WO2011025032A1 - Method for producing absorbent article and stretching device - Google Patents
Method for producing absorbent article and stretching device Download PDFInfo
- Publication number
- WO2011025032A1 WO2011025032A1 PCT/JP2010/064812 JP2010064812W WO2011025032A1 WO 2011025032 A1 WO2011025032 A1 WO 2011025032A1 JP 2010064812 W JP2010064812 W JP 2010064812W WO 2011025032 A1 WO2011025032 A1 WO 2011025032A1
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- WIPO (PCT)
- Prior art keywords
- composite sheet
- sheet
- adhesive
- absorbent article
- sheets
- Prior art date
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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
- 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
- A61F13/49007—Form-fitting, self-adjusting disposable diapers
- A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
- A61F13/4902—Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
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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
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15585—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
- A61F13/15593—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers having elastic ribbons fixed thereto; Devices for applying the ribbons
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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
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
- A61F13/15731—Treating webs, e.g. for giving them a fibrelike appearance, e.g. by embossing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/18—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets by squeezing between surfaces, e.g. rollers
Definitions
- the present invention relates to a method for manufacturing an absorbent article comprising at least a composite sheet in which a plurality of sheets are bonded together with an adhesive, and an absorbent body attached to the composite sheet, and a stretching apparatus used in the method for manufacturing the absorbent article. About.
- Absorbent articles such as sanitary napkins and diapers include a liquid-permeable top sheet that allows liquid to pass through, a liquid-impermeable back sheet that does not pass liquid, and an absorber provided between the top sheet and the back sheet.
- the back sheet is composed of a back film and a back nonwoven fabric provided outside the back film.
- the back sheet is an inelastic material, and when used as it is, the texture is not good. Therefore, the back sheet is subjected to a treatment for improving flexibility and texture. For example, a gear stretching method is disclosed (see Patent Document 1).
- the gear stretching method is a method in which a back sheet is passed between a pair of rolls having gear teeth meshing with each other to form unevenness in the thickness direction on the back sheet. Thereby, the back sheet is deformed into a shape along the gear teeth. Therefore, the back sheet is stretched in the width direction. Moreover, since the back sheet is thinned in the thickness direction as a result of being stretched in the width direction, the rigidity of the back sheet can be reduced.
- the degree of stretching is greatly different between a portion where the adhesive is applied and a portion where the adhesive is not applied.
- a method is known in which the back sheet is heated when the back sheet is bitten by the gear teeth by heating the gear teeth. According to this method, the adhesive material is softened, and it becomes easy to adapt to the unevenness of the gear teeth, so that the difference between the degree of stretching of the part where the adhesive is applied and the degree of stretching of the part where the adhesive is not applied can be reduced.
- the conventional gear stretching method described above has the following problems. That is, the adhesive must be softened for a short period of time when the back sheet passes between a pair of rolls having gear teeth, and the temperature of the gear teeth must be increased as much as possible or the conveying speed must be delayed.
- the back nonwoven fabric is reduced in weight by the gear teeth pushing the back sheet, so if the heat transfer is insufficient, the back sheet will have uneven weight, and there will be holes (pinholes). It tends to occur. Moreover, when the temperature of the gear teeth is too high, there is a problem that the fibers of the back nonwoven fabric are thermally fused and hardened, and the texture is deteriorated.
- the manufacturing method according to the first feature includes a composite sheet (back sheet 20) in which a plurality of sheets (for example, the back film 20A and the back nonwoven fabric 20B) are bonded together with an adhesive, and an absorbent body that is bonded to the composite sheet ( An absorbent article comprising at least an absorber 30).
- the manufacturing method of an absorbent article is a process A in which the composite sheet conveyed along the conveyance direction is heated by a heating roll (heating roll 510) rotating along the conveyance direction (machine direction MD) of the composite sheet.
- a step B sheet stretching step S30 of stretching the composite sheet in a crossing direction (crossing direction CD) orthogonal to the transport direction by a pair of stamping roll mechanisms (embossing roll mechanism 520);
- the composite sheet is heated to a temperature higher than the softening point of the adhesive and lower than the lowest softening temperature among the softening temperatures of the plurality of sheets.
- Protrusion of the number is higher than 40 degrees, and is heated to a temperature lower than the softening point of the adhesive.
- FIG. 1 is a plan view showing an absorbent article 1 according to this embodiment.
- FIG. 2 is a cross-sectional view (AA cross-sectional view of FIG. 1) showing the absorbent article 1 according to the present embodiment.
- FIG. 3 is a cross-sectional view (BB cross-sectional view of FIG. 1) showing the absorbent article 1 according to the present embodiment.
- Fig.4 (a) is a top view which shows the back surface sheet 20 which concerns on this embodiment (the 1).
- FIG. 4B is an enlarged cross-sectional view (AA cross-sectional view of FIG. 4A) showing the back sheet 20 according to the present embodiment.
- FIG. 5 is a plan view showing the back sheet 20 according to the present embodiment (No. 2).
- FIG. 1 is a plan view showing an absorbent article 1 according to this embodiment.
- FIG. 2 is a cross-sectional view (AA cross-sectional view of FIG. 1) showing the absorbent article 1 according to the present embodiment.
- FIG. 3 is a cross-sectional
- FIG. 6 is a diagram for explaining a method for manufacturing an absorbent article according to the present embodiment.
- FIG. 7A is an enlarged perspective view showing a part of the stretching apparatus 500 according to the present embodiment.
- FIG. 7B is an axial sectional view of the embossing roll mechanism 520 according to the present embodiment.
- FIG. 8 is a perspective view showing the widening roll mechanism 600 according to the present embodiment.
- FIG. 1 is a plan view showing an absorbent article 1 according to this embodiment.
- FIG. 2 is a cross-sectional view (AA cross-sectional view of FIG. 1) showing the absorbent article 1 according to the present embodiment.
- FIG. 3 is a cross-sectional view (BB cross-sectional view of FIG. 1) showing the absorbent article 1 according to the present embodiment.
- the absorbent article 1 is an open diaper.
- the absorbent article 1 has a vertically long shape in a direction (hereinafter, referred to as a longitudinal direction L) from the wearer's front waistline (belly side) to the back waistline (back side).
- a longitudinal direction L a direction from the wearer's front waistline (belly side) to the back waistline (back side).
- the absorbent article 1 corresponds to the front waistline region S1 corresponding to the wearer's front waistline, the rear waistline region S2 corresponding to the wearer's back waistline, the wearer's inseam, and the front waistline region.
- the absorbent article 1 has a center region C1 including an absorber 30 described later in the width direction W orthogonal to the longitudinal direction L, and a pair of side regions located outside the center region C1 with respect to the width direction W. C2.
- Such an absorbent article 1 includes a top sheet 10, a back sheet 20, and an absorber 30. Further, the absorbent article 1 is provided with a waist flap portion 40 and a side flap portion 50.
- the top sheet 10 is provided on the side in contact with the wearer's skin.
- the top sheet 10 is disposed so as to wrap the absorber 30.
- the top sheet 10 is formed of a liquid-permeable sheet such as a hydrophilic nonwoven fabric or woven fabric, an apertured plastic film, or an apertured hydrophobic nonwoven fabric.
- the back sheet 20 is provided outside the absorbent article 1 when worn.
- the back sheet 20 is formed of a liquid-impermeable (eg, polyethylene) sheet-like back film 20A that does not transmit liquid, and a sheet-like back nonwoven fabric 20B provided outside the back film.
- the back sheet 20 constitutes a composite sheet in which a plurality of sheets are bonded together with an adhesive. Details of the back sheet 20 will be described later.
- the absorber 30 is provided between the top sheet 10 and the back sheet 20.
- the absorber 30 absorbs the body fluid of the wearer.
- the absorber 30 is formed of a mixed powder 30A such as pulverized pulp or a superabsorbent polymer, and a covering material 30B such as a tissue that covers the mixed powder 30A.
- the waist flap portion 40 is provided in the front waistline region S1 and the back waistline region S2 with respect to the longitudinal direction L.
- the waist flap portion 40 has a pair of front flap portions 40A located in the front waistline region S1 and a pair of rear flap portions 40B located in the rear waistline region S2.
- 40 A of front side flap parts are formed when the side sheet
- 40 A of front side flap parts may be formed when the back nonwoven fabric 20B extends instead of the side sheet 60.
- the rear side flap part 40B is formed by extending the side seat 60 toward the outer side in the width direction W similarly to the front side flap part 40A.
- the back side flap part 40B may be formed by extending the back nonwoven fabric 20B instead of the side sheet 60 similarly to the front side flap part 40A.
- a locking portion 41 that locks to the front waistline region S1 is provided on the surface of the rear flap portion 40B on the side where the absorber 30 is provided.
- the locking portion 41 is formed by, for example, a hook-and-loop fastener.
- the locking portion 41 is a male member, and a female member is provided as a locked portion in a region where the locking portion 41 of the front waistline region S1 is locked.
- region S1 itself may fulfill
- the side flap part 50 is provided along the longitudinal direction L outside the absorbent body 30 in the width direction W outside.
- the side flap portion 50 is provided with a string-like body 51 made of rubber (for example, polyurethane) having elasticity in the longitudinal direction L.
- the string-like body 51 is joined to the back sheet 20 in a state of being stretched in the longitudinal direction L.
- the string-like body 51 includes a first string-like body 51A, a second string-like body 51B, a third string-like body 51C, and a fourth string-like body 51D from the inner side to the outer side in the width direction W.
- FIG.4 (a) is a top view which shows the back surface sheet 20 which concerns on this embodiment.
- FIG. 4B is an enlarged cross-sectional view (AA cross-sectional view of FIG. 4A) showing the back sheet 20 according to the present embodiment.
- the back sheet 20 has a stretched portion 21 and an unstretched portion 22.
- the extending portion 21 is formed by pressing the back sheet 20 in the thickness direction T of the back sheet 20. That is, the stretched portion 21 is a region having a smaller basis weight (mass per unit area) than that of the unstretched portion 22 by being subjected to stretching.
- the stretched portion 21 is formed by alternately arranging a rough portion 21L having a large stretch amount and a dense portion 21T having an expansion amount smaller than the coarse portion 21L.
- the coarse portion 21L and the dense portion 21T are arranged in a state of being continuous in the longitudinal direction L and being arranged in the width direction W.
