WO2020230479A1 - 複合伸縮部材の製造装置 - Google Patents
複合伸縮部材の製造装置 Download PDFInfo
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- WO2020230479A1 WO2020230479A1 PCT/JP2020/015713 JP2020015713W WO2020230479A1 WO 2020230479 A1 WO2020230479 A1 WO 2020230479A1 JP 2020015713 W JP2020015713 W JP 2020015713W WO 2020230479 A1 WO2020230479 A1 WO 2020230479A1
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- WIPO (PCT)
- Prior art keywords
- guide
- elastic member
- sheets
- groove
- manufacturing
- Prior art date
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Classifications
-
- 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
-
- 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
- A61F13/49011—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region
-
- 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
- A61F13/15699—Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
-
- 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
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/4871—Underwear
- B29L2031/4878—Diapers, napkins
Definitions
- the present invention relates to a manufacturing apparatus for manufacturing a composite telescopic member.
- worn items such as disposable diapers having a waistline portion and an inseam portion have been known.
- the waistline portion of the worn articles may be formed of a stretchable composite elastic member in order to improve the comfort of wearing.
- Patent Document 1 As an apparatus for manufacturing a composite telescopic member, for example, the one described in Patent Document 1 is known.
- a seal pattern convex portion is formed on the outer periphery of the anvil roll, and a welded portion is formed on the two sheets corresponding to the seal pattern convex portion. Further, a groove is formed in the convex portion of the seal pattern corresponding to a portion where the elastic elastic member is arranged. The depth of the groove is set so that a part of the elastic elastic member protrudes from the groove when the elastic elastic member is inserted into the groove.
- the elastic elastic member By inserting a part of the elastic elastic member into this groove, the elastic elastic member is sandwiched between the ultrasonic welding horn and the convex portion of the seal pattern of the anvil roll and ultrasonically welded. The pressure to pinch is relieved. Thereby, it is possible to weld the two sheets and the elastic elastic member without cutting the elastic elastic member.
- a guide member is provided on the upstream side of the anvil roll in the direction of supplying the elastic elastic member to the anvil roll.
- the guide member is arranged apart from the outer peripheral surface of the anvil roll, and guides the elastic elastic member into the groove of the convex portion of the seal pattern on the anvil roll.
- the elastic stretchable member is guided to the groove of the convex portion of the seal pattern on the anvil roll by the guide member, but the elastic stretchable member may come off from the groove due to the influence of vibration of the device, and the elastic stretchable member It is an issue to improve the cutting prevention function by reducing the trouble that the member comes off from the groove.
- An object of the present invention is to provide a manufacturing apparatus for a composite telescopic member capable of reducing a defect that an elastic member comes off from a groove of a transport roller and improving a cutting prevention function.
- the apparatus for manufacturing a composite elastic member of the present invention joins two sheets and these sheets and a plurality of elastic members to each other while transporting the two sheets along the longitudinal direction thereof.
- a joining device that welds and joins each elastic member, the sheet, and the two sheets with the elastic member sandwiched between the elastic members, and each elastic member extends in the longitudinal direction thereof.
- the two sheets and a guide device for guiding each of the elastic members to the joining device are provided so as to be sandwiched between the two sheets, and the joining device includes the two in which the elastic members are sandwiched.
- the guide device is provided at the tip closest to the outer peripheral surface of the transport roller and at the tip so as to guide the plurality of elastic members to the plurality of grooves of the transport roller.
- a guide member having the plurality of guide grooves for holding the plurality of elastic members in a state of being separated from each other in a direction parallel to the axis of the transfer roller is provided, and the guide member is the guide groove and the transfer roller. It is characterized in that the elastic member located between the groove and the elastic member is arranged so that the length is 30 mm or less.
- FIG. 2 is a part of a sectional view taken along line II-II of FIG. It is a schematic cross-sectional view which shows the cross section of an elastic member. It is a figure corresponding to FIG. 1 and is a figure which shows the joint part schematically. It is a figure which showed the part of FIG. 1 enlarged. It is a schematic explanatory drawing which shows the structure of the manufacturing apparatus of the composite telescopic member which concerns on embodiment of this invention. It is a top view of the guide plate of FIG. It is a side view of the guide plate of FIG. It is an enlarged view of the guide groove of the guide plate of FIG.
- FIG. 11 is an enlarged view showing a convex portion and a groove on the outer peripheral surface of the anvil roll of FIG.
- FIG. 12 is a cross-sectional view taken along the line XIII-XIII of FIG.
- FIG. 12 is a cross-sectional view taken along the line XIV-XIV of FIG. It is a development view of the disposable diaper which used the composite telescopic member.
- FIG. 17 It is a figure which shows each stage 1 to 3 schematicly in order to explain the manufacturing method of the disposable diaper shown in FIG. It is a figure which shows the structure which shows the structure which the guide plate can move between the position which is close to an anvil roll and the position which is separated from an anvil roll in the manufacturing apparatus which concerns on the modification of this invention, and the guide plate becomes an anvil roll. It is a figure which shows the state which is in a close position (the position when a manufacturing apparatus is operating). It is a figure which shows the state which the guide plate of FIG. 17 is at the position separated from the anvil roll (the position when the elastic member (thread rubber etc.) is passed through).
- FIG. 1 is a plan view of the composite telescopic member manufactured by the manufacturing apparatus according to the embodiment of the present invention.
- FIG. 2 is a part of a sectional view taken along line II-II of FIG.
- the composite elastic member 1 includes two long sheets 2a and 2b facing each other and a plurality of long elastic members 10 that can be expanded and contracted in the longitudinal direction A.
- Each elastic member 10 can be expanded and contracted between both sheets 2a and 2b in the longitudinal direction A (left-right direction in FIG. 1) of each sheet 2a and 2b, that is, in the longitudinal direction A of each sheet 2a and 2b. It is arranged so as to extend and contract along the longitudinal direction A.
- these elastic members 10 are arranged at equal intervals with each other in the width direction B of the sheets 2a and 2b (the direction orthogonal to the longitudinal direction A of the sheets 2a and 2b), and the longitudinal directions A of the sheets 2a and 2b. It extends parallel to.
- sheet-like materials such as non-woven fabric are used as both sheets 2a and 2b.
- the elastic member 10 a material having elasticity as compared with the material of the sheets 2a and 2b (nonwoven fabric or the like) is used, and the material of the elastic member 10 is not particularly limited in the present invention.
- the elastic member 10 is a multi-strand in which a plurality of thread rubbers (fibrous elastic bodies) 10a are assembled in a bundle, and at least a part of the thread rubbers 10a is formed.
- the circumference of the rubber thread 10a is covered with the coating layer 10b.
- the thread rubber 10a arranged on the outer peripheral portion of the plurality of thread rubbers 10a is covered with the coating layer 10b.
- all the rubber threads 10a may be covered with the coating layer 10b.
- Examples of the material of the rubber thread 10a include polyurethane.
- Examples of the material of the coating layer 10b include lubricants such as silicone oil and magnesium stearate.
- Both sheets 2a and 2b, and both sheets 2a and 2b and the elastic member 10 are joined at a grid-like joint 4 as shown in FIG.
- FIG. 4 schematically shows the joint portion of FIG. As shown in FIGS. 1 and 4, the joint portion 4 has a plurality of first joint portions 4a and a plurality of second joint portions 4b.
- Each of the first joint portions 4a is arranged at equal intervals in the longitudinal direction A of both sheets 2a and 2b, and extends parallel to each other so as to face the width direction B of these sheets 2a and 2b.
- the second joints 4b are also arranged at equal intervals in the longitudinal direction A of both sheets 2a and 2b, and extend parallel to each other so as to face the width direction B of these sheets 2a and 2b. Each of the second joints 4b extends so as to intersect each of the first joints 4a, thereby forming a grid-like joint 4.
- both the first joint portion 4a and the second joint portion 4b are inclined with respect to the width direction B of the sheets 2a and 2b.
- the inclination angle is set to be smaller than 45 degrees.
- this tilt angle is set to 30 degrees.
