸び縮み可能な仕様のおむつを使用できる。
Here, when the elongation of the composite sheet is released and contracted in the transport direction along with the dividing process, a plurality of diaper exterior parts having the composite sheet as a main material in a direction intersecting the transport direction A habit of approaching. Thus, the manufactured diaper is provided to the market in a contracted form so that it can be extended at least until the heel is fully extended. As a result, a user such as a wearer can use a diaper having specifications that can be expanded and contracted.
ここで、かかる皺は、人目につく部分に形成されている。そのため、当該皺が綺麗に寄っていれば、おむつの見栄えが良くなって購買者への訴求力を高めることができる。
皺 Here, such ridges are formed in a conspicuous part. For this reason, if the bag is clean, the appearance of the diaper is improved and the appeal to the purchaser can be enhanced.
本発明は、上記のような従来の問題に鑑みてなされたものであって、その目的は、吸収性物品に係る複合シートに綺麗な皺を形成することにある。
The present invention has been made in view of the above-described conventional problems, and an object thereof is to form a beautiful wrinkle on a composite sheet according to an absorbent article.
上記目的を達成するための主たる発明は、
吸収性物品に係る伸縮性シートと、前記伸縮性シートよりも伸長性の低い低伸長性シートとを有した複合シートの製造方法であって、
所定方向に延伸された第1部分と、前記第1部分よりも延伸されていない第2部分とが前記所定方向に関して交互に並ぶように形成された前記低伸長性シートを準備することと、
前記伸縮性シートを伸縮方向に伸長した状態で、前記伸縮方向を前記所定方向に揃えつつ前記低伸長性シートに前記伸縮性シートを複数の接合部を介して固定することと、を有し、
前記固定することにおいては、前記複数の接合部を、前記伸縮方向及び前記伸縮方向と交差する方向の両方向について非連続に分散して設けるとともに、前記複数の接合部のうちで前記伸縮方向に隣り合う接合部同士の間に位置する非接合部に、前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ少なくとも一つずつ含まれるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造方法である。
また、
吸収性物品に係る伸縮性シートと、前記伸縮性シートよりも伸長性の低い低伸長性シートとを有した複合シートの製造装置であって、
所定方向に延伸された第1部分と、前記第1部分よりも延伸されていない第2部分とが前記所定方向に関して交互に並ぶように形成された前記低伸長性シートを準備する装置と、
前記伸縮性シートを伸縮方向に伸長した状態で、前記伸縮方向を前記所定方向に揃えつつ前記低伸長性シートに前記伸縮性シートを複数の接合部を介して固定する装置と、を有し、
前記固定する装置では、前記複数の接合部を、前記伸縮方向及び前記伸縮方向と交差する方向の両方向について非連続に分散して設けるとともに、前記複数の接合部のうちで前記伸縮方向に隣り合う接合部同士の間に位置する非接合部に、前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ少なくとも一つずつ含まれるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造装置である。
本発明の他の特徴については、本明細書及び添付図面の記載により明らかにする。 The main invention for achieving the above object is:
A method for producing a composite sheet having an elastic sheet according to an absorbent article and a low-extensible sheet having a lower extensibility than the elastic sheet,
Preparing the low stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction;
Fixing the stretchable sheet to the low stretchable sheet through a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet extended in the stretchable direction,
In the fixing, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and adjacent to the stretch direction among the plurality of joint portions. The non-joint portion located between the mating joint portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. It is a manufacturing method of the composite sheet concerning an absorptive article characterized by providing the above-mentioned joined part.
Also,
An apparatus for producing a composite sheet having a stretchable sheet according to an absorbent article and a low stretchable sheet having a lower stretchability than the stretchable sheet,
An apparatus for preparing the low-stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction;
An apparatus for fixing the stretchable sheet to the low stretchable sheet via a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet stretched in the stretchable direction;
In the fixing device, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and are adjacent to the stretch direction among the plurality of joint portions. The non-joining portion located between the joining portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. An apparatus for manufacturing a composite sheet according to an absorbent article, wherein a bonding portion is provided.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.
吸収性物品に係る伸縮性シートと、前記伸縮性シートよりも伸長性の低い低伸長性シートとを有した複合シートの製造方法であって、
所定方向に延伸された第1部分と、前記第1部分よりも延伸されていない第2部分とが前記所定方向に関して交互に並ぶように形成された前記低伸長性シートを準備することと、
前記伸縮性シートを伸縮方向に伸長した状態で、前記伸縮方向を前記所定方向に揃えつつ前記低伸長性シートに前記伸縮性シートを複数の接合部を介して固定することと、を有し、
前記固定することにおいては、前記複数の接合部を、前記伸縮方向及び前記伸縮方向と交差する方向の両方向について非連続に分散して設けるとともに、前記複数の接合部のうちで前記伸縮方向に隣り合う接合部同士の間に位置する非接合部に、前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ少なくとも一つずつ含まれるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造方法である。
また、
吸収性物品に係る伸縮性シートと、前記伸縮性シートよりも伸長性の低い低伸長性シートとを有した複合シートの製造装置であって、
所定方向に延伸された第1部分と、前記第1部分よりも延伸されていない第2部分とが前記所定方向に関して交互に並ぶように形成された前記低伸長性シートを準備する装置と、
前記伸縮性シートを伸縮方向に伸長した状態で、前記伸縮方向を前記所定方向に揃えつつ前記低伸長性シートに前記伸縮性シートを複数の接合部を介して固定する装置と、を有し、
前記固定する装置では、前記複数の接合部を、前記伸縮方向及び前記伸縮方向と交差する方向の両方向について非連続に分散して設けるとともに、前記複数の接合部のうちで前記伸縮方向に隣り合う接合部同士の間に位置する非接合部に、前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ少なくとも一つずつ含まれるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造装置である。
本発明の他の特徴については、本明細書及び添付図面の記載により明らかにする。 The main invention for achieving the above object is:
A method for producing a composite sheet having an elastic sheet according to an absorbent article and a low-extensible sheet having a lower extensibility than the elastic sheet,
Preparing the low stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction;
Fixing the stretchable sheet to the low stretchable sheet through a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet extended in the stretchable direction,
In the fixing, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and adjacent to the stretch direction among the plurality of joint portions. The non-joint portion located between the mating joint portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. It is a manufacturing method of the composite sheet concerning an absorptive article characterized by providing the above-mentioned joined part.
Also,
An apparatus for producing a composite sheet having a stretchable sheet according to an absorbent article and a low stretchable sheet having a lower stretchability than the stretchable sheet,
An apparatus for preparing the low-stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction;
An apparatus for fixing the stretchable sheet to the low stretchable sheet via a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet stretched in the stretchable direction;
In the fixing device, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and are adjacent to the stretch direction among the plurality of joint portions. The non-joining portion located between the joining portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. An apparatus for manufacturing a composite sheet according to an absorbent article, wherein a bonding portion is provided.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.
本発明によれば、吸収性物品に係る複合シートに綺麗な皺を形成可能となる。
According to the present invention, it is possible to form beautiful wrinkles on the composite sheet relating to the absorbent article.
本明細書及び添付図面の記載により、少なくとも以下の事項が明らかとなる。
吸収性物品に係る伸縮性シートと、前記伸縮性シートよりも伸長性の低い低伸長性シートとを有した複合シートの製造方法であって、
所定方向に延伸された第1部分と、前記第1部分よりも延伸されていない第2部分とが前記所定方向に関して交互に並ぶように形成された前記低伸長性シートを準備することと、
前記伸縮性シートを伸縮方向に伸長した状態で、前記伸縮方向を前記所定方向に揃えつつ前記低伸長性シートに前記伸縮性シートを複数の接合部を介して固定することと、を有し、
前記固定することにおいては、前記複数の接合部を、前記伸縮方向及び前記伸縮方向と交差する方向の両方向について非連続に分散して設けるとともに、前記複数の接合部のうちで前記伸縮方向に隣り合う接合部同士の間に位置する非接合部に、前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ少なくとも一つずつ含まれるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造方法である。 At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
A method for producing a composite sheet having an elastic sheet according to an absorbent article and a low-extensible sheet having a lower extensibility than the elastic sheet,
Preparing the low stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction;
Fixing the stretchable sheet to the low stretchable sheet through a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet extended in the stretchable direction,
In the fixing, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and adjacent to the stretch direction among the plurality of joint portions. The non-joint portion located between the mating joint portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. It is a manufacturing method of the composite sheet concerning an absorptive article characterized by providing the above-mentioned joined part.
吸収性物品に係る伸縮性シートと、前記伸縮性シートよりも伸長性の低い低伸長性シートとを有した複合シートの製造方法であって、
所定方向に延伸された第1部分と、前記第1部分よりも延伸されていない第2部分とが前記所定方向に関して交互に並ぶように形成された前記低伸長性シートを準備することと、
前記伸縮性シートを伸縮方向に伸長した状態で、前記伸縮方向を前記所定方向に揃えつつ前記低伸長性シートに前記伸縮性シートを複数の接合部を介して固定することと、を有し、
前記固定することにおいては、前記複数の接合部を、前記伸縮方向及び前記伸縮方向と交差する方向の両方向について非連続に分散して設けるとともに、前記複数の接合部のうちで前記伸縮方向に隣り合う接合部同士の間に位置する非接合部に、前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ少なくとも一つずつ含まれるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造方法である。 At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
A method for producing a composite sheet having an elastic sheet according to an absorbent article and a low-extensible sheet having a lower extensibility than the elastic sheet,
Preparing the low stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction;
Fixing the stretchable sheet to the low stretchable sheet through a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet extended in the stretchable direction,
In the fixing, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and adjacent to the stretch direction among the plurality of joint portions. The non-joint portion located between the mating joint portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. It is a manufacturing method of the composite sheet concerning an absorptive article characterized by providing the above-mentioned joined part.
このような吸収性物品に係る複合シートの製造方法によれば、複合シートに綺麗な皺を形成することができる。詳しくは次の通りである。
先ず、上記の準備することにおいては、上記の第1部分と第2部分とを有した低伸長性シートを準備するが、同シートは、当該第1部分の延伸量と第2部分の延伸量との差に基づいて剛性差がついている。そのため、かかる剛性差に基づいて低伸長性シートは上記所定方向に座屈し易くなっている。
一方、上記の固定することにおいては、当該低伸長性シートに対して伸長した状態の伸縮性シートを固定するが、かかる固定後に、当該伸長した状態が解除されると、伸縮性シートは伸縮方向たる上記所定方向に収縮する。すると、両シートの接合部を介して伸縮性シートから低伸長性シートへと上記所定方向の収縮力が付与されるが、かかる収縮力は、上記所定方向に沿って圧縮の外力として低伸長性シートに作用する。そのため、当該低伸長性シートは、上記の剛性差に基づいて座屈して皺が寄る。
ここで、上述のように、かかる剛性差は、第1部分と第2部分との両者に基づいて生じているが、かかる第1部分の中央位置と第2部分の中央位置とは、それぞれ少なくとも一つずつ上記の非接合部に含まれている。よって、かかる剛性差に基づいて、低伸長性シートにおける非接合部は、速やかに座屈し得て、その結果、当該非接合部には速やかに皺が寄るようになる。そして、以上から、複合シートに綺麗な皺を形成することができる。 According to the method for producing a composite sheet relating to such an absorbent article, it is possible to form beautiful wrinkles on the composite sheet. Details are as follows.
First, in the above preparation, a low-extensible sheet having the first part and the second part is prepared. The sheet has an extension amount of the first part and an extension amount of the second part. There is a difference in rigidity based on the difference. For this reason, the low stretch sheet is likely to buckle in the predetermined direction based on the rigidity difference.
On the other hand, in the above-described fixing, the stretchable sheet in a stretched state is fixed to the low stretchable sheet. However, when the stretched state is released after the fixing, the stretchable sheet is stretched in the stretchable direction. Shrink in the predetermined direction. Then, the contractive force in the predetermined direction is applied from the stretchable sheet to the low-extensible sheet via the joint portion of both sheets, and the contractive force is low extensibility as an external force of compression along the predetermined direction. Acts on the sheet. Therefore, the low-extensible sheet buckles based on the above-described rigidity difference and becomes wrinkled.
Here, as described above, the difference in rigidity is generated based on both the first portion and the second portion. However, the central position of the first portion and the central position of the second portion are at least One by one is included in the non-joined part. Therefore, based on this rigidity difference, the non-joined portion in the low-extensible sheet can be quickly buckled, and as a result, the non-joined portion is quickly wrinkled. From the above, it is possible to form beautiful wrinkles on the composite sheet.
先ず、上記の準備することにおいては、上記の第1部分と第2部分とを有した低伸長性シートを準備するが、同シートは、当該第1部分の延伸量と第2部分の延伸量との差に基づいて剛性差がついている。そのため、かかる剛性差に基づいて低伸長性シートは上記所定方向に座屈し易くなっている。
一方、上記の固定することにおいては、当該低伸長性シートに対して伸長した状態の伸縮性シートを固定するが、かかる固定後に、当該伸長した状態が解除されると、伸縮性シートは伸縮方向たる上記所定方向に収縮する。すると、両シートの接合部を介して伸縮性シートから低伸長性シートへと上記所定方向の収縮力が付与されるが、かかる収縮力は、上記所定方向に沿って圧縮の外力として低伸長性シートに作用する。そのため、当該低伸長性シートは、上記の剛性差に基づいて座屈して皺が寄る。
ここで、上述のように、かかる剛性差は、第1部分と第2部分との両者に基づいて生じているが、かかる第1部分の中央位置と第2部分の中央位置とは、それぞれ少なくとも一つずつ上記の非接合部に含まれている。よって、かかる剛性差に基づいて、低伸長性シートにおける非接合部は、速やかに座屈し得て、その結果、当該非接合部には速やかに皺が寄るようになる。そして、以上から、複合シートに綺麗な皺を形成することができる。 According to the method for producing a composite sheet relating to such an absorbent article, it is possible to form beautiful wrinkles on the composite sheet. Details are as follows.
First, in the above preparation, a low-extensible sheet having the first part and the second part is prepared. The sheet has an extension amount of the first part and an extension amount of the second part. There is a difference in rigidity based on the difference. For this reason, the low stretch sheet is likely to buckle in the predetermined direction based on the rigidity difference.
On the other hand, in the above-described fixing, the stretchable sheet in a stretched state is fixed to the low stretchable sheet. However, when the stretched state is released after the fixing, the stretchable sheet is stretched in the stretchable direction. Shrink in the predetermined direction. Then, the contractive force in the predetermined direction is applied from the stretchable sheet to the low-extensible sheet via the joint portion of both sheets, and the contractive force is low extensibility as an external force of compression along the predetermined direction. Acts on the sheet. Therefore, the low-extensible sheet buckles based on the above-described rigidity difference and becomes wrinkled.
Here, as described above, the difference in rigidity is generated based on both the first portion and the second portion. However, the central position of the first portion and the central position of the second portion are at least One by one is included in the non-joined part. Therefore, based on this rigidity difference, the non-joined portion in the low-extensible sheet can be quickly buckled, and as a result, the non-joined portion is quickly wrinkled. From the above, it is possible to form beautiful wrinkles on the composite sheet.
かかる吸収性物品に係る複合シートの製造方法であって、
前記準備することにおいては、複数の前記第2部分が、前記所定方向に沿って所定の形成ピッチで並ぶように形成された前記低伸長性シートを準備し、
前記固定することにおいては、前記形成ピッチよりも、前記非接合部の前記伸縮方向の長さの方が大きくなるように、前記接合部を設けるのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
In the preparation, preparing the low-extensible sheet formed such that a plurality of the second portions are arranged at a predetermined formation pitch along the predetermined direction,
In the fixing, it is desirable to provide the joining portion so that the length of the non-joining portion in the expansion / contraction direction is larger than the formation pitch.
前記準備することにおいては、複数の前記第2部分が、前記所定方向に沿って所定の形成ピッチで並ぶように形成された前記低伸長性シートを準備し、
前記固定することにおいては、前記形成ピッチよりも、前記非接合部の前記伸縮方向の長さの方が大きくなるように、前記接合部を設けるのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
In the preparation, preparing the low-extensible sheet formed such that a plurality of the second portions are arranged at a predetermined formation pitch along the predetermined direction,
In the fixing, it is desirable to provide the joining portion so that the length of the non-joining portion in the expansion / contraction direction is larger than the formation pitch.
このような吸収性物品に係る複合シートの製造方法によれば、第2部分が所定方向に沿って並ぶ上記形成ピッチよりも、非接合部の長さの方が大きくなっている。よって、非接合部に、第1部分の中央位置と2部分の中央位置とをそれぞれ少なくともひとつずつ含ませることができて、これにより、低伸長性シートにおける非接合部には、速やかに皺が寄るようになる。
According to the method for manufacturing a composite sheet relating to such an absorbent article, the length of the non-joined portion is larger than the above-described formation pitch in which the second portions are arranged along the predetermined direction. Therefore, at least one of the center position of the first part and the center position of the two parts can be included in the non-joined part, whereby the non-joined part in the low-extensible sheet is quickly wrinkled. Come closer.
かかる吸収性物品に係る複合シートの製造方法であって、
前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ、複数個ずつ前記非接合部に含まれるように、前記接合部を設けるのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
It is preferable that the joint portion is provided so that a plurality of center positions in the predetermined direction of the first portion and a center position in the predetermined direction of the second portion are included in the non-joint portion.
前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ、複数個ずつ前記非接合部に含まれるように、前記接合部を設けるのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
It is preferable that the joint portion is provided so that a plurality of center positions in the predetermined direction of the first portion and a center position in the predetermined direction of the second portion are included in the non-joint portion.
このような吸収性物品に係る複合シートの製造方法によれば、非接合部には、第1部分の中央位置と第2部分の中央位置とがそれぞれ複数個ずつ含まれている。よって、かかる非接合部では、上記所定方向の複数の位置において剛性差が生じるので、低伸長性シートにおける非接合部は、複数の位置で速やかに座屈し得て、その結果、当該非接合部には、より多くの皺が寄るようになる。
According to the method for manufacturing a composite sheet relating to such an absorbent article, the non-joined portion includes a plurality of center positions of the first portion and a plurality of center positions of the second portion. Therefore, in such a non-joined portion, a difference in rigidity occurs at a plurality of positions in the predetermined direction. Therefore, the non-joined portion in the low stretch sheet can be buckled quickly at the plurality of positions, and as a result, the non-joined portion. There will be more traps.
かかる複合シートの製造方法であって、
前記準備することにおいては、複数の前記第2部分が、前記所定方向に沿って所定の形成ピッチで並ぶように形成された前記低伸長性シートを準備し、
前記固定することにおいては、前記形成ピッチの複数倍の大きさよりも、前記非接合部の前記伸縮方向の長さの方が大きくなるように、前記接合部を設けるのが望ましい。 A method for producing such a composite sheet,
In the preparation, preparing the low-extensible sheet formed such that a plurality of the second portions are arranged at a predetermined formation pitch along the predetermined direction,
In the fixing, it is desirable to provide the joining portion so that the length of the non-joining portion in the expansion / contraction direction is larger than the multiple of the formation pitch.
前記準備することにおいては、複数の前記第2部分が、前記所定方向に沿って所定の形成ピッチで並ぶように形成された前記低伸長性シートを準備し、
前記固定することにおいては、前記形成ピッチの複数倍の大きさよりも、前記非接合部の前記伸縮方向の長さの方が大きくなるように、前記接合部を設けるのが望ましい。 A method for producing such a composite sheet,
In the preparation, preparing the low-extensible sheet formed such that a plurality of the second portions are arranged at a predetermined formation pitch along the predetermined direction,
In the fixing, it is desirable to provide the joining portion so that the length of the non-joining portion in the expansion / contraction direction is larger than the multiple of the formation pitch.
このような吸収性物品に係る複合シートの製造方法によれば、上記の第2部分の形成ピッチの整数倍の大きさよりも、非接合部の長さの方が大きくされている。よって、非接合部に、第1部分の中央位置と第2部分の中央位置とを、それぞれ複数個ずつ含ませることができて、これにより、低伸長性シートにおける非接合部には、より多くの皺が寄るようになる。
According to the method of manufacturing a composite sheet relating to such an absorbent article, the length of the non-joined part is made larger than the integral multiple of the formation pitch of the second part. Therefore, the non-joining portion can include a plurality of the center positions of the first portion and the center portion of the second portion, respectively, so that more non-joining portions in the low stretch sheet can be included.皺 comes to approach.
かかる吸収性物品に係る複合シートの製造方法であって、
前記低伸長性シートは、前記所定方向に連続した連続シートであり、
前記準備することにおいては、前記所定方向を搬送方向として前記低伸長性シートを搬送するとともに、当該搬送中の前記低伸長性シートに前記第1部分と前記第2部分とを形成し、
前記第1部分と前記第2部分とが形成された前記低伸長性シートを、巻き取らずに、前記固定することを行う位置へ向けて搬送するのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
The low extensibility sheet is a continuous sheet continuous in the predetermined direction,
In the preparation, the low-extensible sheet is conveyed with the predetermined direction as the conveying direction, and the first and second portions are formed on the low-extensible sheet being conveyed,
It is desirable that the low-extensible sheet on which the first part and the second part are formed is conveyed toward a position where the fixing is performed without winding.
前記低伸長性シートは、前記所定方向に連続した連続シートであり、
前記準備することにおいては、前記所定方向を搬送方向として前記低伸長性シートを搬送するとともに、当該搬送中の前記低伸長性シートに前記第1部分と前記第2部分とを形成し、
前記第1部分と前記第2部分とが形成された前記低伸長性シートを、巻き取らずに、前記固定することを行う位置へ向けて搬送するのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
The low extensibility sheet is a continuous sheet continuous in the predetermined direction,
In the preparation, the low-extensible sheet is conveyed with the predetermined direction as the conveying direction, and the first and second portions are formed on the low-extensible sheet being conveyed,
It is desirable that the low-extensible sheet on which the first part and the second part are formed is conveyed toward a position where the fixing is performed without winding.
このような吸収性物品に係る複合シートの製造方法によれば、準備することにおいては、低伸長性シートに第1部分と第2部分とを形成する。よって、最初から第1部分と第2部分とを有さない仕様の低伸長性シートであっても、当該複合シートの材料として使用することができる。また、上記第1及び第2部分の形成後に低伸長性シートを巻き取らずに、同シートをそのまま、上記の固定することを行う位置へと搬送する。よって、上記第1及び第2部分の形成に伴って増加された低伸長性シートの嵩を、巻き取りによって潰してしまうことを有効に防ぐことができて、結果、低伸長性シートを、嵩高由来の柔らかさを具備したシートに仕上げることができる。
According to the method for manufacturing a composite sheet relating to such an absorbent article, the first part and the second part are formed on the low-extension sheet in preparation. Therefore, even a low-extensible sheet having specifications that do not have the first part and the second part from the beginning can be used as a material for the composite sheet. Further, after the first and second portions are formed, the low-extensible sheet is not taken up, and the sheet is conveyed as it is to the position where the fixing is performed. Therefore, it is possible to effectively prevent crushing the bulk of the low stretch sheet that has been increased with the formation of the first and second portions by winding, and as a result, the low stretch sheet is bulky. It can be finished into a sheet having a softness of origin.
かかる吸収性物品に係る複合シートの製造方法であって、
前記低伸長性シートは、前記所定方向に連続した連続シートであり、
前記伸縮性シートは、前記伸縮方向に連続した連続シートであり、
前記固定することにおいては、前記伸縮性シートは前記伸縮方向を搬送方向として搬送されており、
前記低伸長性シートが固定された前記伸縮性シートが、前記固定することの後で前記搬送方向の所定位置を通過する際に、前記伸縮性シートのうちで前記所定位置を通過する部分を順次前記伸縮方向に収縮させるのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
The low extensibility sheet is a continuous sheet continuous in the predetermined direction,
The stretchable sheet is a continuous sheet continuous in the stretch direction,
In the fixing, the stretchable sheet is transported with the stretch direction as the transport direction,
When the stretchable sheet to which the low stretchable sheet is fixed passes through the predetermined position in the transport direction after the fixing, the portions of the stretchable sheet that pass through the predetermined position are sequentially It is desirable to contract in the expansion / contraction direction.
前記低伸長性シートは、前記所定方向に連続した連続シートであり、
前記伸縮性シートは、前記伸縮方向に連続した連続シートであり、
前記固定することにおいては、前記伸縮性シートは前記伸縮方向を搬送方向として搬送されており、
前記低伸長性シートが固定された前記伸縮性シートが、前記固定することの後で前記搬送方向の所定位置を通過する際に、前記伸縮性シートのうちで前記所定位置を通過する部分を順次前記伸縮方向に収縮させるのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
The low extensibility sheet is a continuous sheet continuous in the predetermined direction,
The stretchable sheet is a continuous sheet continuous in the stretch direction,
In the fixing, the stretchable sheet is transported with the stretch direction as the transport direction,
When the stretchable sheet to which the low stretchable sheet is fixed passes through the predetermined position in the transport direction after the fixing, the portions of the stretchable sheet that pass through the predetermined position are sequentially It is desirable to contract in the expansion / contraction direction.
このような吸収性物品に係る複合シートの製造方法によれば、低伸長性シートが固定された伸縮性シートが、搬送方向の上記所定位置を通過する際に、伸縮性シートのうちで上記所定位置を通過する部分を順次伸縮方向に収縮させる。よって、低伸長性シートにおける第1部分及び第2部分が当該所定位置を通過する際には、同シートに順次皺が形成されていき、その結果、複合シートに整然とした皺を綺麗に形成することができる。
According to the method for manufacturing a composite sheet relating to such an absorbent article, when the elastic sheet to which the low-extensibility sheet is fixed passes through the predetermined position in the transport direction, the predetermined sheet of the elastic sheet is used. The portion passing through the position is contracted in the expansion / contraction direction sequentially. Therefore, when the first portion and the second portion of the low-extension sheet pass through the predetermined position, wrinkles are sequentially formed on the sheet, and as a result, neat wrinkles are formed neatly on the composite sheet. be able to.
かかる吸収性物品に係る複合シートの製造方法であって、
前記準備することにおいては、前記所定方向と交差する方向の所定位置に、前記所定方向に延伸されない部分が生じるようにしながら、前記低伸長性シートに前記上記第1部分と前記第2部分とを形成するのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
In the preparation, the first portion and the second portion are formed on the low stretch sheet while a portion that is not stretched in the predetermined direction is generated at a predetermined position in a direction intersecting the predetermined direction. It is desirable to form.
前記準備することにおいては、前記所定方向と交差する方向の所定位置に、前記所定方向に延伸されない部分が生じるようにしながら、前記低伸長性シートに前記上記第1部分と前記第2部分とを形成するのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
In the preparation, the first portion and the second portion are formed on the low stretch sheet while a portion that is not stretched in the predetermined direction is generated at a predetermined position in a direction intersecting the predetermined direction. It is desirable to form.
このような吸収性物品に係る複合シートの製造方法によれば、低伸長性シートに対して第1部分及び第2部分を所定方向に並んで形成する際に、同所定方向と交差する方向の所定位置には、同所定方向に延伸されない部分が生じるようにしている。そして、当該延伸されない部分には、伸縮性が発現しない。よって、低伸長性シートの伸縮性の発現を全体的に抑制しながら、同シートに上記の第1部分及び第2部分を形成することができる。
According to the method for manufacturing a composite sheet according to such an absorbent article, when forming the first portion and the second portion side by side in a predetermined direction with respect to the low-extension sheet, A portion that does not extend in the predetermined direction is formed at the predetermined position. And the stretchability does not express in the part which is not extended | stretched. Therefore, the first part and the second part can be formed on the sheet while suppressing the expression of stretchability of the low-extension sheet as a whole.
かかる吸収性物品に係る複合シートの製造方法であって、
前記低伸長性シートは、前記所定方向に連続した連続シートであり、
互いの外周面を対向させながら前記搬送方向に沿って回転する一対のロール同士の間に前記低伸長性シートを通すことによって前記第1部分と前記第2部分とを形成し、
前記一対のロールは、それぞれ、回転方向に沿って各外周面に山部と谷部とが交互に形成された波形ロールであるとともに、前記一対のロール同士は、互いの前記山部が前記谷部に入り込むように噛み合って回転し、
前記一対のロールのうちの少なくとも一方のロールの前記山部は、前記ロールの回転軸に沿う方向に非連続に設けられているのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
The low extensibility sheet is a continuous sheet continuous in the predetermined direction,
Forming the first part and the second part by passing the low extensible sheet between a pair of rolls rotating along the conveying direction while facing each other's outer peripheral surfaces;
The pair of rolls are corrugated rolls in which crests and troughs are alternately formed on each outer circumferential surface along the rotation direction, and the crests of the pair of rolls are such that the crests of each other are the troughs. Rotate by meshing to enter the part,
It is desirable that the peak portion of at least one of the pair of rolls is discontinuously provided in a direction along the rotation axis of the roll.