- the extending portion 21 has a central extending portion 21A located in the central region C1 and an end extending portion 21B located in a part of the side region C2.
- the part of the side region C2 indicates the crotch region S3 excluding the edge region C3 including the edge portion 20E located on the outer side in the width direction W.
- the end extension portion 21B is not necessarily provided in a part of the side region C2, and may be provided in the entire side region C2, and is provided in the crotch region S3 as shown in FIG. It does not have to be done.
- the central extension portion 21A does not necessarily have to be provided in the entire region of the central region C1, and may be provided in at least a part of the central region C1, for example, on the outer side in the longitudinal direction L as shown in FIG. You may provide in the center area
- Such a stretched portion 21 is preferably expanded by 3.0 times or less with respect to the back sheet 20 before the back sheet 20 is stretched. Moreover, the extending
- the back sheet 20 is not pressed in the thickness direction T. That is, the unstretched portion 22 is a region excluding the stretched portion 21 in the back sheet 20.
- the unstretched portion 22 is provided in the pair of side regions C2.
- FIG. 6 is a diagram for explaining a method for manufacturing an absorbent article according to the present embodiment.
- the manufacturing method of an absorbent article manufactures the absorbent article 1 provided with the back sheet 20 and the absorber 30 at least.
- the manufacturing method of the absorbent article includes a sheet bonding step S10, a sheet heating step S20, a sheet stretching step S30, a sheet widening step S40, an absorbent body joining step S50, a string-like body arranging step S60, and a side flap. It includes a forming step S70, a waist flap arranging step S80, and a product cutting step S90.
- an adhesive for example, hot melt
- the back sheet 120A in which the back film 20A is continuous and the nonwoven sheet 120B in which the back nonwoven fabric 20B is continuous hereinafter, machine direction MD.
- the composite sheet 120 is formed by bonding together while being conveyed.
- the composite sheet 120 is heated by a heating roll 510 described later. At this time, the composite sheet 120 is heated to a temperature higher than the softening point of the adhesive and lower than the lowest softening temperature (for example, the back film 20A) among the softening temperatures of the plurality of sheets. In particular, the composite sheet 120 is heated to a temperature of at least 20 degrees below the lowest softening temperature of the plurality of sheets.
- the heated composite sheet 120 is pressed in the thickness direction T of the composite sheet 120 by a stamping roll mechanism 520 described later.
- the composite sheet 120 is stretched in the width direction W of the composite sheet 120 (that is, the cross direction CD orthogonal to the machine direction MD), and the stretched portion 21 and the unstretched portion 22 are formed in the composite sheet 120.
- the convex part (the convex part 532 and the convex part 542) of the embossing roll mechanism 520 described later is heated to a temperature higher than 40 degrees and lower than the softening point of the adhesive.
- the stretched composite sheet 120 is widened (expanded) by the widening roll mechanism 600 described later until the composite sheet 120 becomes flat toward the outside in the width direction W of the composite sheet 120.
- the absorber 30 to which the top sheet 10 is bonded is bonded (placed) on the widened composite sheet 120.
- the string-like body 51 is placed on the composite sheet 120 corresponding to the outer side in the width direction W of the absorbent body 30 with the string-like body 51 extended with respect to the machine direction MD of the composite sheet 120. To place.
- the nonwoven fabric sheet 120B extending in the width direction W with respect to the back sheet 120A is folded back inward in the width direction W, thereby wrapping the string-like body 51 with the nonwoven fabric sheet 120B and forming the side flap portion 50. To do.
- the front flap portion 40A formed in advance and the rear flap portion 40B to which the locking portion 41 is attached are joined to the composite sheet 120.
- the composite sheet 120 provided with the absorber 30, the side flap part 50, and the waist flap part 40 is cut
- FIG. 7A is an enlarged perspective view showing a part of the stretching apparatus 500 according to the present embodiment.
- FIG. 7B is an axial sectional view of the embossing roll mechanism 520 according to the present embodiment.
- the stretching device 500 stretches the composite sheet 120 in which the back sheet 120A and the nonwoven fabric sheet 120B are bonded together in the cross direction CD while being conveyed along the machine direction MD.
- the composite sheet 120 is joined by an adhesive applied in a spiral pattern.
- the stretching apparatus 500 includes a heating roll 510 and an embossing roll mechanism 520.
- the heating roll 510 is provided on the upstream side in the machine direction MD from the embossing roll mechanism 520.
- the heating roll 510 heats the composite sheet 120 before passing through the embossing roll mechanism 520 while rotating along the machine direction MD.
- the heating roll 510 is set to a predetermined temperature. Specifically, the heating roll 510 has the composite sheet 120 higher than the softening point of the adhesive and lower than the lowest softening temperature (for example, the back film 20A) among the softening temperatures (so-called melting points) of the plurality of sheets. It has the 1st heating part (not shown) heated to low temperature.
- the embossing roll mechanism 520 heats the composite sheet 120 that has passed through the heating roll 510 and presses the composite sheet 120 in the thickness direction T of the composite sheet 120.
- the embossing roll mechanism 520 is set to a predetermined temperature.
- the embossing roll mechanism 520 is a second heating that heats a plurality of convex portions (the convex portions 532 and the convex portions 542) described later to a temperature higher than 40 degrees and lower than the softening point of the adhesive. Part (not shown).
- such an embossing roll mechanism 520 has a plurality of convex portions (so-called stretched blades) formed on the outer periphery, and sandwiches the composite sheet 120 between one convex portion 532.
- the other convex part 542 is comprised by a pair of roll mechanism which fits.
- the shapes of the convex portion 532 and the convex portion 542 are tapered from the outer periphery to the outer side of the roll mechanism in the cross section in the axial direction of the roll mechanism.
- the shape of the convex part 532 and the convex part 542 is a substantially triangular shape in the cross section in the axial direction of a roll mechanism.
- Ferritic stainless steel (SUS430 2B) is used for the convex portions 532 and the convex portions 542.
- the thickness t1 of the convex portion 532 and the thickness t2 of the convex portion 542 are 0.7 to 1.0 mm, respectively.
- the outer surface of the convex part 532 and the convex part 542 is polished.
- the temperature of the heating roll 510 is 100 degrees.
- the temperature of the embossing roll mechanism 520 is 60 degrees.
- the length (L) along the direction orthogonal to the axial direction of the roll mechanism when the convex portion 532 and the convex portion 542 are fitted is 1.6 mm.
- the interval (p1) between the plurality of projections 532 and the interval (p2) between the plurality of projections 542 are 2.5 mm. Under these conditions, the stretching apparatus 500 can perform a 1.3-fold stretching process on the composite sheet 120 before the composite sheet 120 is stretched.
- the magnification (stretching ratio) at which the composite sheet 120 is stretched in the width direction W can be changed by appropriately changing the above-described various conditions.
- region C2 of the composite sheet 120 may differ. Thereby, the draw ratio in the center area
- FIG. 8 is a perspective view showing the widening roll mechanism 600 according to the present embodiment.
- the widening roll mechanism 600 widens the composite sheet 120 stretched by the embossing roll mechanism 520 toward the outside in the cross direction CD of the composite sheet 120 until it becomes flat. As a result, the extending portion 21 (the rough portion 21L and the dense portion 21T) provided in the composite sheet 120 becomes flat, and the extending portion 21 widens.
- the widening roll mechanism 600 includes a first expansion roll mechanism 610 and a second expansion roll mechanism 620.
- the first expansion roll mechanism 610 sandwiches one side portion 120E1 of the composite sheet 120.
- the first expansion roll mechanism 610 includes a first upper pressing roll 611 and a first lower pressing roll 612.
- the first upper pressing roll 611 is disposed on one surface side (upper surface side) of the composite sheet 120.
- the first upper pressing roll 611 rotates along the feeding direction of feeding the composite sheet 120 around the axis while being in contact with the upper surface of the composite sheet 120.
- the first lower pressing roll 612 is disposed on the opposite side (lower surface side) of the first upper pressing roll 611 with the composite sheet 120 interposed therebetween.
- the first lower pressing roll 612 sandwiches the composite sheet 120 with the first upper pressing roll 611.
- the first lower pressing roll 612 rotates in the delivery direction for feeding the composite sheet 120 around the axis while being in contact with the lower surface of the composite sheet 120.
- the center line CL side of the composite sheet 120 is positioned closer to the machine direction MD. That is, the first upper pressing roll 611 and the first lower pressing roll 612 are inclined with respect to the intersecting direction CD in the plan view of the composite sheet 120. Accordingly, the first upper pressing roll 611 and the first lower pressing roll 612 can widen the composite sheet 120 until it becomes flat.
- the second expansion roll mechanism 620 sandwiches the other side portion 120E2 of the composite sheet 120.
- the second expansion roll mechanism 620 includes a second upper pressing roll 621 and a second lower pressing roll 622.
- the configuration of the second expansion roll mechanism 620 is the same as that of the first expansion roll mechanism 610. Therefore, the description of the second expansion roll mechanism 620 is omitted.
- the degree of widening of the composite sheet 120 can be changed by appropriately changing the inclination angle with respect to.
- Tables 1 to 3 show data on the conditions of each sheet, adhesive, and stretching device used in the comparative evaluation. Moreover, the adhesive material used by comparative evaluation was manufactured with the following method.
- a part of a stabilizer such as a plasticizer and an adhesion-imparting agent (for example, tackifier) is put into a container having an internal temperature of 140 to 160 degrees.
- a base polymer such as SBSS (Styrene-Butadiene-Styrene) is put into the container and mixed by stirring under reduced pressure.
- the remaining stabilizer such as a plasticizer and a tackifier is put into the container and mixed by stirring under reduced pressure.
- the mixed adhesive is taken out and packed.
- the composition of the adhesive thus manufactured is as shown in Table 1.
- the composite sheet 120 stretched by each stretching apparatus has a probability of occurrence of holes (pin holes) (perforated holes). Rate) was measured respectively.
- the stretching apparatuses according to Examples 1 to 8 had a lower perforation rate than the stretching apparatuses according to Comparative Examples 1 to 10. That is, the stretching apparatus according to Examples 1 to 8 heats the composite sheet 120 at a temperature higher than the softening point (about 82 ° C.) of the adhesive and lower than the softening temperature of the composite sheet 120 (about 120 ° C.). ing. In the stretching apparatuses according to Examples 1 to 8, the plurality of convex portions are heated to a temperature higher than 40 degrees and lower than the softening point of the adhesive (about 82 ° C.). Therefore, it can be seen that the stretching apparatuses according to Examples 1 to 8 have a low perforation rate.