- first joint portion 4a and the second joint portion 4b have symmetrical shapes with respect to both straight lines extending in the longitudinal direction A and the width direction B of the sheets 2a and 2b, respectively. Further, the first joint portion 4a and the second joint portion 4b are arranged so that the separation distance between the two adjacent first joint portions 4a and the separation distance between the two adjacent second joint portions 4b match. Has been done. Along with this, the joint portion 4 partitions a plurality of rhombuses whose diagonal lines extend along the longitudinal direction A and the width direction B of the sheets 2a and 2b.
- this width direction B has a diamond shape that extends to B.
- the intersections (hereinafter, may be referred to as joint side intersections) 4c between the first joint portion 4a and the second joint portion 4b are lined up at equal intervals on a straight line extending in the longitudinal direction A of the sheets 2a and 2b.
- the sheets 2a and 2b are arranged at equal intervals on a straight line extending in the width direction B.
- Each joint 4 intersects with all elastic members 10 and extends along a line intersecting the expansion / contraction direction (that is, the longitudinal direction A) of the elastic members 10. Specifically, each joint portion 4 extends from the region where the elastic member 10 is arranged over both outer portions of the sheets 2a and 2b in the width direction B.
- Each elastic member 10 and the joint portion 4 intersect at a portion other than the joint portion side intersection 4c, that is, at a position separated from the joint portion side intersection 4c, and at this position, each elastic member 10 and each sheet 2a, 2b Is joined with.
- FIG. 1 A part of FIG. 1 will be described in detail with reference to FIG.
- Each elastic member 10 is placed between two adjacent joint-side intersections 4c on each first joint 4a (for example, between the joint-side intersection 4c_1 and the joint-side intersection 4c_2 shown in FIG. 5 and the joint-side). It is arranged so as to pass through the intersection 4c_2 and the joint side intersection 4c_3). That is, the first elastic member side intersection 4d, which is the intersection of each elastic member 10 and each first joint portion 4a, is located between two adjacent joint portion side intersections 4c on the first joint portion 4a. The elastic member 10 and the sheets 2a and 2b are joined at this position 4d.
- each elastic member 10 is placed between adjacent joint-side intersections 4c on each second joint 4b (for example, between joint-side intersections 4c_4 and joint-side intersections 4c_2 shown in FIG. 5 and joints. It is arranged so as to pass between the side intersection 4c_2 and the joint side intersection 4c_5). That is, the second elastic member side intersection 4e, which is the intersection of each elastic member 10 and each second joint portion 4b, is located between two adjacent joint portion side intersections 4c on the second joint portion 4b. At this position 4e, the elastic member 10 and the sheets 2a and 2b are joined.
- each elastic member 10 is at the center of adjacent joint side intersections 4c, 4c on each first joint 4a and at the center of adjacent joint side intersections 4c, 4c on each second joint 4b. At these central positions, they intersect the first joint portion 4a and the second joint portion 4b and are joined to the sheets 2a and 2b.
- first elastic member side intersection 4d and the second elastic member side intersection 4e are alternately arranged on a straight line extending in the width direction B of both sheets 2a and 2b. Further, the intersections of the elastic members 10 and the joints 4, that is, the joints 4d and 4e of the elastic members 10 and the sheets 2a and 2b are arranged at equal intervals in the longitudinal direction A of the sheets 2a and 2b.
- the sheets 2a and 2b, and the sheets 2a and 2b and the elastic member 10 are joined to each other by welding. In this embodiment, they are ultrasonically welded.
- the sheets 2a and 2b are joined by melting a part of them and welding them to each other.
- the elastic member 10 and the sheets 2a and 2b are welded to each other by melting a part of the sheets 2a and 2b and melting the coating layer 10b of the elastic member 10.
- a rubber thread having a melting point of about 200 ° C. is used as the rubber thread 10a, and magnesium stearate having a melting point lower than this (melting point: about 120 ° C.) is used as the coating layer 10b.
- the coating layer 10b is melted without melting the rubber thread 10a, and the coating layer 10b and the sheets 2a and 2b are welded.
- FIG. 6 is a schematic view of the manufacturing apparatus 100 according to the embodiment of the present invention.
- the manufacturing apparatus 100 includes a joining apparatus 200 that ultrasonically welds and joins the elastic member 10, the sheets 2a and 2b, and the sheets 2a and 2b with the elastic member 10 sandwiched between the sheets 2a and 2b, and the sheet.
- the first guide roller 102 that guides 2a to the joining device 200 (specifically, the anvil roll 210 described later), the elastic member guiding device (guidance device) 110 that supplies the elastic member 10 to the joining device 200, and the sheet 2b.
- a nip roll (second guide roller) 104 that guides the two sheets 2a and 2b and the elastic member 10 while guiding the joining device 200, and a third guide roller 106 that guides the joined sheet or the like, that is, the composite telescopic member 1.
- the joining device 200 has an anvil roll (conveying roller) 210 and a horn (pressurizing device) 220.
- the anvil roll 210 is a rotating member that rotates about an axis extending in a direction orthogonal to the paper surface of FIG.
- the direction orthogonal to the paper surface of FIG. 6 is referred to as a "front-back direction”.
- the anvil roll 210 is rotatably attached to a portion of a vertical wall in a device such as a mirror plate (not shown) with a rotation axis extending in the horizontal direction as a rotation center.
- the anvil roll 210 conveys the elastic member 10 guided by the elastic member guide device 110 between the sheets 2a and 2b guided by the rollers 102 and 104 on the outer peripheral surface thereof. ..
- the anvil roll 210 rotates counterclockwise in FIG.
- the sheets 2a and 2b sandwiching the elastic member 10 may be referred to as a pre-joining sheet.
- a convex portion 212 is formed on the outer peripheral surface of the anvil roll 210 so as to protrude outward in the radial direction of the outer peripheral surface.
- the convex portion 212 is provided on the outer peripheral surface of the anvil roll 210 over the entire circumferential direction.
- the convex portion 212 has a shape corresponding to the joint portion 4.
- the joint portion 4 has a diamond-shaped grid shape
- the convex portion 212 has a corresponding diamond-shaped grid shape.
- the convex portion 212 includes a first convex portion 212a for forming the first joint portion 4a and a second convex portion 212b for forming the second joint portion 4b.
- the first convex portions 212a extend along a direction (first direction C1) intersecting the circumferential direction of the anvil roll 210 (transportation direction of the anvil roll 210), that is, along a line intersecting the circumferential direction, and extend from each other. A plurality of them are arranged in parallel and at equal intervals in the circumferential direction.
- the second convex portion 212b extends along the circumferential direction of the anvil roll 210 and the direction intersecting the first direction C1 (second direction C2), that is, along the line intersecting the circumferential direction, and is parallel to each other.
- a plurality of anvil rolls 210 are arranged at equal intervals in the circumferential direction.
- the first convex portion 212a and the second convex portion 212b are inclined so as to be symmetrical with each other at an angle smaller than 45 degrees with respect to the front-rear direction, and the two adjacent first convex portions 212a are adjacent to each other.
- the separation distance between the two adjacent second convex portions 212b is the same, and the intersection 212c between the first convex portion 212a and the second convex portion 212b extends in the front-rear direction and in the circumferential direction of the anvil roll 210. It is provided so that they are lined up at equal intervals.
- FIG. 12 is a partially enlarged view of FIG. 11, FIG. 13 which is a sectional view taken along line XIII-XIII of FIG. 12, and FIG. 14 which is a sectional view taken along line XIV-XIV of FIG.
- Grooves 214 (214a, 214b) recessed inward in the radial direction of the anvil roll 210 are formed in the 212a and the second convex portion 212b, respectively.
- a plurality of grooves 214 are formed in the first convex portion 212a and the second convex portion 212b at positions separated from each other in the longitudinal directions C1 and C2.
- each first convex portion 212a a portion between the intersections 212c with the second convex portion 212b, more specifically, adjacent intersections.
- Grooves (first grooves) 214a extending in the circumferential direction of the anvil roll 210 are formed in the central portion of the 212c, respectively.