前記低伸長性シートは、前記所定方向に連続した連続シートであり、
互いの外周面を対向させながら前記搬送方向に沿って回転する一対のロール同士の間に前記低伸長性シートを通すことによって前記第1部分と前記第2部分とを形成し、
前記一対のロールは、それぞれ、回転方向に沿って各外周面に山部と谷部とが交互に形成された波形ロールであるとともに、前記一対のロール同士は、互いの前記山部が前記谷部に入り込むように噛み合って回転し、
前記一対のロールのうちの少なくとも一方のロールの前記山部は、前記ロールの回転軸に沿う方向に非連続に設けられているのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
The low extensibility sheet is a continuous sheet continuous in the predetermined direction,
Forming the first part and the second part by passing the low extensible sheet between a pair of rolls rotating along the conveying direction while facing each other's outer peripheral surfaces;
The pair of rolls are corrugated rolls in which crests and troughs are alternately formed on each outer circumferential surface along the rotation direction, and the crests of the pair of rolls are such that the crests of each other are the troughs. Rotate by meshing to enter the part,
It is desirable that the peak portion of at least one of the pair of rolls is discontinuously provided in a direction along the rotation axis of the roll.
このような吸収性物品に係る複合シートの製造方法によれば、所定方向に連続する低伸長性シートを一対のロール同士の間に通せば、第1部分及び第2部分を形成することができる。よって、当該低伸長性シートに対して第1部分及び第2部分を効率良く形成することができる。
また、一対のロールのうちの少なくとも一方のロールの山部において非連続となっている部分では、低伸長性シートを確実に延伸しないようになる。よって、当該部分には、上記の延伸されない部分が確実に生じるようになって、その結果、第1部分及び第2部分を形成する際に起こり得る低伸長性シートの伸縮性の発現を確実に抑制可能となる。 According to the method for manufacturing a composite sheet relating to such an absorbent article, the first portion and the second portion can be formed by passing a low stretch sheet continuous in a predetermined direction between a pair of rolls. . Therefore, a 1st part and a 2nd part can be efficiently formed with respect to the said low extensible sheet | seat.
Moreover, in the part which has become discontinuous in the peak part of the roll of at least one of a pair of rolls, a low extensible sheet | seat will not be extended | stretched reliably. Therefore, the portion that is not stretched is surely generated in the portion, and as a result, the stretchability of the low stretch sheet that can occur when forming the first portion and the second portion is ensured. It becomes possible to suppress.
また、一対のロールのうちの少なくとも一方のロールの山部において非連続となっている部分では、低伸長性シートを確実に延伸しないようになる。よって、当該部分には、上記の延伸されない部分が確実に生じるようになって、その結果、第1部分及び第2部分を形成する際に起こり得る低伸長性シートの伸縮性の発現を確実に抑制可能となる。 According to the method for manufacturing a composite sheet relating to such an absorbent article, the first portion and the second portion can be formed by passing a low stretch sheet continuous in a predetermined direction between a pair of rolls. . Therefore, a 1st part and a 2nd part can be efficiently formed with respect to the said low extensible sheet | seat.
Moreover, in the part which has become discontinuous in the peak part of the roll of at least one of a pair of rolls, a low extensible sheet | seat will not be extended | stretched reliably. Therefore, the portion that is not stretched is surely generated in the portion, and as a result, the stretchability of the low stretch sheet that can occur when forming the first portion and the second portion is ensured. It becomes possible to suppress.
かかる吸収性物品に係る複合シートの製造方法であって、
前記一対のロールのうちの他方のロールの前記山部は、前記ロールの回転軸に沿う方向に連続して設けられているのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
It is desirable that the peak portion of the other roll of the pair of rolls is provided continuously in a direction along the rotation axis of the roll.
前記一対のロールのうちの他方のロールの前記山部は、前記ロールの回転軸に沿う方向に連続して設けられているのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
It is desirable that the peak portion of the other roll of the pair of rolls is provided continuously in a direction along the rotation axis of the roll.
このような吸収性物品に係る複合シートの製造方法によれば、一対のロールのうちの他方のロールの山部には、当該山部が非連続になるような加工を施さなくて済む。よって、コスト削減を図れる。
According to the method of manufacturing a composite sheet relating to such an absorbent article, it is not necessary to perform processing such that the peak portion of the other roll of the pair of rolls is discontinuous. Thus, cost reduction can be achieved.
かかる吸収性物品に係る複合シートの製造方法であって、
前記固定することにおいては、前記伸縮性シートと前記低伸長性シートとを互いの厚さ方向に重ね合わせた状態で、前記伸縮性シートと前記低伸長性シートとを厚さ方向から一対の挟圧部材によって挟圧することにより、前記接合部を形成し、
前記一対の挟圧部材のうちの一方の挟圧部材は、前記低伸長性シートと対向する面に、複数の突部を前記複数の接合部が形成されるパターンで有し、他方の挟圧部材は、前記伸縮性シートと対向する面に、前記突部の頂面を受けるべく前記頂面よりも大きい面部を有するのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
In the fixing, the stretchable sheet and the low stretchable sheet are stacked in the thickness direction with the stretchable sheet and the low stretchable sheet overlapped with each other in the thickness direction. By sandwiching with a pressure member, the joint is formed,
One clamping member of the pair of clamping members has a plurality of protrusions in a pattern in which the plurality of joints are formed on a surface facing the low-extensible sheet, and the other clamping pressure It is desirable that the member has a surface portion that is larger than the top surface so as to receive the top surface of the protrusion on the surface facing the stretchable sheet.
前記固定することにおいては、前記伸縮性シートと前記低伸長性シートとを互いの厚さ方向に重ね合わせた状態で、前記伸縮性シートと前記低伸長性シートとを厚さ方向から一対の挟圧部材によって挟圧することにより、前記接合部を形成し、
前記一対の挟圧部材のうちの一方の挟圧部材は、前記低伸長性シートと対向する面に、複数の突部を前記複数の接合部が形成されるパターンで有し、他方の挟圧部材は、前記伸縮性シートと対向する面に、前記突部の頂面を受けるべく前記頂面よりも大きい面部を有するのが望ましい。 A method for producing a composite sheet according to such an absorbent article,
In the fixing, the stretchable sheet and the low stretchable sheet are stacked in the thickness direction with the stretchable sheet and the low stretchable sheet overlapped with each other in the thickness direction. By sandwiching with a pressure member, the joint is formed,
One clamping member of the pair of clamping members has a plurality of protrusions in a pattern in which the plurality of joints are formed on a surface facing the low-extensible sheet, and the other clamping pressure It is desirable that the member has a surface portion that is larger than the top surface so as to receive the top surface of the protrusion on the surface facing the stretchable sheet.
このような吸収性物品に係る複合シートの製造方法によれば、突部は伸長性シートに対向して設けられており、これにより、突部は低伸長性シートを介して伸縮性シートを挟圧する。よって、突部の頂面によって伸縮性シートが局所的に薄く伸ばされてしまう事態は有効に抑制される。一方、突部側に位置する低伸長性シートの伸長性は、伸縮性シートよりも低くなっている。よって、突部の頂面によって低伸長性シートが局所的に薄く伸ばされてしまうことは、同シートの低い伸長性に基づいて有効に回避されて、これにより、突部の頂面に十分な量の低伸長性シートを残すことができる。そして、その結果、低伸長性シートと伸縮性シートとは高い接合強度で接合されるようになる。
According to the method for manufacturing a composite sheet relating to such an absorbent article, the protrusion is provided so as to face the extensible sheet, whereby the protrusion sandwiches the elastic sheet via the low extensible sheet. Press. Therefore, the situation where the elastic sheet is locally stretched thinly by the top surface of the protrusion is effectively suppressed. On the other hand, the extensibility of the low extensibility sheet located on the protrusion side is lower than that of the elastic sheet. Therefore, it is effectively avoided that the low extensible sheet is locally stretched thinly by the top surface of the protrusion, based on the low extensibility of the sheet. An amount of low stretch sheet can be left. As a result, the low-extensible sheet and the stretchable sheet are bonded with high bonding strength.
また、
吸収性物品に係る伸縮性シートと、前記伸縮性シートよりも伸長性の低い低伸長性シートとを有した複合シートの製造装置であって、
所定方向に延伸された第1部分と、前記第1部分よりも延伸されていない第2部分とが前記所定方向に関して交互に並ぶように形成された前記低伸長性シートを準備する装置と、
前記伸縮性シートを伸縮方向に伸長した状態で、前記伸縮方向を前記所定方向に揃えつつ前記低伸長性シートに前記伸縮性シートを複数の接合部を介して固定する装置と、を有し、
前記固定する装置では、前記複数の接合部を、前記伸縮方向及び前記伸縮方向と交差する方向の両方向について非連続に分散して設けるとともに、前記複数の接合部のうちで前記伸縮方向に隣り合う接合部同士の間に位置する非接合部に、前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ少なくとも一つずつ含まれるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造装置である。 Also,
An apparatus for producing a composite sheet having a stretchable sheet according to an absorbent article and a low stretchable sheet having a lower stretchability than the stretchable sheet,
An apparatus for preparing the low-stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction;
An apparatus for fixing the stretchable sheet to the low stretchable sheet via a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet stretched in the stretchable direction;
In the fixing device, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and are adjacent to the stretch direction among the plurality of joint portions. The non-joining portion located between the joining portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. An apparatus for manufacturing a composite sheet according to an absorbent article, wherein a bonding portion is provided.
吸収性物品に係る伸縮性シートと、前記伸縮性シートよりも伸長性の低い低伸長性シートとを有した複合シートの製造装置であって、
所定方向に延伸された第1部分と、前記第1部分よりも延伸されていない第2部分とが前記所定方向に関して交互に並ぶように形成された前記低伸長性シートを準備する装置と、
前記伸縮性シートを伸縮方向に伸長した状態で、前記伸縮方向を前記所定方向に揃えつつ前記低伸長性シートに前記伸縮性シートを複数の接合部を介して固定する装置と、を有し、
前記固定する装置では、前記複数の接合部を、前記伸縮方向及び前記伸縮方向と交差する方向の両方向について非連続に分散して設けるとともに、前記複数の接合部のうちで前記伸縮方向に隣り合う接合部同士の間に位置する非接合部に、前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ少なくとも一つずつ含まれるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造装置である。 Also,
An apparatus for producing a composite sheet having a stretchable sheet according to an absorbent article and a low stretchable sheet having a lower stretchability than the stretchable sheet,
An apparatus for preparing the low-stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction;
An apparatus for fixing the stretchable sheet to the low stretchable sheet via a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet stretched in the stretchable direction;
In the fixing device, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and are adjacent to the stretch direction among the plurality of joint portions. The non-joining portion located between the joining portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. An apparatus for manufacturing a composite sheet according to an absorbent article, wherein a bonding portion is provided.
このような吸収性物品に係る複合シートの製造装置によれば、前述の製造方法において述べたのと同じ理屈で、複合シートに綺麗な皺を形成可能となる。
According to the composite sheet manufacturing apparatus relating to such an absorbent article, it is possible to form a beautiful wrinkle on the composite sheet with the same reason as described in the above manufacturing method.
===本実施形態===
本実施形態の吸収性物品に係る複合シートの製造方法は、吸収性物品の一例としてのパンツ型の使い捨ておむつ1の製造ラインLMで使用される。そして、同ラインLMでは、上記の複合シートとしておむつ1の基材シート7aが製造される。
<<<使い捨ておむつ1>>>
図1Aは、パンツ型のおむつ1の概略斜視図である。図1Bは、展開状態のおむつ1を肌側から見た概略平面図である。図2は、展開状態のおむつ1を分解して示す概略斜視図である。
なお、以下の説明では、おむつ1が着用者に装着された際に、当該着用者の肌側に位置すべき側のことを単に「肌側」と言い、他方、着用者の非肌側に位置すべき側のことを単に「非肌側」と言う。 === This Embodiment ===
The manufacturing method of the composite sheet which concerns on the absorbent article of this embodiment is used with the production line LM of the underpants type disposable diaper 1 as an example of an absorbent article. And in the same line LM, thebase material sheet 7a of the diaper 1 is manufactured as said composite sheet.
<<< Disposable Diaper 1 >>>
FIG. 1A is a schematic perspective view of a pant-type diaper 1. FIG. 1B is a schematic plan view of the unfolded diaper 1 as seen from the skin side. FIG. 2 is a schematic perspective view showing the exploded diaper 1 in an exploded state.
In the following description, when the diaper 1 is attached to the wearer, the side that should be located on the skin side of the wearer is simply referred to as “skin side”, and on the other hand, on the non-skin side of the wearer. The side to be positioned is simply referred to as the “non-skin side”.
本実施形態の吸収性物品に係る複合シートの製造方法は、吸収性物品の一例としてのパンツ型の使い捨ておむつ1の製造ラインLMで使用される。そして、同ラインLMでは、上記の複合シートとしておむつ1の基材シート7aが製造される。
<<<使い捨ておむつ1>>>
図1Aは、パンツ型のおむつ1の概略斜視図である。図1Bは、展開状態のおむつ1を肌側から見た概略平面図である。図2は、展開状態のおむつ1を分解して示す概略斜視図である。
なお、以下の説明では、おむつ1が着用者に装着された際に、当該着用者の肌側に位置すべき側のことを単に「肌側」と言い、他方、着用者の非肌側に位置すべき側のことを単に「非肌側」と言う。 === This Embodiment ===
The manufacturing method of the composite sheet which concerns on the absorbent article of this embodiment is used with the production line LM of the underpants type disposable diaper 1 as an example of an absorbent article. And in the same line LM, the
<<< Disposable Diaper 1 >>>
FIG. 1A is a schematic perspective view of a pant-type diaper 1. FIG. 1B is a schematic plan view of the unfolded diaper 1 as seen from the skin side. FIG. 2 is a schematic perspective view showing the exploded diaper 1 in an exploded state.
In the following description, when the diaper 1 is attached to the wearer, the side that should be located on the skin side of the wearer is simply referred to as “skin side”, and on the other hand, on the non-skin side of the wearer. The side to be positioned is simply referred to as the “non-skin side”.
図1B及び図2に示すように、このおむつ1は、例えば2ピースタイプのおむつ1である。すなわち、同おむつ1は、尿などの***液を吸収する例えば平面視略長方形形状の吸収性本体3を第1部品として有し、そして、上記吸収性本体3の非肌側面を覆って設けられておむつ1の外装をなす平面視略砂時計形状の外装シート7を第2部品として有している。
As shown in FIG. 1B and FIG. 2, the diaper 1 is, for example, a two-piece type diaper 1. That is, the diaper 1 has, as a first part, an absorbent main body 3 having a substantially rectangular shape in plan view that absorbs excretory fluid such as urine, and is provided to cover the non-skin side surface of the absorbent main body 3. The outer sheet 7 having a substantially hourglass shape in plan view that forms the outer casing of the diaper 1 is provided as the second component.
図2に示すように、吸収性本体3は、***液を吸収する吸収性コア3cを有する。吸収性コア3cは、パルプ繊維等の液体吸収性繊維や高吸収性ポリマー等の液体吸収性粒状物を、所定形状の一例としての平面視略長方形形状に成形したものである。なお、かかる吸収性コア3cは、必要に応じてティッシュペーパー等の液透過性の被覆シートで被覆されていても良い。
2, the absorptive main body 3 has an absorptive core 3c that absorbs excretory fluid. The absorbent core 3c is formed by molding liquid absorbent fibers such as pulp fibers and liquid absorbent granular materials such as superabsorbent polymers into a substantially rectangular shape in plan view as an example of a predetermined shape. In addition, this absorptive core 3c may be coat | covered with liquid-permeable coating sheets, such as tissue paper, as needed.
かかる吸収性コア3cの肌側面には、当該面を覆うように不織布等の液透過性のトップシート4が設けられており、同様に、同吸収性コア3cの非肌側面には、当該面を全面に亘って覆うようにフィルム等の液不透過性の防漏シート5が設けられている。
ここで、この例では、どちらのシート4,5も、平面視略長方形形状に形成されており、また、どちらのシート4,5も、吸収性コア3cの長手方向の各端部から外方に飛び出している。そして、トップシート4において飛び出した部分4eLと防漏シート5において飛び出した部分5eLとが、互いに接着や溶着等によって接合されている。また、幅方向に関しては、防漏シート5のみが吸収性コア3cの両側から外方に飛び出すような寸法とされており、この飛び出した各部分5eW,5ewは、それぞれ肌側に折り返されて、トップシート4の幅方向の各端部を覆った状態で接着や溶着等によって固定されている。そして、これにより、吸収性コア3cは、トップシート4と防漏シート5とで包まれた状態にされて、その結果、吸収性本体3の形態となっている。 The skin side surface of theabsorbent core 3c is provided with a liquid-permeable top sheet 4 such as a nonwoven fabric so as to cover the surface. Similarly, the non-skin side surface of the absorbent core 3c has the surface A liquid-impermeable leak-proof sheet 5 such as a film is provided so as to cover the entire surface.
Here, in this example, both the sheets 4 and 5 are formed in a substantially rectangular shape in plan view, and both the sheets 4 and 5 are outward from the respective end portions in the longitudinal direction of the absorbent core 3c. Jumped out. And the part 4eL which protruded in the top sheet 4 and the part 5eL which protruded in the leak-proof sheet 5 are mutually joined by adhesion | attachment, welding, etc. Further, with respect to the width direction, only the leak-proof sheet 5 is dimensioned so as to protrude outward from both sides of the absorbent core 3c, and the protruding portions 5eW and 5ew are respectively folded back to the skin side, The top sheet 4 is fixed by adhesion, welding or the like in a state of covering each end in the width direction. And thereby, the absorptive core 3c is made into the state wrapped by the top sheet | seat 4 and the leak-proof sheet | seat 5, As a result, it becomes the form of the absorptive main body 3. FIG.
ここで、この例では、どちらのシート4,5も、平面視略長方形形状に形成されており、また、どちらのシート4,5も、吸収性コア3cの長手方向の各端部から外方に飛び出している。そして、トップシート4において飛び出した部分4eLと防漏シート5において飛び出した部分5eLとが、互いに接着や溶着等によって接合されている。また、幅方向に関しては、防漏シート5のみが吸収性コア3cの両側から外方に飛び出すような寸法とされており、この飛び出した各部分5eW,5ewは、それぞれ肌側に折り返されて、トップシート4の幅方向の各端部を覆った状態で接着や溶着等によって固定されている。そして、これにより、吸収性コア3cは、トップシート4と防漏シート5とで包まれた状態にされて、その結果、吸収性本体3の形態となっている。 The skin side surface of the
Here, in this example, both the
外装シート7は、図1Bの展開状態においては、平面視略砂時計形状の柔軟なシートであり、同シート7は、互いに直交する三方向として、厚さ方向と長手方向と幅方向とを有している。また、当該外装シート7は、長手方向に関して三つの部分7f,7b,7cに区分される。すなわち、外装シート7は、着用者の腹側に配される腹側部7fと、着用者の背側に配される背側部7bと、着用者の股間に配される股下部7cとに区分される。なお、当然ながら、股下部7cは、腹側部7fと背側部7bとの間に位置しており、これにより、当該股下部7cは、平面視略砂時計形状において幅方向に括れた形状の部分7cとなっている。
1B is a flexible sheet having a substantially hourglass shape in a plan view, and the sheet 7 has a thickness direction, a longitudinal direction, and a width direction as three directions orthogonal to each other. ing. The exterior sheet 7 is divided into three portions 7f, 7b, and 7c with respect to the longitudinal direction. That is, the exterior sheet 7 is formed on an abdominal side portion 7f disposed on the wearer's belly side, a back side portion 7b disposed on the wearer's back side, and a crotch portion 7c disposed on the wearer's crotch. It is divided. Of course, the crotch part 7c is located between the abdomen side part 7f and the dorsal side part 7b, so that the crotch part 7c has a shape that is constricted in the width direction in a substantially hourglass shape in plan view. This is part 7c.
図2に示すように、かかる外装シート7には、二層構造の所謂ラミネートシート7が使用されている。すなわち、当該外装シート7は、おむつ1の着用時に着用者の肌側を向いて内層をなす内層シート8と、同着用時に非肌側を向いて外層をなす外層シート9と、を有し、かかる内層シート8と外層シート9とは、厚さ方向に重ね合わせられつつ接着又は溶着等で接合される。なお、この例では、接合された部分たる接合部j,j…が非連続に分散してなる所定の接合パターンで溶着されており(図3を参照)、これについては後述する。
As shown in FIG. 2, a so-called laminate sheet 7 having a two-layer structure is used for the exterior sheet 7. That is, the exterior sheet 7 has an inner layer sheet 8 that forms an inner layer facing the wearer's skin when the diaper 1 is worn, and an outer layer sheet 9 that forms an outer layer facing the non-skin side during the wearing, The inner layer sheet 8 and the outer layer sheet 9 are bonded together by adhesion or welding while being overlapped in the thickness direction. In this example, the joined portions j, j... Which are joined portions are welded in a predetermined joining pattern formed by discontinuous dispersion (see FIG. 3), which will be described later.
かかる内層シート8の材料には、おむつ1の幅方向に伸縮性を有した伸縮性シート8が使用されており、他方、外層シート9の材料には、おむつ1の幅方向に低い伸長性の低伸長性シート9が使用されている。そして、伸縮性の内層シート8が幅方向に自然長の2.5倍等のような所定の伸長倍率まで伸長された状態(以下、伸長状態とも言う)で、同じく幅方向に張った状態の低伸長性の外層シート9に重ね合わせられて、これら両シート8,9同士は上記の接合パターンで一体的に固定されている。
そのため、かかる伸長状態が解除されると、内層シート8は自身の伸縮性に基づいておむつ1の幅方向に収縮するが、このとき、低伸長性の外層シート9については、複数の皺状におむつ1の幅方向に折れ曲がり、これにより、同外層シート9は、内層シート8の収縮に速やかに追従して、幅方向の全長を短くする。そして、その結果、おむつ1に外力が作用しない無負荷状態においては、外装シート7は全体として幅方向に短縮しているとともに、同外装シート7の外面は、外層シート9の上記折れ曲がりに起因して複数の皺が寄った状態となっている。但し、かかる外装シート7に幅方向の引っ張りの外力を付与すると、上記皺が伸びきるまで当該外装シート7は略弾性的に伸長し得て、これにより、おむつ1の外装シート7は、幅方向に伸縮性を有した仕様となっている。 As the material of the inner layer sheet 8, a stretchable sheet 8 having stretchability in the width direction of the diaper 1 is used. On the other hand, the material of the outer layer sheet 9 has a low extensibility in the width direction of the diaper 1. A low stretch sheet 9 is used. The stretchable inner layer sheet 8 is stretched to a predetermined stretch ratio such as 2.5 times the natural length in the width direction (hereinafter also referred to as the stretched state), and is also stretched in the width direction. Overlaid on the low-extension outer layer sheet 9, both the sheets 8 and 9 are fixed integrally with the above-mentioned joining pattern.
Therefore, when the stretched state is released, the inner layer sheet 8 shrinks in the width direction of the diaper 1 based on its own stretchability. At this time, the low stretchable outer layer sheet 9 has a plurality of hooks. The diaper 1 bends in the width direction, whereby the outer layer sheet 9 quickly follows the contraction of the inner layer sheet 8 and shortens the entire length in the width direction. As a result, in an unloaded state where no external force acts on the diaper 1, theouter sheet 7 is shortened in the width direction as a whole, and the outer surface of the outer sheet 7 is caused by the bending of the outer layer sheet 9. It is in a state where several traps are approaching. However, when an external force is applied to the exterior sheet 7 in the width direction, the exterior sheet 7 can be stretched approximately elastically until the wrinkle is fully extended, whereby the exterior sheet 7 of the diaper 1 It has become a specification with elasticity.
そのため、かかる伸長状態が解除されると、内層シート8は自身の伸縮性に基づいておむつ1の幅方向に収縮するが、このとき、低伸長性の外層シート9については、複数の皺状におむつ1の幅方向に折れ曲がり、これにより、同外層シート9は、内層シート8の収縮に速やかに追従して、幅方向の全長を短くする。そして、その結果、おむつ1に外力が作用しない無負荷状態においては、外装シート7は全体として幅方向に短縮しているとともに、同外装シート7の外面は、外層シート9の上記折れ曲がりに起因して複数の皺が寄った状態となっている。但し、かかる外装シート7に幅方向の引っ張りの外力を付与すると、上記皺が伸びきるまで当該外装シート7は略弾性的に伸長し得て、これにより、おむつ1の外装シート7は、幅方向に伸縮性を有した仕様となっている。 As the material of the inner layer sheet 8, a stretchable sheet 8 having stretchability in the width direction of the diaper 1 is used. On the other hand, the material of the outer layer sheet 9 has a low extensibility in the width direction of the diaper 1. A low stretch sheet 9 is used. The stretchable inner layer sheet 8 is stretched to a predetermined stretch ratio such as 2.5 times the natural length in the width direction (hereinafter also referred to as the stretched state), and is also stretched in the width direction. Overlaid on the low-extension outer layer sheet 9, both the sheets 8 and 9 are fixed integrally with the above-mentioned joining pattern.
Therefore, when the stretched state is released, the inner layer sheet 8 shrinks in the width direction of the diaper 1 based on its own stretchability. At this time, the low stretchable outer layer sheet 9 has a plurality of hooks. The diaper 1 bends in the width direction, whereby the outer layer sheet 9 quickly follows the contraction of the inner layer sheet 8 and shortens the entire length in the width direction. As a result, in an unloaded state where no external force acts on the diaper 1, the
なお、かかる外装シート7のうちの外層シート9の皺は、おむつ1の見栄えを左右し得る。そのため、本実施形態では、かかる皺が綺麗に寄るように工夫されている。図3は、その工夫を説明すべく、皺が伸びきって幅方向に張った伸長状態(後述の第1の伸長状態)の外装シート7を外層シート9側から見た概略拡大図である。
同図3に示すように、先ず、上記の接合パターンに基づいて外層シート9には、内層シート8と接合するための複数の接合部j,j…が形成されているが、かかる複数の接合部j,j…は、上記幅方向及び上記長手方向の両方向について非連続に分散して設けられている。図3の例では、複数の接合部j,j…は、所謂千鳥パターンで配されている。すなわち、千鳥パターンにあっては、複数の接合部j,j…が幅方向に間隔をあけながら幅方向に所定のピッチPjWで並んでなる接合部列Rjを複数列有するとともに、当該複数列の接合部列Rj,Rj…は、それぞれ、長手方向に隣り合う接合部列Rjとの間で、幅方向に半ピッチ(=PjW/2)だけずれて配されている。
また、各接合部j,j…は、当該接合に起因して高剛性となっているために、皺が寄り難いが、これに対して、幅方向に隣り合う接合部j,j同士の間に位置する非接合部jn(接合されていない部分jnのこと)については、当該非接合に起因して低剛性となっている。そのため、外層シート9が幅方向に収縮した際には、主に非接合部jn,jn…に皺が寄る。そして、このとき、当該皺が非接合部jn,jn…毎に寄っていれば、外層シート9の見栄えは良好なものとなる。すなわち、非接合部jnに、寄り損ないの皺が少ない方が、その見栄えは良好になる。また、通常、皺は、剛性差が付いている部分に寄り易い。
そこで、この例では、各非接合部jn,jn…にそれぞれ確実に皺を寄せる目的で、内層シート8に接合される前の外層シート9に対して予め剛性差を非接合部jn毎に付与している。なお、剛性差の付与は、次のようにして実現される。すなわち、外層シート9に対して、幅方向に延伸された第1部分9a1と、当該第1部分9a1よりも延伸されていない第2部分9a2とを幅方向に交互に形成するが、このときには、当該第1部分9a1の幅方向の中央位置C9a1と第2部分9a2の幅方向の中央位置C9a2とが、それぞれ少なくとも一つずつ各非接合部jnに含まれるようにする。そして、これにより、各非接合部jnでは、第1部分9a1と第2部分9a2との剛性差に基づいて、それぞれ皺が寄り易くなる。そして、その結果、上記の幅方向の収縮力が外層シート9に作用すると、各非接合部jnには、それぞれ皺が形成されて、これにより、全体として、おむつ1の外層シート9の見栄えは良好となる。 In addition, the wrinkles of the outer layer sheet 9 in theexterior sheet 7 can affect the appearance of the diaper 1. Therefore, in this embodiment, it is devised so that such a wrinkle approaches beautifully. FIG. 3 is a schematic enlarged view of the exterior sheet 7 in the stretched state (first stretched state described later) in which the wrinkles are fully stretched and stretched in the width direction, from the outer layer sheet 9 side, in order to explain the device.