- the composite sheet 120 is heated before being pressed. At this time, the composite sheet 120 is heated to a temperature higher than the softening point of the adhesive and lower than the lowest softening temperature (for example, the back film 20A) among the softening temperatures of the plurality of sheets. According to this, before the composite sheet 120 is pressed by the embossing roll mechanism 520, the adhesive between the plurality of sheets can be softened.
- the adhesive between the plurality of sheets cannot be softened.
- the composite sheet 120 is heated at a temperature higher than the lowest softening temperature (for example, the back film 20A) among the softening temperatures of the plurality of sheets (the back film 20A and the back nonwoven fabric 20B), the back film 20A is heat-melted. It may be worn and hardened, the texture may deteriorate, and a plurality of sheets may be torn.
- the heated composite sheet 120 is stretched in the width direction W by being pressed in the thickness direction T.
- the convex part 532 and the convex part 542 are heated to a temperature higher than 40 degrees and lower than the softening point of the adhesive.
- the composite sheet 120 is pressed in a state where the adhesive between the plurality of sheets is soft and the composite sheet 120 is warmed.
- the adhesive between a plurality of sheets becomes easy to become familiar with the convex portions 532 and the convex portions 542. Therefore, heat transfer to the composite sheet 120 is sufficient, and the occurrence of perforations (pinholes) can be reliably suppressed without causing unevenness in the weight of the composite sheet 120.
- the adhesive material between the composite sheets 120 that has become soft oozes out between the plurality of sheets when passing through the embossing roll mechanism 520, and the convex part Easy to adhere to the surface.
- Adhesive material adhering to the surface of the convex portion may adhere to the composite sheet 120, and manufacturing defects such as perforations due to the adhesive material adhering to the composite sheet 120 may occur.
- a plurality of sheets are stretched uniformly in the width direction W without damaging the composite sheet 120 bonded with the adhesive. it can.
- the composite sheet 120 is heated to a temperature of at least 20 degrees or less than the lowest softening temperature among the softening temperatures of the plurality of sheets.
- a part of the composite sheet 120 is heat-sealed and becomes too hard. May end up.
- the composite sheet 120 is joined by an adhesive applied in a spiral pattern.
- the adhesive material is sprayed onto the composite sheet 120 in a mist form, and is applied with a thin linear shape and a high density. For this reason, when the composite sheet 120 is stretched, the composite sheet 120 is less likely to be unevenly stretched, and perforations (pinholes) are further less likely to occur.
- the embodiment of the present invention can be modified as follows.
- the composite sheet 120 has been described as being used for the back sheet 20, but is not limited thereto, and may be a member (for example, a front sheet) configured by a plurality of sheets.
- you may be used for the member of various absorbent articles, such as a disposable diaper and a sanitary napkin.
- the shape of the convex part (the convex part 532 and the convex part 542) has been described as having a tapered shape (substantially triangular shape) in the cross section in the axial direction, the shape is not limited to this, It may be trapezoidal or arcuate.
- Back film 20A may be intermittently bonded to the nonwoven fabric sheet 120B.
- the manufacturing method of the absorbent article has been described as having the sheet bonding step S10 to the product cutting step S90, but is not limited to this, and at least the sheet heating step S20, the sheet stretching step S30, Needless to say, the absorber bonding step S50 can be set as appropriate according to the purpose.
- a method for manufacturing an absorbent article that can be uniformly stretched in the width direction without damaging a composite sheet in which a plurality of sheets are bonded together with an adhesive, and a method for manufacturing the absorbent article.
- the drawing apparatus used can be provided.
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- Engineering & Computer Science (AREA)
- Vascular Medicine (AREA)
- Epidemiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Disclosed is a method for producing an absorbent article, which comprises a sheet heating step (S20) in which a composite sheet (120) is heated with a heating roll (510), and a sheet stretching step (S30) in which the composite sheet (120) is stretched in the cross direction (CD) with a pair of embossing roll mechanisms (520). In the sheet heating step (S20), the composite sheet (120) is heated to a temperature that is higher than the softening point of an adhesive material but lower than the lowest softening temperature among the softening temperatures of the plurality of sheets. In the sheet stretching step (S30), a plurality of projections constituting the embossing roll mechanisms (520) are heated to a temperature higher than 40°C but lower than the softening point of the adhesive material.
Description
本発明は、複数のシートが接着材により貼り合わされた複合シートと、複合シートに貼り付けられる吸収体とを少なくとも備える吸収性物品の製造方法、及び、吸収性物品の製造方法に用いられる延伸装置に関する。
The present invention relates to a method for manufacturing an absorbent article comprising at least a composite sheet in which a plurality of sheets are bonded together with an adhesive, and an absorbent body attached to the composite sheet, and a stretching apparatus used in the method for manufacturing the absorbent article. About.
生理用ナプキンやおむつなどの吸収性物品は、液体を透過する液透過性の表面シートと、液体を透過しない液不透過性の裏面シートと、表面シートと裏面シートとの間に設けられる吸収体とを備える。裏面シートは、バックフィルムと、バックフィルムよりも外側に設けられるバック不織布とによって構成される。
Absorbent articles such as sanitary napkins and diapers include a liquid-permeable top sheet that allows liquid to pass through, a liquid-impermeable back sheet that does not pass liquid, and an absorber provided between the top sheet and the back sheet. With. The back sheet is composed of a back film and a back nonwoven fabric provided outside the back film.
裏面シートは非弾性体であり、そのまま用いると風合いがよくないため、柔軟性や風合いを高める処理が裏面シートに施されている。例えば、ギア延伸法が開示されている(特許文献1参照)。
The back sheet is an inelastic material, and when used as it is, the texture is not good. Therefore, the back sheet is subjected to a treatment for improving flexibility and texture. For example, a gear stretching method is disclosed (see Patent Document 1).
ギア延伸法は、互いに噛み合うギア歯を有する一対のロールの間に裏面シートを通過させて、裏面シートに厚み方向の凹凸を形成する方法である。これにより、裏面シートは、ギア歯に沿った形状に変形される。したがって、裏面シートが幅方向に延伸される。また、裏面シートは幅方向に延伸された結果、厚み方向には薄くなるため、裏面シートの剛性を低下させることができる。
The gear stretching method is a method in which a back sheet is passed between a pair of rolls having gear teeth meshing with each other to form unevenness in the thickness direction on the back sheet. Thereby, the back sheet is deformed into a shape along the gear teeth. Therefore, the back sheet is stretched in the width direction. Moreover, since the back sheet is thinned in the thickness direction as a result of being stretched in the width direction, the rigidity of the back sheet can be reduced.
ところが、バックフィルム及びバック不織布は、接着材により貼り合わされるため、接着材が塗布された部分と塗布されていない部分とでは、延伸度合が大きく異なる。これに対して、ギア歯を加熱することにより、裏面シートがギア歯に噛み込まれる際に裏面シートを温める方法が知られている。この方法によれば、接着材を柔らかくし、ギア歯の凹凸に馴染みやすくなり、接着材が塗布された部分の延伸度合と塗布されていない部分との延伸の度合との差を小さくできる。
However, since the back film and the back nonwoven fabric are bonded together with an adhesive, the degree of stretching is greatly different between a portion where the adhesive is applied and a portion where the adhesive is not applied. On the other hand, a method is known in which the back sheet is heated when the back sheet is bitten by the gear teeth by heating the gear teeth. According to this method, the adhesive material is softened, and it becomes easy to adapt to the unevenness of the gear teeth, so that the difference between the degree of stretching of the part where the adhesive is applied and the degree of stretching of the part where the adhesive is not applied can be reduced.
しかしながら、上述した従来のギア延伸法には、次のような問題があった。すなわち、ギア歯を有する一対のロールの間を裏面シートが通過する短い期間に、接着材を柔らかくしなければならず、ギア歯の温度を可能な限り高めるか、搬送速度を遅しなければならない。
However, the conventional gear stretching method described above has the following problems. That is, the adhesive must be softened for a short period of time when the back sheet passes between a pair of rolls having gear teeth, and the temperature of the gear teeth must be increased as much as possible or the conveying speed must be delayed.
ギア延伸法では、ギア歯が裏面シートを押し込むことによってバック不織布を低目付化しているため、熱伝達が不十分であれば、裏面シートに目付のムラが発生し、穴あき(ピンホール)が発生しやすくなる。また、ギア歯の温度を高くし過ぎると、バック不織布の繊維が熱融着されて硬くなり、風合いが悪化するという問題があった。
In the gear stretching method, the back nonwoven fabric is reduced in weight by the gear teeth pushing the back sheet, so if the heat transfer is insufficient, the back sheet will have uneven weight, and there will be holes (pinholes). It tends to occur. Moreover, when the temperature of the gear teeth is too high, there is a problem that the fibers of the back nonwoven fabric are thermally fused and hardened, and the texture is deteriorated.
