WO2015166672A1 - Procédé de production d'une feuille composite pour article absorbant, et dispositif de fabrication - Google Patents

Procédé de production d'une feuille composite pour article absorbant, et dispositif de fabrication Download PDF

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Publication number
WO2015166672A1
WO2015166672A1 PCT/JP2015/051386 JP2015051386W WO2015166672A1 WO 2015166672 A1 WO2015166672 A1 WO 2015166672A1 JP 2015051386 W JP2015051386 W JP 2015051386W WO 2015166672 A1 WO2015166672 A1 WO 2015166672A1
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Prior art keywords
sheet
low
stretchable
portions
composite sheet
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PCT/JP2015/051386
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English (en)
Japanese (ja)
Inventor
山本　広喜
美彦 松本
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ユニ・チャーム株式会社
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Publication of WO2015166672A1 publication Critical patent/WO2015166672A1/fr

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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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers

Definitions

  • the present invention relates to a method for manufacturing a composite sheet and an apparatus for manufacturing an absorbent article such as a disposable diaper.
  • a composite sheet is generated by stacking and fixing a low stretch sheet on a stretch sheet that is transported in a stretched state at a predetermined stretch ratio in the transport direction. Has been done. And in such a composite sheet, it is normally conveyed to the lower process while maintaining the above-mentioned stretched state, and in the lower process, an absorbent main body that absorbs liquid is applied to the stretched composite sheet. Appropriate processing such as attachment is sequentially performed, and finally the product is divided into diaper units to produce the diaper.
  • the manufactured diaper is provided to the market in a contracted form so that it can be extended at least until the heel is fully extended.
  • a user such as a wearer can use a diaper having specifications that can be expanded and contracted.
  • the present invention has been made in view of the above-described conventional problems, and an object thereof is to form a beautiful wrinkle on a composite sheet according to an absorbent article.
  • the main invention for achieving the above object is: A method for producing a composite sheet having an elastic sheet according to an absorbent article and a low-extensible sheet having a lower extensibility than the elastic sheet, Preparing the low stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction; Fixing the stretchable sheet to the low stretchable sheet through a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet extended in the stretchable direction, In the fixing, the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and adjacent to the stretch direction among the plurality of joint portions.
  • the non-joint portion located between the mating joint portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. It is a manufacturing method of the composite sheet concerning an absorptive article characterized by providing the above-mentioned joined part.
  • An apparatus for producing a composite sheet having a stretchable sheet according to an absorbent article and a low stretchable sheet having a lower stretchability than the stretchable sheet An apparatus for preparing the low-stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction; An apparatus for fixing the stretchable sheet to the low stretchable sheet via a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet stretched in the stretchable direction;
  • the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and are adjacent to the stretch direction among the plurality of joint portions.
  • the non-joining portion located between the joining portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively.
  • FIG. 1A is a schematic perspective view of a pant-type diaper 1 as an example of an absorbent article according to the present embodiment
  • FIG. 1B is a schematic plan view of the unfolded diaper 1 viewed from the skin side. It is a schematic perspective view which decomposes
  • FIG. 4A is a schematic side view of the production line LM for manufacturing the diaper 1
  • FIG. 4B is a schematic plan view showing how the diaper 1 is manufactured.
  • 3 is a schematic side view of an exterior sheet generation processing unit 10.
  • FIG. 1A is a schematic perspective view of a pant-type diaper 1 as an example of an absorbent article according to the present embodiment
  • FIG. 1B is a schematic plan view of the unfolded diaper 1 viewed from the skin side. It is
  • FIG. 7 is a view taken along arrow VII-VII in FIG. 6. It is an enlarged view which expands and shows the outer peripheral surface of the anvil roller 17a in the rotation direction.
  • FIG. It is a schematic side view of the structure by which the heat-sealing apparatus or the crimping apparatus was provided instead of the ultrasonic welding apparatus 17 of the exterior sheet production
  • FIG. It is explanatory drawing of other embodiment, Comprising: It is a perspective image figure which shows the mode of the process at the time of making the expansion-contraction direction of the elastic sheet 8a follow a CD direction.
  • FIG. 11A is a schematic front view of the roll mechanism 13 ′ according to the other embodiment as viewed from the downstream side in the MD direction, and FIG. 11B is a view taken along the line BB in FIG. 11A.
  • FIG. 10 is a schematic side view of a modification 30 ′ of the exterior sheet shrinkage processing unit 30.
  • the non-joint portion located between the mating joint portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively. It is a manufacturing method of the composite sheet concerning an absorptive article characterized by providing the above-mentioned joined part.
  • a low-extensible sheet having the first part and the second part is prepared.
  • the sheet has an extension amount of the first part and an extension amount of the second part.
  • the low stretch sheet is likely to buckle in the predetermined direction based on the rigidity difference.
  • the stretchable sheet in a stretched state is fixed to the low stretchable sheet.
  • the stretchable sheet is stretched in the stretchable direction. Shrink in the predetermined direction.
  • the contractive force in the predetermined direction is applied from the stretchable sheet to the low-extensible sheet via the joint portion of both sheets, and the contractive force is low extensibility as an external force of compression along the predetermined direction. Acts on the sheet. Therefore, the low-extensible sheet buckles based on the above-described rigidity difference and becomes wrinkled.
  • the difference in rigidity is generated based on both the first portion and the second portion.
  • the central position of the first portion and the central position of the second portion are at least One by one is included in the non-joined part.
  • the non-joined portion in the low-extensible sheet can be quickly buckled, and as a result, the non-joined portion is quickly wrinkled. From the above, it is possible to form beautiful wrinkles on the composite sheet.