As shown in FIG. 3, first, based on the above-described bonding pattern, the outer layer sheet 9 is formed with a plurality of bonding portions j, j... For bonding to the inner layer sheet 8. The parts j, j... Are provided in a discontinuous manner in both the width direction and the longitudinal direction. In the example of FIG. 3, the plurality of joint portions j, j... Are arranged in a so-called staggered pattern. That is, in the staggered pattern, the plurality of joint portions j, j... Have a plurality of joint portion rows Rj arranged at a predetermined pitch PjW in the width direction while being spaced apart in the width direction. .. Are arranged so as to be shifted by a half pitch (= PjW / 2) in the width direction between the joint rows Rj,... Adjacent to each other in the longitudinal direction.
In addition, since each joint j, j... Is highly rigid due to the joint, it is difficult for wrinkles to move. On the other hand, between the joints j, j adjacent to each other in the width direction. The non-joining part jn located at (the part jn that is not joined) has low rigidity due to the non-joining. Therefore, when the outer layer sheet 9 contracts in the width direction, wrinkles mainly occur at the non-joined portions jn, jn. And if the said wrinkle is approaching for every non-joining part jn, jn ... at this time, the appearance of the outer-layer sheet | seat 9 will become favorable. That is, the appearance of the non-joint portion jn is better when there is less misalignment. In addition, the heel usually tends to move toward a portion having a difference in rigidity.
Therefore, in this example, for the purpose of surely wrinkling each non-joined portion jn, jn..., A rigidity difference is given in advance to the non-joined portion jn with respect to the outer layer sheet 9 before being joined to the inner layer sheet 8. is doing. Note that the application of the rigidity difference is realized as follows. That is, for the outer layer sheet 9, the first portions 9a1 extended in the width direction and the second portions 9a2 not extended more than the first portion 9a1 are alternately formed in the width direction. At least one center position C9a1 in the width direction of the first portion 9a1 and one center position C9a2 in the width direction of the second portion 9a2 are included in each non-joining portion jn. And thereby, in each non-joining part jn, a wrinkle becomes easy to approach based on the rigidity difference of the 1st part 9a1 and the 2nd part 9a2. And as a result, when the contraction force in the width direction acts on the outer layer sheet 9, a crease is formed in each non-joined portion jn, and as a result, the appearance of the outer layer sheet 9 of the diaper 1 is as a whole. It becomes good.
同図3に示すように、先ず、上記の接合パターンに基づいて外層シート9には、内層シート8と接合するための複数の接合部j,j…が形成されているが、かかる複数の接合部j,j…は、上記幅方向及び上記長手方向の両方向について非連続に分散して設けられている。図3の例では、複数の接合部j,j…は、所謂千鳥パターンで配されている。すなわち、千鳥パターンにあっては、複数の接合部j,j…が幅方向に間隔をあけながら幅方向に所定のピッチPjWで並んでなる接合部列Rjを複数列有するとともに、当該複数列の接合部列Rj,Rj…は、それぞれ、長手方向に隣り合う接合部列Rjとの間で、幅方向に半ピッチ(=PjW/2)だけずれて配されている。
また、各接合部j,j…は、当該接合に起因して高剛性となっているために、皺が寄り難いが、これに対して、幅方向に隣り合う接合部j,j同士の間に位置する非接合部jn(接合されていない部分jnのこと)については、当該非接合に起因して低剛性となっている。そのため、外層シート9が幅方向に収縮した際には、主に非接合部jn,jn…に皺が寄る。そして、このとき、当該皺が非接合部jn,jn…毎に寄っていれば、外層シート9の見栄えは良好なものとなる。すなわち、非接合部jnに、寄り損ないの皺が少ない方が、その見栄えは良好になる。また、通常、皺は、剛性差が付いている部分に寄り易い。
そこで、この例では、各非接合部jn,jn…にそれぞれ確実に皺を寄せる目的で、内層シート8に接合される前の外層シート9に対して予め剛性差を非接合部jn毎に付与している。なお、剛性差の付与は、次のようにして実現される。すなわち、外層シート9に対して、幅方向に延伸された第1部分9a1と、当該第1部分9a1よりも延伸されていない第2部分9a2とを幅方向に交互に形成するが、このときには、当該第1部分9a1の幅方向の中央位置C9a1と第2部分9a2の幅方向の中央位置C9a2とが、それぞれ少なくとも一つずつ各非接合部jnに含まれるようにする。そして、これにより、各非接合部jnでは、第1部分9a1と第2部分9a2との剛性差に基づいて、それぞれ皺が寄り易くなる。そして、その結果、上記の幅方向の収縮力が外層シート9に作用すると、各非接合部jnには、それぞれ皺が形成されて、これにより、全体として、おむつ1の外層シート9の見栄えは良好となる。 In addition, the wrinkles of the outer layer sheet 9 in the
As shown in FIG. 3, first, based on the above-described bonding pattern, the outer layer sheet 9 is formed with a plurality of bonding portions j, j... For bonding to the inner layer sheet 8. The parts j, j... Are provided in a discontinuous manner in both the width direction and the longitudinal direction. In the example of FIG. 3, the plurality of joint portions j, j... Are arranged in a so-called staggered pattern. That is, in the staggered pattern, the plurality of joint portions j, j... Have a plurality of joint portion rows Rj arranged at a predetermined pitch PjW in the width direction while being spaced apart in the width direction. .. Are arranged so as to be shifted by a half pitch (= PjW / 2) in the width direction between the joint rows Rj,... Adjacent to each other in the longitudinal direction.
In addition, since each joint j, j... Is highly rigid due to the joint, it is difficult for wrinkles to move. On the other hand, between the joints j, j adjacent to each other in the width direction. The non-joining part jn located at (the part jn that is not joined) has low rigidity due to the non-joining. Therefore, when the outer layer sheet 9 contracts in the width direction, wrinkles mainly occur at the non-joined portions jn, jn. And if the said wrinkle is approaching for every non-joining part jn, jn ... at this time, the appearance of the outer-layer sheet | seat 9 will become favorable. That is, the appearance of the non-joint portion jn is better when there is less misalignment. In addition, the heel usually tends to move toward a portion having a difference in rigidity.
Therefore, in this example, for the purpose of surely wrinkling each non-joined portion jn, jn..., A rigidity difference is given in advance to the non-joined portion jn with respect to the outer layer sheet 9 before being joined to the inner layer sheet 8. is doing. Note that the application of the rigidity difference is realized as follows. That is, for the outer layer sheet 9, the first portions 9a1 extended in the width direction and the second portions 9a2 not extended more than the first portion 9a1 are alternately formed in the width direction. At least one center position C9a1 in the width direction of the first portion 9a1 and one center position C9a2 in the width direction of the second portion 9a2 are included in each non-joining portion jn. And thereby, in each non-joining part jn, a wrinkle becomes easy to approach based on the rigidity difference of the 1st part 9a1 and the 2nd part 9a2. And as a result, when the contraction force in the width direction acts on the outer layer sheet 9, a crease is formed in each non-joined portion jn, and as a result, the appearance of the outer layer sheet 9 of the diaper 1 is as a whole. It becomes good.
なお、図3の例では、複数列の接合部列Rj,Rj…が、上記の長手方向に所定ピッチPRjで並んでいるが、かかるピッチPRjについては、例えば1.5mm~5mmの範囲から任意値が選択され、望ましくは、2mm~4mmの範囲から、更に望ましくは、2mm~3mmの範囲から任意値が選択される。なお、各範囲の下限値よりも小さいと、皺を形成するための十分な大きさを非接合部jnに確保し難くなり、他方、各範囲の上限値よりも大きいと、伸縮性シート8aと低伸長性シート9atとの固定が弱くなる。そのため、上記の範囲に収めるのが好ましい。但し、何等上記の範囲に限らない。
In the example of FIG. 3, a plurality of joint rows Rj, Rj,... Are arranged at a predetermined pitch PRj in the longitudinal direction, and the pitch PRj is arbitrary from a range of 1.5 mm to 5 mm, for example. A value is selected, preferably an arbitrary value from the range of 2 mm to 4 mm, more preferably from a range of 2 mm to 3 mm. In addition, when it is smaller than the lower limit value of each range, it is difficult to secure a sufficient size for forming the ridges in the non-joined portion jn. On the other hand, when it is larger than the upper limit value of each range, the elastic sheet 8a and Fixation with the low extensibility sheet 9at becomes weak. Therefore, it is preferable to be within the above range. However, it is not limited to the above range.
また、かかる第1部分9a1と第2部分9a2を形成する形成処理や接合部j,j…を形成する接合処理等については後述する。
Further, the forming process for forming the first part 9a1 and the second part 9a2, the bonding process for forming the joints j, j... Will be described later.
ところで、ここで言う「伸縮性」とは、引っ張りの外力が作用すると、外力の作用方向に略弾性的に伸長するとともに、当該外力が解除されると、略弾性的に収縮する性質のことである。また、繰り返しになるが、かかる伸縮性を有したシートが、上記の「伸縮性シート8」である。
かかる伸縮性シート8は、望ましくは、以下の条件を満たすと良い。すなわち、短手方向の寸法が25mmの帯状シートの長手方向の両端部をそれぞれ上記短手方向に25mmの全長で均等に把持した状態で、上記両端部をそれぞれ力点として1.0(N)の外力で長手方向に引っ張ったときの伸び率(%)が50%~300%の範囲の任意値になっているとともに、上記外力を解除して収縮した後に縮まずに残る残留伸び歪み(%)が、0%~40%の範囲の任意値になっていると良い。また、より望ましくは、上記伸び率が、70%~200%の範囲の任意値になっているとともに、残留伸び歪みが、0%~30%の範囲の任意値になっていると良い。ちなみに、上記の伸び率(%)というのは、1.0(N)の外力で引っ張ったときの帯状シートの長さL1から、引っ張る前の無負荷時における帯状シートの長さたる自然長L0を減算してなる減算値ΔL1(=L1-L0)を、上記自然長L0で除算してなる除算値(=ΔL1/L0)の百分率表記値のことである。また、上記の残留伸び歪み(%)というのは、上記の1.0(N)の外力を解除後の長さL2から上記引っ張る前の自然長L0を減算してなる減算値ΔL2(=L2-L0)を、上記の外力で引っ張ったときの長さL1から上記自然長L0を減算してなる減算値ΔL1(=L1-L0)で除算してなる除算値(=ΔL2/ΔL1)の百分率表記値のことである。 By the way, the term “stretchability” as used herein refers to the property that when an external force of tension is applied, it stretches approximately elastically in the direction of the external force and contracts approximately elastically when the external force is released. is there. Moreover, although it repeats, the sheet | seat which has this elasticity is said "elastic sheet 8".
Such a stretchable sheet 8 desirably satisfies the following conditions. That is, in the state where both ends in the longitudinal direction of the belt-like sheet having a short dimension of 25 mm are equally gripped with the total length of 25 mm in the short direction, the both ends are each 1.0 (N) as a power point. The elongation (%) when pulled in the longitudinal direction by an external force is an arbitrary value in the range of 50% to 300%, and the residual elongation strain (%) that remains without contracting after the external force is released and contracted However, it is preferable that the value is an arbitrary value in the range of 0% to 40%. More preferably, the elongation rate is an arbitrary value in the range of 70% to 200%, and the residual elongation strain is an arbitrary value in the range of 0% to 30%. Incidentally, the above-mentioned elongation rate (%) is the natural length L0, which is the length of the belt-like sheet at the time of no load before being pulled, from the length L1 of the belt-like sheet when pulled with an external force of 1.0 (N). Is a percentage notation value of a division value (= ΔL1 / L0) obtained by dividing a subtraction value ΔL1 (= L1−L0) obtained by subtracting by the natural length L0. The residual elongation strain (%) is a subtracted value ΔL2 (= L2) obtained by subtracting the natural length L0 before pulling from the length L2 after releasing the external force of 1.0 (N). -L0) is a percentage of the division value (= ΔL2 / ΔL1) obtained by dividing the natural length L0 by the subtraction value ΔL1 (= L1−L0) obtained by subtracting the natural length L0 from the length L1 when pulled by the external force. It is a written value.
かかる伸縮性シート8は、望ましくは、以下の条件を満たすと良い。すなわち、短手方向の寸法が25mmの帯状シートの長手方向の両端部をそれぞれ上記短手方向に25mmの全長で均等に把持した状態で、上記両端部をそれぞれ力点として1.0(N)の外力で長手方向に引っ張ったときの伸び率(%)が50%~300%の範囲の任意値になっているとともに、上記外力を解除して収縮した後に縮まずに残る残留伸び歪み(%)が、0%~40%の範囲の任意値になっていると良い。また、より望ましくは、上記伸び率が、70%~200%の範囲の任意値になっているとともに、残留伸び歪みが、0%~30%の範囲の任意値になっていると良い。ちなみに、上記の伸び率(%)というのは、1.0(N)の外力で引っ張ったときの帯状シートの長さL1から、引っ張る前の無負荷時における帯状シートの長さたる自然長L0を減算してなる減算値ΔL1(=L1-L0)を、上記自然長L0で除算してなる除算値(=ΔL1/L0)の百分率表記値のことである。また、上記の残留伸び歪み(%)というのは、上記の1.0(N)の外力を解除後の長さL2から上記引っ張る前の自然長L0を減算してなる減算値ΔL2(=L2-L0)を、上記の外力で引っ張ったときの長さL1から上記自然長L0を減算してなる減算値ΔL1(=L1-L0)で除算してなる除算値(=ΔL2/ΔL1)の百分率表記値のことである。 By the way, the term “stretchability” as used herein refers to the property that when an external force of tension is applied, it stretches approximately elastically in the direction of the external force and contracts approximately elastically when the external force is released. is there. Moreover, although it repeats, the sheet | seat which has this elasticity is said "elastic sheet 8".
Such a stretchable sheet 8 desirably satisfies the following conditions. That is, in the state where both ends in the longitudinal direction of the belt-like sheet having a short dimension of 25 mm are equally gripped with the total length of 25 mm in the short direction, the both ends are each 1.0 (N) as a power point. The elongation (%) when pulled in the longitudinal direction by an external force is an arbitrary value in the range of 50% to 300%, and the residual elongation strain (%) that remains without contracting after the external force is released and contracted However, it is preferable that the value is an arbitrary value in the range of 0% to 40%. More preferably, the elongation rate is an arbitrary value in the range of 70% to 200%, and the residual elongation strain is an arbitrary value in the range of 0% to 30%. Incidentally, the above-mentioned elongation rate (%) is the natural length L0, which is the length of the belt-like sheet at the time of no load before being pulled, from the length L1 of the belt-like sheet when pulled with an external force of 1.0 (N). Is a percentage notation value of a division value (= ΔL1 / L0) obtained by dividing a subtraction value ΔL1 (= L1−L0) obtained by subtracting by the natural length L0. The residual elongation strain (%) is a subtracted value ΔL2 (= L2) obtained by subtracting the natural length L0 before pulling from the length L2 after releasing the external force of 1.0 (N). -L0) is a percentage of the division value (= ΔL2 / ΔL1) obtained by dividing the natural length L0 by the subtraction value ΔL1 (= L1−L0) obtained by subtracting the natural length L0 from the length L1 when pulled by the external force. It is a written value.
また、「低伸長性シート9」とは、上記の伸縮性シート8よりも低い伸長性のシートのことである。すなわち、所定の大きさの引っ張りの外力が作用した際の伸び率(%)が、上記の伸縮性シート8の伸び率(%)よりも低いシートのことである。なお、かかる低伸長性シート9は、望ましくは、以下の条件を満たすと良い。すなわち、短手方向の寸法が25mmの帯状シートの長手方向の両端部をそれぞれ上記短手方向に25mmの全長で均等に把持した状態で、上記両端部をそれぞれ力点として1.0(N)の外力で長手方向に引っ張ったときの伸び率(%)が0%~20%の範囲の任意値になっていると良い。また、より望ましくは、上記伸び率が、0%~10%の範囲の任意値になっていると良い。
Further, the “low stretch sheet 9” is a stretch sheet lower than the stretch sheet 8 described above. That is, the stretch rate (%) when an external force of a predetermined amount of tension is applied is lower than the stretch rate (%) of the stretchable sheet 8 described above. Note that the low-extensible sheet 9 desirably satisfies the following conditions. That is, in the state where both ends in the longitudinal direction of the belt-like sheet having a short dimension of 25 mm are equally gripped with the total length of 25 mm in the short direction, the both ends are each 1.0 (N) as a power point. The elongation (%) when pulled in the longitudinal direction by an external force is preferably an arbitrary value in the range of 0% to 20%. More preferably, the elongation rate is an arbitrary value in the range of 0% to 10%.
なお、かかる伸縮性シート8及び低伸長性シート9の形態としては、不織布でも良いし、織布でも良いし、フィルムでも良い。
In addition, as a form of the stretchable sheet 8 and the low stretchable sheet 9, a non-woven fabric, a woven fabric, or a film may be used.
伸縮性シート8に利用可能な不織布の具体例については、略弾性を示す熱可塑性エラストマー製繊維と、略非弾性を示す熱可塑性樹脂製繊維とを有した不織布に対してギア延伸処理等の適宜な延伸処理を施した不織布を例示できる。すなわち、かかる延伸処理を行うことによって、不織布に含まれる略非弾性の熱可塑性樹脂製繊維を塑性変形させたり、同繊維同士の接合点を破壊等すれば、熱可塑性エラストマー製繊維の略弾性的な伸縮変形を阻害し難い構造に当該不織布を変化させることができて、これにより、当該不織布の伸縮性が発現されて、伸縮性シート8として使用可能な状態となる。
なお、略弾性の熱可塑性エラストマーとしては、ポリウレタン系エラストマー、ポリスチレン系エラストマー、ポリオレフィン系エラストマー、ポリアミド系エラストマー等を例示することができる。また、略非弾性の熱可塑性樹脂製繊維としては、ポリオレフィン系樹脂を含む繊維などを例示でき、更にポリオレフィン系樹脂としては、ポリエチレン(PE)、ポリプロピレン(PP)、エチレン-αオレフィン共重合体等を例示することができる。ちなみに、この例では、伸縮性シート8として、ポリウレタン系エラストマー製繊維とPP繊維とを有した混繊タイプの不織布に対してギア延伸処理を施したものが使用されている。 About the specific example of the nonwoven fabric which can be utilized for the elastic sheet 8, it is appropriate to perform a gear stretching process or the like on a nonwoven fabric having a thermoplastic elastomer fiber exhibiting substantially elasticity and a thermoplastic resin fiber exhibiting substantially inelasticity. Examples of the nonwoven fabric subjected to various stretching treatments. That is, by performing such stretching treatment, if the substantially inelastic thermoplastic resin fibers contained in the nonwoven fabric are plastically deformed or the joints between the fibers are destroyed, the substantially elastic fibers of the thermoplastic elastomer fibers can be obtained. The nonwoven fabric can be changed to a structure that hardly inhibits elastic deformation, whereby the stretchability of the nonwoven fabric is expressed and the stretchable sheet 8 can be used.
Examples of the substantially elastic thermoplastic elastomer include polyurethane elastomers, polystyrene elastomers, polyolefin elastomers, polyamide elastomers, and the like. Examples of substantially inelastic thermoplastic resin fibers include fibers containing polyolefin resins, and examples of polyolefin resins include polyethylene (PE), polypropylene (PP), and ethylene-α olefin copolymers. Can be illustrated. By the way, in this example, the stretchable sheet 8 is obtained by subjecting a mixed fiber type nonwoven fabric having polyurethane-based elastomer fibers and PP fibers to gear stretching treatment.
なお、略弾性の熱可塑性エラストマーとしては、ポリウレタン系エラストマー、ポリスチレン系エラストマー、ポリオレフィン系エラストマー、ポリアミド系エラストマー等を例示することができる。また、略非弾性の熱可塑性樹脂製繊維としては、ポリオレフィン系樹脂を含む繊維などを例示でき、更にポリオレフィン系樹脂としては、ポリエチレン(PE)、ポリプロピレン(PP)、エチレン-αオレフィン共重合体等を例示することができる。ちなみに、この例では、伸縮性シート8として、ポリウレタン系エラストマー製繊維とPP繊維とを有した混繊タイプの不織布に対してギア延伸処理を施したものが使用されている。 About the specific example of the nonwoven fabric which can be utilized for the elastic sheet 8, it is appropriate to perform a gear stretching process or the like on a nonwoven fabric having a thermoplastic elastomer fiber exhibiting substantially elasticity and a thermoplastic resin fiber exhibiting substantially inelasticity. Examples of the nonwoven fabric subjected to various stretching treatments. That is, by performing such stretching treatment, if the substantially inelastic thermoplastic resin fibers contained in the nonwoven fabric are plastically deformed or the joints between the fibers are destroyed, the substantially elastic fibers of the thermoplastic elastomer fibers can be obtained. The nonwoven fabric can be changed to a structure that hardly inhibits elastic deformation, whereby the stretchability of the nonwoven fabric is expressed and the stretchable sheet 8 can be used.
Examples of the substantially elastic thermoplastic elastomer include polyurethane elastomers, polystyrene elastomers, polyolefin elastomers, polyamide elastomers, and the like. Examples of substantially inelastic thermoplastic resin fibers include fibers containing polyolefin resins, and examples of polyolefin resins include polyethylene (PE), polypropylene (PP), and ethylene-α olefin copolymers. Can be illustrated. By the way, in this example, the stretchable sheet 8 is obtained by subjecting a mixed fiber type nonwoven fabric having polyurethane-based elastomer fibers and PP fibers to gear stretching treatment.
また、低伸長性シート9に利用可能な不織布の具体例については、PE、PP、ポリエステル、ポリアミドなどの繊維からなるスパンボンド不織布、メルトブローン不織布、スパンボンド不織布とメルトブローン不織布とスパンボンド不織布とを積層してなる所謂SMS不織布、エアスルー不織布等を例示できる。なお、繊維の構造については、何等上述の如き単一の熱可塑性樹脂からなる単独繊維に限るものではない。例えば、芯材がPPで鞘材がPEの芯鞘構造の複合繊維であっても良いし、これら以外の構造の繊維であっても良い。ちなみに、この例では、低伸長性シート9として、PP繊維のスパンボンド不織布が使用されている。
Moreover, about the specific example of the nonwoven fabric which can be utilized for the low elongation sheet | seat 9, it laminates | stacks the spunbond nonwoven fabric which consists of fibers, such as PE, PP, polyester, and polyamide, a meltblown nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, and a spunbond nonwoven fabric Examples of so-called SMS nonwoven fabrics and air-through nonwoven fabrics can be given. The fiber structure is not limited to a single fiber made of a single thermoplastic resin as described above. For example, a composite fiber having a core-sheath structure in which the core material is PP and the sheath material is PE may be used, or a fiber having a structure other than these may be used. Incidentally, in this example, a spunbonded nonwoven fabric of PP fibers is used as the low stretch sheet 9.
図1B及び図2に示すように、このような二層構造の外装シート7の肌側面、すなわち内層シート8の肌側面における幅方向の中央位置には、前述の吸収性本体3が互いの長手方向を揃えた状態で取り付けられている。かかる取り付けは、少なくとも吸収性本体3における長手方向の各端部3e,3eが外装シート7と接合されることでなされており、この例では、図2に示すように、各端部3e,3eには、それぞれ、吸収性本体3と外装シート7とを接合する接合部j3,j3が略T字状に形成されている。すなわち、各接合部j3,j3は、それぞれ、おむつ1の幅方向に長い横長帯状部分j3Wと、この横長帯状部分j3Wにおける上記幅方向の中央部を起点として股下部7cの方へと延在する縦長帯状部分j3Lとを有している。そして、これにより、吸収性本体3と外装シート7とが互いに必要以上に拘束し合うことを効果的に回避している。但し、かかる接合部j3の形状は、何等これに限らない。例えば、T字状の一対の接合部j3,j3同士の間の位置に更に点状の接合部j3Cを追設しても良いし、又は、吸収性本体3の各端部3e,3eの略全域に亘る広さの略矩形形状の接合部(不図示)を、当該各端部3e,3eにそれぞれ形成しても良いし、今述べた形状以外の形状の接合部を形成しても良い。更に、この例では、かかる接合部j3の形成は、ホットメルト接着剤の接着によって実現されているが、何等これに限らず、例えば溶着でも良い。
As shown in FIGS. 1B and 2, the absorptive main bodies 3 described above are arranged in the longitudinal direction at the center position in the width direction on the skin side surface of the exterior sheet 7 having such a two-layer structure, that is, the skin side surface of the inner layer sheet 8. It is attached with the direction aligned. Such attachment is performed by joining at least the end portions 3e, 3e in the longitudinal direction of the absorbent main body 3 to the exterior sheet 7. In this example, as shown in FIG. 2, each end portion 3e, 3e is attached. Are formed in a substantially T-shape with joint portions j3 and j3 for joining the absorbent main body 3 and the exterior sheet 7, respectively. That is, each joint j3, j3 extends toward the crotch portion 7c starting from the laterally long strip portion j3W that is long in the width direction of the diaper 1 and the central portion in the lateral direction of the lateral strip portion j3W. And a vertically long belt-like portion j3L. And this effectively avoids that the absorptive main body 3 and the exterior sheet 7 restrain each other more than necessary. However, the shape of the joint j3 is not limited to this. For example, a dotted joint j3C may be additionally provided at a position between the pair of T-shaped joints j3 and j3, or the end portions 3e and 3e of the absorbent main body 3 may be abbreviated. A joint portion (not shown) having a substantially rectangular shape extending over the entire area may be formed at each of the end portions 3e and 3e, or a joint portion having a shape other than the shape described above may be formed. . Furthermore, in this example, the formation of the joint j3 is realized by adhesion of a hot melt adhesive, but is not limited to this, and may be, for example, welding.
また、この例では、かかる吸収性本体3と外装シート7との取り付けは、外装シート7の幅方向の伸長状態を、前述の外層シート9と内層シート8とを固定する際の内層シート8の伸長状態(後述の「第1の伸長状態」に相当)よりも緩和した伸長状態(後述の「第2の伸長状態」に相当)においてなされている。そして、これにより、最終的にパンツ型のおむつ1になった際に吸収性本体3に生じ得る皺が軽減されており、その結果、吸収性本体3の吸液性の低下や尿漏れを効果的に抑制可能となっている。ちなみに、この緩和した伸長状態で吸収性本体3を外装シート7に取り付けることについては、この後の製造ラインLMの説明で述べる。
Moreover, in this example, attachment of this absorptive main body 3 and the exterior sheet 7 is the expansion | extension state of the width direction of the exterior sheet 7, and the inner layer sheet 8 at the time of fixing the above-mentioned outer layer sheet 9 and the inner layer sheet 8 is fixed. It is made in an extended state (corresponding to a “second extended state” described later) that is more relaxed than an extended state (corresponding to a “first extended state” described later). And the wrinkles which may arise in the absorptive main body 3 when it finally becomes the underpants type diaper 1 by this are reduced, As a result, the fall of the liquid absorbency of the absorptive main body 3 and urine leakage are effective. Can be suppressed. Incidentally, attaching the absorbent main body 3 to the exterior sheet 7 in this relaxed extended state will be described in the description of the production line LM.
そして、図1Bの如く吸収性本体3が取り付けられた外装シート7は、股下部7cにて二つ折りされて腹側部7fと背側部7bとが重ね合わせられる。そして、この重ね合わせられた状態において、腹側部7fと背側部7bとが幅方向の各端部7eWでそれぞれ接合されることにより、図1Aに示すような胴回り開口部HBと一対の脚回り開口部HL,HLとが形成されたパンツ型のおむつ1の形態にされる。
And the exterior sheet | seat 7 to which the absorptive main body 3 was attached like FIG. 1B is folded in two by the crotch part 7c, and the abdominal side part 7f and the back side part 7b are piled up. In this overlapped state, the abdomen side portion 7f and the back side portion 7b are joined at the respective end portions 7eW in the width direction, so that the waistline opening HB and the pair of legs as shown in FIG. It is made into the form of the underpants type diaper 1 in which the periphery opening part HL and HL were formed.
<<<おむつ1の製造ラインLM>>>
図4Aは、かかるおむつ1を製造する製造ラインLMの概略側面図である。また、図4Bには、図4Aに対応させて、おむつ1が製造されていく様子を概略平面視で示している。 <<< diaper 1 production line LM >>>
FIG. 4A is a schematic side view of a production line LM for producing the diaper 1. Moreover, FIG. 4B shows a state in which the diaper 1 is manufactured in a schematic plan view corresponding to FIG. 4A.