第1の特徴に係る製造方法は、複数のシート(例えば、バックフィルム20A及びバック不織布20B)が接着材により貼り合わされた複合シート(裏面シート20)と、前記複合シートに貼り付けられる吸収体(吸収体30)とを少なくとも備える吸収性物品の製造方法である。吸収性物品の製造方法は、前記複合シートの搬送方向(機械方向MD)に沿って回転する加熱ロール(加熱ロール510)によって、前記搬送方向に沿って搬送される前記複合シートを加熱する工程A(シート加熱工程S20)と、外周に複数の凸部(凸部532及び凸部542)が形成され、前記複合シートを挟んで一方の前記凸部の間に他方の前記凸部が嵌合する一対の型押ロール機構(型押ロール機構520)によって、前記複合シートを前記搬送方向に直交する交差方向(交差方向CD)に延伸する工程B(シート延伸工程S30)とを有し、前記工程Aでは、前記複合シートは、前記接着材の軟化点よりも高く、かつ前記複数のシートの軟化温度のうち最も低い軟化温度よりも低い温度になるまで加熱され、前記工程Bでは、前記複数の凸部は、40度よりも高く、かつ前記接着材の軟化点よりも低い温度に加熱される。
The manufacturing method according to the first feature includes a composite sheet (back sheet 20) in which a plurality of sheets (for example, the back film 20A and the back nonwoven fabric 20B) are bonded together with an adhesive, and an absorbent body that is bonded to the composite sheet ( An absorbent article comprising at least an absorber 30). The manufacturing method of an absorbent article is a process A in which the composite sheet conveyed along the conveyance direction is heated by a heating roll (heating roll 510) rotating along the conveyance direction (machine direction MD) of the composite sheet. (Sheet heating step S20) and a plurality of convex portions (convex portions 532 and convex portions 542) are formed on the outer periphery, and the other convex portion is fitted between one convex portion with the composite sheet interposed therebetween. A step B (sheet stretching step S30) of stretching the composite sheet in a crossing direction (crossing direction CD) orthogonal to the transport direction by a pair of stamping roll mechanisms (embossing roll mechanism 520); In A, the composite sheet is heated to a temperature higher than the softening point of the adhesive and lower than the lowest softening temperature among the softening temperatures of the plurality of sheets. In the step B, Protrusion of the number is higher than 40 degrees, and is heated to a temperature lower than the softening point of the adhesive.
以下において、本実施形態に係る吸収性物品の製造方法及び延伸装置について、図面を参照しながら説明する。なお、以下の図面の記載において、同一または類似の部分には、同一または類似の符号を付している。ただし、図面は模式的なものであり、各寸法の比率などは現実のものとは異なることに留意すべきである。
Hereinafter, a method for manufacturing an absorbent article and a stretching apparatus according to the present embodiment will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.
したがって、具体的な寸法などは以下の説明を参酌して判断すべきものである。また、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれていることは勿論である。
Therefore, specific dimensions should be determined in consideration of the following explanation. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.
まず、本実施形態に係る吸収性物品の製造方法によって製造される吸収性物品1の構成について、図面を参照しながら説明する。図1は、本実施形態に係る吸収性物品1を示す平面図である。図2は、本実施形態に係る吸収性物品1を示す断面図(図1のA-A断面図)である。図3は、本実施形態に係る吸収性物品1を示す断面図(図1のB-B断面図)である。なお、本実施形態では、吸収性物品1は、オープン型のおむつである。
First, the structure of the absorbent article 1 manufactured by the method for manufacturing an absorbent article according to the present embodiment will be described with reference to the drawings. FIG. 1 is a plan view showing an absorbent article 1 according to this embodiment. FIG. 2 is a cross-sectional view (AA cross-sectional view of FIG. 1) showing the absorbent article 1 according to the present embodiment. FIG. 3 is a cross-sectional view (BB cross-sectional view of FIG. 1) showing the absorbent article 1 according to the present embodiment. In the present embodiment, the absorbent article 1 is an open diaper.
図1~3に示すように、吸収性物品1は、着用者の前胴回り(お腹側)から後胴回り(背中側)に向かう方向(以下、長手方向L)に向かって縦長の形状を有する。
As shown in FIGS. 1 to 3, the absorbent article 1 has a vertically long shape in a direction (hereinafter, referred to as a longitudinal direction L) from the wearer's front waistline (belly side) to the back waistline (back side).
吸収性物品1は、長手方向Lにおいて、着用者の前胴回りに対応する前胴回り領域S1と、着用者の後胴回りに対応する後胴回り領域S2と、着用者の股下に対応し、前胴回り領域S1と後胴回り領域S2との間に位置する股下領域S3とを有する。
In the longitudinal direction L, the absorbent article 1 corresponds to the front waistline region S1 corresponding to the wearer's front waistline, the rear waistline region S2 corresponding to the wearer's back waistline, the wearer's inseam, and the front waistline region. There is a crotch region S3 located between S1 and the rear waistline region S2.
また、吸収性物品1は、長手方向Lに直交する幅方向Wにおいて、後述する吸収体30を含む中央領域C1と、幅方向Wに対して中央領域C1の外側に位置する一対の側部領域C2とを有する。
In addition, the absorbent article 1 has a center region C1 including an absorber 30 described later in the width direction W orthogonal to the longitudinal direction L, and a pair of side regions located outside the center region C1 with respect to the width direction W. C2.
このような吸収性物品1は、表面シート10と、裏面シート20と、吸収体30とを備える。また、吸収性物品1には、ウエストフラップ部40と、サイドフラップ部50とが設けられる。
Such an absorbent article 1 includes a top sheet 10, a back sheet 20, and an absorber 30. Further, the absorbent article 1 is provided with a waist flap portion 40 and a side flap portion 50.
表面シート10は、着用者の肌に接する側に設けられる。表面シート10は、吸収体30を包み込むように配設される。表面シート10は、親水性不織布や織物、開口プラスチックフィルム、開口疎水性不織布などの液透過性のシートによって形成される。
The top sheet 10 is provided on the side in contact with the wearer's skin. The top sheet 10 is disposed so as to wrap the absorber 30. The top sheet 10 is formed of a liquid-permeable sheet such as a hydrophilic nonwoven fabric or woven fabric, an apertured plastic film, or an apertured hydrophobic nonwoven fabric.
裏面シート20は、着用時において吸収性物品1の外側に設けられる。裏面シート20は、液体を透過しない液不透過性(例えば、ポリエチレン)のシート状のバックフィルム20Aと、バックフィルムよりも外側に設けられるシート状のバック不織布20Bとによって形成される。裏面シート20は、複数のシートが接着材により貼り合わされた複合シートを構成する。なお、裏面シート20の詳細については、後述する。
The back sheet 20 is provided outside the absorbent article 1 when worn. The back sheet 20 is formed of a liquid-impermeable (eg, polyethylene) sheet-like back film 20A that does not transmit liquid, and a sheet-like back nonwoven fabric 20B provided outside the back film. The back sheet 20 constitutes a composite sheet in which a plurality of sheets are bonded together with an adhesive. Details of the back sheet 20 will be described later.
吸収体30は、表面シート10と裏面シート20との間に設けられる。吸収体30は、着用者の体液を吸収する。吸収体30は、粉砕パルプや高吸収性ポリマーなどの混合粉体30Aと、混合粉体30Aを被覆するティッシュ等の被覆材30Bとによって形成される。
The absorber 30 is provided between the top sheet 10 and the back sheet 20. The absorber 30 absorbs the body fluid of the wearer. The absorber 30 is formed of a mixed powder 30A such as pulverized pulp or a superabsorbent polymer, and a covering material 30B such as a tissue that covers the mixed powder 30A.
ウエストフラップ部40は、長手方向Lに対する前胴回り領域S1及び後胴回り領域S2に設けられる。ウエストフラップ部40は、前胴回り領域S1に位置する一対の前側フラップ部40Aと、後胴回り領域S2に位置する一対の後側フラップ部40Bとを有する。
The waist flap portion 40 is provided in the front waistline region S1 and the back waistline region S2 with respect to the longitudinal direction L. The waist flap portion 40 has a pair of front flap portions 40A located in the front waistline region S1 and a pair of rear flap portions 40B located in the rear waistline region S2.
前側フラップ部40Aは、幅方向W外側に向かって、裏面シート20に貼り付けられるサイドシート60が延出することによって形成される。なお、前側フラップ部40Aは、サイドシート60の代わりに、バック不織布20Bが延出することによって形成されてもよい。
40 A of front side flap parts are formed when the side sheet | seat 60 affixed on the back surface sheet 20 extends toward the width direction W outer side. In addition, 40 A of front side flap parts may be formed when the back nonwoven fabric 20B extends instead of the side sheet 60. FIG.
後側フラップ部40Bは、前側フラップ部40Aと同様に、幅方向W外側に向かって、サイドシート60が延出することによって形成される。なお、後側フラップ部40Bは、前側フラップ部40Aと同様に、サイドシート60の代わりに、バック不織布20Bが延出することによって形成されてもよい。後側フラップ部40Bにおける吸収体30が設けられる側の面には、前胴回り領域S1に係止する係止部41が設けられる。
The rear side flap part 40B is formed by extending the side seat 60 toward the outer side in the width direction W similarly to the front side flap part 40A. In addition, the back side flap part 40B may be formed by extending the back nonwoven fabric 20B instead of the side sheet 60 similarly to the front side flap part 40A. A locking portion 41 that locks to the front waistline region S1 is provided on the surface of the rear flap portion 40B on the side where the absorber 30 is provided.
係止部41は、例えば、面ファスナーによって形成される。この場合、係止部41が雄部材となり、前胴回り領域S1の係止部41が係止される領域に被係止部として雌部材が設けられる。なお、前胴回り領域S1が不織布によって構成されていれば、前胴回り領域S1自体が被係止部の役割を果たしてもよい。
The locking portion 41 is formed by, for example, a hook-and-loop fastener. In this case, the locking portion 41 is a male member, and a female member is provided as a locked portion in a region where the locking portion 41 of the front waistline region S1 is locked. In addition, as long as front waistline area | region S1 is comprised with the nonwoven fabric, front waistline area | region S1 itself may fulfill | perform the role of a to-be-latched part.
サイドフラップ部50は、吸収体30よりも幅方向W外側において長手方向Lに沿って設けられる。サイドフラップ部50には、長手方向Lに伸縮性を有するゴム(例えば、ポリウレタン)からなる紐状体51が設けられる。紐状体51は、長手方向Lに伸張した状態で、裏面シート20に接合される。なお、紐状体51は、幅方向W内側から外側に向けて、第1紐状体51A、第2紐状体51B、第3紐状体51C及び第4紐状体51Dによって構成される。
The side flap part 50 is provided along the longitudinal direction L outside the absorbent body 30 in the width direction W outside. The side flap portion 50 is provided with a string-like body 51 made of rubber (for example, polyurethane) having elasticity in the longitudinal direction L. The string-like body 51 is joined to the back sheet 20 in a state of being stretched in the longitudinal direction L. The string-like body 51 includes a first string-like body 51A, a second string-like body 51B, a third string-like body 51C, and a fourth string-like body 51D from the inner side to the outer side in the width direction W.