  • a method for producing a composite sheet according to such an absorbent article In the preparation, preparing the low-extensible sheet formed such that a plurality of the second portions are arranged at a predetermined formation pitch along the predetermined direction, In the fixing, it is desirable to provide the joining portion so that the length of the non-joining portion in the expansion / contraction direction is larger than the formation pitch.
  • the length of the non-joined portion is larger than the above-described formation pitch in which the second portions are arranged along the predetermined direction. Therefore, at least one of the center position of the first part and the center position of the two parts can be included in the non-joined part, whereby the non-joined part in the low-extensible sheet is quickly wrinkled. Come closer.
  • the joint portion is provided so that a plurality of center positions in the predetermined direction of the first portion and a center position in the predetermined direction of the second portion are included in the non-joint portion.
  • the non-joined portion includes a plurality of center positions of the first portion and a plurality of center positions of the second portion. Therefore, in such a non-joined portion, a difference in rigidity occurs at a plurality of positions in the predetermined direction. Therefore, the non-joined portion in the low stretch sheet can be buckled quickly at the plurality of positions, and as a result, the non-joined portion. There will be more traps.
  • a method for producing such a composite sheet In the preparation, preparing the low-extensible sheet formed such that a plurality of the second portions are arranged at a predetermined formation pitch along the predetermined direction, In the fixing, it is desirable to provide the joining portion so that the length of the non-joining portion in the expansion / contraction direction is larger than the multiple of the formation pitch.
  • the length of the non-joined part is made larger than the integral multiple of the formation pitch of the second part. Therefore, the non-joining portion can include a plurality of the center positions of the first portion and the center portion of the second portion, respectively, so that more non-joining portions in the low stretch sheet can be included. ⁇ comes to approach.
  • the low extensibility sheet is a continuous sheet continuous in the predetermined direction
  • the low-extensible sheet is conveyed with the predetermined direction as the conveying direction, and the first and second portions are formed on the low-extensible sheet being conveyed, It is desirable that the low-extensible sheet on which the first part and the second part are formed is conveyed toward a position where the fixing is performed without winding.
  • the first part and the second part are formed on the low-extension sheet in preparation. Therefore, even a low-extensible sheet having specifications that do not have the first part and the second part from the beginning can be used as a material for the composite sheet. Further, after the first and second portions are formed, the low-extensible sheet is not taken up, and the sheet is conveyed as it is to the position where the fixing is performed. Therefore, it is possible to effectively prevent crushing the bulk of the low stretch sheet that has been increased with the formation of the first and second portions by winding, and as a result, the low stretch sheet is bulky. It can be finished into a sheet having a softness of origin.
  • the low extensibility sheet is a continuous sheet continuous in the predetermined direction
  • the stretchable sheet is a continuous sheet continuous in the stretch direction
  • the stretchable sheet is transported with the stretch direction as the transport direction,
  • the stretchable sheet to which the low stretchable sheet is fixed passes through the predetermined position in the transport direction after the fixing, the portions of the stretchable sheet that pass through the predetermined position are sequentially It is desirable to contract in the expansion / contraction direction.
  • the predetermined sheet of the elastic sheet is used.
  • the portion passing through the position is contracted in the expansion / contraction direction sequentially. Therefore, when the first portion and the second portion of the low-extension sheet pass through the predetermined position, wrinkles are sequentially formed on the sheet, and as a result, neat wrinkles are formed neatly on the composite sheet. be able to.
  • a method for producing a composite sheet according to such an absorbent article In the preparation, the first portion and the second portion are formed on the low stretch sheet while a portion that is not stretched in the predetermined direction is generated at a predetermined position in a direction intersecting the predetermined direction. It is desirable to form.
  • the first part and the second part when forming the first portion and the second portion side by side in a predetermined direction with respect to the low-extension sheet, A portion that does not extend in the predetermined direction is formed at the predetermined position. And the stretchability does not express in the part which is not extended
  • the low extensibility sheet is a continuous sheet continuous in the predetermined direction, Forming the first part and the second part by passing the low extensible sheet between a pair of rolls rotating along the conveying direction while facing each other's outer peripheral surfaces;
  • the pair of rolls are corrugated rolls in which crests and troughs are alternately formed on each outer circumferential surface along the rotation direction, and the crests of the pair of rolls are such that the crests of each other are the troughs.
  • Rotate by meshing to enter the part It is desirable that the peak portion of at least one of the pair of rolls is discontinuously provided in a direction along the rotation axis of the roll.
  • the first portion and the second portion can be formed by passing a low stretch sheet continuous in a predetermined direction between a pair of rolls. . Therefore, a 1st part and a 2nd part can be efficiently formed with respect to the said low extensible sheet
  • a method for producing a composite sheet according to such an absorbent article It is desirable that the peak portion of the other roll of the pair of rolls is provided continuously in a direction along the rotation axis of the roll.
  • a method for producing a composite sheet according to such an absorbent article In the fixing, the stretchable sheet and the low stretchable sheet are stacked in the thickness direction with the stretchable sheet and the low stretchable sheet overlapped with each other in the thickness direction.
  • a pressure member By sandwiching with a pressure member, the joint is formed,
  • One clamping member of the pair of clamping members has a plurality of protrusions in a pattern in which the plurality of joints are formed on a surface facing the low-extensible sheet, and the other clamping pressure It is desirable that the member has a surface portion that is larger than the top surface so as to receive the top surface of the protrusion on the surface facing the stretchable sheet.
  • the protrusion is provided so as to face the extensible sheet, whereby the protrusion sandwiches the elastic sheet via the low extensible sheet. Press. Therefore, the situation where the elastic sheet is locally stretched thinly by the top surface of the protrusion is effectively suppressed.