図4Aは、かかるおむつ1を製造する製造ラインLMの概略側面図である。また、図4Bには、図4Aに対応させて、おむつ1が製造されていく様子を概略平面視で示している。 <<< diaper 1 production line LM >>>
FIG. 4A is a schematic side view of a production line LM for producing the diaper 1. Moreover, FIG. 4B shows a state in which the diaper 1 is manufactured in a schematic plan view corresponding to FIG. 4A.
この製造ラインLMでは、最初におむつ1の基材シート7a(複合シートに相当)を生成する。そして、かかる基材シート7aを、適宜な搬送機構CV,CV…等によって、所定の搬送方向に沿って連続して搬送するが、かかる搬送中に、当該基材シート7aに対して打ち抜きや部品の取り付け等の種々の加工が施され、その度に順次基材シート7aが状態を変えていき、最終的に図1Aの状態のおむつ1が製造される。ちなみに、図4Bに示すように、この例では、基本的には、基材シート7aは所謂横流れ態様で搬送されている。つまり、おむつ1の幅方向に相当する方向を搬送方向に揃えながら、おむつ1となる部分が搬送方向に一列に並んだ状態で、基材シート7aは搬送されている。
In this production line LM, first, a base sheet 7a (corresponding to a composite sheet) of the diaper 1 is generated. Then, the base sheet 7a is continuously transported along a predetermined transport direction by an appropriate transport mechanism CV, CV, etc., and during the transport, punching and parts are performed on the base sheet 7a. The base sheet 7a sequentially changes its state each time, such as attachment, and finally the diaper 1 having the state shown in FIG. 1A is manufactured. Incidentally, as shown in FIG. 4B, in this example, the base sheet 7a is basically conveyed in a so-called lateral flow mode. That is, the base material sheet 7a is conveyed in a state in which portions corresponding to the diaper 1 are aligned in a line in the conveyance direction while aligning the direction corresponding to the width direction of the diaper 1 in the conveyance direction.
かかる搬送に供する搬送機構CVとしては、例えば、搬送ローラーや、載置面たるベルト面に吸着保持機能を有したサクションベルトコンベア、上下に対で配された無端ベルト同士の間を基材シート7aの搬送経路とするベルトコンベア等が使用される。
Examples of the transport mechanism CV used for the transport include a transport roller, a suction belt conveyor having a suction holding function on a belt surface as a mounting surface, and a base sheet 7a between endless belts arranged in pairs in the vertical direction. A belt conveyor or the like serving as the transport path is used.
製造ラインLMには、上記種々の加工処理を行うべく複数の処理部10,20…が搬送方向に並んで配されている。この例では、複数の処理部10,20…として、外装シート生成処理部10、脚回り開口部形成処理部20、外装シート収縮処理部30、吸収性本体取り付け処理部40、二つ折り処理部50、エンドシール処理部60、分断処理部70を有している。
In the production line LM, a plurality of processing units 10, 20,... Are arranged side by side in the transport direction in order to perform the various processing processes. In this example, as the plurality of processing units 10, 20..., The exterior sheet generation processing unit 10, the leg hole opening formation processing unit 20, the exterior sheet contraction processing unit 30, the absorbent main body attachment processing unit 40, and the two-fold processing unit 50. And an end seal processing unit 60 and a split processing unit 70.
以下、各処理部10~70について説明するが、以下の説明では、製造ラインLM上に設定された上記の搬送方向のことを「MD方向」と言う。また、MD方向と直交する方向の2方向のうちの一方を「CD方向」と言い、他方を「Z方向」と言う。なお、CD方向は、基材シート7aの幅方向と平行であり、図4A中では、紙面を貫通する方向を向いている。また、Z方向は、基材シート7aの厚さ方向と平行である。また、後述することからわかることではあるが、MD方向が「伸縮方向」と「所定方向」との両者に相当し、CD方向は、「伸縮方向と交差する方向」と「所定方向と交差する方向」との両者に相当する。
Hereinafter, each of the processing units 10 to 70 will be described. In the following description, the conveyance direction set on the production line LM is referred to as “MD direction”. One of the two directions orthogonal to the MD direction is referred to as “CD direction”, and the other is referred to as “Z direction”. The CD direction is parallel to the width direction of the substrate sheet 7a, and in FIG. 4A, the CD direction is the direction penetrating the paper surface. The Z direction is parallel to the thickness direction of the base sheet 7a. As will be understood from the description below, the MD direction corresponds to both the “stretching direction” and the “predetermined direction”, and the CD direction crosses the “direction intersecting the stretching direction” and the “predetermined direction”. It corresponds to both “direction”.
(1)外装シート生成処理部10
図5は、最初の処理部たる外装シート生成処理部10の概略側面図である。
この処理部10では、加工装置11と接合装置15とを用いて、おむつ1の基材シート7aとして、MD方向に連続してなる外装シート7の連続シート7a(以下では、単に外装シート7aと言う)を生成する。
すなわち、前者の加工装置11では、外層シート9となる低伸長性シート9の連続シート9a(以下では、単に「低伸長性シート9a」と言う)をMD方向に沿って搬送しながら、同シート9aに対して前述の第1部分9a1と第2部分9a2とをMD方向に交互に形成する(「準備すること」に相当)。
一方、後者の接合装置15では、伸縮方向をMD方向に沿わせて搬送される内層シート8たる伸縮性シート8の連続シート8a(以下では、単に「伸縮性シート8a」と言う)を、略自然長の状態から所定の伸長倍率までMD方向に伸長し、この伸長状態で同シート8aに上記の低伸長性シート9aを厚さ方向から重ね合わせて接合する(「固定すること」に相当)。そして、これにより、外装シート7aが生成される。以下、各装置11,15について詳しく説明する。 (1) Exterior sheetgeneration processing unit 10
FIG. 5 is a schematic side view of the exterior sheetgeneration processing unit 10 as the first processing unit.
In thisprocessing unit 10, using the processing device 11 and the joining device 15, as the base sheet 7a of the diaper 1, a continuous sheet 7a of the exterior sheet 7 that is continuous in the MD direction (hereinafter simply referred to as the exterior sheet 7a). Say).
That is, in theformer processing apparatus 11, the continuous sheet 9 a of the low-extension sheet 9 (hereinafter, simply referred to as “low-extension sheet 9 a”) serving as the outer layer sheet 9 is conveyed along the MD direction. The aforementioned first portion 9a1 and second portion 9a2 are alternately formed in the MD direction with respect to 9a (corresponding to “preparing”).
On the other hand, in the latter joiningdevice 15, a continuous sheet 8 a of the stretchable sheet 8 (hereinafter simply referred to as “stretchable sheet 8 a”) that is the inner layer sheet 8 that is conveyed with the stretchable direction along the MD direction is substantially omitted. The sheet is stretched in the MD direction from a natural length state to a predetermined stretching magnification, and the low-stretch sheet 9a is overlapped and joined to the sheet 8a from the thickness direction in this stretched state (corresponding to “fixing”). . Thus, the exterior sheet 7a is generated. Hereinafter, each of the devices 11 and 15 will be described in detail.
図5は、最初の処理部たる外装シート生成処理部10の概略側面図である。
この処理部10では、加工装置11と接合装置15とを用いて、おむつ1の基材シート7aとして、MD方向に連続してなる外装シート7の連続シート7a(以下では、単に外装シート7aと言う)を生成する。
すなわち、前者の加工装置11では、外層シート9となる低伸長性シート9の連続シート9a(以下では、単に「低伸長性シート9a」と言う)をMD方向に沿って搬送しながら、同シート9aに対して前述の第1部分9a1と第2部分9a2とをMD方向に交互に形成する(「準備すること」に相当)。
一方、後者の接合装置15では、伸縮方向をMD方向に沿わせて搬送される内層シート8たる伸縮性シート8の連続シート8a(以下では、単に「伸縮性シート8a」と言う)を、略自然長の状態から所定の伸長倍率までMD方向に伸長し、この伸長状態で同シート8aに上記の低伸長性シート9aを厚さ方向から重ね合わせて接合する(「固定すること」に相当)。そして、これにより、外装シート7aが生成される。以下、各装置11,15について詳しく説明する。 (1) Exterior sheet
FIG. 5 is a schematic side view of the exterior sheet
In this
That is, in the
On the other hand, in the latter joining
(1)-1 加工装置11
図6は、一部を拡大して示す加工装置11の概略側面図である。また、図7は、図6中のVII-VII矢視図である。
図6に示すように、加工装置11は、MD方向に沿って低伸長性シート9aを搬送する搬送機構12と、波形ロール機構13と、を有する。
搬送機構12は、例えば、CD方向に沿った回転軸回りに回転する複数の搬送ローラー12R,12R…を有し、各搬送ローラー12Rは、それぞれ低伸長性シート9aの搬送経路に沿って配されている。また、各搬送ローラー12Rの周速値V12R(m/分)は、上流工程から搬送される低伸長性シート9aの搬送速度値(m/分)と概ね同値とされている。そして、これにより、当該搬送機構12では、低伸長性シート9aを概ね伸長せずに且つ弛まない程度に張った状態で搬送する。 (1) -1Processing device 11
FIG. 6 is a schematic side view of theprocessing apparatus 11 shown partially enlarged. FIG. 7 is a view taken along arrow VII-VII in FIG.
As illustrated in FIG. 6, theprocessing apparatus 11 includes a transport mechanism 12 that transports the low-extensible sheet 9 a along the MD direction, and a corrugated roll mechanism 13.
Thetransport mechanism 12 has, for example, a plurality of transport rollers 12R, 12R,... That rotate around a rotation axis along the CD direction, and each transport roller 12R is disposed along the transport path of the low-extensible sheet 9a. ing. Further, the peripheral speed value V12R (m / min) of each conveying roller 12R is substantially the same as the conveying speed value (m / min) of the low-extensible sheet 9a conveyed from the upstream process. As a result, the transport mechanism 12 transports the low-extensible sheet 9a in a state in which the low-stretch sheet 9a is stretched so as not to stretch and to loosen.
図6は、一部を拡大して示す加工装置11の概略側面図である。また、図7は、図6中のVII-VII矢視図である。
図6に示すように、加工装置11は、MD方向に沿って低伸長性シート9aを搬送する搬送機構12と、波形ロール機構13と、を有する。
搬送機構12は、例えば、CD方向に沿った回転軸回りに回転する複数の搬送ローラー12R,12R…を有し、各搬送ローラー12Rは、それぞれ低伸長性シート9aの搬送経路に沿って配されている。また、各搬送ローラー12Rの周速値V12R(m/分)は、上流工程から搬送される低伸長性シート9aの搬送速度値(m/分)と概ね同値とされている。そして、これにより、当該搬送機構12では、低伸長性シート9aを概ね伸長せずに且つ弛まない程度に張った状態で搬送する。 (1) -1
FIG. 6 is a schematic side view of the
As illustrated in FIG. 6, the
The
一方、同図6に示すように、波形ロール機構13は、互いの外周面を対向させつつCD方向に沿った回転軸回りに回転する上下一対の波形ロール13u,13dを有している。そして、各波形ロール13u,13dの外周面には、それぞれ回転方向に沿って山部13mと谷部13vとが交互に形成されているとともに、各山部13m及び各谷部13vは、それぞれ、CD方向に延びて形成されている。また、図6中の拡大図に示すように、各波形ロール13u,13dが回転しているときには、一方の波形ロール13u(13d)の山部13mが他方の波形ロール13d(13u)の谷部13vに入り込むように互いの山部13mと谷部13vとが若干の隙間をもって噛み合うようになっている。そして、当該回転中に、波形ロール13u,13d同士の間を低伸長性シート9aがMD方向に沿って通される。
On the other hand, as shown in FIG. 6, the corrugated roll mechanism 13 includes a pair of upper and lower corrugated rolls 13 u and 13 d that rotate around the rotation axis along the CD direction with their outer peripheral surfaces facing each other. And in the outer peripheral surface of each corrugated roll 13u, 13d, while the peak part 13m and the trough part 13v are alternately formed along the rotation direction, respectively, each peak part 13m and each trough part 13v are respectively It extends in the CD direction. Moreover, as shown in the enlarged view in FIG. 6, when each corrugated roll 13u, 13d is rotating, the peak 13m of one corrugated roll 13u (13d) is the valley of the other corrugated roll 13d (13u). The mountain portions 13m and the valley portions 13v are engaged with each other with a slight gap so as to enter 13v. And during the rotation, the low-extensible sheet 9a is passed along the MD direction between the corrugated rolls 13u and 13d.
よって、当該通過中の低伸長性シート9aは、一方の波形ロール13d(13u)において互いに隣り合う山部13m,13m同士と、当該山部13m,13m同士の間の谷部13vに入り込む他方の波形ロール13u(13d)の山部13mとによって、三点曲げ状に変形される(図6)。そして、このときには、低伸長性シート9aにおいて一方の波形ロール13d(13u)の山部13mの頂面と当接する部分9a2は、当該頂面に概ね相対移動不能に当接して、これにより、概ね延伸されずに前述の第2部分9a2となり、また、同じく、同シート9aにおいて他方の波形ロール13u(13d)の山部13mの頂面と当接する部分9a2も、当該頂面に概ね相対移動不能に当接して、これにより、概ね延伸されずに前述の第2部分9a2となる。しかし、これら二つの第2部分9a2,9a2同士の間の部分9a1は、上述の山部13mの入り込みに基づいて延伸されて、これにより、当該部分9a1は、前述の第1部分9a1となる。そして、その結果、低伸長性シート9aには、第1部分9a1と第2部分9a2とがMD方向に交互に形成されて、しかる後に、同シート9aは、搬送ローラー12Rによって、張った状態で接合装置15へ送られる。
Therefore, the low-extensible sheet 9a that is passing is in the other corrugated roll 13d (13u), the other ridges 13m, 13m adjacent to each other and the valley 13v between the ridges 13m, 13m. The corrugated roll 13u (13d) is deformed into a three-point bend by the crest 13m (FIG. 6). At this time, the portion 9a2 that contacts the top surface of the peak portion 13m of one of the corrugated rolls 13d (13u) in the low-extension sheet 9a is in contact with the top surface so as to be relatively unmovable. Similarly, the second portion 9a2 is not stretched, and the portion 9a2 that is in contact with the top surface of the peak portion 13m of the other corrugated roll 13u (13d) in the sheet 9a is also generally immovable relative to the top surface. Thus, the second portion 9a2 is formed without being substantially stretched. However, the portion 9a1 between the two second portions 9a2 and 9a2 is stretched based on the above-described intrusion of the mountain portion 13m, so that the portion 9a1 becomes the above-described first portion 9a1. As a result, the first portion 9a1 and the second portion 9a2 are alternately formed in the MD direction on the low-extension sheet 9a, and then the sheet 9a is stretched by the conveying roller 12R. It is sent to the joining device 15.
なお、当然ながら、谷部13vの回転方向の形成ピッチPv(山部13mの頂面に相当する位置でのピッチPv)は、山部13mの回転方向の形成ピッチPm(山部13mの頂面でのピッチPm)と同値であり、また、山部13mの形成ピッチPmは、上下の波形ロール13u,13d同士で互いに同値である。更に、この例では、これら一対の波形ロール13u,13d同士は、一方のロール13d(13u)において回転方向に隣り合う山部13mと山部13mとの間の中間位置に、他方のロール13u(13d)の山部13mの回転方向の中央位置が位置するようにしながら回転する。よって、図3に示すように、上記の第2部分9a2は、MD方向に所定の形成ピッチP9a2で形成される。
Of course, the formation pitch Pv in the rotation direction of the valley portion 13v (pitch Pv at a position corresponding to the top surface of the peak portion 13m) is equal to the formation pitch Pm in the rotation direction of the peak portion 13m (the top surface of the peak portion 13m). And the formation pitch Pm of the crest 13m is equal to each other between the upper and lower corrugated rolls 13u and 13d. Further, in this example, the pair of corrugated rolls 13u and 13d are arranged at the intermediate position between the crest 13m and crest 13m adjacent to each other in the rotation direction of the other roll 13d (13u). It rotates while the center position of the rotational direction of the peak 13m of 13d is located. Therefore, as shown in FIG. 3, the second portion 9a2 is formed at a predetermined formation pitch P9a2 in the MD direction.
かかる山部13mの回転方向の形成ピッチPmは、例えば0.5mm~3.0mmの範囲から任意値が選択され、望ましくは0.7mm~2.0mmの範囲の任意値にされていると良く、更に望ましくは1.0mm~1.5mmの範囲の任意値にされていると良い。そして、かかる範囲に入っていれば、見た目に心地良い大きさの皺を外層シート9aに形成することができる。
As the formation pitch Pm in the rotation direction of the peak portion 13m, for example, an arbitrary value is selected from a range of 0.5 mm to 3.0 mm, and preferably an arbitrary value within a range of 0.7 mm to 2.0 mm. More desirably, the value is set to an arbitrary value in the range of 1.0 mm to 1.5 mm. And if it is in such a range, the wrinkle of the size comfortable to an eye can be formed in outer layer sheet 9a.
ところで、この例では、図7に示すように、一対の波形ロール13u,13dのうちの一方の波形ロール13uの山部13mを、CD方向(「所定方向と交差する方向」及び「回転軸に沿う方向」に相当)の所定位置Pk,Pk…で切り欠いている。そして、これにより、山部13mは非連続に設けられているが、この理由は次の通りである。
先ず、この例では、低伸長性シート9aとしてPP繊維の不織布を使用しているために、必ずしも山部13mを部分的に切り欠く必要はなく、つまり、山部13mを全く切り欠いていない一対の波形ロール13u,13dを用いても、低伸長性シート9aの伸縮性を発現させてしまうことは概ね無い。よって、第1部分9a1及び第2部分9a2の形成後も、低伸長性シート9aは、相変わらず伸長性の低い状態を維持することができて、つまり、伸長性の低いシートとして機能することができる。
しかし、場合によっては、低伸長性シート9aとして、PP繊維に加えて適宜なエラストマー製繊維を含むシートを用いることもあり得る。そして、その場合に、切り欠きの無いCD方向の全長に亘って完全に連続した山部13mの波形ロール13u,13dを用いると、同シート9aが伸縮性を発現してしまって、その結果、伸長性の低い状態を維持できなくなる。
すなわち、上記の三点曲げ状の延伸処理によって、同シート9a中の略非弾性のPP繊維が塑性変形すると、伸びきったPP繊維は、エラストマー製繊維の略弾性的な伸縮変形を阻害し得ない状態になる。すると、以降、同シート9aは、概ねエラストマー製繊維のみに基づいて自在に伸縮変形し得る状態となってしまい、つまり、伸縮性が発現した状態になってしまう。 By the way, in this example, as shown in FIG. 7, thepeak portion 13m of one corrugated roll 13u of the pair of corrugated rolls 13u, 13d is placed in the CD direction ("direction intersecting a predetermined direction" and "rotating axis"). Are cut out at predetermined positions Pk, Pk. As a result, the peaks 13m are discontinuously provided for the following reason.
First, in this example, since a non-woven fabric of PP fiber is used as the low-extension sheet 9a, it is not always necessary to partially cut out the peak portion 13m, that is, a pair in which the peak portion 13m is not cut out at all. Even when the corrugated rolls 13u and 13d are used, the stretchability of the low-extension sheet 9a is hardly exhibited. Therefore, even after the formation of the first portion 9a1 and the second portion 9a2, the low-extension sheet 9a can maintain the state of low extensibility as usual, that is, can function as a sheet with low extensibility. .
However, in some cases, as the low-extension sheet 9a, a sheet containing an appropriate elastomer fiber in addition to the PP fiber may be used. And in that case, if the corrugated rolls 13u and 13d of the crest 13m that is completely continuous over the entire length in the CD direction without notches are used, the sheet 9a has developed elasticity, and as a result, The state of low extensibility cannot be maintained.
That is, when the substantially inelastic PP fiber in thesheet 9a is plastically deformed by the above three-point bending-shaped stretching process, the stretched PP fiber can inhibit the substantially elastic stretching deformation of the elastomer fiber. No state. Then, thereafter, the sheet 9a is in a state where it can be freely stretched and deformed based only on the elastomer fibers, that is, in a state where stretchability is exhibited.
先ず、この例では、低伸長性シート9aとしてPP繊維の不織布を使用しているために、必ずしも山部13mを部分的に切り欠く必要はなく、つまり、山部13mを全く切り欠いていない一対の波形ロール13u,13dを用いても、低伸長性シート9aの伸縮性を発現させてしまうことは概ね無い。よって、第1部分9a1及び第2部分9a2の形成後も、低伸長性シート9aは、相変わらず伸長性の低い状態を維持することができて、つまり、伸長性の低いシートとして機能することができる。
しかし、場合によっては、低伸長性シート9aとして、PP繊維に加えて適宜なエラストマー製繊維を含むシートを用いることもあり得る。そして、その場合に、切り欠きの無いCD方向の全長に亘って完全に連続した山部13mの波形ロール13u,13dを用いると、同シート9aが伸縮性を発現してしまって、その結果、伸長性の低い状態を維持できなくなる。
すなわち、上記の三点曲げ状の延伸処理によって、同シート9a中の略非弾性のPP繊維が塑性変形すると、伸びきったPP繊維は、エラストマー製繊維の略弾性的な伸縮変形を阻害し得ない状態になる。すると、以降、同シート9aは、概ねエラストマー製繊維のみに基づいて自在に伸縮変形し得る状態となってしまい、つまり、伸縮性が発現した状態になってしまう。 By the way, in this example, as shown in FIG. 7, the
First, in this example, since a non-woven fabric of PP fiber is used as the low-
However, in some cases, as the low-
That is, when the substantially inelastic PP fiber in the
そこで、この例では、波形ロール機構13の通過後に起こり得る上記の伸縮性の発現を、如何なる組成の低伸長性シート9aに対しても抑制する目的で、図7に示すように、一対の波形ロール13u,13dのうちの一方の波形ロール13uの山部13mをCD方向の所定位置Pk,Pk…で切り欠いて、これにより当該山部13mを非連続に設けている。すなわち、このようにしていれば、当該所定位置Pkでは山部13mが存在しなくなるために、同位置Pkでは上記の三点曲げ状の延伸処理は行われず、結果、少なくとも当該位置Pkでは伸縮性が発現せずに、低伸長性シート9aの伸縮性の発現は全体として抑制されることになる。
ちなみに、もう一方の波形ロール13dについては、図7に示すように山部13mをCD方向に亘って連続して設けても良いが、非連続に設けても良い。但し、山部13mを連続して設けた方が、山部13mを非連続にするための加工を施さずに済むので、コスト削減を図れて好ましい。 Therefore, in this example, as shown in FIG. 7, a pair of corrugated waves is used for the purpose of suppressing the expression of the stretchability that may occur after passing through thecorrugated roll mechanism 13 with respect to the low stretchable sheet 9a of any composition. The peak portion 13m of one of the corrugated rolls 13u of the rolls 13u and 13d is cut out at predetermined positions Pk, Pk... In the CD direction, thereby providing the peak portions 13m discontinuously. That is, in this case, the peak portion 13m does not exist at the predetermined position Pk, and thus the above three-point bend-shaped stretching process is not performed at the same position Pk. As a result, at least the position Pk is stretchable. Is not expressed, and the stretchable expression of the low-extensible sheet 9a is suppressed as a whole.
Incidentally, as for the othercorrugated roll 13d, as shown in FIG. 7, the peak portions 13m may be provided continuously over the CD direction, but may be provided discontinuously. However, it is preferable to provide the peak portions 13m continuously because it is not necessary to perform processing for making the peak portions 13m discontinuous.
ちなみに、もう一方の波形ロール13dについては、図7に示すように山部13mをCD方向に亘って連続して設けても良いが、非連続に設けても良い。但し、山部13mを連続して設けた方が、山部13mを非連続にするための加工を施さずに済むので、コスト削減を図れて好ましい。 Therefore, in this example, as shown in FIG. 7, a pair of corrugated waves is used for the purpose of suppressing the expression of the stretchability that may occur after passing through the
Incidentally, as for the other
また、望ましくは、上下一対の波形ロール13u,13dのうちの少なくとも一方又は両方の波形ロール13u,13dに、ヒーターを内蔵して、これにより、波形ロール13u,13dの山部13mの温度を調整しても良い。そして、このようにすれば、山部13mの加熱によって低伸長性シート9aは軟化するので、延伸時に起こり得る第2部分9a2の破断を有効に防ぐことができる。なお、加熱温度の調整の目安としては、山部13mの温度が25℃~40℃の範囲の任意値を例示できる。
Desirably, a heater is incorporated in at least one of the pair of upper and lower corrugated rolls 13u and 13d, thereby adjusting the temperature of the peak portion 13m of the corrugated rolls 13u and 13d. You may do it. And if it does in this way, since the low extension sheet | seat 9a softens by the heating of the peak part 13m, the fracture | rupture of the 2nd part 9a2 which may occur at the time of extending | stretching can be prevented effectively. As an indication for adjusting the heating temperature, an arbitrary value in which the temperature of the peak portion 13 m is in the range of 25 to 40 ° C. can be exemplified.
更に、場合によっては、上記と同じ目的で、図5に示すように、波形ロール機構13よりもMD方向の上流側の位置に予熱ロール14a,14bを配置しても良い。予熱ロール14a,14bも、CD方向に沿った回転軸回りに回転するローラーであるが、同ローラー14a,14bの内部には、ヒーターが設けられており、同ヒーターによってローラー14a,14bの外周面を加熱可能である。そして、低伸長性シート9aは、予熱ロール14a,14bの外周面に巻き付いた状態で同ロール14a,14bが回転することによって、MD方向に搬送されるが、この巻き付いている間に、低伸長性シート9aは加熱される。加熱温度の調整の目安としては、同ロール14a,14bの外周面の温度が25℃~40℃の範囲の任意値を例示できる。なお、この図5の例では、二つの予熱ローラー14a,14bが配置されていて、これら二つの予熱ローラー14a,14bの外周面に対して低伸長性シート9aはS字状に掛け回されているが、何等これに限らない。
Further, in some cases, for the same purpose as described above, as shown in FIG. 5, preheating rolls 14 a and 14 b may be disposed at a position upstream of the corrugated roll mechanism 13 in the MD direction. The preheating rolls 14a and 14b are also rollers that rotate around a rotation axis along the CD direction. A heater is provided inside the rollers 14a and 14b, and the outer peripheral surfaces of the rollers 14a and 14b are provided by the heater. Can be heated. The low-extensible sheet 9a is conveyed in the MD direction when the rolls 14a and 14b rotate in a state of being wound around the outer peripheral surfaces of the preheating rolls 14a and 14b. The conductive sheet 9a is heated. As an indication of the adjustment of the heating temperature, an arbitrary value in which the temperature of the outer peripheral surface of the rolls 14a and 14b is in the range of 25 ° C. to 40 ° C. can be exemplified. In the example of FIG. 5, two preheating rollers 14a and 14b are arranged, and the low-extensible sheet 9a is wound around in an S shape with respect to the outer peripheral surfaces of the two preheating rollers 14a and 14b. There is no limitation to this.
(1)-2 接合装置15
同図5に示すように、接合装置15は、ニップロール機構16と、同機構16よりもMD方向の下流に配された超音波溶着装置17と、を有する。そして、この接合装置15では、上流工程から略自然長の状態で搬送される伸縮性シート8aを、ニップロール機構16と超音波溶着装置17との間で上記の伸長倍率までMD方向に伸長し、そして、この伸長状態を維持しながら、超音波溶着装置17によって同シート8aを、前述の波形ロール機構13から送られる低伸長性シート9aに溶着して接合する。 (1) -2Bonding device 15
As shown in FIG. 5, the joiningdevice 15 includes a nip roll mechanism 16 and an ultrasonic welding device 17 disposed downstream of the mechanism 16 in the MD direction. And in this joining device 15, the stretchable sheet 8a conveyed in an approximately natural length state from the upstream process is stretched in the MD direction between the nip roll mechanism 16 and the ultrasonic welding device 17 up to the stretch magnification described above, Then, while maintaining this stretched state, the ultrasonic welding device 17 welds and joins the sheet 8 a to the low stretch sheet 9 a fed from the corrugated roll mechanism 13.