- a groove (second groove) 214b is formed in a portion between the intersections 212c with the first convex portion 212a, more specifically, in a central portion of the adjacent intersection 212c. Has been formed.
- the grooves 214 are arranged at equal intervals on a line extending along the circumferential direction of the anvil roll 210 and on a straight line extending along the front-rear direction (that is, in a direction parallel to the rotation axis of the anvil roll 210, in other words, rotating. They are provided at equal intervals (in the same direction as the extending direction of the shaft).
- the portion of the sheet 2a where the elastic member 10 is arranged is conveyed by the anvil roll 210 in a state of being inserted into each groove 214.
- the elastic member 10 is guided to each groove 214 by the guide plate 112 provided with the guide groove 114b at the position corresponding to each groove 214, so that the elastic member 10 is on the sheet 2a. It is stably placed in the proper position of.
- a part of the elastic member 10 in addition to the sheet 2a is conveyed by the anvil roll 210 in a state of being inserted into these grooves 214. It should be noted that the sheet 2a may be conveyed with only the sheet inserted.
- the groove 214 is formed in the portion of the convex portion 212 on which the elastic member 10 is arranged, when the pre-joining sheet is pinched at the time of joining, the elastic member arranged on the pre-joining sheet is formed. At least a part of 10 is in a state of being retracted into this groove. Therefore, it is avoided that the elastic member 10 is cut due to the pinching pressure.
- the cross-sectional area of the groove 214 is too large, it may be difficult to properly join the elastic member 10 and the sheets 2a and 2b. Therefore, in the present embodiment, as shown in FIG. 14, when the elastic member 10 having a natural length is arranged in the groove 214, a part of the elastic member 10 protrudes outward from the groove 214, and the remaining elastic member 10 remains. Is accommodated in the groove 214.
- the shape of the cross section of the groove 214 cut in a plane orthogonal to the circumferential direction (transport direction) of the anvil roll 210 is the open end of the groove 214 in a state where the elastic member 10 has a natural length and is arranged in the groove 214.
- a part of the elastic member 10 is set so as to protrude outward in the radial direction of the anvil roll 210 from the linear virtual line L10 connecting (Q1 and Q2).
- the cross-sectional shape of the groove 214 has an open end (Q1, Q2) of the groove 214 when the elastic member 10 in a state of being extended from the natural state (for example, a state of being extended by 300%) is arranged in the groove 214.
- a substantially V shape is preferable.
- the cross-sectional area S1 of such a groove 214 is preferably smaller than the cross-sectional area of the elastic member 10 to be arranged.
- the cross-sectional shape of the groove 214 is not limited to the V shape, and may be another shape such as a U shape.
- the elastic member 10 is retracted into the groove 214 at the time of ultrasonic welding, and the elastic member is arranged in the groove. 10 and the sheets 2a and 2b can be joined by appropriately applying pressure. Therefore, the sheets 2a and 2b and the elastic members 10 can be more reliably joined to each other while suppressing damage to the elastic members 10. Specifically, of the elastic member 10, while appropriately applying pressure to the portions of the elastic member 10 protruding outside the virtual line L10 connecting the opening ends Q1 and Q2 of the groove 214 and the sheets 2a and 2b.
- the portion inside the virtual line L10 that is, the portion housed in the groove 214 can be retracted to the inside of the groove 214 (the side away from the horn 220). Therefore, damage to the elastic member 10 can be suppressed while ensuring the joining force between the elastic member 10 and the sheets 2a and 2b.
- the elastic member 10 in a state of being extended by 300% when the elastic member 10 in a state of being extended by 300% is arranged in the groove 214, a part of the elastic member 10 has an open end (Q1, Q2) of the groove 214. If it is set so as to protrude outward in the radial direction of the anvil roll 210 from the linear virtual line L10 to be connected, the elastic members 10 are more appropriately pressured while suppressing damage to the elastic members 10. Can be added to more reliably join them to each other.
- the horn 220 shown in FIGS. 6 and 10 holds the pre-joining sheet conveyed by the anvil roll 210 with the outer peripheral surface of the anvil roll 210 while pressing (pressurizing while sandwiching) the pre-joining sheet. It is a device that applies ultrasonic vibration to the sheet.
- the horn 220 is arranged so as to face the outer peripheral surface of the anvil roll 210.
- the anvil roll 210 is arranged so as to face the upper portion of the outer peripheral surface.
- an output unit 221 that applies ultrasonic vibration toward the outer peripheral surface of the anvil roll 210 is provided.
- the horn 220 presses the output unit 221 against the pre-joining sheet and applies ultrasonic vibration to the pre-bonding sheet while sandwiching the pre-bonding sheet with the anvil roll 210.
- the sheets 2a and 2b are melted and welded to each other.
- the elastic member 10 is also melted, and the elastic member 10 and the sheets 2a and 2b are welded to each other.
- the output unit 221 sandwiches the pre-joining sheet with the convex portion 212, and the sheets 2a and 2b and the elastic member 10 in the pre-joining sheet arranged on the convex portion 212.
- the sheets 2a and 2b are joined to each other.
- the tip of the output unit 221 has a flat shape (see FIGS. 13 and 14).
- magnesium stearate having a melting point lower than that of the rubber thread 10a is used as the coating layer 10b. Therefore, when the elastic member 10 and the sheets 2a and 2b are welded, the coating layer 10b is melted without melting the rubber thread 10a, and the coating layer 10b and the sheets 2a and 2b are welded.
- the output unit 221 at the tip of the horn 220 extends in the front-rear direction, and the horn 220 applies ultrasonic vibration to the outer peripheral surface of the anvil roll 210 in the entire rotation axis direction of the anvil roll 210.
- the horn 220 constantly applies ultrasonic vibration while the pre-bonded sheet is conveyed by the anvil roll 210. Therefore, as the pre-bonded sheet is conveyed by the anvil roll 210, the pre-bonded sheet is continuously joined.
- the seat 2a is guided by the first guide roller 102 to a position on the outer peripheral surface of the anvil roll 210 away from the horn 220 on the upstream side.
- the sheet 2a is conveyed to the horn 220 side along the outer peripheral surface of the anvil roll 210 as the anvil roll 210 rotates.
- the sheet 2b is introduced by the nip roll 104 to a portion of the outer peripheral surface of the anvil roll 210 in the vicinity of the horn 220 and upstream of the horn 220 in the transport direction.
- the elastic member 10 is introduced on the outer peripheral surface of the anvil roll 210 by the elastic member guide device 110 at a position between the position where the sheet 2a is introduced into the anvil roll 210 and the position where the sheet 2b is introduced into the anvil roll 210. Will be done. As a result, the elastic member 10 is conveyed to a position facing the horn 220 while being sandwiched between the sheets 2a and 2b.
- the position where the sheet 2b is introduced from the nip roll 104 to the anvil roll 210 may be any position between the position where the elastic member 10 is introduced and the position facing the horn 220, but facing the horn 220. It is preferable that the position is closer to the position where the horn 220 is used, and more preferably the position is close to the position facing the horn 220.
- the nip roll 104 is in the transport direction of the sheets 2a and 2b (that is, the rotation direction of the anvil roll 210 (counterclockwise in FIG. 10 (a))). Is arranged at the position closest to the upstream side of the horn 220. In this case, it is possible to prevent the elastic member 10 introduced on the outer peripheral surface of the anvil roll 210 from being displaced by being covered with the sheet 2b at an early stage.
- the elastic members 10 are introduced on the outer peripheral surface of the anvil roll 210 in a state of being arranged parallel to each other in the front-rear direction, and on the outer peripheral surface of the anvil roll 210, on the sheet 2a previously introduced on the outer peripheral surface of the anvil roll 210. They are placed parallel to each other in the width direction B. Further, the elastic member 10 is introduced into the anvil roll 210 in a state of being extended in the circumferential direction of the anvil roll 210. In the present embodiment, the elastic member 10 is introduced into the anvil roll 210 in a state of being extended to 300% of the natural state (the natural state is 100%).