  • the extensibility of the low extensibility sheet located on the protrusion side is lower than that of the elastic sheet. Therefore, it is effectively avoided that the low extensible sheet is locally stretched thinly by the top surface of the protrusion, based on the low extensibility of the sheet. An amount of low stretch sheet can be left. As a result, the low-extensible sheet and the stretchable sheet are bonded with high bonding strength.
  • An apparatus for producing a composite sheet having a stretchable sheet according to an absorbent article and a low stretchable sheet having a lower stretchability than the stretchable sheet An apparatus for preparing the low-stretch sheet formed such that first portions stretched in a predetermined direction and second portions not stretched more than the first portion are alternately arranged in the predetermined direction; An apparatus for fixing the stretchable sheet to the low stretchable sheet via a plurality of joints while aligning the stretchable direction in the predetermined direction with the stretchable sheet stretched in the stretchable direction;
  • the plurality of joint portions are provided in a discontinuous manner in both the stretch direction and the direction intersecting the stretch direction, and are adjacent to the stretch direction among the plurality of joint portions.
  • the non-joining portion located between the joining portions includes at least one center position in the predetermined direction of the first portion and at least one center position in the predetermined direction of the second portion, respectively.
  • the composite sheet manufacturing apparatus relating to such an absorbent article, it is possible to form a beautiful wrinkle on the composite sheet with the same reason as described in the above manufacturing method.
  • FIG. 1A is a schematic perspective view of a pant-type diaper 1.
  • FIG. 1B is a schematic plan view of the unfolded diaper 1 as seen from the skin side.
  • FIG. 2 is a schematic perspective view showing the exploded diaper 1 in an exploded state.
  • the side that should be located on the skin side of the wearer is simply referred to as “skin side”, and on the other hand, on the non-skin side of the wearer.
  • the side to be positioned is simply referred to as the “non-skin side”.
  • the diaper 1 is, for example, a two-piece type diaper 1. That is, the diaper 1 has, as a first part, an absorbent main body 3 having a substantially rectangular shape in plan view that absorbs excretory fluid such as urine, and is provided to cover the non-skin side surface of the absorbent main body 3.
  • the outer sheet 7 having a substantially hourglass shape in plan view that forms the outer casing of the diaper 1 is provided as the second component.
  • the absorptive main body 3 has an absorptive core 3c that absorbs excretory fluid.
  • the absorbent core 3c is formed by molding liquid absorbent fibers such as pulp fibers and liquid absorbent granular materials such as superabsorbent polymers into a substantially rectangular shape in plan view as an example of a predetermined shape.
  • this absorptive core 3c may be coat
  • the skin side surface of the absorbent core 3c is provided with a liquid-permeable top sheet 4 such as a nonwoven fabric so as to cover the surface.
  • the non-skin side surface of the absorbent core 3c has the surface
  • a liquid-impermeable leak-proof sheet 5 such as a film is provided so as to cover the entire surface.
  • both the sheets 4 and 5 are formed in a substantially rectangular shape in plan view, and both the sheets 4 and 5 are outward from the respective end portions in the longitudinal direction of the absorbent core 3c. Jumped out. And the part 4eL which protruded in the top sheet 4 and the part 5eL which protruded in the leak-proof sheet 5 are mutually joined by adhesion
  • the leak-proof sheet 5 is dimensioned so as to protrude outward from both sides of the absorbent core 3c, and the protruding portions 5eW and 5ew are respectively folded back to the skin side,
  • the top sheet 4 is fixed by adhesion, welding or the like in a state of covering each end in the width direction. And thereby, the absorptive core 3c is made into the state wrapped by the top sheet
  • 1B is a flexible sheet having a substantially hourglass shape in a plan view, and the sheet 7 has a thickness direction, a longitudinal direction, and a width direction as three directions orthogonal to each other. ing.
  • the exterior sheet 7 is divided into three portions 7f, 7b, and 7c with respect to the longitudinal direction. That is, the exterior sheet 7 is formed on an abdominal side portion 7f disposed on the wearer's belly side, a back side portion 7b disposed on the wearer's back side, and a crotch portion 7c disposed on the wearer's crotch. It is divided.
  • the crotch part 7c is located between the abdomen side part 7f and the dorsal side part 7b, so that the crotch part 7c has a shape that is constricted in the width direction in a substantially hourglass shape in plan view. This is part 7c.
  • a so-called laminate sheet 7 having a two-layer structure is used for the exterior sheet 7. That is, the exterior sheet 7 has an inner layer sheet 8 that forms an inner layer facing the wearer's skin when the diaper 1 is worn, and an outer layer sheet 9 that forms an outer layer facing the non-skin side during the wearing,
  • the inner layer sheet 8 and the outer layer sheet 9 are bonded together by adhesion or welding while being overlapped in the thickness direction.
  • the joined portions j, j... which are joined portions are welded in a predetermined joining pattern formed by discontinuous dispersion (see FIG. 3), which will be described later.
  • a stretchable sheet 8 having stretchability in the width direction of the diaper 1 is used.
  • the material of the outer layer sheet 9 has a low extensibility in the width direction of the diaper 1.
  • a low stretch sheet 9 is used.
  • the stretchable inner layer sheet 8 is stretched to a predetermined stretch ratio such as 2.5 times the natural length in the width direction (hereinafter also referred to as the stretched state), and is also stretched in the width direction.
  • both the sheets 8 and 9 are fixed integrally with the above-mentioned joining pattern. Therefore, when the stretched state is released, the inner layer sheet 8 shrinks in the width direction of the diaper 1 based on its own stretchability.
  • the low stretchable outer layer sheet 9 has a plurality of hooks.
  • the diaper 1 bends in the width direction, whereby the outer layer sheet 9 quickly follows the contraction of the inner layer sheet 8 and shortens the entire length in the width direction.