同図5に示すように、接合装置15は、ニップロール機構16と、同機構16よりもMD方向の下流に配された超音波溶着装置17と、を有する。そして、この接合装置15では、上流工程から略自然長の状態で搬送される伸縮性シート8aを、ニップロール機構16と超音波溶着装置17との間で上記の伸長倍率までMD方向に伸長し、そして、この伸長状態を維持しながら、超音波溶着装置17によって同シート8aを、前述の波形ロール機構13から送られる低伸長性シート9aに溶着して接合する。 (1) -2
As shown in FIG. 5, the joining
ニップロール機構16は、CD方向に沿った回転軸回りに回転する一対のニップロール16R,16Rを有する。そして、上流工程から連続して搬送される伸縮性シート8aを、一対のニップロール16R,16Rが互いの外周面で挟み込みながら、駆動源としてのサーボモータ(不図示)から駆動力を付与されて駆動回転することにより、同シート8aをニップロール16R,16Rの周速値V16Rと概ね同値の搬送速度値でもって超音波溶着装置17へと送り出す。
The nip roll mechanism 16 has a pair of nip rolls 16R and 16R that rotate around a rotation axis along the CD direction. The elastic sheet 8a continuously conveyed from the upstream process is driven with a driving force applied from a servo motor (not shown) as a driving source while the pair of nip rolls 16R and 16R are sandwiched between the outer peripheral surfaces. By rotating, the sheet 8a is sent to the ultrasonic welding device 17 with a conveyance speed value substantially equal to the peripheral speed value V16R of the nip rolls 16R and 16R.
一方、超音波溶着装置17は、例えば20kHz~35kHzの所定周波数且つ1ミクロン~30ミクロンの所定振幅で法線方向に振動する振動面17hsを有したホーン17hと、ホーン17hの上記振動面17hsの振動を外周面で受けるアンビルローラー17aと、を有する。アンビルローラー17aは、CD方向に沿った回転軸回りに回転可能に支持されており、そして、駆動源としてのサーボモータ(不図示)から駆動力を付与されて駆動回転する。また、アンビルローラー17aの外周面には、波形ロール機構13から送られる低伸長性シート9aと、ニップロール機構16から送られる伸縮性シート8aとの両者が、同外周面に対して概ね相対滑り無く例えば45°以上の巻き付き角度で巻き付いている。
よって、アンビルローラー17aが駆動回転することによって、アンビルローラー17aの周速値V17aと同じ搬送速度値V8a9aで、伸縮性シート8aと低伸長性シート9aとの両者は、同ローラー17aの外周面に沿って搬送される。
なお、かかる搬送速度値V8a9aは、前述のように、ニップロール機構16のニップロール16Rの周速値V16Rの伸長倍率倍の大きさである。よって、伸縮性シート8aについては、上記の伸長倍率まで伸長されてアンビルローラー17aの外周面に巻き付く。一方、同搬送速度値V8a9aは、低伸長性シート9aの搬送ローラー12Rの周速値V12Rと概ね同値である。よって、低伸長性シート9aについては、概ね伸長せずに、しかも弛まない程度に張った状態でアンビルローラー17aの外周面に巻き付く。 On the other hand, theultrasonic welding device 17 includes a horn 17h having a vibration surface 17hs that vibrates in a normal direction with a predetermined frequency of 20 kHz to 35 kHz and a predetermined amplitude of 1 to 30 microns, and the vibration surface 17hs of the horn 17h. An anvil roller 17a that receives vibrations on the outer peripheral surface. The anvil roller 17a is supported so as to be rotatable around a rotation axis along the CD direction, and is driven to rotate by being applied with a driving force from a servo motor (not shown) as a driving source. Further, on the outer peripheral surface of the anvil roller 17a, both the low stretch sheet 9a sent from the corrugated roll mechanism 13 and the stretchable sheet 8a sent from the nip roll mechanism 16 have almost no relative slip with respect to the outer peripheral surface. For example, it is wound at a winding angle of 45 ° or more.
Therefore, when theanvil roller 17a is driven to rotate, both the stretchable sheet 8a and the low-extensible sheet 9a have the same conveying speed value V8a9a as the peripheral speed value V17a of the anvil roller 17a. Conveyed along.
Note that the transport speed value V8a9a is as large as the expansion magnification times the peripheral speed value V16R of thenip roll 16R of the nip roll mechanism 16 as described above. Therefore, the stretchable sheet 8a is stretched to the above-described stretch ratio and is wound around the outer peripheral surface of the anvil roller 17a. On the other hand, the transport speed value V8a9a is substantially the same as the peripheral speed value V12R of the transport roller 12R of the low-extensible sheet 9a. Therefore, the low-extensible sheet 9a is wound around the outer peripheral surface of the anvil roller 17a in a state in which the low-extensible sheet 9a is not stretched and is not loosened.
よって、アンビルローラー17aが駆動回転することによって、アンビルローラー17aの周速値V17aと同じ搬送速度値V8a9aで、伸縮性シート8aと低伸長性シート9aとの両者は、同ローラー17aの外周面に沿って搬送される。
なお、かかる搬送速度値V8a9aは、前述のように、ニップロール機構16のニップロール16Rの周速値V16Rの伸長倍率倍の大きさである。よって、伸縮性シート8aについては、上記の伸長倍率まで伸長されてアンビルローラー17aの外周面に巻き付く。一方、同搬送速度値V8a9aは、低伸長性シート9aの搬送ローラー12Rの周速値V12Rと概ね同値である。よって、低伸長性シート9aについては、概ね伸長せずに、しかも弛まない程度に張った状態でアンビルローラー17aの外周面に巻き付く。 On the other hand, the
Therefore, when the
Note that the transport speed value V8a9a is as large as the expansion magnification times the peripheral speed value V16R of the
そして、これにより、伸長倍率まで伸長された伸縮性シート8aと、張った状態にされた低伸長性シート9aとが、アンビルローラー17aの外周面上で互いに厚さ方向に重ね合わせられるとともに、当該重ね合わせられた状態において、アンビルローラー17aの回転によって、これらシート8a,9aがホーン17hの配置位置を通過する際に、同シート8a,9aにはホーン17hの振動面17hsから超音波振動エネルギーが投入されて発熱して溶融し、これにより、前述したような複数の接合部j,j…が非連続に分散した接合パターンで両シート8a、9aが接合されて、外装シート7aが生成される。そして、かかる外装シート7aを、アンビルローラー17aはMD方向の下流へと送り出し、これにより、送り出された外装シート7aは、当該周速値V17aと概ね同値の搬送速度値V8a9aでMD方向の下流の脚回り開口部形成処理部20へと搬送される。
And thereby, the stretchable sheet 8a stretched to the stretch magnification and the stretchable low stretchable sheet 9a are superposed on each other in the thickness direction on the outer peripheral surface of the anvil roller 17a, and When the sheets 8a and 9a pass through the arrangement position of the horn 17h by the rotation of the anvil roller 17a in the superposed state, ultrasonic vibration energy is applied to the sheets 8a and 9a from the vibration surface 17hs of the horn 17h. Then, the sheets 8a and 9a are joined in a joining pattern in which a plurality of joining portions j, j... Are discontinuously dispersed as described above, and the exterior sheet 7a is generated. . Then, the exterior sheet 7a is sent to the downstream in the MD direction by the anvil roller 17a, so that the delivered exterior sheet 7a has a conveyance speed value V8a9a substantially equal to the peripheral speed value V17a and downstream in the MD direction. It is conveyed to the leg hole opening forming processing unit 20.
なお、この例では、ホーン17hの振動面17hsは、振動方向を法線方向とする平面とされている。一方、アンビルローラー17aの外周面には、上述の接合パターンで接合部j,j…を形成すべく、上記接合パターンに対応した配置パターンで複数の突部17at,17at…が配置されている(図8のアンビルローラー17aの外周面を回転方向に展開して示す拡大図を参照)。そして、低伸長性シート9aにおいて上記突部17atの頂面と当接する部分に、ホーン17hの振動面17hsが選択的に当たることによって、超音波振動エネルギーが投入されて溶融し、これにより、各突部17atの頂面に対応する位置にそれぞれ接合部j,j…が形成される。また、この例では、接合パターンは、既述のように千鳥パターンであることから(図3)、図8に示すように、アンビルローラー17aの外周面にも、上記の複数の突部17at,17at…が千鳥パターンで設けられている。更に、横流れ搬送であることから、おむつ1の幅方向が、MD方向及びアンビルローラー17aの回転方向に沿っている。
In this example, the vibration surface 17hs of the horn 17h is a plane whose normal direction is the vibration direction. On the other hand, on the outer peripheral surface of the anvil roller 17a, a plurality of protrusions 17at, 17at,... Are arranged in an arrangement pattern corresponding to the joining pattern in order to form the joints j, j,. (Refer to the enlarged view showing the outer peripheral surface of the anvil roller 17a in FIG. 8 developed in the rotational direction). Then, when the vibration surface 17hs of the horn 17h selectively hits the portion of the low-extensible sheet 9a that contacts the top surface of the protrusion 17at, ultrasonic vibration energy is input and melted. .. Are formed at positions corresponding to the top surface of the portion 17at. Further, in this example, since the joining pattern is a staggered pattern as described above (FIG. 3), as shown in FIG. 8, the plurality of protrusions 17at, 17at ... are provided in a staggered pattern. Furthermore, since it is a transverse flow conveyance, the width direction of the diaper 1 is along the MD direction and the rotation direction of the anvil roller 17a.
そのため、前述した低伸長性シート9aの非接合部jnに、同シート9aの第1部分9a1の幅方向の中央位置C9a1と第2部分9a2の幅方向の中央位置C9a2とが少なくとも一つずつ含まれるという関係(図3)は、MD方向に関して成立するように、各突部17at,17at…が配置されている。例えば、この例では、上記の関係が成立するように、図3の非接合部jnのMD方向の長さLjnの方が、同シート9aにおける第2部分9a2の形成ピッチP9a2よりも大きくなるように、各突部17at,17at…が配置されている。すなわち、図8の例では、突部17at,17at同士の間に位置する突部17atの非存在部分17anのMD方向の長さL17anが、上述の第2部分9a2の形成ピッチP9a2(図3)よりも大きくなっている。
Therefore, at least one center position C9a1 in the width direction of the first portion 9a1 of the sheet 9a and a center position C9a2 in the width direction of the second portion 9a2 are included in the non-joining portion jn of the low-extension sheet 9a. The protrusions 17at, 17at,... Are arranged so that the relationship (FIG. 3) is established in the MD direction. For example, in this example, the length Ljn in the MD direction of the non-joining portion jn in FIG. 3 is larger than the formation pitch P9a2 of the second portion 9a2 in the sheet 9a so that the above relationship is established. Further, each of the protrusions 17at, 17at ... is arranged. That is, in the example of FIG. 8, the length L17an in the MD direction of the non-existing portion 17an of the protrusion 17at located between the protrusions 17at and 17at is the formation pitch P9a2 of the above-described second portion 9a2 (FIG. 3). Is bigger than.
よって、かかる接合後に、伸縮性シート8aの伸長状態が解除されれば、上記の第1部分9a1と第2部分9a2との剛性差に基づいて、低伸長性シート9aにおける各非接合部jnは速やかに座屈して、その結果、当該非接合部jn毎に確実に皺が寄って、全体として外層シート9aの見栄えが良好となる。
Therefore, if the stretched state of the stretchable sheet 8a is released after such joining, each non-joined part jn in the low stretchable sheet 9a is based on the rigidity difference between the first part 9a1 and the second part 9a2. As a result, it buckles quickly, and as a result, the non-joint portion jn is surely wrinkled and the appearance of the outer layer sheet 9a is improved as a whole.
ちなみに、この例では、図3に示すように、非接合部jnの長さLjnを、第2部分9a2の形成ピッチP9a2の2倍の大きさ以下としているが、何等これに限らない。
例えば、第2部分9a1のMD方向の形成ピッチP9a2の複数倍の大きさよりも、非接合部jnのMD方向の長さLjnを大きくしても良い。そして、このようにすれば、第1部分9a1のMD方向の中央位置C9a1と第2部分9a2のMD方向の中央位置C9a2とが、それぞれ、複数個ずつ非接合部jnに含まるようになる。そして、これにより、非接合部jnのうちでMD方向の複数の位置に剛性差が生じるため、低伸長性シート9aにおける非接合部jnは、複数の位置で速やかに座屈し得て、その結果、当該非接合部jnには、より多くの皺が寄るようになる。 Incidentally, in this example, as shown in FIG. 3, the length Ljn of the non-joining portion jn is set to be not more than twice the formation pitch P9a2 of the second portion 9a2, but this is not restrictive.
For example, the length Ljn in the MD direction of the non-joining part jn may be made larger than the multiple of the formation pitch P9a2 in the MD direction of the second portion 9a1. In this way, the center position C9a1 in the MD direction of the first portion 9a1 and the center position C9a2 in the MD direction of the second portion 9a2 are each included in the non-joint portion jn. As a result, a difference in rigidity occurs at a plurality of positions in the MD direction among the non-joining portions jn, and thus the non-joining portions jn in thelow stretch sheet 9a can be buckled quickly at the plurality of positions, and as a result. More wrinkles come to the non-joining part jn.
例えば、第2部分9a1のMD方向の形成ピッチP9a2の複数倍の大きさよりも、非接合部jnのMD方向の長さLjnを大きくしても良い。そして、このようにすれば、第1部分9a1のMD方向の中央位置C9a1と第2部分9a2のMD方向の中央位置C9a2とが、それぞれ、複数個ずつ非接合部jnに含まるようになる。そして、これにより、非接合部jnのうちでMD方向の複数の位置に剛性差が生じるため、低伸長性シート9aにおける非接合部jnは、複数の位置で速やかに座屈し得て、その結果、当該非接合部jnには、より多くの皺が寄るようになる。 Incidentally, in this example, as shown in FIG. 3, the length Ljn of the non-joining portion jn is set to be not more than twice the formation pitch P9a2 of the second portion 9a2, but this is not restrictive.
For example, the length Ljn in the MD direction of the non-joining part jn may be made larger than the multiple of the formation pitch P9a2 in the MD direction of the second portion 9a1. In this way, the center position C9a1 in the MD direction of the first portion 9a1 and the center position C9a2 in the MD direction of the second portion 9a2 are each included in the non-joint portion jn. As a result, a difference in rigidity occurs at a plurality of positions in the MD direction among the non-joining portions jn, and thus the non-joining portions jn in the
なお、この例では、図8に示すように、アンビルローラー17aの突部17atの頂面の平面形状として正方形を例示したが、何等これに限らない。例えば正五角形以上の正多角形でも良いし、正円形でも良いし、これら以外の形状でも良い。
In addition, in this example, as shown in FIG. 8, although the square was illustrated as a planar shape of the top surface of the protrusion 17at of the anvil roller 17a, it is not limited to this. For example, it may be a regular polygon of a regular pentagon or more, a regular circle, or a shape other than these.
また、図5に示すように、この例では、アンビルローラー17a(「一方の挟圧部材」に相当)の外周面に対向して低伸長性シート9aを配し、ホーン17h(「他方の挟圧部材」に相当)の振動面17hs(「面部」に相当)に対向して伸縮性シート8aを配していたが、何等これに限らず、逆にしても良い。すなわち、アンビルローラー17aの外周面に対向して伸縮性シート8aを配し、ホーン17hの振動面17hsに対向して低伸長性シート9aを配しても良い。但し、接合部jの接合強度の向上の観点からは、前者の方が好ましい。すなわち、前者たる本実施形態の構成によれば、先ず、伸縮性シート8aには、ホーン17hの振動面17hsが対向しており、そして、かかる振動面17hsの面積は、アンビルローラー17aの外周面の突部17atの頂面の面積よりも大きくされている。また、アンビルローラー17aの外周面の突部17atは低伸長性シート9aに対向して設けられており、これにより、突部17atは低伸長性シート9aを介して伸縮性シート8aを挟圧する。よって、突部17atの頂面によって伸縮性シート8aが局所的に薄く伸ばされて突き抜けてしまう事態は有効に抑制される。そして、これにより、突部17atの頂面に十分な量の伸縮性シート8aを残すことができる。一方、突部17at側に位置する低伸長性シート9aの伸長性は、伸縮性シート8aよりも低くなっている。よって、突部17atの頂面によって低伸長性シート9aが局所的に薄く伸ばされてしまう事態は有効に回避されて、これにより、突部17atの頂面に十分な量の低伸長性シート9aを残すことができる。そして、その結果、低伸長性シート9aと伸縮性シート8aとを高い接合強度で接合可能となる。
Further, as shown in FIG. 5, in this example, a low-extensible sheet 9a is arranged facing the outer peripheral surface of the anvil roller 17a (corresponding to “one clamping member”), and a horn 17h (“the other clamping member”) is arranged. Although the stretchable sheet 8a is disposed to face the vibration surface 17hs (corresponding to the “surface portion”) of the “pressure member”), the invention is not limited to this and may be reversed. That is, the stretchable sheet 8a may be disposed facing the outer peripheral surface of the anvil roller 17a, and the low-extensible sheet 9a may be disposed facing the vibration surface 17hs of the horn 17h. However, the former is preferable from the viewpoint of improving the joint strength of the joint j. That is, according to the configuration of the present embodiment as the former, first, the vibration surface 17hs of the horn 17h is opposed to the elastic sheet 8a, and the area of the vibration surface 17hs is the outer peripheral surface of the anvil roller 17a. It is made larger than the area of the top surface of the protrusion 17at. Moreover, the protrusion 17at of the outer peripheral surface of the anvil roller 17a is provided facing the low-extension sheet 9a, and thereby the protrusion 17at sandwiches the elastic sheet 8a via the low-extension sheet 9a. Therefore, the situation where the elastic sheet 8a is locally thinly stretched by the top surface of the protrusion 17at and effectively penetrates is effectively suppressed. Thus, a sufficient amount of the elastic sheet 8a can be left on the top surface of the protrusion 17at. On the other hand, the extensibility of the low extensibility sheet 9a located on the protrusion 17at side is lower than that of the elastic sheet 8a. Therefore, the situation where the low stretch sheet 9a is locally thinly stretched by the top surface of the protrusion 17at is effectively avoided, and thereby a sufficient amount of the low stretch sheet 9a on the top surface of the protrusion 17at. Can leave. As a result, the low-extensible sheet 9a and the stretchable sheet 8a can be bonded with high bonding strength.
更に、この例では、図5に示すように、伸縮性シート8aがホーン17hの振動面17hsから離れた後においても、当該伸縮性シート8aと低伸長性シート9aとが接合されてなる外装シート7aは、暫くの間、アンビルローラー17aに巻き付いた状態に維持されている。そして、これにより、外装シート7aのCD方向の収縮変形を有効に抑制している。ちなみに、同図5の例では、かかる巻き付けの実現を、MD方向の下流側の位置にアンビルローラー17aの外周面に対向して搬送ローラー18Rを配置することにより行っている。すなわち、アンビルローラー17aと搬送ローラー18Rとに対して外装シート7aをS字状に掛け回すことにより、振動面17hsよりもMD方向の下流側の位置においてもアンビルローラー17aへの外装シート7aの巻き付き状態を維持している。但し、何等これに限らない。
Furthermore, in this example, as shown in FIG. 5, the exterior sheet formed by joining the stretchable sheet 8a and the low stretchable sheet 9a even after the stretchable sheet 8a is separated from the vibration surface 17hs of the horn 17h. 7a is maintained in a state of being wound around the anvil roller 17a for a while. Thus, the shrinkage deformation in the CD direction of the exterior sheet 7a is effectively suppressed. Incidentally, in the example of FIG. 5, the winding is realized by disposing the transport roller 18R at the downstream position in the MD direction so as to face the outer peripheral surface of the anvil roller 17a. That is, the exterior sheet 7a is wound around the anvil roller 17a and the transport roller 18R in an S shape so that the exterior sheet 7a is wound around the anvil roller 17a even at a position downstream of the vibration surface 17hs in the MD direction. The state is maintained. However, it is not limited to this.
ところで、上述では、「低伸長性シート9aが張った状態にある」と述べたが、かかる張った状態においては、低伸長シート9aは、その低伸長性に基づいてこれ以上は伸長し難い状態たる所謂伸び止まり状態となっている。そのため、仮に以降の搬送中に想定外の大きな張力が作用した場合でも、外装シート7aのMD方向の長さが変化しないように当該低伸長性シート9aで上記張力に抗うことができる。よって、この後に外装シート7aに対してなされる脚回り開口部7HLの形成処理を高い位置精度で行うことができる。ちなみに、かかる「伸び止まり状態」を仮に定義するとすれば、例えば、「シートが破損していない状態であって、しかも、シートの状態を保ちつつ、当該現時点の状態から更に伸び率で5%以上伸長することはない状態」と言うことができる。
By the way, in the above description, “the low-extensible sheet 9a is in a stretched state” is described. However, in such a stretched state, the low-extension sheet 9a is in a state in which it is difficult to extend any more based on the low stretchability. That is, it is in a so-called non-elongation state. Therefore, even if an unexpectedly large tension acts during the subsequent conveyance, the low-stretch sheet 9a can resist the tension so that the length of the exterior sheet 7a in the MD direction does not change. Therefore, the formation process of the leg opening 7HL that is performed on the exterior sheet 7a thereafter can be performed with high positional accuracy. By the way, if such a “non-stretched state” is defined, for example, “the sheet is not damaged, and further, the sheet is kept in a state of being stretched further by 5% or more from the current state. It can be said that the state does not expand.
また、上述の「伸長倍率」とは、伸長状態の伸縮性シート8aの全長が、伸長前の自然長の何倍まで伸びているかを示すものであり、そして、かかる伸長倍率は、完成状態のおむつ1における外装シート7(7a)が無負荷状態から幅方向にどれだけ伸長可能かを規定するものである。つまり、伸縮性シート8aが所定の伸長倍率に設定されて製造されたおむつ1にあっては、当該伸長倍率に相当する伸長状態まで外装シート7(7a)はおむつ1の幅方向に伸長することができる。かかる伸長倍率は、例えば、1.5倍~4倍の範囲の任意値に設定され、この例では、伸長倍率は2.5倍に設定されている。なお、以下では、この外装シート生成処理部10で設定された伸長倍率まで伸縮性シート8aが伸長された状態のことを「第1の伸長状態」と言う。
Moreover, the above-mentioned “stretching magnification” indicates how many times the total length of the stretchable elastic sheet 8a is stretched to the natural length before stretching, and the stretching magnification is the completed state. It defines how much the exterior sheet 7 (7a) in the diaper 1 can be extended in the width direction from the unloaded state. That is, in the diaper 1 manufactured by setting the stretchable sheet 8a to a predetermined stretch magnification, the exterior sheet 7 (7a) is stretched in the width direction of the diaper 1 until the stretched state corresponds to the stretch magnification. Can do. The expansion magnification is set to an arbitrary value in the range of 1.5 to 4 times, for example, and in this example, the expansion magnification is set to 2.5 times. Hereinafter, the state in which the stretchable sheet 8a is stretched to the stretch magnification set by the exterior sheet generation processing unit 10 is referred to as a “first stretched state”.
(2)脚回り開口部形成処理部20
次の脚回り開口部形成処理部20でも、外装シート7aの伸長状態は、上述の第1の伸長状態に維持されている。そして、図4A及び図4Bに示すように、当該脚回り開口部形成処理部20では、この第1の伸長状態で搬送される外装シート7aに対して、所定の第1ピッチP1で脚回り開口部7HLを打ち抜いて形成する。
ここで、かかる第1ピッチP1は、第1の伸長状態におけるMD方向のおむつ1の一つ分の長さに相当している。よって、外装シート7aには、おむつ1となる部分毎に脚回り開口部7HLが一つずつ形成される。ちなみに、このおむつ1の一つ分の長さは、外装シート7aの伸長状態に応じて変化する。例えば、伸長状態が緩和されて外装シート7aが収縮すれば、その収縮分だけ、MD方向のおむつ1の一つ分の長さは短くなる。 (2) Leg openingformation processing unit 20
Even in the next leg-hole openingformation processing unit 20, the extended state of the exterior sheet 7a is maintained in the first extended state described above. Then, as shown in FIGS. 4A and 4B, in the leg opening formation processing unit 20, the leg opening is formed at a predetermined first pitch P <b> 1 with respect to the exterior sheet 7 a conveyed in the first extended state. The part 7HL is formed by punching.
Here, the first pitch P1 corresponds to the length of one diaper 1 in the MD direction in the first extended state. Therefore, one leg opening 7HL is formed in theexterior sheet 7a for each part that becomes the diaper 1. Incidentally, the length of one diaper 1 changes according to the extended state of the exterior sheet 7a. For example, when the stretched state is relaxed and the exterior sheet 7a contracts, the length of one diaper 1 in the MD direction is shortened by the contraction.
次の脚回り開口部形成処理部20でも、外装シート7aの伸長状態は、上述の第1の伸長状態に維持されている。そして、図4A及び図4Bに示すように、当該脚回り開口部形成処理部20では、この第1の伸長状態で搬送される外装シート7aに対して、所定の第1ピッチP1で脚回り開口部7HLを打ち抜いて形成する。
ここで、かかる第1ピッチP1は、第1の伸長状態におけるMD方向のおむつ1の一つ分の長さに相当している。よって、外装シート7aには、おむつ1となる部分毎に脚回り開口部7HLが一つずつ形成される。ちなみに、このおむつ1の一つ分の長さは、外装シート7aの伸長状態に応じて変化する。例えば、伸長状態が緩和されて外装シート7aが収縮すれば、その収縮分だけ、MD方向のおむつ1の一つ分の長さは短くなる。 (2) Leg opening
Even in the next leg-hole opening
Here, the first pitch P1 corresponds to the length of one diaper 1 in the MD direction in the first extended state. Therefore, one leg opening 7HL is formed in the
かかる脚回り開口部7HLの形成処理は、ダイカッター装置21によってなされる。ダイカッター装置21は、外周面を対向させつつCD方向に沿った回転軸回りに回転する上下一対のロール21u,21dを有している。そして、上ロール21uは、外周面にカッター刃21cを有したカッターロール21uであり、他方、下ロール21dは、平滑な外周面でカッター刃21cを受けるアンビルロール21dである。また、カッター刃21cは、脚回り開口部7HLの形状に対応した環状の所謂抜き刃であり、カッターロール21uの外周面から突出している。よって、これら上下ロール21u,21d同士の間のロール間隙を外装シート7aが通過する際に、外装シート7aにおいて環状のカッター刃21cの内周側に対応する部分が同シート7aから打ち抜かれて、これにより、外装シート7aに脚回り開口部7HLが形成される。
The formation process of the leg opening 7HL is performed by the die cutter device 21. The die cutter device 21 has a pair of upper and lower rolls 21u and 21d that rotate around a rotation axis along the CD direction with the outer peripheral surfaces facing each other. The upper roll 21u is a cutter roll 21u having a cutter blade 21c on the outer peripheral surface, and the lower roll 21d is an anvil roll 21d that receives the cutter blade 21c on a smooth outer peripheral surface. The cutter blade 21c is an annular so-called punching blade corresponding to the shape of the leg opening 7HL, and protrudes from the outer peripheral surface of the cutter roll 21u. Therefore, when the exterior sheet 7a passes through the roll gap between the upper and lower rolls 21u, 21d, a portion corresponding to the inner peripheral side of the annular cutter blade 21c in the exterior sheet 7a is punched from the sheet 7a. Thereby, the leg opening 7HL is formed in the exterior sheet 7a.
ちなみに、この例では、上下ロール21u,21dの駆動回転の駆動源は、サーボモータ(不図示)とされている。また、カッター刃21cは、上ロール21uの外周面に1つだけ設けられている。よって、外装シート7aが、MD方向に上記の第1ピッチP1の長さだけダイカッター装置21を通過する度に、上ロール21u及び下ロール21dはそれぞれ一回転し、これにより、外装シート7aには第1ピッチP1で脚回り開口部7HLが形成される。そして、これにより、第1の伸長状態でのおむつ1の一つ分の長さに相当するピッチで、外装シート7aには脚回り開口部7HLが形成されて、しかる後に、同シート7aを第1の伸長状態でMD方向の下流の外装シート収縮処理部30へ送り出す。
Incidentally, in this example, the drive source of the drive rotation of the upper and lower rolls 21u, 21d is a servo motor (not shown). Further, only one cutter blade 21c is provided on the outer peripheral surface of the upper roll 21u. Therefore, each time the exterior sheet 7a passes through the die cutter device 21 by the length of the first pitch P1 in the MD direction, the upper roll 21u and the lower roll 21d each make one rotation, whereby the exterior sheet 7a The leg opening 7HL is formed at the first pitch P1. As a result, a leg hole opening 7HL is formed in the exterior sheet 7a at a pitch corresponding to the length of one diaper 1 in the first extended state. In the extended state of 1, the sheet is sent to the exterior sheet shrinkage processing unit 30 downstream in the MD direction.