- the elastic member guide device 110 has a plurality of guide rolls 111 and a plate-shaped guide plate 112 as a guide member.
- Each of the guide rolls 111 is a rotating member that can rotate around an axis extending in the front-rear direction, and guides the elastic member 10 toward the anvil roll 210 in a stretched state (for example, a 300% stretched state).
- the guide plate 112 is formed on the outer peripheral surface of the anvil roll 210 with the elastic members 10 separated from each other in the front-rear direction (that is, the direction parallel to the axis of the anvil roll 210). It is a flat plate-shaped member that guides the plurality of grooves 214 (see FIGS. 11 to 14).
- the guide plate 112 has a tip 114a, which is the edge closest to the outer peripheral surface of the anvil roll 210, and a base end located farther from the anvil roll 210 than the tip 114a, and is in the direction of contacting and separating from the anvil roll 210. It is arranged so as to extend in the front-back direction as well as in the front-back direction.
- the thickness t vertical dimension shown in FIG. 8 of the guide plate 112 is set small so that the guide plate 112 and the sheets 2a and 2b do not interfere with each other, and the guide plate 112 has a thin plate shape. have.
- the tip 114a of the guide plate 112 has a tapered shape. Specifically, as shown in FIG. 8, the tip portion (the portion on the anvil roll 210 side) of the guide plate 112 has an inclined surface 114c that is inclined so as to approach the bottom surface 114d of the guide plate 112 toward the tip 114a. Is formed. The inclined surface 114c and the bottom surface 114d form a tapered tip 114a. In the present embodiment, the angle ⁇ 2 formed by the inclined surface 114c and the bottom surface 114d is set to about 10 degrees.
- the tip 114a of the guide plate 112 is in the direction of rotation of the anvil roll 210 with respect to the contact P2 in contact with the elastic member 10 on the outer peripheral surface of the anvil roll 210 (counterclockwise in FIG. 10). It is arranged on the upstream side (right side in FIG. 10) in the clockwise direction) and faces the upstream side.
- the guide plate 112 is fixed in a stationary state at a predetermined position facing the outer peripheral surface of the anvil roll 210.
- the guide plate 112 is fixed to the fixing member 113 fixed to the end plate or the like inside the apparatus so as not to move by screwing or the like.
- a plurality of guide grooves 114b are formed at the tapered tip 114a of the guide plate 112. Specifically, the plurality of guide grooves 114b are formed at positions at the tip 114a of the guide plate 112 at equal intervals in the front-rear direction (direction parallel to the axis of the anvil roll 210), and the plurality of elastic members 10 Each elastic member 10 is individually held so as to guide each of the plurality of grooves 214 of the anvil roll 210. As shown in FIG. 9 which shows a part of the guide groove 114b of FIG. 7 in an enlarged manner, these guide grooves 114b are recessed from the tip 114a of the inclined surface 114c toward the base end side and have a V shape with an opening degree of 90 degrees. have.
- the cross-sectional shape of the guide groove 114b is not limited to the V shape, and may be another shape such as a U shape.
- These guide grooves 114b reliably position and hold each elastic member 10 in order to guide each elastic member 10 to the outer peripheral surface of the anvil roll 210 in a state of being separated from each other in the front-rear direction.
- These guide grooves 114b are provided at the same intervals as the grooves 214 facing the grooves 214 formed in the anvil roll 210, and guide the elastic member 10 to each of the grooves 214.
- the tip 114a of the guide plate 112 and the guide groove 114b formed in the tip 114a are oriented in the opposite direction (that is, clockwise) to the rotation direction of the anvil roll 210 (counterclockwise in FIGS. 6 and 10A). It is suitable. Therefore, the elastic member 10 engaged with the guide groove 114b is pulled by the anvil roll 210 rotating counterclockwise and bent at the bottom P1 of the guide groove 114b, and is tangent to the contact P2 on the outer peripheral surface of the anvil roll 210. It extends in the direction and is inserted into the groove 214 (see FIGS. 11 to 14) on the outer peripheral surface of the anvil roll 210 at the contact P2.
- the guide plate 112 has a length L1 (specifically, a guide) of the elastic member 10 located between the guide groove 114b and the groove 214 of the anvil roll 210. It is considered that the shorter the distance L1) from the bottom P1 of the groove 114b to the contact point P2 where the elastic member 10 contacts the anvil roll 210, the more difficult the elastic member 10 tends to come off from the groove 214 of the anvil roll 210.
- the present inventors have the length L1 of the elastic member 10 located between the guide groove 114b and the groove 214 of the anvil roll 210 (that is, the free distance L1 in which the elastic member 10 moves in the air without being restrained) and elasticity.
- Table 1 shows the correlation as shown in Table 1 below.
- a linear thread rubber having a diameter of 0.1 mm or more was used as the elastic member 10, and the thread rubber was continuously inserted from the guide groove 114b of the guide plate 112 into the groove 214 of the anvil roll 210 in the manufacturing apparatus 100.
- the frequency of contact with the rubber thread and the amount of runout were observed for a certain period of time.
- the experimental results are shown in Table 1 below.
- the free distance L1 is larger than 15 mm and is 15 to 30 mm or less, the probability that the rubber thread swings is 4.66%, which is within an acceptable probability (5%), so that the rubber thread vibrates. It can be seen that the inhibitory effect is a pass or a score (triangle).
- the free distance L1 is in a range larger than 30 mm, for example, 30 to 50 mm or less, the probability that the rubber thread swings becomes 10% or more, which greatly exceeds the allowable probability (5%). It turns out that it is a failure (x).
- the guide plate 112 of the present embodiment has the guide groove 114b and the groove of the anvil roll 210.
- the elastic member 10 located between the elastic member 10 and the elastic member 10 is arranged so that the length L1 is 30 mm or less (preferably 15 mm or less) (practically, the range is 1 to 30 mm, preferably 1 to 15 mm). It is preferable to have.
- the distance L1 is set so that the guide plate 112 does not come into contact with the anvil roll 210 (specifically, the sheet 2a wound around the outer peripheral surface of the anvil roll 210) (that is, the distance is equal to or greater than the thickness of the sheet 2a). ), It is set to be larger than 0.
- the guide plate 112 has a gap ⁇ 1 between the bottom P1 of the guide groove 114b and the outer peripheral surface of the convex portion 212 of the anvil roll 210 of 1 mm or less (preferably 0.3 mm or less) (practical use). Above, it is arranged so as to be in the range of 0.1 mm to 1 mm, preferably in the range of 0.1 mm to 0.3 mm).
- the bottom surface 114d facing the anvil roll 210 is 30 degrees or less with respect to the tangent line of the anvil roll 210 at the contact point P2 where the anvil roll 210 and the elastic member 10 are in contact with each other. It is arranged so as to form an angle ⁇ 1 (practically in the range of 1 to 30 degrees).
- the plurality of guide rolls 111 are arranged on the upstream side of the guide plate 112 in the transport direction of the elastic member 10, and guide the elastic member 10 to the guide groove 114b.
- On the outer peripheral surface of each guide roll 111 in order to guide the plurality of elastic members 10 to the plurality of guide grooves 114b, a plurality of grooves (not shown) separated from each other in the direction in which the rotation axis of the guide roll 111 extends. Has.
- the guide roll 111A located on the most downstream side of the plurality of guide rolls 111 is affected by rotation unevenness and rattling of the guide roll 111A (for example, sagging of the elastic member 10). ) Is not generated, so that the distance L2 until the elastic member 10 is separated from the guide roll 111 and inserted into the guide groove 114b is 50 mm or more.
- the nip roll 104 is arranged on the upstream side of the horn 220.
- the region where the elastic member 10 is inserted into the groove 214 of the anvil roll 210 that is, the first position of the outer peripheral surface of the anvil roll 210 where the elastic member 10 is inserted into the groove 214 (that is, the anvil roll 210 and the elastic member 10).
- the two sheets and the elastic member 10 are formed in cooperation with the anvil roll 210. It is possible to pinch.