  • the outer sheet 7 is shortened in the width direction as a whole, and the outer surface of the outer sheet 7 is caused by the bending of the outer layer sheet 9. It is in a state where several traps are approaching.
  • the exterior sheet 7 can be stretched approximately elastically until the wrinkle is fully extended, whereby the exterior sheet 7 of the diaper 1 It has become a specification with elasticity.
  • FIG. 3 is a schematic enlarged view of the exterior sheet 7 in the stretched state (first stretched state described later) in which the wrinkles are fully stretched and stretched in the width direction, from the outer layer sheet 9 side, in order to explain the device.
  • the outer layer sheet 9 is formed with a plurality of bonding portions j, j... For bonding to the inner layer sheet 8.
  • the parts j, j... Are provided in a discontinuous manner in both the width direction and the longitudinal direction.
  • the non-joining part jn located at (the part jn that is not joined) has low rigidity due to the non-joining. Therefore, when the outer layer sheet 9 contracts in the width direction, wrinkles mainly occur at the non-joined portions jn, jn. And if the said wrinkle is approaching for every non-joining part jn, jn ... at this time, the appearance of the outer-layer sheet
  • seat 9 will become favorable. That is, the appearance of the non-joint portion jn is better when there is less misalignment. In addition, the heel usually tends to move toward a portion having a difference in rigidity.
  • a rigidity difference is given in advance to the non-joined portion jn with respect to the outer layer sheet 9 before being joined to the inner layer sheet 8. is doing.
  • the application of the rigidity difference is realized as follows. That is, for the outer layer sheet 9, the first portions 9a1 extended in the width direction and the second portions 9a2 not extended more than the first portion 9a1 are alternately formed in the width direction. At least one center position C9a1 in the width direction of the first portion 9a1 and one center position C9a2 in the width direction of the second portion 9a2 are included in each non-joining portion jn.
  • a plurality of joint rows Rj, Rj,... are arranged at a predetermined pitch PRj in the longitudinal direction, and the pitch PRj is arbitrary from a range of 1.5 mm to 5 mm, for example.
  • a value is selected, preferably an arbitrary value from the range of 2 mm to 4 mm, more preferably from a range of 2 mm to 3 mm.
  • it is smaller than the lower limit value of each range it is difficult to secure a sufficient size for forming the ridges in the non-joined portion jn.
  • the elastic sheet 8a and Fixation with the low extensibility sheet 9at becomes weak. Therefore, it is preferable to be within the above range. However, it is not limited to the above range.
  • the forming process for forming the first part 9a1 and the second part 9a2 the bonding process for forming the joints j, j... Will be described later.
  • stretchability refers to the property that when an external force of tension is applied, it stretches approximately elastically in the direction of the external force and contracts approximately elastically when the external force is released. is there. Moreover, although it repeats, the sheet
  • Such a stretchable sheet 8 desirably satisfies the following conditions. That is, in the state where both ends in the longitudinal direction of the belt-like sheet having a short dimension of 25 mm are equally gripped with the total length of 25 mm in the short direction, the both ends are each 1.0 (N) as a power point.
  • the elongation (%) when pulled in the longitudinal direction by an external force is an arbitrary value in the range of 50% to 300%, and the residual elongation strain (%) that remains without contracting after the external force is released and contracted
  • the value is an arbitrary value in the range of 0% to 40%.
  • the elongation rate is an arbitrary value in the range of 70% to 200%
  • the residual elongation strain is an arbitrary value in the range of 0% to 30%.
  • the above-mentioned elongation rate (%) is the natural length L0, which is the length of the belt-like sheet at the time of no load before being pulled, from the length L1 of the belt-like sheet when pulled with an external force of 1.0 (N).
  • the “low stretch sheet 9” is a stretch sheet lower than the stretch sheet 8 described above. That is, the stretch rate (%) when an external force of a predetermined amount of tension is applied is lower than the stretch rate (%) of the stretchable sheet 8 described above.
  • the low-extensible sheet 9 desirably satisfies the following conditions. That is, in the state where both ends in the longitudinal direction of the belt-like sheet having a short dimension of 25 mm are equally gripped with the total length of 25 mm in the short direction, the both ends are each 1.0 (N) as a power point.
  • the elongation (%) when pulled in the longitudinal direction by an external force is preferably an arbitrary value in the range of 0% to 20%. More preferably, the elongation rate is an arbitrary value in the range of 0% to 10%.
  • a non-woven fabric, a woven fabric, or a film may be used as a form of the stretchable sheet 8 and the low stretchable sheet 9.
  • the nonwoven fabric which can be utilized for the elastic sheet 8 it is appropriate to perform a gear stretching process or the like on a nonwoven fabric having a thermoplastic elastomer fiber exhibiting substantially elasticity and a thermoplastic resin fiber exhibiting substantially inelasticity.
  • Examples of the nonwoven fabric subjected to various stretching treatments That is, by performing such stretching treatment, if the substantially inelastic thermoplastic resin fibers contained in the nonwoven fabric are plastically deformed or the joints between the fibers are destroyed, the substantially elastic fibers of the thermoplastic elastomer fibers can be obtained.
  • the nonwoven fabric can be changed to a structure that hardly inhibits elastic deformation, whereby the stretchability of the nonwoven fabric is expressed and the stretchable sheet 8 can be used.
  • the substantially elastic thermoplastic elastomer examples include polyurethane elastomers, polystyrene elastomers, polyolefin elastomers, polyamide elastomers, and the like.
  • substantially inelastic thermoplastic resin fibers include fibers containing polyolefin resins, and examples of polyolefin resins include polyethylene (PE), polypropylene (PP), and ethylene- ⁇ olefin copolymers.