(3)外装シート収縮処理部30
次の外装シート収縮処理部30では、図4A及び図4Bに示すように、第1の伸長状態で搬送される外装シート7aをMD方向に収縮して、これにより、外装シート7aを、第1の伸長状態での伸長倍率よりも小さい伸長倍率の伸長状態(以下、第2の伸長状態と言う)にする。例えば、この例では、第1の伸長状態において2.5倍であった伸長倍率が10%だけ小さい2.25倍となるように、外装シート7aの伸び量を小さくする。そして、これにより、この後に外装シート7aに取り付けられる吸収性本体3に生じ得る皺の発生を抑制する。なお、以下では、第1の伸長状態での伸長倍率のことを「第1伸長倍率M1」と言い、第2の伸長状態での伸長倍率のことを「第2伸長倍率M2」と言う。 (3) Exterior sheetshrinkage processing unit 30
In the next exterior sheetshrinkage processing unit 30, as shown in FIGS. 4A and 4B, the exterior sheet 7a conveyed in the first extended state is contracted in the MD direction. The extension state of the extension ratio smaller than the extension ratio in the extension state (hereinafter referred to as the second extension state). For example, in this example, the amount of expansion of the exterior sheet 7a is reduced so that the expansion ratio, which was 2.5 times in the first extended state, is 2.25 times, which is 10% smaller. And this suppresses generation | occurrence | production of the wrinkles which may arise in the absorptive main body 3 attached to the exterior sheet | seat 7a after this. In the following, the extension magnification in the first extension state is referred to as “first extension magnification M1”, and the extension magnification in the second extension state is referred to as “second extension magnification M2”.
次の外装シート収縮処理部30では、図4A及び図4Bに示すように、第1の伸長状態で搬送される外装シート7aをMD方向に収縮して、これにより、外装シート7aを、第1の伸長状態での伸長倍率よりも小さい伸長倍率の伸長状態(以下、第2の伸長状態と言う)にする。例えば、この例では、第1の伸長状態において2.5倍であった伸長倍率が10%だけ小さい2.25倍となるように、外装シート7aの伸び量を小さくする。そして、これにより、この後に外装シート7aに取り付けられる吸収性本体3に生じ得る皺の発生を抑制する。なお、以下では、第1の伸長状態での伸長倍率のことを「第1伸長倍率M1」と言い、第2の伸長状態での伸長倍率のことを「第2伸長倍率M2」と言う。 (3) Exterior sheet
In the next exterior sheet
かかる外装シート7aの収縮処理は、MD方向に並んで設けられた二つのニップロール機構31,33によってなされる。すなわち、MD方向の所定位置には上流側ニップロール機構31が配されており、また、当該上流側ニップロール機構31よりも下流側の位置には下流側ニップロール機構33が配されている。そして、どちらのニップロール機構31,33も、概ね同構成である。
すなわち、上流側ニップロール機構31は、CD方向に沿った回転軸回りに回転する上下一対のニップロール31u,31dを有し、また、下流側ニップロール機構33も、CD方向に沿った回転軸回りに回転する上下一対のニップロール33u,33dを有している。そして、上流側ニップロール機構31の一対のニップロール31u,31dが、それぞれ互いの外周面で外装シート7aを挟み込みながら、当該ニップロール31u,31dが、駆動源としてのサーボモータ(不図示)から駆動力を付与されて駆動回転することにより、外装シート7aをMD方向の下流へ送り出す。また、同様に、下流側ニップロール機構33の一対のニップロール33u,33dが、それぞれ互いの外周面で外装シート7aを挟み込みながら、当該ニップロール33u,33dが、駆動源としてのサーボモータ(不図示)から駆動力を付与されて駆動回転することにより、外装シート7aをMD方向の更に下流へと送り出す。 The shrinking process of theexterior sheet 7a is performed by the two nip roll mechanisms 31 and 33 provided side by side in the MD direction. That is, an upstream nip roll mechanism 31 is disposed at a predetermined position in the MD direction, and a downstream nip roll mechanism 33 is disposed at a position downstream of the upstream nip roll mechanism 31. Both nip roll mechanisms 31 and 33 have substantially the same configuration.
That is, the upstream niproll mechanism 31 has a pair of upper and lower nip rolls 31u and 31d that rotate around the rotation axis along the CD direction, and the downstream nip roll mechanism 33 also rotates around the rotation axis along the CD direction. It has a pair of upper and lower nip rolls 33u and 33d. Then, while the pair of nip rolls 31u and 31d of the upstream nip roll mechanism 31 sandwich the exterior sheet 7a between the outer peripheral surfaces of each other, the nip rolls 31u and 31d receive driving force from a servo motor (not shown) as a driving source. The exterior sheet 7a is fed downstream in the MD direction by being applied and rotated. Similarly, while the pair of nip rolls 33u and 33d of the downstream nip roll mechanism 33 sandwich the outer sheet 7a between the outer peripheral surfaces of the downstream nip roll mechanism 33, the nip rolls 33u and 33d are driven by a servo motor (not shown) as a drive source. By applying driving force and driving rotation, the exterior sheet 7a is sent further downstream in the MD direction.
すなわち、上流側ニップロール機構31は、CD方向に沿った回転軸回りに回転する上下一対のニップロール31u,31dを有し、また、下流側ニップロール機構33も、CD方向に沿った回転軸回りに回転する上下一対のニップロール33u,33dを有している。そして、上流側ニップロール機構31の一対のニップロール31u,31dが、それぞれ互いの外周面で外装シート7aを挟み込みながら、当該ニップロール31u,31dが、駆動源としてのサーボモータ(不図示)から駆動力を付与されて駆動回転することにより、外装シート7aをMD方向の下流へ送り出す。また、同様に、下流側ニップロール機構33の一対のニップロール33u,33dが、それぞれ互いの外周面で外装シート7aを挟み込みながら、当該ニップロール33u,33dが、駆動源としてのサーボモータ(不図示)から駆動力を付与されて駆動回転することにより、外装シート7aをMD方向の更に下流へと送り出す。 The shrinking process of the
That is, the upstream nip
ここで、上流側ニップロール機構31のニップロール31u,31dの周速値V31(m/分)は、前述の超音波溶着装置17のアンビルローラー17aの周速値V17a(m/分)と概ね同値とされており、これにより、当該ニップロール31u,31dの周速値V31は、その直近上流側において第1の伸長状態で搬送される外装シート7aの搬送速度値(m/分)たる第1搬送速度値と概ね同値とされている。これに対して、下流側ニップロール機構33のニップロール33u,33dの周速値V33(m/分)は、上流側ニップロール機構31のニップロール31u,31dの周速値V31よりも10%だけ小さい値とされている。よって、外装シート7aが上流側ニップロール機構31と下流側ニップロール機構33との間の搬送経路R30を通過する間に、同シート7aの伸長状態は、第1の伸長状態での伸長倍率よりも10%だけ伸長倍率が小さい第2の伸長状態へと収縮される。そして、この第2の伸長状態の外装シート7aは、MD方向の下流側の吸収性本体取り付け処理部40へと送り出される。
Here, the peripheral speed value V31 (m / min) of the nip rolls 31u and 31d of the upstream nip roll mechanism 31 is substantially the same value as the peripheral speed value V17a (m / min) of the anvil roller 17a of the ultrasonic welding device 17 described above. Thus, the peripheral speed value V31 of the nip rolls 31u, 31d is the first transport speed that is the transport speed value (m / min) of the outer sheet 7a that is transported in the first extended state on the most upstream side thereof. It is almost the same value. On the other hand, the peripheral speed value V33 (m / min) of the nip rolls 33u and 33d of the downstream nip roll mechanism 33 is 10% smaller than the peripheral speed value V31 of the nip rolls 31u and 31d of the upstream nip roll mechanism 31. Has been. Therefore, while the exterior sheet 7a passes through the conveyance path R30 between the upstream nip roll mechanism 31 and the downstream nip roll mechanism 33, the stretched state of the sheet 7a is 10 more than the stretch magnification in the first stretched state. It is shrunk to the second extension state where the extension ratio is small by%. And this exterior sheet | seat 7a of the 2nd expansion | extension state is sent out to the absorptive main body attachment process part 40 of the downstream of MD direction.
ちなみに、外装シート7aが上流側ニップロール機構31のニップロール31u,31dの位置を通過する際には、上述のように、伸縮性シート8aのうちで上記位置を通過する部分を、順次MD方向に収縮させる。よって、低伸長性シート9aにおける第1部分9a1及び第2部分9a2が上記位置を通過する際には、同シート9aに順次皺が形成されていき、その結果、外装シート7aに整然とした皺を綺麗に形成することができる。
Incidentally, when the exterior sheet 7a passes through the positions of the nip rolls 31u and 31d of the upstream nip roll mechanism 31, as described above, the portion of the stretchable sheet 8a that passes through the position is sequentially contracted in the MD direction. Let Therefore, when the first portion 9a1 and the second portion 9a2 of the low-extension sheet 9a pass through the above position, the wrinkles are sequentially formed on the sheet 9a, and as a result, the orderly wrinkles are formed on the exterior sheet 7a. It can be formed neatly.
ところで、この例では、当該収縮処理以降の外装シート7aの搬送は、基本的に概ね第2の伸長状態でなされるが、かかる搬送は、外装シート7aの搬送速度値が、上記の第1搬送速度値よりも、上記の収縮に対応する割合だけ小さな搬送速度値(以下、第2搬送速度値と言う)に概ね維持されることで実現される。ちなみに、かかる第2搬送速度値を言い換えると、「第2伸長倍率を第1伸長倍率で除算してなる除算値を第1搬送速度値に乗算してなる値」と言うこともできる。
By the way, in this example, the conveyance of the exterior sheet 7a after the contraction process is basically performed in the second extended state. However, the conveyance speed value of the exterior sheet 7a is the above-described first conveyance. This is realized by maintaining the conveyance speed value smaller than the speed value by a rate corresponding to the above-described contraction (hereinafter referred to as the second conveyance speed value). Incidentally, in other words, the second transport speed value can be referred to as “a value obtained by multiplying the first transport speed value by a division value obtained by dividing the second expansion ratio by the first expansion ratio”.
また、ここで、外装シート7aの上記収縮の度合いを示す値として収縮率(%)を定義すると、次のようになる。すなわち、第1伸長倍率M1から第2伸長倍率M2を減算してなる減算値(=M1-M2)を第1伸長倍率M1で除算してなる除算値(=(M1-M2)/M1)の百分率表記値が、上記の収縮率(%)となる。この例では、既述のように、かかる収縮率は10%とされていたが、何等これに限らない。すなわち、外装シート7aが張った状態を維持しながら、収縮可能な範囲であれば、任意の値に設定しても良く、例えば、2%~80%の範囲の任意値としても良いし、より狭くは、5%~50%の範囲の任意値としても良いし、更に狭くは、7%~30%の任意値としても良い。
Further, here, when the shrinkage rate (%) is defined as a value indicating the degree of shrinkage of the exterior sheet 7a, it is as follows. That is, a subtraction value (= M1-M2) obtained by subtracting the second expansion magnification M2 from the first expansion magnification M1 is a division value (= (M1-M2) / M1) obtained by dividing the first expansion magnification M1. The percentage notation value is the shrinkage rate (%). In this example, the shrinkage rate is 10% as described above, but the present invention is not limited to this. That is, an arbitrary value may be set as long as it can be contracted while maintaining the stretched state of the exterior sheet 7a, for example, an arbitrary value in the range of 2% to 80% may be used. The narrow value may be an arbitrary value in the range of 5% to 50%, and the narrow value may be an arbitrary value of 7% to 30%.
(4)吸収性本体取り付け処理部40
次の吸収性本体取り付け処理部40では、図4A及び図4Bに示すように、第2の伸長状態で搬送される外装シート7aに対してMD方向に第2ピッチP2で吸収性本体3を取り付ける。ここで、かかる第2ピッチP2は、第2の伸長状態におけるMD方向のおむつ1の一つ分の長さに相当しているが、かかる第2の伸長状態は、既述のように、第1の伸長状態よりも収縮された状態である。そのため、当該第2ピッチP2は、前述の第1ピッチP1よりも、上記収縮率分だけ小さい値となっている。また、吸収性本体3は、外装シート7aにおいてMD方向に隣り合う脚回り開口部7HL,7HL同士の間の位置に取り付けられる。 (4) Absorbent bodyattachment processing unit 40
In the next absorptive main bodyattachment processing unit 40, as shown in FIGS. 4A and 4B, the absorptive main body 3 is attached at the second pitch P2 in the MD direction to the exterior sheet 7a conveyed in the second extended state. . Here, the second pitch P2 corresponds to the length of one diaper 1 in the MD direction in the second extended state, but the second extended state is, as described above, the first This is a contracted state rather than the stretched state of 1. Therefore, the second pitch P2 is a value smaller than the first pitch P1 by the contraction rate. Moreover, the absorptive main body 3 is attached to the position between the leg periphery openings 7HL and 7HL adjacent to each other in the MD direction in the exterior sheet 7a.
次の吸収性本体取り付け処理部40では、図4A及び図4Bに示すように、第2の伸長状態で搬送される外装シート7aに対してMD方向に第2ピッチP2で吸収性本体3を取り付ける。ここで、かかる第2ピッチP2は、第2の伸長状態におけるMD方向のおむつ1の一つ分の長さに相当しているが、かかる第2の伸長状態は、既述のように、第1の伸長状態よりも収縮された状態である。そのため、当該第2ピッチP2は、前述の第1ピッチP1よりも、上記収縮率分だけ小さい値となっている。また、吸収性本体3は、外装シート7aにおいてMD方向に隣り合う脚回り開口部7HL,7HL同士の間の位置に取り付けられる。 (4) Absorbent body
In the next absorptive main body
かかる吸収性本体3の取り付け処理は、例えば回転ドラム装置41によって行われる。回転ドラム装置41は、CD方向に沿った回転軸回りに回転する回転ドラム42と、回転ドラム42を駆動回転する駆動源としてのサーボモータ(不図示)と、回転ドラム42の外周面に回転方向に並んで設けられた複数の保持パッド43,43…と、を有する。各保持パッド43は、吸収性本体3を吸着保持可能な保持面を有し、各保持面は、回転ドラム42の回転半径方向の外方を向いている。そして、保持面の面心に位置する自転軸回りに自転することにより、各保持パッド43は、保持面で保持中の吸収性本体3の長手方向の向きをMD方向からCD方向に変更可能である。
The mounting process of the absorbent main body 3 is performed by, for example, the rotating drum device 41. The rotary drum device 41 includes a rotary drum 42 that rotates about a rotation axis along the CD direction, a servo motor (not shown) that drives and rotates the rotary drum 42, and a rotational direction on the outer peripheral surface of the rotary drum 42. And a plurality of holding pads 43 arranged side by side. Each holding pad 43 has a holding surface capable of sucking and holding the absorbent main body 3, and each holding surface faces outward in the rotational radius direction of the rotating drum 42. Then, by rotating around the rotation axis located at the center of the holding surface, each holding pad 43 can change the longitudinal direction of the absorbent main body 3 being held by the holding surface from the MD direction to the CD direction. is there.
また、各保持パッド43は、回転ドラム42に対して相対的に回転方向の所定範囲に亘って往復移動可能に構成されており、そして、かかる往復移動動作は、不図示の適宜なカム機構によって回転ドラム42の回転動作から作り出される。よって、回転ドラム42の回転方向の位置に応じて、回転方向に隣り合う保持パッド43,43同士のピッチを変更可能である。すなわち、回転方向の第1位置S1では、隣り合う保持パッド43,43同士の間の間隔が詰まった状態にすることができるとともに、回転方向の第2位置S2では、保持パッド43,43同士の間の間隔が大きく開いた状態にすることができる。
Each holding pad 43 is configured to be reciprocally movable over a predetermined range in the rotational direction relative to the rotary drum 42, and the reciprocating operation is performed by an appropriate cam mechanism (not shown). Created from the rotational motion of the rotating drum 42. Accordingly, the pitch between the holding pads 43 adjacent to each other in the rotation direction can be changed according to the position of the rotation drum 42 in the rotation direction. That is, at the first position S1 in the rotation direction, the gap between the adjacent holding pads 43 and 43 can be made narrow, and at the second position S2 in the rotation direction, the holding pads 43 and 43 The interval between them can be greatly opened.
ここで、かかる第1位置S1には、複数の吸収性本体3がMD方向に連続してなる連続体3aの形態で供給される。そして、各保持パッド43が当該第1位置S1を通過する際には、同パッド43が吸収性本体の連続体3aを吸着して受け取るとともに、その近傍に位置するカッター装置45で吸収性本体の連続体3aを分断して保持パッド43上に単票状の吸収性本体3を生成する。そして、そのまま、保持パッド43は回転ドラム42の回転動作によって回転方向の上記第2位置S2へと移動するが、その移動中に、保持パッド43は上記の自転動作を行って吸収性本体3の長手方向の向きをMD方向からCD方向に変更する。また、これと併せて、同移動中には、保持パッド43が上記の往復移動動作を行って、隣り合う保持パッド43,43同士のピッチを第2ピッチP2に変更する。更に、同第2位置S2には、外装シート7aの搬送経路が近接配置されている。よって、回転ドラム装置41は、第2の伸長状態の外装シート7aに対してMD方向に第2ピッチP2で吸収性本体3を取り付けることができる。
Here, the first position S1 is supplied in the form of a continuous body 3a in which a plurality of absorbent main bodies 3 are continuously formed in the MD direction. And when each holding pad 43 passes the said 1st position S1, while the pad 43 adsorb | sucks and receives the continuous body 3a of an absorptive main body, the cutter apparatus 45 located in the vicinity WHEREIN: The continuous body 3 a is divided to generate a single-cut absorbent main body 3 on the holding pad 43. As it is, the holding pad 43 is moved to the second position S2 in the rotation direction by the rotating operation of the rotating drum 42. During the movement, the holding pad 43 performs the above-described rotation operation to perform the rotation of the absorbent main body 3. The direction of the longitudinal direction is changed from the MD direction to the CD direction. At the same time, during the movement, the holding pad 43 performs the above-described reciprocating movement to change the pitch between the adjacent holding pads 43 and 43 to the second pitch P2. Furthermore, the conveyance path of the exterior sheet 7a is disposed close to the second position S2. Therefore, the rotary drum device 41 can attach the absorbent main body 3 at the second pitch P2 in the MD direction with respect to the second extended exterior sheet 7a.
(5)二つ折り処理部50
次の二つ折り処理部50では、吸収性本体3が取り付けられた外装シート7aが、おむつ1の股下部7cに相当するCD方向の略中央部を折り位置としてCD方向に二つ折りされる。そして、これにより、外装シート7aは、同シート7aにおけるCD方向の一端部と他端部とが厚さ方向に重ね合わせられた状態にされる。ちなみに、一端部は、最終的におむつ1の腹側部7fとなり、他端部はおむつ1の背側部7bとなる。 (5)Folding processing unit 50
In the nexttwo-fold processing section 50, the exterior sheet 7a to which the absorbent main body 3 is attached is folded in two in the CD direction with the substantially central portion in the CD direction corresponding to the crotch part 7c of the diaper 1 as the folding position. Thus, the exterior sheet 7a is brought into a state where one end and the other end in the CD direction of the sheet 7a are overlapped in the thickness direction. Incidentally, one end portion finally becomes the ventral side portion 7f of the diaper 1, and the other end portion becomes the back side portion 7b of the diaper 1.
次の二つ折り処理部50では、吸収性本体3が取り付けられた外装シート7aが、おむつ1の股下部7cに相当するCD方向の略中央部を折り位置としてCD方向に二つ折りされる。そして、これにより、外装シート7aは、同シート7aにおけるCD方向の一端部と他端部とが厚さ方向に重ね合わせられた状態にされる。ちなみに、一端部は、最終的におむつ1の腹側部7fとなり、他端部はおむつ1の背側部7bとなる。 (5)
In the next
かかる外装シート7aの二つ折り処理は、MD方向の所定位置に配された二つ折りガイド部材(不図示)によってなされる。二つ折りガイド部材は、周知構成であり、例えば適宜な複数の棒材を組み合わせて構成されている。そして、この二つ折りガイド部材の配置位置を外装シート7aが通過する際に、同ガイド部材によって外装シート7aはCD方向の略中央部を折り位置として徐々に折り曲げられていき、二つ折りガイド部材を通過し終えたときには、外装シート7aは二つ折り状態となっている。
The folding process of the exterior sheet 7a is performed by a bi-fold guide member (not shown) disposed at a predetermined position in the MD direction. The bi-fold guide member has a well-known configuration, for example, a combination of a plurality of appropriate bar members. Then, when the exterior sheet 7a passes through the position where the bifold guide member is disposed, the exterior sheet 7a is gradually folded by the guide member with the substantially central portion in the CD direction being the folding position. When it has passed, the exterior sheet 7a is folded in two.
ちなみに、この二つ折り処理部50での外装シート7aの伸長状態は、前述の第2の伸長状態に維持されており、そして、この伸長状態のまま同外装シート7aはMD方向の下流へと送出される。すなわち、二つ折り処理部50での外装シート7aの搬送速度値は、前述の第2搬送速度値と概ね同値に維持されている。
Incidentally, the stretched state of the exterior sheet 7a in the bi-fold processing unit 50 is maintained in the above-described second stretched state, and the exterior sheet 7a is sent downstream in the MD direction in this stretched state. Is done. That is, the conveyance speed value of the exterior sheet 7a in the bi-fold processing unit 50 is maintained substantially the same as the above-described second conveyance speed value.
(6)エンドシール処理部60
次のエンドシール処理部60でも、外装シート7aは、第2の伸長状態に維持されている。そして、このエンドシール処理部60では、二つ折りされた外装シート7aを当該二つ折り状態に固定する。すなわち、二つ折りによって厚さ方向に重ね合わせられた外装シート7aにおけるCD方向の一端部と他端部とを、MD方向に隣り合う吸収性本体3,3同士の間の位置で溶着して、二つ折り状態に固定する。なお、溶着された部分は、外装シート7a上にエンドシール部jesとして残存する。そして、かかるエンドシール部jesの形成対象位置は、外装シート7aが第2の伸長状態にあることから、MD方向に第2ピッチP2で現れる。そのため、同処理部60は、外装シート7aにエンドシール部jesを第2ピッチP2で形成する。 (6) Endseal processing unit 60
Even in the next endseal processing unit 60, the exterior sheet 7a is maintained in the second extended state. The end seal processing unit 60 fixes the folded outer sheet 7a in the folded state. That is, one end and the other end in the CD direction of the exterior sheet 7a overlapped in the thickness direction by folding in two are welded at positions between the absorbent bodies 3 and 3 adjacent in the MD direction, Fix in a folded state. The welded portion remains as an end seal portion jes on the exterior sheet 7a. And the formation target position of this end seal part jes appears in the MD direction at the 2nd pitch P2 since the exterior sheet 7a exists in a 2nd expansion | extension state. Therefore, the processing unit 60 forms the end seal portions je at the second pitch P2 on the exterior sheet 7a.
次のエンドシール処理部60でも、外装シート7aは、第2の伸長状態に維持されている。そして、このエンドシール処理部60では、二つ折りされた外装シート7aを当該二つ折り状態に固定する。すなわち、二つ折りによって厚さ方向に重ね合わせられた外装シート7aにおけるCD方向の一端部と他端部とを、MD方向に隣り合う吸収性本体3,3同士の間の位置で溶着して、二つ折り状態に固定する。なお、溶着された部分は、外装シート7a上にエンドシール部jesとして残存する。そして、かかるエンドシール部jesの形成対象位置は、外装シート7aが第2の伸長状態にあることから、MD方向に第2ピッチP2で現れる。そのため、同処理部60は、外装シート7aにエンドシール部jesを第2ピッチP2で形成する。 (6) End
Even in the next end
かかるエンドシール部jesの形成処理は、ヒートシール加工装置61によって行われる。ヒートシール加工装置61は、外周面を互いに対向させつつ、CD方向に沿った回転軸回りに駆動回転する上下一対のロール61u,61dを有する。
上ロール61uは、外周面に加熱された凸状のシールパターン部61spを有し、下ロール61dは、当該シールパターン部61spを受けるべく平滑な外周面を有する。また、シールパターン部61spは、エンドシール部jesに対応した形状で上ロール61uの外周面から突出している。よって、これら上下ロール61u,61d同士の間のロール間隙を二つ折り状態の外装シート7aが通過する際に、外装シート7aのうちでMD方向に隣り合う吸収性本体3,3同士の間の部分が、シールパターン部61spと下ロール61dの外周面とによって挟圧されながら加熱されて、これにより、外装シート7aにおいておむつ1の幅方向の端部となる部分が溶融して当該部分にエンドシール部jesが形成される。 The end seal portion je is formed by the heatseal processing device 61. The heat seal processing device 61 includes a pair of upper and lower rolls 61u and 61d that are driven and rotated around a rotation axis along the CD direction with their outer peripheral surfaces facing each other.
Theupper roll 61u has a convex seal pattern portion 61sp heated on the outer peripheral surface, and the lower roll 61d has a smooth outer peripheral surface to receive the seal pattern portion 61sp. In addition, the seal pattern portion 61sp protrudes from the outer peripheral surface of the upper roll 61u in a shape corresponding to the end seal portion jes. Therefore, when the exterior sheet 7a in a folded state passes through the roll gap between the upper and lower rolls 61u, 61d, a portion between the absorbent main bodies 3, 3 adjacent to each other in the MD direction in the exterior sheet 7a. Is heated while being pinched by the seal pattern portion 61sp and the outer peripheral surface of the lower roll 61d, whereby the outer sheet 7a melts the portion that becomes the end of the diaper 1 in the width direction, and the end seal is applied to the portion. Part jes is formed.
上ロール61uは、外周面に加熱された凸状のシールパターン部61spを有し、下ロール61dは、当該シールパターン部61spを受けるべく平滑な外周面を有する。また、シールパターン部61spは、エンドシール部jesに対応した形状で上ロール61uの外周面から突出している。よって、これら上下ロール61u,61d同士の間のロール間隙を二つ折り状態の外装シート7aが通過する際に、外装シート7aのうちでMD方向に隣り合う吸収性本体3,3同士の間の部分が、シールパターン部61spと下ロール61dの外周面とによって挟圧されながら加熱されて、これにより、外装シート7aにおいておむつ1の幅方向の端部となる部分が溶融して当該部分にエンドシール部jesが形成される。 The end seal portion je is formed by the heat
The
ちなみに、この例では、上下ロール61u,61dの駆動回転の駆動源は、サーボモータ(不図示)とされている。また、上ロール61uの外周面には、上記のシールパターン部61spが1つだけ設けられている。よって、ヒートシール加工装置61を外装シート7aが第2ピッチP2の長さだけ通過する度に上ロール61uは1回転し、これにより、第2ピッチP2でエンドシール部jesが形成される。そして、その結果、第2の伸長状態でのおむつ1の一つ分の長さに相当するピッチで、外装シート7aにはエンドシール部jesが形成される。
Incidentally, in this example, the drive source of the drive rotation of the upper and lower rolls 61u, 61d is a servo motor (not shown). Further, only one seal pattern portion 61sp is provided on the outer peripheral surface of the upper roll 61u. Therefore, every time the exterior sheet 7a passes through the heat seal processing device 61 by the length of the second pitch P2, the upper roll 61u rotates once, thereby forming the end seal portion je at the second pitch P2. As a result, end seal portions je are formed on the exterior sheet 7a at a pitch corresponding to the length of one diaper 1 in the second extended state.
(7)分断処理部70
次の分断処理部70でも、外装シート7aは、第2の伸長状態に維持されている。よって、二つ折り状態に固定された外装シート7aを第2ピッチP2で分断し、これにより、外装シート7aから下流端部が当該第2ピッチP2で切り離されておむつ1が生成される。 (7)Dividing processing unit 70
Even in the nextdivision processing unit 70, the exterior sheet 7a is maintained in the second extended state. Therefore, the exterior sheet 7a fixed in the folded state is divided at the second pitch P2, and thereby the downstream end is separated from the exterior sheet 7a at the second pitch P2, and the diaper 1 is generated.