次に、上述した裏面シート20の構成について、図面を参照しながら説明する。図4(a)は、本実施形態に係る裏面シート20を示す平面図である。図4(b)は、本実施形態に係る裏面シート20を示す拡大断面図(図4(a)のA-A断面図)である。
Next, the configuration of the back sheet 20 described above will be described with reference to the drawings. Fig.4 (a) is a top view which shows the back surface sheet 20 which concerns on this embodiment. FIG. 4B is an enlarged cross-sectional view (AA cross-sectional view of FIG. 4A) showing the back sheet 20 according to the present embodiment.
図4(a)に示すように、裏面シート20は、延伸部21と、未延伸部22とを有する。延伸部21は、裏面シート20の厚さ方向Tに裏面シート20が押圧されることによって形成されている。つまり、延伸部21は、延伸加工が施されることによって未延伸部22よりも坪量(単位面積当たりの質量)が少ない領域である。
As shown in FIG. 4A, the back sheet 20 has a stretched portion 21 and an unstretched portion 22. The extending portion 21 is formed by pressing the back sheet 20 in the thickness direction T of the back sheet 20. That is, the stretched portion 21 is a region having a smaller basis weight (mass per unit area) than that of the unstretched portion 22 by being subjected to stretching.
延伸部21は、図4(b)に示すように、延伸量が大きい粗部21Lと、拡張量が粗部21Lよりも小さい密部21Tとが交互に配置されることによって形成される。なお、粗部21L及び密部21Tは、長手方向Lに連続し、かつ幅方向Wに複数並んだ状態で配設される。
As shown in FIG. 4B, the stretched portion 21 is formed by alternately arranging a rough portion 21L having a large stretch amount and a dense portion 21T having an expansion amount smaller than the coarse portion 21L. The coarse portion 21L and the dense portion 21T are arranged in a state of being continuous in the longitudinal direction L and being arranged in the width direction W.
延伸部21は、中央領域C1に位置する中央延伸部分21Aと、側部領域C2の一部に位置する端部延伸部分21Bとを有する。なお、本実施形態では、側部領域C2の一部とは、幅方向W外側に位置する縁部分20Eを含む縁部領域C3を除いた股下領域S3を示す。
The extending portion 21 has a central extending portion 21A located in the central region C1 and an end extending portion 21B located in a part of the side region C2. In the present embodiment, the part of the side region C2 indicates the crotch region S3 excluding the edge region C3 including the edge portion 20E located on the outer side in the width direction W.
ここで、端部延伸部分21Bは、必ずしも側部領域C2の一部に設けられる必要はなく、側部領域C2全域に設けられていてもよく、図5に示すように、股下領域S3に設けられていなくてもよい。また、中央延伸部分21Aは、必ずしも中央領域C1の全域に設けられる必要はなく、中央領域C1の少なくとも一部に設けられていればよく、例えば、図5に示すように、長手方向L外側に位置する縁部分20Eを含む縁部領域C4を除いた中央領域C1に設けられていてもよい。
Here, the end extension portion 21B is not necessarily provided in a part of the side region C2, and may be provided in the entire side region C2, and is provided in the crotch region S3 as shown in FIG. It does not have to be done. Further, the central extension portion 21A does not necessarily have to be provided in the entire region of the central region C1, and may be provided in at least a part of the central region C1, for example, on the outer side in the longitudinal direction L as shown in FIG. You may provide in the center area | region C1 except the edge part area | region C4 containing the edge part 20E located.
このような延伸部21は、裏面シート20に延伸加工が施される前の裏面シート20に対して3.0倍以下で拡張されることが好ましい。また、延伸部21は、幅方向Wに拡幅されて平坦になった状態で吸収体30と接合される(図6参照)。
Such a stretched portion 21 is preferably expanded by 3.0 times or less with respect to the back sheet 20 before the back sheet 20 is stretched. Moreover, the extending | stretching part 21 is joined to the absorber 30 in the state expanded and flattened in the width direction W (refer FIG. 6).
未延伸部22では、裏面シート20が厚さ方向Tに押圧されていない。つまり、未延伸部22は、裏面シート20において延伸部21を除いた領域である。未延伸部22は、一対の側部領域C2に設けられる。
In the unstretched portion 22, the back sheet 20 is not pressed in the thickness direction T. That is, the unstretched portion 22 is a region excluding the stretched portion 21 in the back sheet 20. The unstretched portion 22 is provided in the pair of side regions C2.
次に、上述した吸収性物品1を製造する吸収性物品の製造方法について、図面を参照しながら説明する。図6は、本実施形態に係る吸収性物品の製造方法を説明するための図である。
Next, a method for manufacturing an absorbent article for manufacturing the above-described absorbent article 1 will be described with reference to the drawings. FIG. 6 is a diagram for explaining a method for manufacturing an absorbent article according to the present embodiment.
図6に示すように、吸収性物品の製造方法は、裏面シート20と吸収体30とを少なくとも備える吸収性物品1を製造する。吸収性物品の製造方法は、シート貼合工程S10と、シート加熱工程S20と、シート延伸工程S30と、シート拡幅工程S40と、吸収体接合工程S50と、紐状体配置工程S60と、サイドフラップ形成工程S70と、ウエストフラップ配置工程S80と、製品切断工程S90とを備える。
As shown in FIG. 6, the manufacturing method of an absorbent article manufactures the absorbent article 1 provided with the back sheet 20 and the absorber 30 at least. The manufacturing method of the absorbent article includes a sheet bonding step S10, a sheet heating step S20, a sheet stretching step S30, a sheet widening step S40, an absorbent body joining step S50, a string-like body arranging step S60, and a side flap. It includes a forming step S70, a waist flap arranging step S80, and a product cutting step S90.
シート貼合工程S10では、接着材(例えば、ホットメルト)を用いて、バックフィルム20Aが連続したバックシート120Aと、バック不織布20Bが連続した不織布シート120Bとを搬送方向(以下、機械方向MD)に沿って搬送しながら互いに貼り合わせ、複合シート120を形成する。
In the sheet bonding step S10, an adhesive (for example, hot melt) is used to convey the back sheet 120A in which the back film 20A is continuous and the nonwoven sheet 120B in which the back nonwoven fabric 20B is continuous (hereinafter, machine direction MD). The composite sheet 120 is formed by bonding together while being conveyed.
シート加熱工程S20では、後述する加熱ロール510によって、複合シート120を加熱する。このとき、複合シート120は、接着材の軟化点よりも高く、かつ複数のシートの軟化温度のうち最も低い軟化温度(例えば、バックフィルム20A)よりも低い温度になるまで加熱される。特に、複合シート120は、複数のシートの軟化温度のうち最も低い軟化温度よりも少なくとも20度以下の温度に加熱される。
In the sheet heating step S20, the composite sheet 120 is heated by a heating roll 510 described later. At this time, the composite sheet 120 is heated to a temperature higher than the softening point of the adhesive and lower than the lowest softening temperature (for example, the back film 20A) among the softening temperatures of the plurality of sheets. In particular, the composite sheet 120 is heated to a temperature of at least 20 degrees below the lowest softening temperature of the plurality of sheets.
シート延伸工程S30では、加熱された複合シート120を、後述する型押ロール機構520によって複合シート120の厚さ方向Tに押圧する。これにより、複合シート120の幅方向W(すなわち、機械方向MDに直交する交差方向CD)に複合シート120が延伸され、複合シート120に延伸部21及び未延伸部22が形成される。このとき、後述する型押ロール機構520の凸部(凸部532及び凸部542)は、40度よりも高く、かつ接着材の軟化点よりも低い温度に加熱されている。
In the sheet stretching step S30, the heated composite sheet 120 is pressed in the thickness direction T of the composite sheet 120 by a stamping roll mechanism 520 described later. Thereby, the composite sheet 120 is stretched in the width direction W of the composite sheet 120 (that is, the cross direction CD orthogonal to the machine direction MD), and the stretched portion 21 and the unstretched portion 22 are formed in the composite sheet 120. At this time, the convex part (the convex part 532 and the convex part 542) of the embossing roll mechanism 520 described later is heated to a temperature higher than 40 degrees and lower than the softening point of the adhesive.
シート拡幅工程S40では、延伸された複合シート120を、後述する拡幅ロール機構600によって、複合シート120の幅方向W外側に向けて平坦状になるまで拡幅(拡張)する。
In the sheet widening step S40, the stretched composite sheet 120 is widened (expanded) by the widening roll mechanism 600 described later until the composite sheet 120 becomes flat toward the outside in the width direction W of the composite sheet 120.
吸収体接合工程S50では、表面シート10が接合された吸収体30を、拡幅された複合シート120上に接合(載置)する。
In the absorber bonding step S50, the absorber 30 to which the top sheet 10 is bonded is bonded (placed) on the widened composite sheet 120.
紐状体配置工程S60では、複合シート120の機械方向MDに対して紐状体51を伸張させた状態で、当該紐状体51を吸収体30の幅方向W外側に対応する複合シート120上に配置する。
In the string-like body arranging step S60, the string-like body 51 is placed on the composite sheet 120 corresponding to the outer side in the width direction W of the absorbent body 30 with the string-like body 51 extended with respect to the machine direction MD of the composite sheet 120. To place.
サイドフラップ形成工程S70では、バックシート120Aよりも幅方向Wに延出した不織布シート120Bを幅方向W内側に折り返すことによって、当該不織布シート120Bで紐状体51を包み、サイドフラップ部50を形成する。
In the side flap forming step S70, the nonwoven fabric sheet 120B extending in the width direction W with respect to the back sheet 120A is folded back inward in the width direction W, thereby wrapping the string-like body 51 with the nonwoven fabric sheet 120B and forming the side flap portion 50. To do.
ウエストフラップ配置工程S80では、予め形成された前側フラップ部40Aと、係止部41が取り付けられた後側フラップ部40Bとを複合シート120に接合する。
In the waist flap arrangement step S80, the front flap portion 40A formed in advance and the rear flap portion 40B to which the locking portion 41 is attached are joined to the composite sheet 120.
製品切断工程S90では、吸収体30、サイドフラップ部50及びウエストフラップ部40が設けられた複合シート120を幅方向Wに沿って一製品の大きさに切断し、吸収性物品1を製造する。
In product cutting process S90, the composite sheet 120 provided with the absorber 30, the side flap part 50, and the waist flap part 40 is cut | disconnected to the magnitude | size of one product along the width direction W, and the absorbent article 1 is manufactured.