  • PE polyethylene
  • PP polypropylene
  • ethylene- ⁇ olefin copolymers examples include polyethylene (PE), polypropylene (PP), and ethylene- ⁇ olefin copolymers.
  • the stretchable sheet 8 is obtained by subjecting a mixed fiber type nonwoven fabric having polyurethane-based elastomer fibers and PP fibers to gear stretching treatment.
  • seat 9 it laminates
  • the fiber structure is not limited to a single fiber made of a single thermoplastic resin as described above.
  • a composite fiber having a core-sheath structure in which the core material is PP and the sheath material is PE may be used, or a fiber having a structure other than these may be used.
  • a spunbonded nonwoven fabric of PP fibers is used as the low stretch sheet 9.
  • the absorptive main bodies 3 described above are arranged in the longitudinal direction at the center position in the width direction on the skin side surface of the exterior sheet 7 having such a two-layer structure, that is, the skin side surface of the inner layer sheet 8. It is attached with the direction aligned. Such attachment is performed by joining at least the end portions 3e, 3e in the longitudinal direction of the absorbent main body 3 to the exterior sheet 7. In this example, as shown in FIG. 2, each end portion 3e, 3e is attached. Are formed in a substantially T-shape with joint portions j3 and j3 for joining the absorbent main body 3 and the exterior sheet 7, respectively.
  • each joint j3, j3 extends toward the crotch portion 7c starting from the laterally long strip portion j3W that is long in the width direction of the diaper 1 and the central portion in the lateral direction of the lateral strip portion j3W. And a vertically long belt-like portion j3L. And this effectively avoids that the absorptive main body 3 and the exterior sheet 7 restrain each other more than necessary.
  • the shape of the joint j3 is not limited to this.
  • a dotted joint j3C may be additionally provided at a position between the pair of T-shaped joints j3 and j3, or the end portions 3e and 3e of the absorbent main body 3 may be abbreviated.
  • a joint portion (not shown) having a substantially rectangular shape extending over the entire area may be formed at each of the end portions 3e and 3e, or a joint portion having a shape other than the shape described above may be formed.
  • the formation of the joint j3 is realized by adhesion of a hot melt adhesive, but is not limited to this, and may be, for example, welding.
  • attachment of this absorptive main body 3 and the exterior sheet 7 is the expansion
  • FIG. 4A is a schematic side view of a production line LM for producing the diaper 1.
  • FIG. 4B shows a state in which the diaper 1 is manufactured in a schematic plan view corresponding to FIG. 4A.
  • a base sheet 7a (corresponding to a composite sheet) of the diaper 1 is generated. Then, the base sheet 7a is continuously transported along a predetermined transport direction by an appropriate transport mechanism CV, CV, etc., and during the transport, punching and parts are performed on the base sheet 7a. The base sheet 7a sequentially changes its state each time, such as attachment, and finally the diaper 1 having the state shown in FIG. 1A is manufactured.
  • the base sheet 7a is basically conveyed in a so-called lateral flow mode. That is, the base material sheet 7a is conveyed in a state in which portions corresponding to the diaper 1 are aligned in a line in the conveyance direction while aligning the direction corresponding to the width direction of the diaper 1 in the conveyance direction.
  • Examples of the transport mechanism CV used for the transport include a transport roller, a suction belt conveyor having a suction holding function on a belt surface as a mounting surface, and a base sheet 7a between endless belts arranged in pairs in the vertical direction.
  • a belt conveyor or the like serving as the transport path is used.
  • a plurality of processing units 10, 20,... are arranged side by side in the transport direction in order to perform the various processing processes.
  • the exterior sheet generation processing unit 10 the leg hole opening formation processing unit 20, the exterior sheet contraction processing unit 30, the absorbent main body attachment processing unit 40, and the two-fold processing unit 50.
  • an end seal processing unit 60 and a split processing unit 70 are arranged side by side in the transport direction in order to perform the various processing processes.
  • the conveyance direction set on the production line LM is referred to as “MD direction”.
  • One of the two directions orthogonal to the MD direction is referred to as “CD direction”, and the other is referred to as “Z direction”.
  • the CD direction is parallel to the width direction of the substrate sheet 7a, and in FIG. 4A, the CD direction is the direction penetrating the paper surface.
  • the Z direction is parallel to the thickness direction of the base sheet 7a.
  • the MD direction corresponds to both the “stretching direction” and the “predetermined direction”
  • the CD direction crosses the “direction intersecting the stretching direction” and the “predetermined direction”. It corresponds to both “direction”.
  • FIG. 5 is a schematic side view of the exterior sheet generation processing unit 10 as the first processing unit.
  • this processing unit 10 using the processing device 11 and the joining device 15, as the base sheet 7a of the diaper 1, a continuous sheet 7a of the exterior sheet 7 that is continuous in the MD direction (hereinafter simply referred to as the exterior sheet 7a).
  • the continuous sheet 9 a of the low-extension sheet 9 (hereinafter, simply referred to as “low-extension sheet 9 a”) serving as the outer layer sheet 9 is conveyed along the MD direction.
  • the aforementioned first portion 9a1 and second portion 9a2 are alternately formed in the MD direction with respect to 9a (corresponding to “preparing”).
  • a continuous sheet 8 a of the stretchable sheet 8 (hereinafter simply referred to as “stretchable sheet 8 a”) that is the inner layer sheet 8 that is conveyed with the stretchable direction along the MD direction is substantially omitted.
  • the sheet is stretched in the MD direction from a natural length state to a predetermined stretching magnification, and the low-stretch sheet 9a is overlapped and joined to the sheet 8a from the thickness direction in this stretched state (corresponding to “fixing”). .
  • the exterior sheet 7a is generated.