- the transport distance L3 from when the elastic member 10 comes into contact with the groove 214 of the anvil roll 210 until when the pressure is narrowed by the horn 220 is set to 150 mm or less (practically in the range of 1 to 150 mm). There is.
- the optimum value of the transport distance L3 described above was derived by experiments by the present inventors. Specifically, as shown in Table 2 below, when a linear thread rubber having a diameter of 0.1 mm or more is used as the elastic member 10, the thread rubber comes into contact with the groove 214 of the anvil roll 210 and then the horn. The relationship between the transport distance L3 until the pressure was narrowed by 220 and the probability of the rubber thread swinging was investigated experimentally.
- the transport distance L3 it is preferable that the value is set to 150 mm or less.
- FIG. 15 is a schematic view showing a disposable diaper (wearing article) 20 in which the composite elastic member 1 is used as an example of use of the composite elastic member 1 configured as described above. Is.
- the disposable diaper 20 has a waist circumference 21 having an anterior abdomen 21a arranged on the front side of the wearer's abdomen, a back back 21b arranged on the buttocks side of the wearer, and an inseam arranged on the inseam of the wearer. 22 and.
- the composite telescopic member 1 of the present embodiment is used for the front abdomen 21a and the back back 21b.
- the composite elastic member 1 is applied to the front abdomen 21a and the back back 21b so that the elastic direction of the composite elastic member 1 coincides with the waist circumference direction (horizontal direction in FIG. 15) when worn.
- FIG. 16 is a diagram showing an example of a method for manufacturing the disposable diaper 20, and the present invention is not limited thereto.
- the manufacturing method shown in FIG. 16 is composed of stages 1 to 3.
- a pair of continuums 101 in which the composite telescopic members 1 are connected in the transport direction is prepared. That is, a continuum 101 for forming the anterior abdomen 21a and a continuum 101 for forming the posterior back 21b are prepared.
- the two continuums 101 are transported in the longitudinal direction of the continuums 101 in a state of being arranged parallel to each other, and the crotch portion 22 is provided so that the longitudinal direction thereof is orthogonal to the longitudinal direction of the continuums 101. Place it across 101.
- a plurality of crotch portions 22 are placed apart from each other in the transport direction.
- the crotch portion 22 and the continuous body 101 are joined to form the joined body 102 (joint body forming step).
- stage 2 a hole serving as a leg opening is opened between the adjacent inseam 22s. Then, the joined body 102 is folded in half so that the crotch portion 22 is inside, with the center line CL1 in the width direction (direction orthogonal to the longitudinal direction of the continuum 101) as a crease (folding step).
- the portions of the continuum 101 in which the portions located in the middle of the adjacent crotch portions 22 overlap are joined along the direction orthogonal to the longitudinal direction of the continuum 101 to form the side seal SS.
- the continuum 101 is cut along the cutting line K in the side sealing portion (cutting step).
- the waist circumference portion 21 (front abdomen portion 21a and back back portion 21b) is composed of the composite elastic member 1, and a disposable diaper 20 that expands and contracts in the waist circumference direction is manufactured.
- the step of opening the hole to be the leg opening may or may not be performed before joining the crotch portion 22 to the continuum 101.
- each elastic member 10 of the composite elastic member 1 may be adhered to two sheets 2a and 2b by a hot melt adhesive in the vicinity of a portion corresponding to the cutting line K. By doing so, it is possible to prevent the elastic members 10 from coming off due to cutting along the cutting line K.
- the elastic member guide device 110 guides the elastic member 10 to a plurality of grooves 214 on the outer peripheral surface of the anvil roll 210, as shown in FIGS. 6 to 10.
- a plate-shaped guide plate 112 is provided.
- the guide plate 112 is provided at the tip 114a closest to the outer peripheral surface of the anvil roll 210 and the tip 114a, and the anvil roll is in a state where a plurality of elastic members 10 are separated from each other in a direction parallel to the axis of the anvil roll 210.
- the guide plate 112 is arranged so that the length L1 (free distance L1) of the elastic member 10 located between the guide groove 114b and the groove 214 of the anvil roll 210 is 30 mm or less.
- the elastic member 10 is arranged. It is possible to reduce the problem that the elastic member 10 comes off from the groove 214 of the anvil roll 210 when the elastic member 10 is sent from the guide groove 114b to the groove 214 of the anvil roll 210, and as a result, the function of preventing the elastic member 10 from being cut is provided. It is possible to improve.
- the guide plate 112 is preferably arranged so that the length L1 of the elastic member 10 located between the guide groove 114b and the groove 214 of the anvil roll 210 is 15 mm or less. In that case, when the elastic member 10 is sent from the guide groove 114b to the groove 214 of the anvil roll 210, it becomes possible to further reduce the problem that the elastic member 10 comes off from the groove 214 of the anvil roll 210, and as a result, the elasticity It is possible to further improve the cutting prevention function of the member 10.
- the guide plate 112 has a gap ⁇ 1 of 1 mm or less (preferably 0.3 mm or less) between the bottom P1 of the guide groove 114b and the outer peripheral surface of the convex portion 212 of the anvil roll 210. It is arranged so that it becomes.
- the guide groove 114b can be brought closer to the outer peripheral surface of the convex portion of the anvil roll 210, and the distance L1 until the elastic member 10 leaves the guide groove 114b and is inserted into the groove 214 of the anvil roll 210 is shortened. Is possible. This makes it possible to further reduce the problem that the elastic member 10 comes off from the groove 214 of the anvil roll 210, and as a result, it is possible to further improve the cutting prevention function of the elastic member 10.
- the guide member that guides the plurality of elastic members 10 to the outer peripheral surface of the anvil roll 210 in a state of being separated from each other in the direction parallel to the axis of the anvil roll 210 is plate-shaped. It is composed of a guide plate 112 of.
- the tip 114a of the guide plate 112 is the edge closest to the outer peripheral surface of the anvil roll 210 in the guide plate 112, and has a tapered shape.
- the plurality of guide grooves 114b are formed at the tapered tip 114a.
- the guide plate 112 is anviled without interfering with the anvil roll 210 and the sheets 2a and 2b wound around the outer peripheral surface of the anvil roll 210. It is possible to arrange the roll 210 close to the outer peripheral surface. As a result, the distance L1 between the guide groove 114b and the groove 214 of the anvil roll 210 can be shortened, and the problem that the elastic member 10 comes off from the groove 214 of the anvil roll 210 can be further reduced. Further, since the guide groove 114b is formed at the tapered tip 114a, it is possible to reduce the frictional resistance with the guide plate 112 when the elastic member 10 passes through the guide groove 114b. As a result, it is possible to further improve the cutting prevention function of the elastic member 10.
- the tip 114a of the guide plate 112 is in the rotation direction of the anvil roll 210 (counterclockwise in FIG. 10) with respect to the contact P2 in contact with the elastic member 10 on the outer peripheral surface of the anvil roll 210.
- the guide plate 112 is arranged so that the bottom surface 114d facing the anvil roll 210 forms an angle ⁇ 1 of 30 degrees or less with respect to the tangent line of the anvil roll 210 at the contact point P2 where the anvil roll 210 and the elastic member 10 are in contact with each other. There is.
- the bottom of the guide groove 114b can be brought closer to the outer peripheral surface of the anvil roll 210, and the distance L1 until the elastic member 10 leaves the guide groove 114b and is inserted into the groove 214 of the anvil roll 210 can be shortened. It is possible. This makes it possible to further reduce the problem that the elastic member 10 comes off from the groove 214 of the anvil roll 210, and as a result, it is possible to further improve the cutting prevention function of the elastic member 10.
- the composite telescopic member manufacturing apparatus 100 of the present embodiment is arranged on the upstream side of the horn 220 in the transport direction of the sheets 2a and 2b (the rotation direction of the anvil roll 210), and the elastic member 10 is inserted into the groove 214 of the anvil roll 210. From the contact area P2 (see FIG. 10B), which is the first position where the elastic member 10 is inserted into the groove 214 on the outer peripheral surface of the anvil roll 210 (that is, the output unit 221 of the horn 220 (FIG. 10). In the section up to (a))), a nip roll 104 that sandwiches the two sheets and the elastic member 10 in cooperation with the anvil roll 210 is further provided.