次に、上述したシート加熱工程S20及びシート延伸工程S30で使用される延伸装置500の構成について、図面を参照しながら説明する。図7(a)は、本実施形態に係る延伸装置500の一部を示す拡大斜視図である。図7(b)は、本実施形態に係る型押ロール機構520の軸方向断面図である。
Next, the configuration of the stretching apparatus 500 used in the above-described sheet heating step S20 and sheet stretching step S30 will be described with reference to the drawings. FIG. 7A is an enlarged perspective view showing a part of the stretching apparatus 500 according to the present embodiment. FIG. 7B is an axial sectional view of the embossing roll mechanism 520 according to the present embodiment.
図7(a)に示すように、延伸装置500は、バックシート120Aと不織布シート120Bとが貼り合わされた複合シート120を、機械方向MDに沿って搬送しながら交差方向CDに延伸する。なお、本実施形態では、複合シート120は、スパイラルパターンで塗布された接着材により接合される。延伸装置500は、加熱ロール510と、型押ロール機構520とを備える。
As shown in FIG. 7A, the stretching device 500 stretches the composite sheet 120 in which the back sheet 120A and the nonwoven fabric sheet 120B are bonded together in the cross direction CD while being conveyed along the machine direction MD. In the present embodiment, the composite sheet 120 is joined by an adhesive applied in a spiral pattern. The stretching apparatus 500 includes a heating roll 510 and an embossing roll mechanism 520.
加熱ロール510は、型押ロール機構520よりも機械方向MDの上流側に設けられる。加熱ロール510は、機械方向MDに沿って回転しながら、複合シート120が型押ロール機構520を通過する前に複合シート120を加熱する。
The heating roll 510 is provided on the upstream side in the machine direction MD from the embossing roll mechanism 520. The heating roll 510 heats the composite sheet 120 before passing through the embossing roll mechanism 520 while rotating along the machine direction MD.
加熱ロール510は、所定の温度に設定される。具体的には、加熱ロール510は、複合シート120を接着材の軟化点よりも高く、かつ複数のシートの軟化温度(いわゆる、融点)のうち最も低い軟化温度(例えば、バックフィルム20A)よりも低い温度に加熱する第1加熱部(不図示)を有する。
The heating roll 510 is set to a predetermined temperature. Specifically, the heating roll 510 has the composite sheet 120 higher than the softening point of the adhesive and lower than the lowest softening temperature (for example, the back film 20A) among the softening temperatures (so-called melting points) of the plurality of sheets. It has the 1st heating part (not shown) heated to low temperature.
型押ロール機構520は、加熱ロール510を通過した複合シート120を加熱するとともに、複合シート120の厚さ方向Tに複合シート120を押圧する。型押ロール機構520は、所定の温度に設定される。具体的には、型押ロール機構520は、後述する複数の凸部(凸部532及び凸部542)を40度よりも高く、かつ接着材の軟化点よりも低い温度に加熱する第2加熱部(不図示)を有する。
The embossing roll mechanism 520 heats the composite sheet 120 that has passed through the heating roll 510 and presses the composite sheet 120 in the thickness direction T of the composite sheet 120. The embossing roll mechanism 520 is set to a predetermined temperature. Specifically, the embossing roll mechanism 520 is a second heating that heats a plurality of convex portions (the convex portions 532 and the convex portions 542) described later to a temperature higher than 40 degrees and lower than the softening point of the adhesive. Part (not shown).
このような型押ロール機構520は、図7(b)に示すように、外周に複数の凸部(いわゆる、延伸刃)が形成され、複合シート120を挟んで一方の凸部532の間に他方の凸部542が嵌合する一対のロール機構によって構成される。
As shown in FIG. 7B, such an embossing roll mechanism 520 has a plurality of convex portions (so-called stretched blades) formed on the outer periphery, and sandwiches the composite sheet 120 between one convex portion 532. The other convex part 542 is comprised by a pair of roll mechanism which fits.
凸部532及び凸部542の形状は、ロール機構の軸芯方向における断面において、ロール機構の外周から外側に向けて先細状である。本実施形態では、凸部532及び凸部542の形状は、ロール機構の軸芯方向における断面において、略三角形状である。
The shapes of the convex portion 532 and the convex portion 542 are tapered from the outer periphery to the outer side of the roll mechanism in the cross section in the axial direction of the roll mechanism. In this embodiment, the shape of the convex part 532 and the convex part 542 is a substantially triangular shape in the cross section in the axial direction of a roll mechanism.
凸部532及び凸部542には、フェライト系ステンレス(SUS430 2B)が使用される。例えば、凸部532の厚みt1及び凸部542の厚みt2は、それぞれ0.7~1.0mmである。また、凸部532及び凸部542の外表面には、研磨加工が施されることが好ましい。
Ferritic stainless steel (SUS430 2B) is used for the convex portions 532 and the convex portions 542. For example, the thickness t1 of the convex portion 532 and the thickness t2 of the convex portion 542 are 0.7 to 1.0 mm, respectively. Moreover, it is preferable that the outer surface of the convex part 532 and the convex part 542 is polished.
このような延伸装置500では、例えば、加熱ロール510の温度が100度である。型押ロール機構520の温度が60度である。凸部532と凸部542とが嵌合した際のロール機構の軸芯方向に直交する方向に沿った長さ(L)が1.6mmである。複数の凸部532の間隔(p1)及び複数の凸部542の間隔(p2)が2.5mmである。この条件によって、延伸装置500は、複合シート120に延伸加工を施す前の複合シート120に対して1.3倍の延伸加工を施すことができる。
In such a stretching apparatus 500, for example, the temperature of the heating roll 510 is 100 degrees. The temperature of the embossing roll mechanism 520 is 60 degrees. The length (L) along the direction orthogonal to the axial direction of the roll mechanism when the convex portion 532 and the convex portion 542 are fitted is 1.6 mm. The interval (p1) between the plurality of projections 532 and the interval (p2) between the plurality of projections 542 are 2.5 mm. Under these conditions, the stretching apparatus 500 can perform a 1.3-fold stretching process on the composite sheet 120 before the composite sheet 120 is stretched.
なお、延伸装置500では、上述した諸条件を適宜変更することによって、複合シート120が幅方向Wに延伸する倍率(延伸倍率)を変更できる。また、複合シート120の中央領域C1と側部領域C2とに対応する凸部532や凸部542の高さが異なっていてもよい。これにより、中央領域C1での延伸倍率と、側部領域C2での延伸倍率とを変更できる。
In the stretching apparatus 500, the magnification (stretching ratio) at which the composite sheet 120 is stretched in the width direction W can be changed by appropriately changing the above-described various conditions. Moreover, the height of the convex part 532 and the convex part 542 corresponding to the center area | region C1 and the side part area | region C2 of the composite sheet 120 may differ. Thereby, the draw ratio in the center area | region C1 and the draw ratio in the side part area | region C2 can be changed.
次に、上述したシート拡幅工程S40で使用される拡幅ロール機構600の構成について、図面を参照しながら説明する。図8は、本実施形態に係る拡幅ロール機構600を示す斜視図である。
Next, the configuration of the widening roll mechanism 600 used in the above-described sheet widening step S40 will be described with reference to the drawings. FIG. 8 is a perspective view showing the widening roll mechanism 600 according to the present embodiment.
図8に示すように、拡幅ロール機構600は、型押ロール機構520により延伸された複合シート120を、複合シート120の交差方向CD外側に向けて平坦状になるまで拡幅する。この結果、複合シート120に設けられた延伸部21(粗部21L及び密部21T)が平らになり、延伸部21が拡幅する。拡幅ロール機構600は、第1拡張ロール機構610と、第2拡張ロール機構620とを備える。
As shown in FIG. 8, the widening roll mechanism 600 widens the composite sheet 120 stretched by the embossing roll mechanism 520 toward the outside in the cross direction CD of the composite sheet 120 until it becomes flat. As a result, the extending portion 21 (the rough portion 21L and the dense portion 21T) provided in the composite sheet 120 becomes flat, and the extending portion 21 widens. The widening roll mechanism 600 includes a first expansion roll mechanism 610 and a second expansion roll mechanism 620.
第1拡張ロール機構610は、複合シート120の一方の側部120E1を挟持する。第1拡張ロール機構610は、第1上側押圧ロール611と、第1下側押圧ロール612とを備える。
The first expansion roll mechanism 610 sandwiches one side portion 120E1 of the composite sheet 120. The first expansion roll mechanism 610 includes a first upper pressing roll 611 and a first lower pressing roll 612.
第1上側押圧ロール611は、複合シート120の一面側(上面側)に配設される。第1上側押圧ロール611は、複合シート120の上面に接した状態で、軸芯を中心に複合シート120を送り出す送出方向に沿って回転する。
The first upper pressing roll 611 is disposed on one surface side (upper surface side) of the composite sheet 120. The first upper pressing roll 611 rotates along the feeding direction of feeding the composite sheet 120 around the axis while being in contact with the upper surface of the composite sheet 120.
第1下側押圧ロール612は、複合シート120を挟んで、第1上側押圧ロール611の反対側(下面側)に配設される。第1下側押圧ロール612は、第1上側押圧ロール611との間で複合シート120を挟持する。第1下側押圧ロール612は、複合シート120の下面に接した状態で、軸芯を中心に複合シート120を送り出す送出方向に沿って回転する。
The first lower pressing roll 612 is disposed on the opposite side (lower surface side) of the first upper pressing roll 611 with the composite sheet 120 interposed therebetween. The first lower pressing roll 612 sandwiches the composite sheet 120 with the first upper pressing roll 611. The first lower pressing roll 612 rotates in the delivery direction for feeding the composite sheet 120 around the axis while being in contact with the lower surface of the composite sheet 120.
第1上側押圧ロール611及び第1下側押圧ロール612では、複合シート120の中心線CL側が機械方向MDの先寄りに位置する。すなわち、第1上側押圧ロール611及び第1下側押圧ロール612は、複合シート120の平面視において、交差方向CDに対して傾斜している。これにより、第1上側押圧ロール611及び第1下側押圧ロール612は、複合シート120を平坦状になるまで拡幅できる。
In the first upper pressing roll 611 and the first lower pressing roll 612, the center line CL side of the composite sheet 120 is positioned closer to the machine direction MD. That is, the first upper pressing roll 611 and the first lower pressing roll 612 are inclined with respect to the intersecting direction CD in the plan view of the composite sheet 120. Accordingly, the first upper pressing roll 611 and the first lower pressing roll 612 can widen the composite sheet 120 until it becomes flat.