  • FIG. 6 is a schematic side view of the processing apparatus 11 shown partially enlarged.
  • FIG. 7 is a view taken along arrow VII-VII in FIG.
  • the processing apparatus 11 includes a transport mechanism 12 that transports the low-extensible sheet 9 a along the MD direction, and a corrugated roll mechanism 13.
  • the transport mechanism 12 has, for example, a plurality of transport rollers 12R, 12R,... That rotate around a rotation axis along the CD direction, and each transport roller 12R is disposed along the transport path of the low-extensible sheet 9a. ing.
  • peripheral speed value V12R (m / min) of each conveying roller 12R is substantially the same as the conveying speed value (m / min) of the low-extensible sheet 9a conveyed from the upstream process.
  • the transport mechanism 12 transports the low-extensible sheet 9a in a state in which the low-stretch sheet 9a is stretched so as not to stretch and to loosen.
  • the corrugated roll mechanism 13 includes a pair of upper and lower corrugated rolls 13 u and 13 d that rotate around the rotation axis along the CD direction with their outer peripheral surfaces facing each other. And in the outer peripheral surface of each corrugated roll 13u, 13d, while the peak part 13m and the trough part 13v are alternately formed along the rotation direction, respectively, each peak part 13m and each trough part 13v are respectively It extends in the CD direction. Moreover, as shown in the enlarged view in FIG. 6, when each corrugated roll 13u, 13d is rotating, the peak 13m of one corrugated roll 13u (13d) is the valley of the other corrugated roll 13d (13u). The mountain portions 13m and the valley portions 13v are engaged with each other with a slight gap so as to enter 13v. And during the rotation, the low-extensible sheet 9a is passed along the MD direction between the corrugated rolls 13u and 13d.
  • the low-extensible sheet 9a that is passing is in the other corrugated roll 13d (13u), the other ridges 13m, 13m adjacent to each other and the valley 13v between the ridges 13m, 13m.
  • the corrugated roll 13u (13d) is deformed into a three-point bend by the crest 13m (FIG. 6).
  • the portion 9a2 that contacts the top surface of the peak portion 13m of one of the corrugated rolls 13d (13u) in the low-extension sheet 9a is in contact with the top surface so as to be relatively unmovable.
  • the second portion 9a2 is not stretched, and the portion 9a2 that is in contact with the top surface of the peak portion 13m of the other corrugated roll 13u (13d) in the sheet 9a is also generally immovable relative to the top surface.
  • the second portion 9a2 is formed without being substantially stretched.
  • the portion 9a1 between the two second portions 9a2 and 9a2 is stretched based on the above-described intrusion of the mountain portion 13m, so that the portion 9a1 becomes the above-described first portion 9a1.
  • the first portion 9a1 and the second portion 9a2 are alternately formed in the MD direction on the low-extension sheet 9a, and then the sheet 9a is stretched by the conveying roller 12R. It is sent to the joining device 15.
  • the formation pitch Pv in the rotation direction of the valley portion 13v is equal to the formation pitch Pm in the rotation direction of the peak portion 13m (the top surface of the peak portion 13m).
  • the formation pitch Pm of the crest 13m is equal to each other between the upper and lower corrugated rolls 13u and 13d.
  • the pair of corrugated rolls 13u and 13d are arranged at the intermediate position between the crest 13m and crest 13m adjacent to each other in the rotation direction of the other roll 13d (13u). It rotates while the center position of the rotational direction of the peak 13m of 13d is located. Therefore, as shown in FIG. 3, the second portion 9a2 is formed at a predetermined formation pitch P9a2 in the MD direction.
  • an arbitrary value is selected from a range of 0.5 mm to 3.0 mm, and preferably an arbitrary value within a range of 0.7 mm to 2.0 mm. More desirably, the value is set to an arbitrary value in the range of 1.0 mm to 1.5 mm. And if it is in such a range, the wrinkle of the size comfortable to an eye can be formed in outer layer sheet 9a.
  • the peak portion 13m of one corrugated roll 13u of the pair of corrugated rolls 13u, 13d is placed in the CD direction ("direction intersecting a predetermined direction" and "rotating axis"). Are cut out at predetermined positions Pk, Pk. As a result, the peaks 13m are discontinuously provided for the following reason.
  • a non-woven fabric of PP fiber is used as the low-extension sheet 9a, it is not always necessary to partially cut out the peak portion 13m, that is, a pair in which the peak portion 13m is not cut out at all.
  • the low-extension sheet 9a can maintain the state of low extensibility as usual, that is, can function as a sheet with low extensibility.
  • a sheet containing an appropriate elastomer fiber in addition to the PP fiber may be used as the low-extension sheet 9a.
  • the sheet 9a has developed elasticity, and as a result, The state of low extensibility cannot be maintained. That is, when the substantially inelastic PP fiber in the sheet 9a is plastically deformed by the above three-point bending-shaped stretching process, the stretched PP fiber can inhibit the substantially elastic stretching deformation of the elastomer fiber. No state. Then, thereafter, the sheet 9a is in a state where it can be freely stretched and deformed based only on the elastomer fibers, that is, in a state where stretchability is exhibited.
  • a pair of corrugated waves is used for the purpose of suppressing the expression of the stretchability that may occur after passing through the corrugated roll mechanism 13 with respect to the low stretchable sheet 9a of any composition.
  • the peak portion 13m of one of the corrugated rolls 13u of the rolls 13u and 13d is cut out at predetermined positions Pk, Pk... In the CD direction, thereby providing the peak portions 13m discontinuously. That is, in this case, the peak portion 13m does not exist at the predetermined position Pk, and thus the above three-point bend-shaped stretching process is not performed at the same position Pk. As a result, at least the position Pk is stretchable.