- the elastic member guide device 110 is arranged on the upstream side of the guide plate 112 in the transport direction of the elastic member 10, and the guide roll 111 guides the elastic member 10 to the guide groove 114b. Is further equipped. In this configuration, the elastic member 10 can be reliably guided to the guide groove 114b, and it is possible to prevent the elastic member 10 from coming off the guide groove 114b.
- the elastic member 10 of the guide roll 111 (specifically, the guide roll 111A located on the most downstream side of the plurality of guide rolls 111) is separated from the guide roll 111. It is arranged so that the distance L2 until it is inserted into the guide groove 114b is 50 mm or more. With this configuration, it is possible to eliminate the influence on the elastic member 10 due to uneven rotation and rattling of the guide roll 111, for example, slack of the elastic member 10.
- the transport distance L3 from when the elastic member 10 comes into contact with the groove 214 of the anvil roll 210 until when the pressure is narrowed by the horn 220 is 150 mm or less.
- the vibration suppressing effect of the elastic member 10 is sufficiently exerted as shown in Table 2 above. Therefore, the elastic member 10 is said to be narrowed from the contact with the groove 214 of the anvil roll 210 until the pressure is narrowed by the horn 220. It is possible to reduce the problem that the elastic member 10 comes off from the groove 214 of the anvil roll 210, and as a result, it is possible to further improve the cutting prevention function of the elastic member 10.
- a plate-shaped guide plate 112 In this embodiment, as an example of a guide member that guides a plurality of elastic members 10 to the outer peripheral surface of the anvil roll 210 in a state of being separated from each other in a direction parallel to the axis of the anvil roll 210, a plate-shaped guide plate 112
- the present invention is not limited to this.
- a guide roller or the like having a plurality of guide grooves on the outer peripheral surface may be used as another guide member, and the plurality of elastic members 10 may be formed by the guide roller. It is possible to guide the anvil roll 210 to a plurality of grooves 214 on the outer peripheral surface of the anvil roll 210 in a state of being separated from each other in a direction parallel to the axis of the anvil roll 210. Also in this case, by arranging the guide rollers so that the distance L1 until the elastic member 10 is separated from the guide groove 114b and inserted into the groove 214 of the anvil roll 210 is 30 mm or less, the elastic member 10 is separated from the guide groove.
- the joining device is a device that performs ultrasonic welding, and ultrasonic vibration is applied to the sheets 2a and 2b to generate frictional heat, thereby heating the sheets 2a and 2b.
- the specific configuration for heating and welding these sheets 2a and 2b is not limited to this.
- a joining device a device for heating and welding the sheets 2a and 2b without vibrating is used, and in the joining step, these sheets 2a and 2b are formed like a so-called heat seal. May be heated and welded without vibrating.
- the guide plate 112 is fixed to the fixing member 113 fixed to the end plate or the like inside the apparatus so as not to move by screwing or the like.
- the present invention is not limited to this.
- the guide plate 112 can be moved between a position close to the anvil roll 210 (conveyor roller) shown in FIG. 17 and a position away from the anvil roll 210 shown in FIG. It may be configured.
- the elastic member guide device 110 shown in FIGS. 17 to 18 includes a holding member 115 that holds both the guide roll 111 and the guide plate 112 in addition to the plurality of guide rolls 111 and guide plate 112 described above.
- a support shaft 116 that swingably supports the holding member 115 in the vertical direction and a supply roll 117 arranged on the upstream side of the guide roll 111 in the transport direction of the elastic member 10 are provided.
- the rotating shafts of the support shaft 116 and the supply roll 117 are fixed so as not to move in predetermined positions inside the manufacturing apparatus 100.
- a groove for guiding the elastic member 10 is formed on the outer peripheral surface of each of the plurality of guide rolls 111 and the supply roll 117.
- the guide plate 112 is shown in FIG. 17 because the holding member 115 holding the guide roll 111 and the guide plate 112 swings in the vertical direction with the support shaft 116 as the center of rotation. It is possible to move between a position close to the anvil roll 210 (conveyor roller) and a position away from the anvil roll 210 shown in FIG.
- the guide plate 112 when the guide plate 112 is at a position away from the anvil roll 210 (the position when the elastic member 10 (thread rubber or the like) is passed through), the guide plate 112 moves upward of the elastic member 10. Since it is retracted, the work of setting the elastic member 10 on the guide device 110 (specifically, the work of hanging over the groove of the guide roll 111A on the most downstream side of the plurality of guide rolls 111 and the outer circumference of the anvil roll 210). Can be easily performed.
- the elastic member 10 After setting the elastic member 10 in the guide device 110, when the guide plate 112 shown in FIG. 17 is returned to a position close to the anvil roll 210, the elastic member 10 is set to the groove 114b of the guide plate 112 (FIG. 10 (FIG. 10). b) Inserted into) and hung in each groove of the plurality of guide rolls 111, the guide device 110 can return to the state shown in FIG.
- the embodiments are summarized below.
- the two sheets are conveyed to each other and the sheets and a plurality of elastic members are joined to each other while conveying the two sheets along the longitudinal direction thereof, and the two sheets are joined to each other.
- a device for manufacturing a composite elastic member having a plurality of elastic members sandwiched between the two sheets, and the elastic members are placed between the two sheets being conveyed.
- the two sheets and the guide device for guiding each elastic member to the joining device are provided, and the joining device has the two sheets sandwiched between the elastic members and the length of the sheets.
- a pressure device for sandwiching the sheet is provided, and heat is applied to the sheet between the transfer roller and the pressure device.
- the outer peripheral surface of the transfer roller has a diameter of the outer peripheral surface.
- At least one convex portion protruding outward in the direction is formed, and the convex portion has a plurality of grooves extending in the transport direction of the transport roller and separated in a direction parallel to the axis, and the guide device , The tip closest to the outer peripheral surface of the transport roller, and the tip provided at the tip, parallel to the shaft of the transport roller so as to guide the plurality of elastic members to the plurality of grooves of the transport roller, respectively.
- the guide member includes the plurality of guide grooves for holding the plurality of elastic members in a state of being separated from each other in the direction, and the guide member is located between the guide groove and the groove of the transport roller. It is characterized in that it is arranged so that the length of the elastic member is 30 mm or less.
- the present inventors have diligently studied the elastic member between the guide groove of the guide member and the groove of the transport roller. We have found that if the distance that the elastic member moves in the air, that is, the free distance of the elastic member is reduced to a predetermined distance or less, the elastic member can be reliably guided to the groove of the transport roller and can be prevented from falling out of the groove. Created the manufacturing equipment of.
- the elastic member is conveyed from the guide groove by arranging the guide member so that the length of the elastic member located between the guide groove and the groove of the transfer roller is 30 mm or less. It is possible to reduce the problem that the elastic member comes off from the groove of the transport roller when it is sent to the groove of the roller, and as a result, it is possible to improve the cutting prevention function of the elastic member.
- the guide member is arranged so that the length of the elastic member located between the guide groove and the groove of the transport roller is 15 mm or less. Is preferable.
- the elastic member is fed from the guide groove to the groove of the transfer roller by arranging the guide member so that the length of the elastic member located between the guide groove and the groove of the transfer roller is 15 mm or less. At that time, it is possible to further reduce the problem that the elastic member comes off from the groove of the transport roller, and as a result, it is possible to further improve the cutting prevention function of the elastic member.
- the guide member is preferably arranged so that the shortest distance between the bottom of the guide groove and the outer peripheral surface of the convex portion of the transport roller is 1 mm or less. ..
- the guide groove can be brought closer to the outer peripheral surface of the convex portion of the transfer roller, and the distance until the elastic member leaves the guide groove and is inserted into the groove of the transfer roller can be shortened.
- the guide member is formed in a plate shape, and the tip thereof is an edge closest to the outer peripheral surface of the transport roller in the plate-shaped guide member, and is tapered. It has a shape, and it is preferable that the plurality of guide grooves are formed at the tapered tip.