第2拡張ロール機構620は、複合シート120の他方の側部120E2を挟持する。第2拡張ロール機構620は、第2上側押圧ロール621と、第2下側押圧ロール622とを備える。なお、第2拡張ロール機構620の構成は、第1拡張ロール機構610と同様である。従って、第2拡張ロール機構620の説明については省略する。
The second expansion roll mechanism 620 sandwiches the other side portion 120E2 of the composite sheet 120. The second expansion roll mechanism 620 includes a second upper pressing roll 621 and a second lower pressing roll 622. The configuration of the second expansion roll mechanism 620 is the same as that of the first expansion roll mechanism 610. Therefore, the description of the second expansion roll mechanism 620 is omitted.
このような拡幅ロール機構600では、第1上側押圧ロール611及び第1下側押圧ロール612の交差方向CDに対する傾斜角や、第2上側押圧ロール621及び第2下側押圧ロール622の交差方向CDに対する傾斜角を適宜変更することによって、複合シート120の拡幅度合いを変更できる。
In such a widening roll mechanism 600, the angle of inclination of the first upper pressing roll 611 and the first lower pressing roll 612 with respect to the intersecting direction CD, or the intersecting direction CD of the second upper pressing roll 621 and the second lower pressing roll 622. The degree of widening of the composite sheet 120 can be changed by appropriately changing the inclination angle with respect to.
(比較評価)
次に、本発明の効果を更に明確にするために、以下の比較例及び実施例に係る延伸装置を用いて行った比較評価について説明する。なお、本発明はこれらの例によって何ら限定されるものではない。 (Comparison evaluation)
Next, in order to further clarify the effects of the present invention, a comparative evaluation performed using a stretching apparatus according to the following comparative examples and examples will be described. In addition, this invention is not limited at all by these examples.
次に、本発明の効果を更に明確にするために、以下の比較例及び実施例に係る延伸装置を用いて行った比較評価について説明する。なお、本発明はこれらの例によって何ら限定されるものではない。 (Comparison evaluation)
Next, in order to further clarify the effects of the present invention, a comparative evaluation performed using a stretching apparatus according to the following comparative examples and examples will be described. In addition, this invention is not limited at all by these examples.
比較評価で使用する各シートや接着材、各延伸装置の条件に関するデータは、表1~表3に示す通りである。また、比較評価で使用した接着材は、以下の方法により製造された。
Tables 1 to 3 show data on the conditions of each sheet, adhesive, and stretching device used in the comparative evaluation. Moreover, the adhesive material used by comparative evaluation was manufactured with the following method.
まず、内温140~160度の容器内に、可塑剤・接着付与剤(例えば、タッキファイヤー)などの安定剤の一部を投入する。次いで、容器内に、SBSS(Styrene-Butadiene-Styrene)などのベースポリマー(熱可塑性高分子)を投入し、減圧撹拌によって混ぜる。
First, a part of a stabilizer such as a plasticizer and an adhesion-imparting agent (for example, tackifier) is put into a container having an internal temperature of 140 to 160 degrees. Next, a base polymer (thermoplastic polymer) such as SBSS (Styrene-Butadiene-Styrene) is put into the container and mixed by stirring under reduced pressure.
次いで、容器内に、残りの可塑剤・粘着付与剤などの安定剤を投入し、減圧撹拌によって混ぜる。次いで、混ぜ合わさった接着材を取り出し梱包する。このように製造された接着材の組成については、表1に示す通りである。
Next, the remaining stabilizer such as a plasticizer and a tackifier is put into the container and mixed by stirring under reduced pressure. Next, the mixed adhesive is taken out and packed. The composition of the adhesive thus manufactured is as shown in Table 1.
比較例1~10及び実施例1~8に係る延伸装置を用いて複合シート120を延伸した結果、各延伸装置により延伸された複合シート120に穴あき(ピンホール)が発生する確率(穴あき率)をそれぞれ測定した。
As a result of stretching the composite sheet 120 using the stretching apparatuses according to Comparative Examples 1 to 10 and Examples 1 to 8, the composite sheet 120 stretched by each stretching apparatus has a probability of occurrence of holes (pin holes) (perforated holes). Rate) was measured respectively.
この結果、表2及び表3に示すように、実施例1~8に係る延伸装置は、比較例1~10に係る延伸装置と比べて、穴あき率が低いことが判った。つまり、実施例1~8に係る延伸装置は、複合シート120を、接着材の軟化点(約82℃)よりも高く、複合シート120の軟化温度(約120℃)よりも低い温度で加熱している。また、実施例1~8に係る延伸装置では、前記複数の凸部が、40度よりも高くかつ接着材の軟化点(約82℃)よりも低い温度に加熱されている。このため、実施例1~8に係る延伸装置は、穴あき率が低いことが判る。
As a result, as shown in Tables 2 and 3, it was found that the stretching apparatuses according to Examples 1 to 8 had a lower perforation rate than the stretching apparatuses according to Comparative Examples 1 to 10. That is, the stretching apparatus according to Examples 1 to 8 heats the composite sheet 120 at a temperature higher than the softening point (about 82 ° C.) of the adhesive and lower than the softening temperature of the composite sheet 120 (about 120 ° C.). ing. In the stretching apparatuses according to Examples 1 to 8, the plurality of convex portions are heated to a temperature higher than 40 degrees and lower than the softening point of the adhesive (about 82 ° C.). Therefore, it can be seen that the stretching apparatuses according to Examples 1 to 8 have a low perforation rate.
以上説明した本実施形態では、複合シート120が押圧される前に加熱される。このとき、複合シート120は、接着材の軟化点よりも高く、かつ複数のシートの軟化温度のうち最も低い軟化温度(例えば、バックフィルム20A)よりも低い温度になるまで加熱される。これによれば、型押ロール機構520により複合シート120が押圧される前に、複数のシート間の接着材を柔らかくできる。
In the present embodiment described above, the composite sheet 120 is heated before being pressed. At this time, the composite sheet 120 is heated to a temperature higher than the softening point of the adhesive and lower than the lowest softening temperature (for example, the back film 20A) among the softening temperatures of the plurality of sheets. According to this, before the composite sheet 120 is pressed by the embossing roll mechanism 520, the adhesive between the plurality of sheets can be softened.
なお、接着材の軟化点よりも低い温度で複合シート120が加熱された場合、複数のシート間の接着材を軟化できない。また、複数のシート(バックフィルム20A及びバック不織布20B)の軟化温度のうち最も低い軟化温度(例えば、バックフィルム20A)よりも高い温度で複合シート120が加熱された場合、バックフィルム20Aが熱融着されて硬くなり、風合いが悪化してしまうとともに、複数のシートが破れてしまう可能性がある。
In addition, when the composite sheet 120 is heated at a temperature lower than the softening point of the adhesive, the adhesive between the plurality of sheets cannot be softened. Further, when the composite sheet 120 is heated at a temperature higher than the lowest softening temperature (for example, the back film 20A) among the softening temperatures of the plurality of sheets (the back film 20A and the back nonwoven fabric 20B), the back film 20A is heat-melted. It may be worn and hardened, the texture may deteriorate, and a plurality of sheets may be torn.
また、加熱された複合シート120は、厚さ方向Tに押圧されることで幅方向Wに延伸する。このとき、凸部532及び凸部542は、40度よりも高く、かつ接着材の軟化点よりも低い温度に加熱されている。これによれば、複数のシート間の接着材が柔らかくなった状態で、かつ複合シート120が温められた状態で、複合シート120が押圧される。このため、複数のシート間の接着材が凸部532及び凸部542に馴染み易くなる。従って、複合シート120への熱伝達が十分になり、複合シート120に目付のムラが発生することなく、穴あき(ピンホール)が発生することを確実に抑制できる。
The heated composite sheet 120 is stretched in the width direction W by being pressed in the thickness direction T. At this time, the convex part 532 and the convex part 542 are heated to a temperature higher than 40 degrees and lower than the softening point of the adhesive. According to this, the composite sheet 120 is pressed in a state where the adhesive between the plurality of sheets is soft and the composite sheet 120 is warmed. For this reason, the adhesive between a plurality of sheets becomes easy to become familiar with the convex portions 532 and the convex portions 542. Therefore, heat transfer to the composite sheet 120 is sufficient, and the occurrence of perforations (pinholes) can be reliably suppressed without causing unevenness in the weight of the composite sheet 120.
なお、40度よりも低い温度で凸部が加熱された場合、柔らかくなった複合シート120間の接着材は、型押ロール機構520を通過する際に複数のシート間から滲み出して、凸部の表面に付着しやすい。この凸部の表面に付着した接着材が複合シート120に付着し、複合シート120へ接着材が付着することによる穴あきなどの製造不良が発生してしまうことがある。
In addition, when the convex part is heated at a temperature lower than 40 degrees, the adhesive material between the composite sheets 120 that has become soft oozes out between the plurality of sheets when passing through the embossing roll mechanism 520, and the convex part Easy to adhere to the surface. Adhesive material adhering to the surface of the convex portion may adhere to the composite sheet 120, and manufacturing defects such as perforations due to the adhesive material adhering to the composite sheet 120 may occur.
また、接着材の軟化点よりも高い温度で凸部が加熱された場合、凸部532及び凸部542との嵌合部分のみが延伸してしまい、嵌合部分に加わるダメージが大きくなってしまい、複合シート120に目付のムラが発生し、穴あき(ピンホール)が発生しやすくなる。
Further, when the convex portion is heated at a temperature higher than the softening point of the adhesive, only the fitting portion between the convex portion 532 and the convex portion 542 is extended, and the damage applied to the fitting portion is increased. Further, the unevenness of the weight per unit area is generated in the composite sheet 120, and perforation (pinhole) is likely to occur.
このように、本実施形態に係る吸収性物品の製造方法及び延伸装置500によれば、複数のシートが接着材により貼り合わされた複合シート120にダメージを与えることなく、幅方向Wに均一に延伸できる。
Thus, according to the manufacturing method of the absorbent article and the stretching apparatus 500 according to the present embodiment, a plurality of sheets are stretched uniformly in the width direction W without damaging the composite sheet 120 bonded with the adhesive. it can.