  • the peak portions 13m may be provided continuously over the CD direction, but may be provided discontinuously. However, it is preferable to provide the peak portions 13m continuously because it is not necessary to perform processing for making the peak portions 13m discontinuous.
  • a heater is incorporated in at least one of the pair of upper and lower corrugated rolls 13u and 13d, thereby adjusting the temperature of the peak portion 13m of the corrugated rolls 13u and 13d. You may do it. And if it does in this way, since the low extension sheet
  • an adjusting the heating temperature an arbitrary value in which the temperature of the peak portion 13 m is in the range of 25 to 40 ° C. can be exemplified.
  • preheating rolls 14 a and 14 b may be disposed at a position upstream of the corrugated roll mechanism 13 in the MD direction.
  • the preheating rolls 14a and 14b are also rollers that rotate around a rotation axis along the CD direction.
  • a heater is provided inside the rollers 14a and 14b, and the outer peripheral surfaces of the rollers 14a and 14b are provided by the heater. Can be heated.
  • the low-extensible sheet 9a is conveyed in the MD direction when the rolls 14a and 14b rotate in a state of being wound around the outer peripheral surfaces of the preheating rolls 14a and 14b.
  • the conductive sheet 9a is heated.
  • the joining device 15 includes a nip roll mechanism 16 and an ultrasonic welding device 17 disposed downstream of the mechanism 16 in the MD direction. And in this joining device 15, the stretchable sheet 8a conveyed in an approximately natural length state from the upstream process is stretched in the MD direction between the nip roll mechanism 16 and the ultrasonic welding device 17 up to the stretch magnification described above, Then, while maintaining this stretched state, the ultrasonic welding device 17 welds and joins the sheet 8 a to the low stretch sheet 9 a fed from the corrugated roll mechanism 13.
  • the nip roll mechanism 16 has a pair of nip rolls 16R and 16R that rotate around a rotation axis along the CD direction.
  • the elastic sheet 8a continuously conveyed from the upstream process is driven with a driving force applied from a servo motor (not shown) as a driving source while the pair of nip rolls 16R and 16R are sandwiched between the outer peripheral surfaces.
  • the sheet 8a is sent to the ultrasonic welding device 17 with a conveyance speed value substantially equal to the peripheral speed value V16R of the nip rolls 16R and 16R.
  • the ultrasonic welding device 17 includes a horn 17h having a vibration surface 17hs that vibrates in a normal direction with a predetermined frequency of 20 kHz to 35 kHz and a predetermined amplitude of 1 to 30 microns, and the vibration surface 17hs of the horn 17h.
  • An anvil roller 17a that receives vibrations on the outer peripheral surface.
  • the anvil roller 17a is supported so as to be rotatable around a rotation axis along the CD direction, and is driven to rotate by being applied with a driving force from a servo motor (not shown) as a driving source.
  • both the low stretch sheet 9a sent from the corrugated roll mechanism 13 and the stretchable sheet 8a sent from the nip roll mechanism 16 have almost no relative slip with respect to the outer peripheral surface. For example, it is wound at a winding angle of 45 ° or more. Therefore, when the anvil roller 17a is driven to rotate, both the stretchable sheet 8a and the low-extensible sheet 9a have the same conveying speed value V8a9a as the peripheral speed value V17a of the anvil roller 17a. Conveyed along.
  • the transport speed value V8a9a is as large as the expansion magnification times the peripheral speed value V16R of the nip roll 16R of the nip roll mechanism 16 as described above. Therefore, the stretchable sheet 8a is stretched to the above-described stretch ratio and is wound around the outer peripheral surface of the anvil roller 17a.
  • the transport speed value V8a9a is substantially the same as the peripheral speed value V12R of the transport roller 12R of the low-extensible sheet 9a. Therefore, the low-extensible sheet 9a is wound around the outer peripheral surface of the anvil roller 17a in a state in which the low-extensible sheet 9a is not stretched and is not loosened.
  • the stretchable sheet 8a stretched to the stretch magnification and the stretchable low stretchable sheet 9a are superposed on each other in the thickness direction on the outer peripheral surface of the anvil roller 17a, and
  • ultrasonic vibration energy is applied to the sheets 8a and 9a from the vibration surface 17hs of the horn 17h.
  • the sheets 8a and 9a are joined in a joining pattern in which a plurality of joining portions j, j... Are discontinuously dispersed as described above, and the exterior sheet 7a is generated. .
  • the exterior sheet 7a is sent to the downstream in the MD direction by the anvil roller 17a, so that the delivered exterior sheet 7a has a conveyance speed value V8a9a substantially equal to the peripheral speed value V17a and downstream in the MD direction. It is conveyed to the leg hole opening forming processing unit 20.
  • the vibration surface 17hs of the horn 17h is a plane whose normal direction is the vibration direction.
  • a plurality of protrusions 17at, 17at,... are arranged in an arrangement pattern corresponding to the joining pattern in order to form the joints j, j,. (Refer to the enlarged view showing the outer peripheral surface of the anvil roller 17a in FIG. 8 developed in the rotational direction). Then, when the vibration surface 17hs of the horn 17h selectively hits the portion of the low-extensible sheet 9a that contacts the top surface of the protrusion 17at, ultrasonic vibration energy is input and melted. ..
  • the joining pattern is a staggered pattern as described above (FIG. 3), as shown in FIG. 8, the plurality of protrusions 17at, 17at ... are provided in a staggered pattern. Furthermore, since it is a transverse flow conveyance, the width direction of the diaper 1 is along the MD direction and the rotation direction of the anvil roller 17a.