- the guide member is arranged close to the outer peripheral surface of the transfer roller without interfering with the transfer roller and the sheet wound around the outer peripheral surface of the transfer roller. It is possible to do. As a result, the distance between the guide groove and the groove of the transfer roller can be shortened, and the problem that the elastic member comes off from the groove of the transfer roller can be further reduced. Further, since the guide groove is formed at the tapered tip, it is possible to reduce the frictional resistance with the guide member when the elastic member passes through the guide groove. As a result, it is possible to further improve the cutting prevention function of the elastic member.
- the tip of the guide member is arranged on the upstream side in the rotation direction of the transport roller with respect to the contact point in contact with the elastic member on the outer peripheral surface of the transport roller, and the upstream side. It is preferable that the guide plate is arranged so as to face the side and the surface facing the transport roller is at an angle of 30 degrees or less with respect to the tangent line of the transport roller at the contact point.
- the bottom of the guide groove can be brought closer to the outer peripheral surface of the transfer roller, and the distance until the elastic member leaves the guide groove and is inserted into the groove of the transfer roller can be shortened.
- the distance until the elastic member leaves the guide groove and is inserted into the groove of the transfer roller can be shortened.
- the elastic member is arranged on the upstream side of the pressing device in the conveying direction of the sheet, and cooperates with the conveying roller in a region where the elastic member is inserted into the groove of the conveying roller. It is preferable that the two sheets and the nip roll for sandwiching the elastic member are further provided.
- the device is further provided with a guide roll that is arranged on the upstream side of the guide member in the transport direction of the elastic member and guides the elastic member to the guide groove.
- the guide roll is preferably arranged so that the distance from the elastic member to the guide roll and the insertion into the guide groove is 50 mm or more.
- the transport distance from the time when the elastic member comes into contact with the groove of the transport roller until the pressure is narrowed by the narrowing device is preferably 150 mm or less.
- the guide member can move between a position close to the transfer roller and a position away from the transfer roller.
- the composite telescopic member manufacturing apparatus of the present embodiment it is possible to reduce the problem that the elastic member comes off from the groove of the transport roller and improve the cutting prevention function.
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Abstract
Description
図1は、本発明の実施形態に係る製造装置によって製造された複合伸縮部材の平面図である。図2は、図1のII-II線断面図の一部である。
次に、前記複合伸縮部材1を製造するための製造装置について説明する。
図15は、前記のように構成された複合伸縮部材1の使用例として、この複合伸縮部材1が用いられた使い捨ておむつ(着用物品)20を示した概略図である。
(1)
本実施形態の複合伸縮部材の製造装置100では、弾性部材案内装置110は、図6~10に示されるように、弾性部材10をアンビルロール210の外周面の複数の溝214に案内するガイド部材として、板状のガイドプレート112を備える。ガイドプレート112は、アンビルロール210の外周面に最も近接する先端114aと、当該先端114aに設けられ、複数の弾性部材10をアンビルロール210の軸と平行な方向に互いに離間した状態で当該アンビルロール210の外周面の複数の溝214に案内するように、アンビルロール210の軸と平行な方向に互いに離間した状態で前記複数の弾性部材10を保持する複数のガイド溝114bとを有する。ガイドプレート112は、ガイド溝114bとアンビルロール210の溝214との間に位置する弾性部材10の長さL1(自由距離L1)が30mm以下になるように、配置されている。
ガイドプレート112は、ガイド溝114bとアンビルロール210の溝214との間に位置する弾性部材10の長さL1が15mm以下になるように、配置されているのが好ましい。その場合、弾性部材10がガイド溝114bからアンビルロール210の溝214へ送られる際に、弾性部材10がアンビルロール210の溝214から外れる不具合をさらに低減することが可能になり、その結果、弾性部材10の切断防止機能をさらに向上することが可能である。
本実施形態の複合伸縮部材の製造装置100では、ガイドプレート112は、ガイド溝114bの底P1とアンビルロール210の凸部212の外周面との隙間δ1が1mm以下(好ましくは0.3mm以下)になるように、配置されている。この構成では、ガイド溝114bをアンビルロール210の凸部の外周面に近づけることができ、弾性部材10がガイド溝114bを離れてアンビルロール210の溝214に挿入するまでの距離L1を短縮することが可能である。これにより、弾性部材10がアンビルロール210の溝214から外れる不具合をさらに低減することが可能になり、その結果、弾性部材10の切断防止機能をさらに向上することが可能である。
本実施形態の複合伸縮部材の製造装置100では、複数の弾性部材10をアンビルロール210の軸と平行な方向に互いに離間した状態で当該アンビルロール210の外周面に案内するガイド部材が、板状のガイドプレート112によって構成されている。ガイドプレート112の先端114aは、ガイドプレート112におけるアンビルロール210の外周面に最も近接する縁であり、しかも、先細りの形状をしている。複数のガイド溝114bは、先細りになった先端114aに形成されている。この構成では、先端114aが先細りになった板状のガイドプレート112を用いることによって、当該ガイドプレート112をアンビルロール210および当該アンビルロール210外周面に巻かれるシート2a、2bに干渉することなくアンビルロール210の外周面に近づけて配置することが可能である。これにより、ガイド溝114bとアンビルロール210の溝214との距離L1を短縮し、弾性部材10がアンビルロール210の溝214から外れる不具合をさらに低減することが可能になる。また、ガイド溝114bが先細りになった先端114aに形成されているので、弾性部材10がガイド溝114bを通過する際のガイドプレート112との摩擦抵抗を減少することも可能である。その結果、弾性部材10の切断防止機能をさらに向上することが可能である。