本実施形態では、複合シート120は、複数のシートの軟化温度のうち最も低い軟化温度よりも少なくとも20度以下の温度に加熱される。なお、複数のシートの軟化温度のうち最も低い軟化温度よりも少なくとも20度低い温度よりも高い温度で複合シート120が加熱されると、複合シート120の一部が熱融着されて硬くなり過ぎてしまう場合がある。
In the present embodiment, the composite sheet 120 is heated to a temperature of at least 20 degrees or less than the lowest softening temperature among the softening temperatures of the plurality of sheets. When the composite sheet 120 is heated at a temperature higher than at least 20 degrees lower than the lowest softening temperature among the softening temperatures of the plurality of sheets, a part of the composite sheet 120 is heat-sealed and becomes too hard. May end up.
本実施形態では、複合シート120は、スパイラルパターンで塗布された接着材により接合される。これによれば、スパイラルパターンでは、接着材は、複合シート120に霧状に噴射し、線形が細くかつ高密度で塗布される。このため、複合シート120に延伸加工を施す際に、複合シート120の延伸にムラが生じにくく、穴あき(ピンホール)がさらに発生しにくくなる。
In this embodiment, the composite sheet 120 is joined by an adhesive applied in a spiral pattern. According to this, in the spiral pattern, the adhesive material is sprayed onto the composite sheet 120 in a mist form, and is applied with a thin linear shape and a high density. For this reason, when the composite sheet 120 is stretched, the composite sheet 120 is less likely to be unevenly stretched, and perforations (pinholes) are further less likely to occur.
(その他の実施形態)
上述したように、本発明の実施形態を通じて本発明の内容を開示したが、この開示の一部をなす論述及び図面は、本発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態、実施例及び運用技術が明らかとなろう。 (Other embodiments)
Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.
上述したように、本発明の実施形態を通じて本発明の内容を開示したが、この開示の一部をなす論述及び図面は、本発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態、実施例及び運用技術が明らかとなろう。 (Other embodiments)
Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.
例えば、本発明の実施形態は、次のように変更することができる。具体的には、複合シート120は、裏面シート20に使用されるものとして説明したが、これに限定されるものではなく、複数のシートによって構成される部材(例えば、表面シート)であればよく、使い捨ておむつや生理用ナプキンなど様々な吸収性物品の部材に使用されていてもよい。
For example, the embodiment of the present invention can be modified as follows. Specifically, the composite sheet 120 has been described as being used for the back sheet 20, but is not limited thereto, and may be a member (for example, a front sheet) configured by a plurality of sheets. Moreover, you may be used for the member of various absorbent articles, such as a disposable diaper and a sanitary napkin.
また、凸部(凸部532及び凸部542)の形状は、軸芯方向における断面において、先細状(略三角形状)であるものとして説明したが、これに限定さるものではなく、四角状や台形状、円弧状などであってもよい。
Moreover, although the shape of the convex part (the convex part 532 and the convex part 542) has been described as having a tapered shape (substantially triangular shape) in the cross section in the axial direction, the shape is not limited to this, It may be trapezoidal or arcuate.
また、シート貼合工程S10では、バックフィルム20Aが連続したバックシート120Aと、バック不織布20Bが連続した不織布シート120Bとを貼り合わせるものとして説明したが、これに限定されるものではなく、バックフィルム20Aを不織布シート120Bに間欠的に貼り合わせてもよい。
Moreover, in sheet | seat bonding process S10, although demonstrated as what bonds back sheet | seat 120A in which back film 20A continued, and nonwoven fabric sheet | seat 120B in which back nonwoven fabric 20B continued, it is not limited to this, Back film 20A may be intermittently bonded to the nonwoven fabric sheet 120B.
なお、吸収性物品の製造方法は、シート貼合工程S10~製品切断工程S90を有するものとして説明したが、これに限定されるものではなく、少なくともシート加熱工程S20と、シート延伸工程S30と、吸収体接合工程S50と有していればよく、目的に応じて適宜設定できることは勿論である。
The manufacturing method of the absorbent article has been described as having the sheet bonding step S10 to the product cutting step S90, but is not limited to this, and at least the sheet heating step S20, the sheet stretching step S30, Needless to say, the absorber bonding step S50 can be set as appropriate according to the purpose.
このように、本発明は、ここでは記載していない様々な実施の形態などを含むことは勿論である。したがって、本発明の技術的範囲は、上述の説明から妥当な特許請求の範囲に係る発明特定事項によってのみ定められるものである。
Thus, it goes without saying that the present invention includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.
なお、日本国特許出願第2009-200709号(2009年8月31日出願)の全内容が、参照により、本願明細書に組み込まれている。
Note that the entire contents of Japanese Patent Application No. 2009-200709 (filed on August 31, 2009) are incorporated herein by reference.
本発明の特徴によれば、複数のシートが接着材により貼り合わされた複合シートにダメージを与えることなく、幅方向に均一に延伸できる吸収性物品の製造方法、及び、吸収性物品の製造方法に用いられる延伸装置を提供することができる。
According to the characteristics of the present invention, a method for manufacturing an absorbent article that can be uniformly stretched in the width direction without damaging a composite sheet in which a plurality of sheets are bonded together with an adhesive, and a method for manufacturing the absorbent article. The drawing apparatus used can be provided.
Claims (5)
- 複数のシートが接着材により貼り合わされた複合シートと、前記複合シートに貼り付けられる吸収体とを少なくとも備える吸収性物品の製造方法であって、
前記複合シートの搬送方向に沿って回転する加熱ロールによって、前記搬送方向に沿って搬送される前記複合シートを加熱する工程Aと、
外周に複数の凸部が形成され、前記複合シートを挟んで一方の前記凸部の間に他方の前記凸部が嵌合する一対の型押ロール機構によって、前記複合シートを前記搬送方向に直交する交差方向に延伸する工程Bと
を有し、
前記工程Aでは、
前記複合シートは、前記接着材の軟化点よりも高く、かつ前記複数のシートの軟化温度のうち最も低い軟化温度よりも低い温度になるまで加熱され、
前記工程Bでは、
前記複数の凸部は、40度よりも高く、かつ前記接着材の軟化点よりも低い温度に加熱される吸収性物品の製造方法。 A method of manufacturing an absorbent article comprising at least a composite sheet in which a plurality of sheets are bonded together with an adhesive, and an absorber attached to the composite sheet,
Step A of heating the composite sheet transported along the transport direction by a heating roll rotating along the transport direction of the composite sheet;
A plurality of convex portions are formed on the outer periphery, and the composite sheet is orthogonal to the transport direction by a pair of embossing roll mechanisms in which the other convex portion is fitted between the one convex portion with the composite sheet interposed therebetween. Step B extending in the crossing direction
In step A,
The composite sheet is heated to a temperature higher than the softening point of the adhesive and lower than the lowest softening temperature among the softening temperatures of the plurality of sheets,
In step B,
The method for producing an absorbent article, wherein the plurality of convex portions are heated to a temperature higher than 40 degrees and lower than a softening point of the adhesive. - 前記工程Aでは、
前記複合シートは、前記複数のシートの軟化温度のうち最も低い軟化温度よりも少なくとも20度以下の温度に加熱される請求項1に記載の吸収性物品の製造方法。 In step A,
The said composite sheet is a manufacturing method of the absorbent article of Claim 1 heated to the temperature of at least 20 degrees or less from the lowest softening temperature among the softening temperature of these sheets. - 前記複合シートは、スパイラルパターンで塗布された前記接着材により接合される請求項1に記載の吸収性物品の製造方法。 The method for manufacturing an absorbent article according to claim 1, wherein the composite sheet is joined by the adhesive applied in a spiral pattern.
- 前記工程Bの後に行われ、前記複合シートの幅方向の側部の少なくとも一方に設けられる拡幅ロール機構によって、前記複合シートを前記複合シートの幅方向外側に向けて平坦状になるまで拡幅する工程を有する請求項1乃至3の何れか一項に記載の吸収性物品の製造方法。 Step of widening the composite sheet until it becomes flat toward the outside in the width direction of the composite sheet by a widening roll mechanism provided after at least one of the side portions in the width direction of the composite sheet. The manufacturing method of the absorbent article as described in any one of Claims 1 thru | or 3 which has these.
- 複数のシートが接着材により貼り合わされた複合シートを、複合シートの搬送方向に沿って搬送しながら前記搬送方向に直交する交差方向に延伸する延伸装置であって、
前記複合シートの前記搬送方向に沿って回転し、前記複合シートを加熱する加熱ロールと、
外周に複数の凸部が形成され、前記複合シートを挟んで一方の前記凸部の間に他方の前記凸部が嵌合する一対の型押ロール機構と
を有し、
前記加熱ロールは、前記複合シートを前記接着材の軟化点よりも高く、かつ前記複数のシートの軟化温度のうち最も低い軟化温度よりも低い温度に加熱する第1加熱部を有し、
前記型押ロール機構は、前記複数の凸部を40度よりも高く、かつ前記接着材の軟化点よりも低い温度に加熱する第2加熱部を有する延伸装置。 A stretching device that stretches a composite sheet in which a plurality of sheets are bonded together with an adhesive, in a crossing direction orthogonal to the transport direction while transporting along the transport direction of the composite sheet,
A heating roll that rotates along the conveying direction of the composite sheet and heats the composite sheet;
A plurality of convex portions are formed on the outer periphery, and a pair of embossing roll mechanisms with which the other convex portion is fitted between the one convex portion across the composite sheet,
The heating roll has a first heating unit that heats the composite sheet to a temperature higher than the softening point of the adhesive and lower than the lowest softening temperature among the softening temperatures of the plurality of sheets,
The embossing roll mechanism includes a second heating unit that heats the plurality of convex portions to a temperature higher than 40 degrees and lower than the softening point of the adhesive.
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JP2009200709A JP5623042B2 (en) | 2009-08-31 | 2009-08-31 | Absorbent article manufacturing method and stretching apparatus |
JP2009-200709 | 2009-08-31 |
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WO2013119484A1 (en) * | 2012-02-06 | 2013-08-15 | The Procter & Gamble Company | Apparatuses and methods for fabricating elastomeric laminates |
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JP6083911B2 (en) * | 2014-12-19 | 2017-02-22 | 花王株式会社 | Absorbent articles |
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