次の分断処理部70でも、外装シート7aは、第2の伸長状態に維持されている。よって、二つ折り状態に固定された外装シート7aを第2ピッチP2で分断し、これにより、外装シート7aから下流端部が当該第2ピッチP2で切り離されておむつ1が生成される。 (7)
Even in the next
かかる外装シート7aの分断処理は、ロータリーカッター装置71により行われる。ロータリーカッター装置71は、外周面を互いに対向させつつCD方向に沿った回転軸回りに駆動回転する上下一対のロール71u,71dを有している。そして、上ロール71uが、外周面にカッター刃71cを有したカッターロール71uであり、下ロール71dは、平滑な外周面でカッター刃71cを受けるアンビルロール71dである。また、カッター刃71cは、例えばCD方向に沿って延びた平刃であり、カッターロール71uの外周面から突出している。よって、これら上下ロール71u,71d同士の間のロール間隙を二つ折り状態に固定された外装シート7aが通過する際に、当該外装シート7aがエンドシール部jesの位置で分断されて、これにより、外装シート7aの下流端部が切り離され、そして、当該切り離された下流端部がおむつ1となる。
The dividing process of the exterior sheet 7 a is performed by the rotary cutter device 71. The rotary cutter device 71 has a pair of upper and lower rolls 71u and 71d that are driven and rotated around a rotation axis along the CD direction with their outer peripheral surfaces facing each other. The upper roll 71u is a cutter roll 71u having a cutter blade 71c on the outer peripheral surface, and the lower roll 71d is an anvil roll 71d that receives the cutter blade 71c on a smooth outer peripheral surface. The cutter blade 71c is, for example, a flat blade extending along the CD direction, and protrudes from the outer peripheral surface of the cutter roll 71u. Therefore, when the exterior sheet 7a fixed in a folded state through the roll gap between the upper and lower rolls 71u, 71d passes, the exterior sheet 7a is divided at the position of the end seal portion jes. The downstream end portion of the exterior sheet 7 a is cut off, and the cut down downstream end portion becomes the diaper 1.
ちなみに、この例では、上下ロール71u,71dの駆動回転の駆動源は、サーボモータ(不図示)とされている。また、カッター刃71cは、上ロール71uの外周面に1つだけ設けられている。更に、外装シート7aは、第2の伸長状態で搬送されている。よって、ロータリーカッター装置71を外装シート7aが上記第2ピッチP2の長さだけ通過する度に、上ロール71u及び下ロール71dがそれぞれ一回転し、これにより、外装シート7aからおむつ1が一つだけ分断されて生成される。そして、生成された各おむつ1は、ベルトコンベア等の適宜な搬送機構CVによってMD方向の下流へ送られる。
Incidentally, in this example, the drive source of the drive rotation of the upper and lower rolls 71u, 71d is a servo motor (not shown). Further, only one cutter blade 71c is provided on the outer peripheral surface of the upper roll 71u. Furthermore, the exterior sheet 7a is conveyed in the second extended state. Therefore, each time the exterior sheet 7a passes through the rotary cutter device 71 by the length of the second pitch P2, the upper roll 71u and the lower roll 71d each rotate one time, whereby one diaper 1 is formed from the exterior sheet 7a. It is generated only by being divided. Then, each generated diaper 1 is sent downstream in the MD direction by an appropriate transport mechanism CV such as a belt conveyor.
===その他の実施の形態===
以上、本発明の実施形態について説明したが、上記の実施形態は、本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。また、本発明は、その趣旨を逸脱することなく、変更や改良され得るとともに、本発明にはその等価物が含まれるのはいうまでもない。例えば、以下に示すような変形が可能である。 === Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.
以上、本発明の実施形態について説明したが、上記の実施形態は、本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。また、本発明は、その趣旨を逸脱することなく、変更や改良され得るとともに、本発明にはその等価物が含まれるのはいうまでもない。例えば、以下に示すような変形が可能である。 === Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.
上述の実施形態では、図5に示すように、おむつ1の製造ラインLMの外装シート生成処理部10が、波形ロール機構13を有していた。そして、これにより、当該波形ロール機構13が低伸長性シート9aに第1部分9a1と第2部分9a2とを形成した後に、同シート9aを巻き取らずに、そのまま、同処理部10の接合装置15へと搬送していたが、何等これに限らない。
すなわち、上記の波形ロール機構13を、おむつ1の製造ラインLMが具備する代わりに、同機構13を、不図示の別の製造ラインに具備させても良い。なお、その場合には、当該別の製造ラインの波形ロール機構13によって、低伸長性シート9aに第1部分9a1と第2部分9a2とを形成するが、当該形成後には、一旦同シート9aをロール状に巻き取ってシートロールの形態にしてから、適宜な保管場所で保管する。そして、使用時期が来たら同シートロールを保管場所からおむつ1の製造ラインLMへと移動するとともに、同製造ラインLMの外装シート生成処理部10が具備する適宜な繰り出し装置(不図示)に取り付けて、同シートロールから低伸長性シート9aを繰り出し(「準備すること」に相当)、これにより、第1部分9a1及び第2部分9a2が形成済みの低伸長性シート9aを同処理部10の接合装置15へと供給することになる。
但し、このようにすると、第1部分9a1及び第2部分9a2が形成された低伸長性シート9aを巻き取る際に、巻き取り張力などによって、低伸長性シート9aの嵩が潰れる恐れがある。そのため、波形ロール機構13により低伸長性シート9aに付与された上記の嵩を潰さないようにする観点からは、上述の本実施形態のように波形ロール機構13を外装シート生成処理部10に設ける方が良い。 In the above-described embodiment, as illustrated in FIG. 5, the exterior sheetgeneration processing unit 10 of the production line LM of the diaper 1 has the corrugated roll mechanism 13. As a result, after the corrugated roll mechanism 13 forms the first portion 9a1 and the second portion 9a2 on the low-extension sheet 9a, the sheet 9a is not taken up, and the joining device of the processing unit 10 is used as it is. However, the present invention is not limited to this.
That is, instead of thecorrugated roll mechanism 13 provided in the diaper 1 production line LM, the mechanism 13 may be provided in another production line (not shown). In this case, the first portion 9a1 and the second portion 9a2 are formed on the low-extensible sheet 9a by the corrugated roll mechanism 13 of the other production line. It is wound up in a roll shape to form a sheet roll, and then stored in an appropriate storage location. When the time of use comes, the sheet roll is moved from the storage location to the production line LM of the diaper 1 and attached to an appropriate feeding device (not shown) provided in the exterior sheet generation processing unit 10 of the production line LM. Then, the low elongation sheet 9a is fed out from the sheet roll (corresponding to “preparing”), whereby the low elongation sheet 9a in which the first portion 9a1 and the second portion 9a2 are formed is removed from the processing unit 10 This is supplied to the joining device 15.
However, if it does in this way, when winding the low-extension sheet |seat 9a in which the 1st part 9a1 and the 2nd part 9a2 were formed, there exists a possibility that the volume of the low-extension sheet | seat 9a may be crushed by winding tension | tensile_strength. Therefore, from the viewpoint of preventing the above-described bulk imparted to the low-extensible sheet 9a by the corrugated roll mechanism 13 from being provided, the corrugated roll mechanism 13 is provided in the exterior sheet generation processing unit 10 as in the above-described embodiment. Better.
すなわち、上記の波形ロール機構13を、おむつ1の製造ラインLMが具備する代わりに、同機構13を、不図示の別の製造ラインに具備させても良い。なお、その場合には、当該別の製造ラインの波形ロール機構13によって、低伸長性シート9aに第1部分9a1と第2部分9a2とを形成するが、当該形成後には、一旦同シート9aをロール状に巻き取ってシートロールの形態にしてから、適宜な保管場所で保管する。そして、使用時期が来たら同シートロールを保管場所からおむつ1の製造ラインLMへと移動するとともに、同製造ラインLMの外装シート生成処理部10が具備する適宜な繰り出し装置(不図示)に取り付けて、同シートロールから低伸長性シート9aを繰り出し(「準備すること」に相当)、これにより、第1部分9a1及び第2部分9a2が形成済みの低伸長性シート9aを同処理部10の接合装置15へと供給することになる。
但し、このようにすると、第1部分9a1及び第2部分9a2が形成された低伸長性シート9aを巻き取る際に、巻き取り張力などによって、低伸長性シート9aの嵩が潰れる恐れがある。そのため、波形ロール機構13により低伸長性シート9aに付与された上記の嵩を潰さないようにする観点からは、上述の本実施形態のように波形ロール機構13を外装シート生成処理部10に設ける方が良い。 In the above-described embodiment, as illustrated in FIG. 5, the exterior sheet
That is, instead of the
However, if it does in this way, when winding the low-extension sheet |
上述の実施形態では、図5に示すように、超音波溶着装置17のホーン17h自体は非回転に構成され、そして、その振動面17hsは平面をなしていたが、何等これに限らない。例えば、ホーン17hについても、アンビルローラー17aと同様にローラー構成にしても良い。詳しくは、当該ホーン17hを、CD方向に沿った回転軸回りに回転可能なローラー(以下、ホーンローラーと言うが、不図示)として構成し、その外周面を振動面として機能させても良い。なお、この場合には、ホーンローラーの外周面たる振動面は、アンビルローラー17aの外周面に対して、接近及び離間する方向に振動することになる。また、ホーンローラー又はアンビルローラー17aの少なくとも一方のローラーの外周面に、前述の複数の突部17at,17at…が、上述の接合パターンに対応した配置パターンで設けられることになる。
In the above-described embodiment, as shown in FIG. 5, the horn 17h itself of the ultrasonic welding device 17 is configured to be non-rotating, and the vibration surface 17hs is a flat surface, but this is not a limitation. For example, the horn 17h may also have a roller configuration similar to the anvil roller 17a. Specifically, the horn 17h may be configured as a roller (hereinafter referred to as a horn roller, not shown) that can rotate around a rotation axis along the CD direction, and its outer peripheral surface may function as a vibration surface. In this case, the vibration surface as the outer peripheral surface of the horn roller vibrates in a direction approaching and separating from the outer peripheral surface of the anvil roller 17a. Moreover, the above-mentioned several protrusion 17at, 17at ... is provided in the outer peripheral surface of at least one roller of the horn roller or the anvil roller 17a by the arrangement pattern corresponding to the above-mentioned joining pattern.
上述の実施形態では、図5に示すように、外装シート生成処理部10でなされる伸縮性シート8aと低伸長性シート9aとの接合を、超音波溶着装置17で行っていたが、何等これに限らない。例えば、図9に示すように、超音波溶着装置17の代わりに、ヒートシール加工装置又は圧着加工装置を用いても良い。なお、ヒートシール加工装置の構成と圧着加工装置の構成とは、互いに類似している。すなわち、両者の構成上の相違点は、主にロールの加熱の有無の点のみにあって、どちらの装置も、CD方向に沿った回転軸回りに駆動回転する上下一対のロール19u,19dを有し、そして、これらロール19u,19dは、それぞれ、前述の超音波溶着装置17の場合のアンビルローラー17aの周速値V17aと同値の周速値で回転するように構成されている。また、上下一対のロール19u,19dのうちの少なくとも一方のロール19u(19d)の外周面には、前述の接合パターンに対応した配置パターンで複数の突部(不図示)が配置されている。
よって、かかる構成によれば、ロール19u,19d同士の間のロール間隙を、第1の伸長状態まで伸長された伸縮性シート8aと、第1部分9a1及び第2部分9a2が形成された低伸長性シート9aとが互いに重ね合わせられた状態で通過するが、当該通過時には、これらロール19u,19dによって両シート8a,9aは各突部で挟圧されて、これにより、両シート8a,9aには、上記の接合パターンに基づく接合部j,j…として溶着部又は圧着部が形成される。 In the above-described embodiment, as shown in FIG. 5, the joining of thestretchable sheet 8 a and the low stretchable sheet 9 a performed by the exterior sheet generation processing unit 10 is performed by the ultrasonic welding device 17. Not limited to. For example, as shown in FIG. 9, a heat seal processing device or a pressure processing device may be used instead of the ultrasonic welding device 17. Note that the configuration of the heat seal processing apparatus and the configuration of the crimping processing apparatus are similar to each other. That is, the difference in configuration between the two is mainly in the presence or absence of heating of the roll, and both apparatuses have a pair of upper and lower rolls 19u and 19d that are driven and rotated around the rotation axis along the CD direction. The rolls 19u and 19d are each configured to rotate at a peripheral speed value equal to the peripheral speed value V17a of the anvil roller 17a in the case of the ultrasonic welding device 17 described above. Further, a plurality of protrusions (not shown) are arranged on the outer peripheral surface of at least one of the upper and lower rolls 19u and 19d in an arrangement pattern corresponding to the above-described bonding pattern.
Therefore, according to such a configuration, the roll gap between the rolls 19u and 19d is low stretched in which the stretchable sheet 8a stretched to the first stretched state and the first portion 9a1 and the second portion 9a2 are formed. The sheet 9a passes in a state where the sheet 9a is superposed on each other, but at the time of the passage, the two sheets 8a, 9a are clamped by the respective protrusions by the rolls 19u, 19d. Are formed with welded portions or crimped portions as the joints j, j... Based on the above-described joint pattern.
よって、かかる構成によれば、ロール19u,19d同士の間のロール間隙を、第1の伸長状態まで伸長された伸縮性シート8aと、第1部分9a1及び第2部分9a2が形成された低伸長性シート9aとが互いに重ね合わせられた状態で通過するが、当該通過時には、これらロール19u,19dによって両シート8a,9aは各突部で挟圧されて、これにより、両シート8a,9aには、上記の接合パターンに基づく接合部j,j…として溶着部又は圧着部が形成される。 In the above-described embodiment, as shown in FIG. 5, the joining of the
Therefore, according to such a configuration, the roll gap between the
上述の実施形態では、伸縮性シート8aと低伸長性シート9aとを接合する接合パターンとして千鳥パターンを例示したが、何等これに限らない。例えば、格子目の各交点にそれぞれ接合部j,j…が形成される格子状パターンでも良いし、これ以外のパターンでも良い。
In the above-described embodiment, the staggered pattern is exemplified as the joining pattern for joining the stretchable sheet 8a and the low-extensible sheet 9a, but the invention is not limited to this. For example, it may be a lattice pattern in which joints j, j... Are formed at each intersection of lattices, or a pattern other than this may be used.
上述の実施形態では、伸縮性シート8aの伸縮方向をMD方向に沿わせていたために、低伸長性シート9aに第1部分9a1と第2部分9a2とをMD方向に交互に形成していた。そして、MD方向に隣り合う接合部j,j同士の間の非接合部jnに第1部分9a1の中央位置C9a1と第2部分9a2の中央位置C9a2とが少なくとも一つずつ含まれるように接合部jを形成し、これにより、MD方向の収縮した際に、非接合部jnに皺が確実に形成されるようにしていたが、何等これに限らない。例えば、次のようにしても良い。
In the above-described embodiment, since the stretchable direction of the stretchable sheet 8a is aligned with the MD direction, the first portions 9a1 and the second portions 9a2 are alternately formed in the MD direction on the low stretchable sheet 9a. The joint portion is so arranged that at least one central position C9a1 of the first portion 9a1 and at least one central position C9a2 of the second portion 9a2 are included in the non-joint portion jn between the joint portions j, j adjacent in the MD direction. Although j is formed and thereby, when the shrinkage in the MD direction occurs, the wrinkles are surely formed in the non-joined portion jn, but this is not restrictive. For example, the following may be performed.
先ず、図10の斜視イメージ図に示すように、伸縮性シート8a’の伸縮方向をCD方向に沿わせつつ同シート8a’をMD方向に搬送するが、当該搬送中に同シート9a’をCD方向に所定の伸長倍率まで伸長する。また、低伸長性シート9a’についてもMD方向に搬送しながら、同シート9a’上に、CD方向に延伸された第1部分9a1’と、第1部分9a1’よりも延伸されていない第2部分9a2’とがCD方向に交互に並ぶように当該部分9a1’,9a2’を形成する。そして、当該第1部分9a1’及び第2部分9a2’が形成された低伸長性シート9aを、上記CD方向に伸長状態の伸縮性シート8a’に接合する。但し、この接合の際には、CD方向に隣り合う接合部j’,j’同士の間の非接合部jn’に第1部分9a1’の中央位置C9a1’と第2部分9a2’の中央位置C9a2’とが少なくとも一つずつ含まれるように接合部j’を形成する。そして、このようにすれば、CD方向の伸長状態を解除してCD方向に収縮した際に、非接合部jn’には、MD方向に沿った皺が確実に形成されるようになる。
ちなみに、この例では、接合部j’,j’…を格子状パターンで形成しているが、何等これに限らず、前述の千鳥パターンで形成しても良い。 First, as shown in the perspective image diagram of FIG. 10, thesheet 8a ′ is conveyed in the MD direction while keeping the expansion / contraction direction of the elastic sheet 8a ′ in the CD direction. During the conveyance, the sheet 9a ′ is conveyed in the CD direction. To a predetermined expansion ratio. Further, the low-extensible sheet 9a ′ is also conveyed in the MD direction, and on the sheet 9a ′, the first part 9a1 ′ extended in the CD direction and the second part not extended more than the first part 9a1 ′. The portions 9a1 ′ and 9a2 ′ are formed so that the portions 9a2 ′ are alternately arranged in the CD direction. And the low extensible sheet | seat 9a in which the said 1st part 9a1 'and 2nd part 9a2' were formed is joined to the elastic sheet | seat 8a 'extended in the said CD direction. However, during this joining, the center position C9a1 ′ of the first part 9a1 ′ and the center position of the second part 9a2 ′ are in the non-joining part jn ′ between the joining parts j ′ and j ′ adjacent in the CD direction. The junction j ′ is formed so as to include at least one C9a2 ′. In this way, when the extended state in the CD direction is released and contracted in the CD direction, wrinkles along the MD direction are surely formed in the non-joint portion jn ′.
Incidentally, in this example, the junctions j ′, j ′,... Are formed in a lattice pattern, but the present invention is not limited to this, and may be formed in the above-described staggered pattern.
ちなみに、この例では、接合部j’,j’…を格子状パターンで形成しているが、何等これに限らず、前述の千鳥パターンで形成しても良い。 First, as shown in the perspective image diagram of FIG. 10, the
Incidentally, in this example, the junctions j ′, j ′,... Are formed in a lattice pattern, but the present invention is not limited to this, and may be formed in the above-described staggered pattern.
また、低伸長性シート9a’に対してCD方向に第1部分9a1’及び第2部分9a2’を交互に形成する装置としては、図11A及び図11Bに示すようなロール機構13’を例示できる。なお、図11Aは、ロール機構13’をMD方向の下流側から見た概略正面図であり、図11Bは、図11A中のB-B矢視図である。
当該ロール機構13’は、CD方向に沿った回転軸回りに回転する上下一対のロール13u’,13d’を有する。上ロール13u’は、大径部分13m’と小径部分13v’とをCD方向に交互に有し、同様に、下ロール13d’も、大径部分13m’と小径部分13v’とをCD方向に交互に有する。そして、これらロール13u’,13d’は、互いに、相手の小径部分13v’の近傍空間に自身の大径部分13m’を挿入しながら上下に配置され、これにより、ロール13u’,13d’の回転方向の一部Abにおいて互いの大径部分13m’,13m’を噛み合わせている。また、当該ロール13u’,13d’同士の間に低伸長性シート9aがMD方向に沿って通される。
よって、当該通過中の低伸長性シート9aは、一方のロール13u’(13d’)において互いに隣り合う大径部分13m’,13m’同士と、当該大径部分13m’,13m’同士の間の小径部分13v’に入り込む他方のロール13d’(13u’)の大径部分13m’とによって、三点曲げ状に変形される。そして、このときには、低伸長性シート9a’において一方のロール13u’(13d’)の大径部分13m’の頂面と当接する部分9a2’は、当該頂面に概ね相対移動不能に当接して、これにより、概ね延伸されずに上述の第2部分9a2’となり、また、同じく、同シート9a’において他方のロール13d’(13u’)の大径部分13m’の頂面と当接する部分9a2’も、当該頂面に概ね相対移動不能に当接して、これにより、概ね延伸されずに前述の第2部分9a2’となる。しかし、これら二つの第2部分9a2’,9a2’同士の間の部分9a1’は、上述の大径部分13m’の入り込みに基づいて延伸されて、これにより、当該部分9a1’は、前述の第1部分9a1’となる。そして、これにより、低伸長性シート9a’には、第1部分9a1’と第2部分9a2’とがCD方向に交互に形成される。
なお、前述の本実施形態では、低伸長性シート9aの伸縮性の発現を抑制する目的で、図7に示すように、波形ロール13uの山部13mをCD方向の所定位置Pkで切り欠いていたが、これと類似の構成を、当該図11A及び図11Bのロール機構13’に対して適用しても良い。すなわち、図11Bに示すように、一対のロール13u’,13d’のうちの少なくとも一方のロール13u’の各大径部分13m’を回転方向の所定位置Pk’で切り欠いて、これにより大径部分13m’を非連続に設けても良い。そして、このようにすれば、当該所定位置Pk’では大径部分13m’が存在しないために、同位置Pk’では、上記の三点曲げ状の延伸処理は行われず、よって、少なくとも当該位置Pk’では、伸縮性の発現が抑制される。その結果、低伸長性シート9a’のCD方向の伸縮性の発現は全体として抑制されることになる。
また、伸縮性シート8aをCD方向に伸長する装置としては、適宜な拡幅装置(不図示)を例示できる。例えば、拡幅装置は、伸縮性シート8aのCD方向の各端部にそれぞれ対応して設けられた一対のローラーを有し、各ローラーは、自身の外周面を伸縮性シート8aに当接させながら、同シート8aをMD方向の下流側へ送り出すように駆動回転する。また、同シート8aと当接する位置において、各ローラーの回転方向は、MD方向に沿う方向よりも若干CD方向の外側を向いている。よって、各ローラーの位置を通過する際に、同シート8aは、各ローラーによってCD方向の両側へと引っ張られ、これにより、同シート8aはCD方向の両側に伸長される。 Further, as an apparatus for alternately forming the first portion 9a1 ′ and the second portion 9a2 ′ in the CD direction with respect to the low-extension sheet 9a ′, a roll mechanism 13 ′ as shown in FIGS. 11A and 11B can be exemplified. . 11A is a schematic front view of the roll mechanism 13 ′ viewed from the downstream side in the MD direction, and FIG. 11B is a view taken along the line BB in FIG. 11A.
Theroll mechanism 13 ′ has a pair of upper and lower rolls 13u ′ and 13d ′ that rotate about a rotation axis along the CD direction. The upper roll 13u ′ has a large diameter portion 13m ′ and a small diameter portion 13v ′ alternately in the CD direction. Similarly, the lower roll 13d ′ also has a large diameter portion 13m ′ and a small diameter portion 13v ′ in the CD direction. Have alternately. These rolls 13u ′ and 13d ′ are arranged one above the other while inserting their own large diameter portion 13m ′ in the space near the counterpart small diameter portion 13v ′, thereby rotating the rolls 13u ′ and 13d ′. The large diameter portions 13m 'and 13m' are meshed with each other in the direction Ab. Further, the low extensible sheet 9a is passed along the MD direction between the rolls 13u ′ and 13d ′.
Therefore, the low-extensible sheet 9a that is passing is between the large-diameter portions 13m ′ and 13m ′ adjacent to each other in the one roll 13u ′ (13d ′) and between the large-diameter portions 13m ′ and 13m ′. It is deformed into a three-point bend by the large diameter portion 13m ′ of the other roll 13d ′ (13u ′) entering the small diameter portion 13v ′. At this time, the portion 9a2 ′ that comes into contact with the top surface of the large-diameter portion 13m ′ of one roll 13u ′ (13d ′) in the low-extension sheet 9a ′ is in contact with the top surface so as to be relatively unmovable. As a result, the second portion 9a2 ′ is substantially unstretched, and the portion 9a2 is in contact with the top surface of the large-diameter portion 13m ′ of the other roll 13d ′ (13u ′) in the sheet 9a ′. 'Also comes into contact with the top surface so as not to be relatively movable, and thereby becomes the above-described second portion 9a2' without being generally stretched. However, the portion 9a1 ′ between the two second portions 9a2 ′ and 9a2 ′ is stretched based on the entry of the large-diameter portion 13m ′, whereby the portion 9a1 ′ 1 portion 9a1 ′. And thereby, 1st part 9a1 'and 2nd part 9a2' are alternately formed in CD direction in low extensible sheet | seat 9a '.
In the present embodiment described above, thepeak portion 13m of the corrugated roll 13u is cut out at a predetermined position Pk in the CD direction, as shown in FIG. 7, for the purpose of suppressing the development of stretchability of the low-extension sheet 9a. However, a configuration similar to this may be applied to the roll mechanism 13 ′ of FIGS. 11A and 11B. That is, as shown in FIG. 11B, each large-diameter portion 13m ′ of at least one roll 13u ′ of the pair of rolls 13u ′ and 13d ′ is cut out at a predetermined position Pk ′ in the rotation direction, thereby The portion 13m ′ may be provided discontinuously. In this case, since the large-diameter portion 13m ′ does not exist at the predetermined position Pk ′, the above-described three-point bending-shaped stretching process is not performed at the position Pk ′, and thus at least the position Pk. In ', the expression of elasticity is suppressed. As a result, the expression of stretchability in the CD direction of the low stretch sheet 9a ′ is suppressed as a whole.
Moreover, as an apparatus which expand | extends theelastic sheet 8a to CD direction, a suitable widening apparatus (not shown) can be illustrated. For example, the widening device has a pair of rollers provided corresponding to each end of the stretchable sheet 8a in the CD direction, and each roller abuts its outer peripheral surface against the stretchable sheet 8a. The sheet 8a is driven to rotate so as to be sent to the downstream side in the MD direction. Moreover, in the position which contacts the sheet 8a, the rotation direction of each roller is slightly outward in the CD direction from the direction along the MD direction. Therefore, when passing the position of each roller, the sheet 8a is pulled to both sides in the CD direction by each roller, and thereby the sheet 8a is extended to both sides in the CD direction.