本実施形態の複合伸縮部材の製造装置100では、ガイドプレート112の先端114aは、アンビルロール210の外周面における弾性部材10と接する接点P2よりもアンビルロール210の回転方向(図10では反時計方向)における上流側(図10の右側)に配置され、かつ、当該上流側を向いている。ガイドプレート112は、アンビルロール210に対向する底面114dがアンビルロール210と弾性部材10とが接する接点P2における当該アンビルロール210の接線に対して30度以下の角度θ1をなすように、配置されている。
本実施形態の複合伸縮部材の製造装置100は、シート2a、2bの搬送方向(アンビルロール210の回転方向)においてホーン220の上流側に配置され、弾性部材10がアンビルロール210の溝214に挿入されている領域(すなわち、アンビルロール210の外周面のうち弾性部材10が溝214に挿入された最初の位置である接点P2(図10(b)参照)からホーン220の出力部221(図10(a)参照)までの区間)においてアンビルロール210と協働して2枚のシートおよび弾性部材10を挟むニップロール104をさらに備えている。
本実施形態の複合伸縮部材の製造装置100では、弾性部材案内装置110は、弾性部材10の搬送方向においてガイドプレート112の上流側に配置され、弾性部材10をガイド溝114bに案内する案内ロール111をさらに備えている。この構成では、弾性部材10をガイド溝114bへ確実に案内することが可能であり、弾性部材10がガイド溝114bから外れる不具合を防ぐことが可能である。
本実施形態の複合伸縮部材の製造装置100では、案内ロール111(具体的には、複数の案内ロール111のうち最も下流側に位置する案内ロール111A)は、弾性部材10が案内ロール111から離れてガイド溝114bに挿入するまでの距離L2が50mm以上になるように、配置されている。この構成では、案内ロール111の回転ムラおよびガタツキなどによる弾性部材10への影響、例えば弾性部材10のたるみなどを無くすことが可能である。
本実施形態の複合伸縮部材の製造装置100では、弾性部材10がアンビルロール210の溝214に接してからホーン220により狭圧されるまでの搬送距離L3は、150mm以下である。この構成では、上記表2のように弾性部材10の振動抑制効果が十分発揮されるので、弾性部材10がアンビルロール210の溝214に接してからホーン220により狭圧されるまでの間に当該弾性部材10がアンビルロール210の溝214から外れる不具合を低減することが可能になり、その結果、弾性部材10の切断防止機能をさらに向上することが可能である。
(A)
なお、本実施形態は、複数の弾性部材10をアンビルロール210の軸と平行な方向に互いに離間した状態で当該アンビルロール210の外周面に案内するガイド部材の一例として、板状のガイドプレート112を例に挙げて説明したが、本発明はこれに限定されない。
また、前記実施形態では、接合装置が、超音波溶着を行う装置であって、シート2a,2bに超音波振動を付与して摩擦熱を発生させ、これによりシート2a、2bを加熱する場合について説明したが、これらシート2a,2bを加熱して溶着させる具体的構成はこれに限らない。本発明の他の変形例として、例えば、接合装置として、シート2a,2bを振動させずに加熱して溶着させる装置を用い、前記接合工程において、いわゆるヒートシールのように、これらシート2a,2bを振動させずに加熱して溶着させてもよい。
上記実施形態では、ガイドプレート112は、図10(a)、(b)に示されるように、装置内部の鏡板などに固定された固定部材113にネジ止めなどによって動かないように固定されているが、本発明はこれに限定されるものではない。
前記実施形態をまとめると以下のとおりである。
前記実施形態にかかる複合伸縮部材の製造装置は、2枚のシートをその長手方向に沿って搬送しながらこれらシートどうしおよびこれらシートと複数の弾性部材とを互いに接合して、前記2枚のシートと当該2枚のシートの間に挟みこまれた複数の弾性部材とを有する複合伸縮部材を製造するための装置であって、前記搬送されている2枚のシートの間に前記各弾性部材を挟み込んだ状態で、前記各弾性部材と前記シート、および、前記2枚のシートどうしを溶着させて接合する接合装置と、前記各弾性部材がその長手方向に延びるとともに2枚のシートの間に挟まれるように、これら2枚のシートおよび前記各弾性部材を前記接合装置に案内する案内装置とを備え、前記接合装置は、前記各弾性部材が挟み込まれた前記2枚のシートをこれらシートの長手方向に搬送する外周面を有し、所定の軸の回りを回転する搬送ローラと、当該搬送ローラの外周面と対向して当該外周面との間で前記各弾性部材が挟み込まれた前記2枚のシートを挟圧する挟圧装置とを備え、これら搬送ローラと挟圧装置との間で前記シートに熱を加えるように構成されており、前記搬送ローラの外周面には、当該外周面の径方向外側に突出する少なくとも1つの凸部が形成されており、前記凸部は、前記搬送ローラの搬送方向に延びるとともに前記軸と平行な方向に離間する複数の溝を有し、前記案内装置は、前記搬送ローラの外周面に最も近接する先端と、当該先端に設けられ、前記複数の弾性部材を前記搬送ローラの前記複数の溝にそれぞれ案内するように、前記搬送ローラの前記軸と平行な方向に互いに離間した状態で前記複数の弾性部材を保持する前記複数のガイド溝とを有するガイド部材を備え、前記ガイド部材は、前記ガイド溝と前記搬送ローラの前記溝との間に位置する前記弾性部材の長さが30mm以下になるように、配置されていることを特徴とする。
Claims (10)
- 2枚のシートをその長手方向に沿って搬送しながらこれらシートどうしおよびこれらシートと複数の弾性部材とを互いに接合して、前記2枚のシートと当該2枚のシートの間に挟みこまれた複数の弾性部材とを有する複合伸縮部材を製造するための装置であって、
前記搬送されている2枚のシートの間に前記各弾性部材を挟み込んだ状態で、前記各弾性部材と前記シート、および、前記2枚のシートどうしを溶着させて接合する接合装置と、
前記各弾性部材がその長手方向に延びるとともに2枚のシートの間に挟まれるように、これら2枚のシートおよび前記各弾性部材を前記接合装置に案内する案内装置とを備え、
前記接合装置は、前記各弾性部材が挟み込まれた前記2枚のシートをこれらシートの長手方向に搬送する外周面を有し、所定の軸の回りを回転する搬送ローラと、当該搬送ローラの外周面と対向して当該外周面との間で前記各弾性部材が挟み込まれた前記2枚のシートを挟圧する挟圧装置とを備え、これら搬送ローラと挟圧装置との間で前記シートに熱を加えるように構成されており、
前記搬送ローラの外周面には、当該外周面の径方向外側に突出する少なくとも1つの凸部が形成されており、
前記凸部は、前記搬送ローラの搬送方向に延びるとともに前記軸と平行な方向に離間する複数の溝を有し、
前記案内装置は、前記搬送ローラの外周面に最も近接する先端と、当該先端に設けられ、前記複数の弾性部材を前記搬送ローラの前記複数の溝にそれぞれ案内するように、前記搬送ローラの前記軸と平行な方向に互いに離間した状態で前記複数の弾性部材を保持する前記複数のガイド溝とを有するガイド部材を備え、
前記ガイド部材は、前記ガイド溝と前記搬送ローラの前記溝との間に位置する前記弾性部材の長さが30mm以下になるように、配置されている、
ことを特徴とする複合伸縮部材の製造装置。 - 請求項1に記載の複合伸縮部材の製造装置であって、
前記ガイド部材は、前記ガイド溝と前記搬送ローラの前記溝との間に位置する前記弾性部材の長さが15mm以下になるように、配置されている、
ことを特徴とする複合伸縮部材の製造装置。 - 請求項1または2に記載の複合伸縮部材の製造装置であって、
前記ガイド部材は、前記ガイド溝の底と前記搬送ローラの前記凸部の外周面との最短距離が1mm以下になるように、配置されている、
ことを特徴とする複合伸縮部材の製造装置。 - 請求項1~3のいずれか1項に記載の複合伸縮部材の製造装置であって、
前記ガイド部材は、板状に形成され、
前記先端は、板状の前記ガイド部材における前記搬送ローラの外周面に最も近接する縁であり、しかも、先細りの形状をしており、
前記複数のガイド溝は、先細りになった前記先端に形成されている、
ことを特徴とする複合伸縮部材の製造装置。 - 請求項4に記載の複合伸縮部材の製造装置であって、
前記ガイド部材の前記先端は、前記搬送ローラの外周面における前記弾性部材と接する接点よりも前記搬送ローラの回転方向における上流側に配置され、かつ、当該上流側を向いており、
前記ガイドプレートは、前記搬送ローラに対向する面が前記接点における当該搬送ローラの接線に対して30度以下の角度をなすように、配置されている、
ことを特徴とする複合伸縮部材の製造装置。 - 請求項1~5のいずれか1項に記載の複合伸縮部材の製造装置であって、
前記シートの搬送方向において前記挟圧装置の上流側に配置され、前記弾性部材が前記搬送ローラの前記溝に挿入されている領域において前記搬送ローラと協働して前記2枚のシートおよび前記弾性部材を挟むニップロールをさらに備えている、
ことを特徴とする複合伸縮部材の製造装置。 - 請求項1~6のいずれか1項に記載の複合伸縮部材の製造装置であって、
前記弾性部材の搬送方向において前記ガイド部材の上流側に配置され、前記弾性部材を前記ガイド溝に案内する案内ロールをさらに備えている、
ことを特徴とする複合伸縮部材の製造装置。 - 請求項7に記載の複合伸縮部材の製造装置であって、
前記案内ロールは、前記弾性部材が前記案内ロールから離れて前記ガイド溝に挿入するまでの距離が50mm以上になるように、配置されている、
ことを特徴とする複合伸縮部材の製造装置。 - 請求項1~8のいずれか1項に記載の複合伸縮部材の製造装置であって、
前記ガイド部材は、前記搬送ローラの前記溝に接してから前記狭圧装置により狭圧されるまでの搬送距離は、150mm以下である、
ことを特徴とする複合伸縮部材の製造装置。 - 請求項1~9のいずれか1項に記載の複合伸縮部材の製造装置であって、
前記ガイド部材は、前記搬送ローラに近接する位置と前記搬送ローラから離間した位置との間を移動可能である、
ことを特徴とする複合伸縮部材の製造装置。
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