当該ロール機構13’は、CD方向に沿った回転軸回りに回転する上下一対のロール13u’,13d’を有する。上ロール13u’は、大径部分13m’と小径部分13v’とをCD方向に交互に有し、同様に、下ロール13d’も、大径部分13m’と小径部分13v’とをCD方向に交互に有する。そして、これらロール13u’,13d’は、互いに、相手の小径部分13v’の近傍空間に自身の大径部分13m’を挿入しながら上下に配置され、これにより、ロール13u’,13d’の回転方向の一部Abにおいて互いの大径部分13m’,13m’を噛み合わせている。また、当該ロール13u’,13d’同士の間に低伸長性シート9aがMD方向に沿って通される。
よって、当該通過中の低伸長性シート9aは、一方のロール13u’(13d’)において互いに隣り合う大径部分13m’,13m’同士と、当該大径部分13m’,13m’同士の間の小径部分13v’に入り込む他方のロール13d’(13u’)の大径部分13m’とによって、三点曲げ状に変形される。そして、このときには、低伸長性シート9a’において一方のロール13u’(13d’)の大径部分13m’の頂面と当接する部分9a2’は、当該頂面に概ね相対移動不能に当接して、これにより、概ね延伸されずに上述の第2部分9a2’となり、また、同じく、同シート9a’において他方のロール13d’(13u’)の大径部分13m’の頂面と当接する部分9a2’も、当該頂面に概ね相対移動不能に当接して、これにより、概ね延伸されずに前述の第2部分9a2’となる。しかし、これら二つの第2部分9a2’,9a2’同士の間の部分9a1’は、上述の大径部分13m’の入り込みに基づいて延伸されて、これにより、当該部分9a1’は、前述の第1部分9a1’となる。そして、これにより、低伸長性シート9a’には、第1部分9a1’と第2部分9a2’とがCD方向に交互に形成される。
なお、前述の本実施形態では、低伸長性シート9aの伸縮性の発現を抑制する目的で、図7に示すように、波形ロール13uの山部13mをCD方向の所定位置Pkで切り欠いていたが、これと類似の構成を、当該図11A及び図11Bのロール機構13’に対して適用しても良い。すなわち、図11Bに示すように、一対のロール13u’,13d’のうちの少なくとも一方のロール13u’の各大径部分13m’を回転方向の所定位置Pk’で切り欠いて、これにより大径部分13m’を非連続に設けても良い。そして、このようにすれば、当該所定位置Pk’では大径部分13m’が存在しないために、同位置Pk’では、上記の三点曲げ状の延伸処理は行われず、よって、少なくとも当該位置Pk’では、伸縮性の発現が抑制される。その結果、低伸長性シート9a’のCD方向の伸縮性の発現は全体として抑制されることになる。
また、伸縮性シート8aをCD方向に伸長する装置としては、適宜な拡幅装置(不図示)を例示できる。例えば、拡幅装置は、伸縮性シート8aのCD方向の各端部にそれぞれ対応して設けられた一対のローラーを有し、各ローラーは、自身の外周面を伸縮性シート8aに当接させながら、同シート8aをMD方向の下流側へ送り出すように駆動回転する。また、同シート8aと当接する位置において、各ローラーの回転方向は、MD方向に沿う方向よりも若干CD方向の外側を向いている。よって、各ローラーの位置を通過する際に、同シート8aは、各ローラーによってCD方向の両側へと引っ張られ、これにより、同シート8aはCD方向の両側に伸長される。 Further, as an apparatus for alternately forming the first portion 9a1 ′ and the second portion 9a2 ′ in the CD direction with respect to the low-
The
Therefore, the low-
In the present embodiment described above, the
Moreover, as an apparatus which expand | extends the
上述の実施形態では、図4Aに示すように、外装シート収縮処理部30は、第1の伸長状態の外装シート7aを収縮する機構として一対のニップロール機構31,33を有していたが、外装シート7aを収縮可能な機構であれば、何等これに限らない。例えば、上記の一対のニップロール機構31,33に代えて、図12に示すような一対のS掛けロール機構31’,33’を設けても良い。すなわち、各S掛けロール機構31’(33’)は、互いの外周面を対向させながらCD方向に沿った回転軸回りに駆動回転する一対のロール31u’,31u’(33u’,33d’)を有し、そして、当該一対のロール31u’,31d’(33u’,33d’)に対してS字状に外装シート7aを掛け回すように構成されている。よって、かかる構成によれば、各ロール31u’,31d’(33u’,33d’)の外周面で概ね相対滑り無く外装シート7aを保持することができて、これらロール31u’,31d’(33u’,33d’)の駆動回転に基づいて、ロール31u’,31d’(33u’,33d’)の周速値を外装シート7aの搬送速度値として同シート7aを搬送することができる。そのため、かかるS掛けロール機構31’,33’を前述のニップロール機構31,33の代わりに用いることができる。ちなみに、図12の例では、一対のニップロール機構31,33の両方をそれぞれS掛けロール機構31’,33’に置換しているが、場合によっては、どちらか一方のニップロール機構31(33)だけをS掛けロール機構31(33)に置換しても良い。
In the above-described embodiment, as illustrated in FIG. 4A, the exterior sheet contraction processing unit 30 has the pair of nip roll mechanisms 31 and 33 as the mechanism for contracting the first expanded exterior sheet 7 a. The mechanism is not limited to this as long as the mechanism can contract the sheet 7a. For example, instead of the pair of nip roll mechanisms 31 and 33, a pair of S hanging roll mechanisms 31 'and 33' as shown in FIG. 12 may be provided. That is, each S-hanging roll mechanism 31 ′ (33 ′) is a pair of rolls 31u ′ and 31u ′ (33u ′ and 33d ′) that are driven and rotated around the rotation axis along the CD direction with their outer peripheral surfaces facing each other. And the exterior sheet 7a is hung around the pair of rolls 31u ′, 31d ′ (33u ′, 33d ′) in an S shape. Therefore, according to such a configuration, the outer sheet 7a can be held on the outer peripheral surface of each roll 31u ′, 31d ′ (33u ′, 33d ′) with almost no relative slip, and these rolls 31u ′, 31d ′ (33u) can be held. Based on the drive rotation of ', 33d'), the sheet 7a can be transported using the peripheral speed values of the rolls 31u ', 31d' (33u ', 33d') as the transport speed value of the exterior sheet 7a. Therefore, the S hanging roll mechanisms 31 ′ and 33 ′ can be used in place of the nip roll mechanisms 31 and 33 described above. Incidentally, in the example of FIG. 12, both of the pair of nip roll mechanisms 31 and 33 are replaced with S hanging roll mechanisms 31 ′ and 33 ′, respectively, but depending on the case, only one of the nip roll mechanisms 31 (33) is used. May be replaced with the S hanging roll mechanism 31 (33).
1 使い捨ておむつ(吸収性物品)、
3 吸収性本体、3e 端部、
3a 吸収性本体の連続体、
3c 吸収性コア、
4 トップシート、4eL 飛び出した部分、
5 防漏シート、5eL 飛び出した部分、5eW 飛び出した部分、
7 外装シート、7HL 脚回り開口部、
7f 腹側部、7c 股下部、7b 背側部、7eW 端部、
7a 外装シートの連続シート(複合シート、外装シート、基材シート)、
8 内層シート(伸縮性シート)、
8a 伸縮性シートの連続シート(伸縮性シート)、
8a’ 伸縮性シートの連続シート(伸縮性シート)、
9 外層シート(低伸長性シート)、
9a 低伸長性シートの連続シート(低伸長性シート)、
9a’ 低伸長性シートの連続シート(低伸長性シート)、
9a1 第1部分、9a1’ 第1部分、
9a2 第2部分、9a2’ 第2部分、
10 外装シート生成処理部、
11 加工装置、
12 搬送機構、12R 搬送ローラー、
13 波形ロール機構、
13u 波形ロール(ロール)、13u’ ロール、
13d 波形ロール(ロール)、13d’ ロール、
13m 山部、13m’ 大径部分、
13v 谷部、13v’ 小径部分、
14a 予熱ローラー、14a 予熱ロール、
15 接合装置、
16 ニップロール機構、16R ニップロール、
17 超音波溶着装置、
17a アンビルローラー、
17at 突部、17an 非存在部分、
17h ホーン、17hs 振動面、
18R 搬送ローラー、
19u 上ロール、19d 下ロール、
20 脚回り開口部形成処理部、
21 ダイカッター装置、21c カッター刃、
21u カッターロール、21d アンビルロール、
30 外装シート収縮処理部(収縮装置)、30’ 外装シート収縮処理部(収縮装置)、
31 上流側ニップロール機構、31u 上ニップロール、31d 下ニップロール、
33 下流側ニップロール機構、33u 上ニップロール、33d 下ニップロール、
31’ S掛けロール機構、31u’ 上ロール、31d’ 下ロール、
33’ S掛けロール機構、33u’ 上ロール、33d’ 下ロール、
40 吸収性本体取り付け処理部、
41 回転ドラム装置、42 回転ドラム、43 保持パッド、45 カッター装置、
50 二つ折り処理部、
60 エンドシール処理部、
61 ヒートシール加工装置、61u 上ロール、61d 下ロール、
61sp シールパターン部、
70 分断処理部、
71 ロータリーカッター装置、71c カッター刃、
71u 上ロール(カッターロール)、71d 下ロール(アンビルロール)、
HB 胴回り開口部、HL 脚回り開口部、
CV 搬送機構、
j 接合部、j’ 接合部、
jn 非接合部、jn’ 非接合部、
Rj 接合部列、
j3 接合部、j3L 縦長帯状部分、j3W 横長帯状部分、j3C 接合部、
C9a1 第1部分の中央位置、C9a1’ 第1部分の中央位置、
C9a2 第2部分の中央位置、C9a2’ 第2部分の中央位置、
Ab 一部、
LM 製造ライン、
Pk 所定位置、
S1 第1位置、S2 第2位置、
jes エンドシール部、
R30 搬送経路、 1 disposable diapers (absorbent articles),
3 Absorbent body, 3e end,
3a A continuous body of absorbent body,
3c absorbent core,
4 Top sheet, 4eL
5 Leak-proof sheet, 5eL, protruding part, 5eW, protruding part,
7 exterior sheet, 7HL leg opening,
7f ventral side, 7c crotch, 7b dorsal side, 7eW end,
7a Continuous sheet of exterior sheet (composite sheet, exterior sheet, base sheet),
8 Inner layer sheet (elastic sheet),
8a Continuous sheet of elastic sheet (elastic sheet),
8a 'Continuous sheet of elastic sheet (elastic sheet),
9 Outer layer sheet (low stretch sheet),
9a Continuous sheet of low stretch sheet (low stretch sheet),
9a 'Continuous sheet of low-extension sheet (low-extension sheet),
9a1 first part, 9a1 ′ first part,
9a2 second part, 9a2 ′ second part,
10 exterior sheet generation processing unit,
11 Processing equipment,
12 transport mechanism, 12R transport roller,
13 corrugated roll mechanism,
13u corrugated roll (roll), 13u 'roll,
13d corrugated roll (roll), 13d 'roll,
13m mountain, 13m 'large diameter part,
13v valley, 13v 'small diameter part,
14a preheating roller, 14a preheating roll,
15 joining device,
16 nip roll mechanism, 16R nip roll,
17 Ultrasonic welding equipment,
17a anvil roller,
17at protrusion, 17an non-existing part,
17h horn, 17hs vibrating surface,
18R transport roller,
19u upper roll, 19d lower roll,
20 leg opening formation processing section,
21 die cutter device, 21c cutter blade,
21u cutter roll, 21d anvil roll,
30 exterior sheet shrinkage processing unit (shrinking device), 30 'exterior sheet shrinkage processing unit (shrinking device),
31 upstream nip roll mechanism, 31u upper nip roll, 31d lower nip roll,
33 downstream nip roll mechanism, 33u upper nip roll, 33d lower nip roll,
31 'S hanging roll mechanism, 31u' upper roll, 31d 'lower roll,
33 'S hanging roll mechanism, 33u' upper roll, 33d 'lower roll,
40 Absorbent body attachment processing section,
41 rotating drum device, 42 rotating drum, 43 holding pad, 45 cutter device,
50 Folding processing part,
60 End seal processing section,
61 heat seal processing device, 61u upper roll, 61d lower roll,
61sp seal pattern part,
70 parting section,
71 Rotary cutter device, 71c Cutter blade,
71u Upper roll (cutter roll), 71d Lower roll (anvil roll),
HB waistline opening, HL leg opening,
CV transport mechanism,
j junction, j ′ junction,
jn non-joint, jn ′ non-joint,
Rj joint row,
j3 junction, j3L vertically long strip, j3W lateral strip, j3C joint,
C9a1 center position of the first part, C9a1 ′ center position of the first part,
C9a2 center position of the second part, C9a2 ′ center position of the second part,
Ab part,
LM production line,
Pk predetermined position,
S1 first position, S2 second position,
jes end seal part,
R30 transport route,
3 吸収性本体、3e 端部、
3a 吸収性本体の連続体、
3c 吸収性コア、
4 トップシート、4eL 飛び出した部分、
5 防漏シート、5eL 飛び出した部分、5eW 飛び出した部分、
7 外装シート、7HL 脚回り開口部、
7f 腹側部、7c 股下部、7b 背側部、7eW 端部、
7a 外装シートの連続シート(複合シート、外装シート、基材シート)、
8 内層シート(伸縮性シート)、
8a 伸縮性シートの連続シート(伸縮性シート)、
8a’ 伸縮性シートの連続シート(伸縮性シート)、
9 外層シート(低伸長性シート)、
9a 低伸長性シートの連続シート(低伸長性シート)、
9a’ 低伸長性シートの連続シート(低伸長性シート)、
9a1 第1部分、9a1’ 第1部分、
9a2 第2部分、9a2’ 第2部分、
10 外装シート生成処理部、
11 加工装置、
12 搬送機構、12R 搬送ローラー、
13 波形ロール機構、
13u 波形ロール(ロール)、13u’ ロール、
13d 波形ロール(ロール)、13d’ ロール、
13m 山部、13m’ 大径部分、
13v 谷部、13v’ 小径部分、
14a 予熱ローラー、14a 予熱ロール、
15 接合装置、
16 ニップロール機構、16R ニップロール、
17 超音波溶着装置、
17a アンビルローラー、
17at 突部、17an 非存在部分、
17h ホーン、17hs 振動面、
18R 搬送ローラー、
19u 上ロール、19d 下ロール、
20 脚回り開口部形成処理部、
21 ダイカッター装置、21c カッター刃、
21u カッターロール、21d アンビルロール、
30 外装シート収縮処理部(収縮装置)、30’ 外装シート収縮処理部(収縮装置)、
31 上流側ニップロール機構、31u 上ニップロール、31d 下ニップロール、
33 下流側ニップロール機構、33u 上ニップロール、33d 下ニップロール、
31’ S掛けロール機構、31u’ 上ロール、31d’ 下ロール、
33’ S掛けロール機構、33u’ 上ロール、33d’ 下ロール、
40 吸収性本体取り付け処理部、
41 回転ドラム装置、42 回転ドラム、43 保持パッド、45 カッター装置、
50 二つ折り処理部、
60 エンドシール処理部、
61 ヒートシール加工装置、61u 上ロール、61d 下ロール、
61sp シールパターン部、
70 分断処理部、
71 ロータリーカッター装置、71c カッター刃、
71u 上ロール(カッターロール)、71d 下ロール(アンビルロール)、
HB 胴回り開口部、HL 脚回り開口部、
CV 搬送機構、
j 接合部、j’ 接合部、
jn 非接合部、jn’ 非接合部、
Rj 接合部列、
j3 接合部、j3L 縦長帯状部分、j3W 横長帯状部分、j3C 接合部、
C9a1 第1部分の中央位置、C9a1’ 第1部分の中央位置、
C9a2 第2部分の中央位置、C9a2’ 第2部分の中央位置、
Ab 一部、
LM 製造ライン、
Pk 所定位置、
S1 第1位置、S2 第2位置、
jes エンドシール部、
R30 搬送経路、 1 disposable diapers (absorbent articles),
3 Absorbent body, 3e end,
3a A continuous body of absorbent body,
3c absorbent core,
4 Top sheet, 4eL
5 Leak-proof sheet, 5eL, protruding part, 5eW, protruding part,
7 exterior sheet, 7HL leg opening,
7f ventral side, 7c crotch, 7b dorsal side, 7eW end,
7a Continuous sheet of exterior sheet (composite sheet, exterior sheet, base sheet),
8 Inner layer sheet (elastic sheet),
8a Continuous sheet of elastic sheet (elastic sheet),
8a 'Continuous sheet of elastic sheet (elastic sheet),
9 Outer layer sheet (low stretch sheet),
9a Continuous sheet of low stretch sheet (low stretch sheet),
9a 'Continuous sheet of low-extension sheet (low-extension sheet),
9a1 first part, 9a1 ′ first part,
9a2 second part, 9a2 ′ second part,
10 exterior sheet generation processing unit,
11 Processing equipment,
12 transport mechanism, 12R transport roller,
13 corrugated roll mechanism,
13u corrugated roll (roll), 13u 'roll,
13d corrugated roll (roll), 13d 'roll,
13m mountain, 13m 'large diameter part,
13v valley, 13v 'small diameter part,
14a preheating roller, 14a preheating roll,
15 joining device,
16 nip roll mechanism, 16R nip roll,
17 Ultrasonic welding equipment,
17a anvil roller,
17at protrusion, 17an non-existing part,
17h horn, 17hs vibrating surface,
18R transport roller,
19u upper roll, 19d lower roll,
20 leg opening formation processing section,
21 die cutter device, 21c cutter blade,
21u cutter roll, 21d anvil roll,
30 exterior sheet shrinkage processing unit (shrinking device), 30 'exterior sheet shrinkage processing unit (shrinking device),
31 upstream nip roll mechanism, 31u upper nip roll, 31d lower nip roll,
33 downstream nip roll mechanism, 33u upper nip roll, 33d lower nip roll,
31 'S hanging roll mechanism, 31u' upper roll, 31d 'lower roll,
33 'S hanging roll mechanism, 33u' upper roll, 33d 'lower roll,
40 Absorbent body attachment processing section,
41 rotating drum device, 42 rotating drum, 43 holding pad, 45 cutter device,
50 Folding processing part,
60 End seal processing section,
61 heat seal processing device, 61u upper roll, 61d lower roll,
61sp seal pattern part,
70 parting section,
71 Rotary cutter device, 71c Cutter blade,
71u Upper roll (cutter roll), 71d Lower roll (anvil roll),
HB waistline opening, HL leg opening,
CV transport mechanism,
j junction, j ′ junction,
jn non-joint, jn ′ non-joint,
Rj joint row,
j3 junction, j3L vertically long strip, j3W lateral strip, j3C joint,
C9a1 center position of the first part, C9a1 ′ center position of the first part,
C9a2 center position of the second part, C9a2 ′ center position of the second part,
Ab part,
LM production line,
Pk predetermined position,
S1 first position, S2 second position,
jes end seal part,
R30 transport route,
Claims (11)
- 吸収性物品に係る伸縮性シートと、前記伸縮性シートよりも伸長性の低い低伸長性シートとを有した複合シートの製造方法であって、
所定方向に延伸された第1部分と、前記第1部分よりも延伸されていない第2部分とが前記所定方向に関して交互に並ぶように形成された前記低伸長性シートを準備することと、
前記伸縮性シートを伸縮方向に伸長した状態で、前記伸縮方向を前記所定方向に揃えつつ前記低伸長性シートに前記伸縮性シートを複数の接合部を介して固定することと、を有し、
前記固定することにおいては、前記複数の接合部を、前記伸縮方向及び前記伸縮方向と交差する方向の両方向について非連続に分散して設けるとともに、前記複数の接合部のうちで前記伸縮方向に隣り合う接合部同士の間に位置する非接合部に、前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ少なくとも一つずつ含まれるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造方法。 A method for producing a composite sheet having an elastic sheet according to an absorbent article and a low-extensible sheet having a lower extensibility than the elastic sheet,
Preparing the low stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction;
Fixing the stretchable sheet to the low stretchable sheet through a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet extended in the stretchable direction,
In the fixing, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and adjacent to the stretch direction among the plurality of joint portions. The non-joint portion located between the mating joint portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. The manufacturing method of the composite sheet which concerns on the absorbent article characterized by providing the said junction part. - 請求項1に記載の吸収性物品に係る複合シートの製造方法であって、
前記準備することにおいては、複数の前記第2部分が、前記所定方向に沿って所定の形成ピッチで並ぶように形成された前記低伸長性シートを準備し、
前記固定することにおいては、前記形成ピッチよりも、前記非接合部の前記伸縮方向の長さの方が大きくなるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造方法。 It is a manufacturing method of the composite sheet concerning the absorptive article according to claim 1,
In the preparation, preparing the low-extensible sheet formed such that a plurality of the second portions are arranged at a predetermined formation pitch along the predetermined direction,
In the fixing, in the composite sheet according to the absorbent article, the joining portion is provided so that the length in the expansion / contraction direction of the non-joining portion is larger than the formation pitch. Production method. - 請求項1に記載の吸収性物品に係る複合シートの製造方法であって、
前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ、複数個ずつ前記非接合部に含まれるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造方法。 It is a manufacturing method of the composite sheet concerning the absorptive article according to claim 1,
The joint portion is provided such that a plurality of center positions in the predetermined direction of the first portion and a center position in the predetermined direction of the second portion are included in the non-joint portion, respectively. A method for producing a composite sheet according to an absorbent article. - 請求項3に記載の吸収性物品に係る複合シートの製造方法であって、
前記準備することにおいては、複数の前記第2部分が、前記所定方向に沿って所定の形成ピッチで並ぶように形成された前記低伸長性シートを準備し、
前記固定することにおいては、前記形成ピッチの複数倍の大きさよりも、前記非接合部の前記伸縮方向の長さの方が大きくなるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造方法。 It is a manufacturing method of the composite sheet concerning the absorptive article according to claim 3,
In the preparation, preparing the low-extensible sheet formed such that a plurality of the second portions are arranged at a predetermined formation pitch along the predetermined direction,
In the fixing, the bonded article is provided so that the length of the non-bonded part in the expansion / contraction direction is larger than the multiple of the formation pitch. The manufacturing method of the composite sheet which concerns on this. - 請求項1乃至4の何れかに記載の吸収性物品に係る複合シートの製造方法であって、
前記低伸長性シートは、前記所定方向に連続した連続シートであり、
前記準備することにおいては、前記所定方向を搬送方向として前記低伸長性シートを搬送するとともに、当該搬送中の前記低伸長性シートに前記第1部分と前記第2部分とを形成し、
前記第1部分と前記第2部分とが形成された前記低伸長性シートを、巻き取らずに、前記固定することを行う位置へ向けて搬送することを特徴とする吸収性物品に係る複合シートの製造方法。 A method for producing a composite sheet according to any one of claims 1 to 4,
The low extensibility sheet is a continuous sheet continuous in the predetermined direction,
In the preparation, the low-extensible sheet is conveyed with the predetermined direction as the conveying direction, and the first and second portions are formed on the low-extensible sheet being conveyed,
A composite sheet according to an absorbent article, wherein the low-extensible sheet on which the first part and the second part are formed is transported toward a position where the fixing is performed without winding. Manufacturing method. - 請求項1乃至5の何れかに記載の吸収性物品に係る複合シートの製造方法であって、
前記低伸長性シートは、前記所定方向に連続した連続シートであり、
前記伸縮性シートは、前記伸縮方向に連続した連続シートであり、
前記固定することにおいては、前記伸縮性シートは前記伸縮方向を搬送方向として搬送されており、
前記低伸長性シートが固定された前記伸縮性シートが、前記固定することの後で前記搬送方向の所定位置を通過する際に、前記伸縮性シートのうちで前記所定位置を通過する部分を順次前記伸縮方向に収縮させることを特徴とする吸収性物品に係る複合シートの製造方法。 A method for producing a composite sheet according to any one of claims 1 to 5,
The low extensibility sheet is a continuous sheet continuous in the predetermined direction,
The stretchable sheet is a continuous sheet continuous in the stretch direction,
In the fixing, the stretchable sheet is transported with the stretch direction as the transport direction,
When the stretchable sheet to which the low stretchable sheet is fixed passes through the predetermined position in the transport direction after the fixing, the portions of the stretchable sheet that pass through the predetermined position are sequentially The manufacturing method of the composite sheet which concerns on the absorbent article characterized by shrinking | contracting in the said expansion-contraction direction. - 請求項1乃至6の何れかに記載の吸収性物品に係る複合シートの製造方法であって、
前記準備することにおいては、前記所定方向と交差する方向の所定位置に、前記所定方向に延伸されない部分が生じるようにしながら、前記低伸長性シートに上記第1部分と前記第2部分とを形成ことを特徴とする吸収性物品に係る複合シートの製造方法。 A method for producing a composite sheet according to any one of claims 1 to 6,
In the preparation, the first portion and the second portion are formed on the low stretch sheet while a portion that is not stretched in the predetermined direction is generated at a predetermined position in a direction intersecting the predetermined direction. The manufacturing method of the composite sheet which concerns on the absorbent article characterized by the above-mentioned. - 請求項7に記載の吸収性物品に係る複合シートの製造方法であって、
前記低伸長性シートは、前記所定方向に連続した連続シートであり、
互いの外周面を対向させながら前記搬送方向に沿って回転する一対のロール同士の間に前記低伸長性シートを通すことによって前記第1部分と前記第2部分とを形成し、
前記一対のロールは、それぞれ、回転方向に沿って各外周面に山部と谷部とが交互に形成された波形ロールであるとともに、前記一対のロール同士は、互いの前記山部が前記谷部に入り込むように噛み合って回転し、
前記一対のロールのうちの少なくとも一方のロールの前記山部は、前記ロールの回転軸に沿う方向に非連続に設けられていることを特徴とする吸収性物品に係る複合シートの製造方法。 It is a manufacturing method of the composite sheet concerning the absorptive article according to claim 7,
The low extensibility sheet is a continuous sheet continuous in the predetermined direction,
Forming the first part and the second part by passing the low extensible sheet between a pair of rolls rotating along the conveying direction while facing each other's outer peripheral surfaces;
The pair of rolls are corrugated rolls in which crests and troughs are alternately formed on each outer circumferential surface along the rotation direction, and the crests of the pair of rolls are such that the crests of each other are the troughs. Rotate by meshing to enter the part,
The method for producing a composite sheet according to an absorbent article, wherein the peak portions of at least one of the pair of rolls are provided discontinuously in a direction along a rotation axis of the roll. - 請求項8に記載の吸収性物品に係る複合シートの製造方法であって、
前記一対のロールのうちの他方のロールの前記山部は、前記ロールの回転軸に沿う方向に連続して設けられていることを特徴とする吸収性物品に係る複合シートの製造方法。 It is a manufacturing method of the composite sheet concerning the absorptive article according to claim 8,
The manufacturing method of a composite sheet according to an absorbent article, wherein the peak portion of the other roll of the pair of rolls is provided continuously in a direction along a rotation axis of the roll. - 請求項1乃至9の何れかに記載の吸収性物品に係る複合シートの製造方法であって、
前記固定することにおいては、前記伸縮性シートと前記低伸長性シートとを互いの厚さ方向に重ね合わせた状態で、前記伸縮性シートと前記低伸長性シートとを厚さ方向から一対の挟圧部材によって挟圧することにより、前記接合部を形成し、
前記一対の挟圧部材のうちの一方の挟圧部材は、前記低伸長性シートと対向する面に、複数の突部を前記複数の接合部が形成されるパターンで有し、他方の挟圧部材は、前記伸縮性シートと対向する面に、前記突部の頂面を受けるべく前記頂面よりも大きい面部を有することを特徴とする吸収性物品に係る複合シートの製造方法。 A method for producing a composite sheet according to any one of claims 1 to 9,
In the fixing, the stretchable sheet and the low stretchable sheet are stacked in the thickness direction with the stretchable sheet and the low stretchable sheet overlapped with each other in the thickness direction. By sandwiching with a pressure member, the joint is formed,
One clamping member of the pair of clamping members has a plurality of protrusions in a pattern in which the plurality of joints are formed on a surface facing the low-extensible sheet, and the other clamping pressure The member has a surface portion larger than the top surface so as to receive the top surface of the protrusion on a surface facing the stretchable sheet. A method for producing a composite sheet according to an absorbent article. - 吸収性物品に係る伸縮性シートと、前記伸縮性シートよりも伸長性の低い低伸長性シートとを有した複合シートの製造装置であって、
所定方向に延伸された第1部分と、前記第1部分よりも延伸されていない第2部分とが前記所定方向に関して交互に並ぶように形成された前記低伸長性シートを準備する装置と、
前記伸縮性シートを伸縮方向に伸長した状態で、前記伸縮方向を前記所定方向に揃えつつ前記低伸長性シートに前記伸縮性シートを複数の接合部を介して固定する装置と、を有し、
前記固定する装置では、前記複数の接合部を、前記伸縮方向及び前記伸縮方向と交差する方向の両方向について非連続に分散して設けるとともに、前記複数の接合部のうちで前記伸縮方向に隣り合う接合部同士の間に位置する非接合部に、前記第1部分の前記所定方向の中央位置と前記第2部分の前記所定方向の中央位置とが、それぞれ少なくとも一つずつ含まれるように、前記接合部を設けることを特徴とする吸収性物品に係る複合シートの製造装置。 An apparatus for producing a composite sheet having a stretchable sheet according to an absorbent article and a low stretchable sheet having a lower stretchability than the stretchable sheet,
An apparatus for preparing the low-stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction;
An apparatus for fixing the stretchable sheet to the low stretchable sheet via a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet stretched in the stretchable direction;
In the fixing device, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and are adjacent to the stretch direction among the plurality of joint portions. The non-joining portion located between the joining portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. An apparatus for manufacturing a composite sheet according to an absorbent article, wherein a bonding portion is provided.
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Citations (5)
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JPH07213554A (en) * | 1994-02-04 | 1995-08-15 | New Oji Paper Co Ltd | Manufacture of sheet-type elastic combination |
JPH10245757A (en) * | 1997-02-25 | 1998-09-14 | Kuraray Co Ltd | Sheet-formed elastic composite material |
WO2006073975A1 (en) * | 2004-12-30 | 2006-07-13 | Kimberly-Clark Worldwide, Inc. | Extensible and stretch laminates with comparably low cross-machine direction tension and methods of making same |
WO2008066007A1 (en) * | 2006-11-27 | 2008-06-05 | Uni-Charm Corporation | Absorbent article and composite sheet |
JP2011214201A (en) * | 2010-03-31 | 2011-10-27 | Unicharm Corp | Elastic nonwoven fabric and method of manufacturing the same |
-
2014
- 2014-04-28 JP JP2014092664A patent/JP5830570B2/en active Active
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2015
- 2015-01-20 WO PCT/JP2015/051386 patent/WO2015166672A1/en active Application Filing
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07213554A (en) * | 1994-02-04 | 1995-08-15 | New Oji Paper Co Ltd | Manufacture of sheet-type elastic combination |
JPH10245757A (en) * | 1997-02-25 | 1998-09-14 | Kuraray Co Ltd | Sheet-formed elastic composite material |
WO2006073975A1 (en) * | 2004-12-30 | 2006-07-13 | Kimberly-Clark Worldwide, Inc. | Extensible and stretch laminates with comparably low cross-machine direction tension and methods of making same |
WO2008066007A1 (en) * | 2006-11-27 | 2008-06-05 | Uni-Charm Corporation | Absorbent article and composite sheet |
JP2011214201A (en) * | 2010-03-31 | 2011-10-27 | Unicharm Corp | Elastic nonwoven fabric and method of manufacturing the same |
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