  • At least one center position C9a1 in the width direction of the first portion 9a1 of the sheet 9a and a center position C9a2 in the width direction of the second portion 9a2 are included in the non-joining portion jn of the low-extension sheet 9a.
  • the protrusions 17at, 17at,... are arranged so that the relationship (FIG. 3) is established in the MD direction.
  • the length Ljn in the MD direction of the non-joining portion jn in FIG. 3 is larger than the formation pitch P9a2 of the second portion 9a2 in the sheet 9a so that the above relationship is established.
  • each of the protrusions 17at, 17at ... is arranged. That is, in the example of FIG.
  • the length L17an in the MD direction of the non-existing portion 17an of the protrusion 17at located between the protrusions 17at and 17at is the formation pitch P9a2 of the above-described second portion 9a2 (FIG. 3). Is bigger than.
  • each non-joined part jn in the low stretchable sheet 9a is based on the rigidity difference between the first part 9a1 and the second part 9a2. As a result, it buckles quickly, and as a result, the non-joint portion jn is surely wrinkled and the appearance of the outer layer sheet 9a is improved as a whole.
  • the length Ljn of the non-joining portion jn is set to be not more than twice the formation pitch P9a2 of the second portion 9a2, but this is not restrictive.
  • the length Ljn in the MD direction of the non-joining part jn may be made larger than the multiple of the formation pitch P9a2 in the MD direction of the second portion 9a1.
  • the center position C9a1 in the MD direction of the first portion 9a1 and the center position C9a2 in the MD direction of the second portion 9a2 are each included in the non-joint portion jn.
  • the square was illustrated as a planar shape of the top surface of the protrusion 17at of the anvil roller 17a, it is not limited to this.
  • it may be a regular polygon of a regular pentagon or more, a regular circle, or a shape other than these.
  • a low-extensible sheet 9a is arranged facing the outer peripheral surface of the anvil roller 17a (corresponding to “one clamping member”), and a horn 17h (“the other clamping member”) is arranged.
  • the stretchable sheet 8a is disposed to face the vibration surface 17hs (corresponding to the “surface portion”) of the “pressure member”), the invention is not limited to this and may be reversed. That is, the stretchable sheet 8a may be disposed facing the outer peripheral surface of the anvil roller 17a, and the low-extensible sheet 9a may be disposed facing the vibration surface 17hs of the horn 17h.
  • the former is preferable from the viewpoint of improving the joint strength of the joint j.
  • the vibration surface 17hs of the horn 17h is opposed to the elastic sheet 8a, and the area of the vibration surface 17hs is the outer peripheral surface of the anvil roller 17a. It is made larger than the area of the top surface of the protrusion 17at. Moreover, the protrusion 17at of the outer peripheral surface of the anvil roller 17a is provided facing the low-extension sheet 9a, and thereby the protrusion 17at sandwiches the elastic sheet 8a via the low-extension sheet 9a. Therefore, the situation where the elastic sheet 8a is locally thinly stretched by the top surface of the protrusion 17at and effectively penetrates is effectively suppressed.
  • the low-extensible sheet 9a and the stretchable sheet 8a can be bonded with high bonding strength.
  • the exterior sheet formed by joining the stretchable sheet 8a and the low stretchable sheet 9a even after the stretchable sheet 8a is separated from the vibration surface 17hs of the horn 17h. 7a is maintained in a state of being wound around the anvil roller 17a for a while.
  • the shrinkage deformation in the CD direction of the exterior sheet 7a is effectively suppressed.
  • the winding is realized by disposing the transport roller 18R at the downstream position in the MD direction so as to face the outer peripheral surface of the anvil roller 17a.
  • the exterior sheet 7a is wound around the anvil roller 17a and the transport roller 18R in an S shape so that the exterior sheet 7a is wound around the anvil roller 17a even at a position downstream of the vibration surface 17hs in the MD direction.
  • the state is maintained.
  • it is not limited to this.
  • the low-extensible sheet 9a is in a stretched state.
  • the low-extension sheet 9a is in a state in which it is difficult to extend any more based on the low stretchability. That is, it is in a so-called non-elongation state. Therefore, even if an unexpectedly large tension acts during the subsequent conveyance, the low-stretch sheet 9a can resist the tension so that the length of the exterior sheet 7a in the MD direction does not change. Therefore, the formation process of the leg opening 7HL that is performed on the exterior sheet 7a thereafter can be performed with high positional accuracy.
  • non-stretched state for example, “the sheet is not damaged, and further, the sheet is kept in a state of being stretched further by 5% or more from the current state. It can be said that the state does not expand.
  • the above-mentioned “stretching magnification” indicates how many times the total length of the stretchable elastic sheet 8a is stretched to the natural length before stretching, and the stretching magnification is the completed state. It defines how much the exterior sheet 7 (7a) in the diaper 1 can be extended in the width direction from the unloaded state. That is, in the diaper 1 manufactured by setting the stretchable sheet 8a to a predetermined stretch magnification, the exterior sheet 7 (7a) is stretched in the width direction of the diaper 1 until the stretched state corresponds to the stretch magnification. Can do.
  • the expansion magnification is set to an arbitrary value in the range of 1.5 to 4 times, for example, and in this example, the expansion magnification is set to 2.5 times.
  • first stretched state the state in which the stretchable sheet 8a is stretched to the stretch magnification set by the exterior sheet generation processing unit 10 is referred to as a “first stretched state”.
  • leg opening formation processing unit 20 Even in the next leg-hole opening formation processing unit 20, the extended state of the exterior sheet 7a is maintained in the first extended state described above. Then, as shown in FIGS. 4A and 4B, in the leg opening formation processing unit 20, the leg opening is formed at a predetermined first pitch P ⁇ b> 1 with respect to the exterior sheet 7 a conveyed in the first extended state.
  • the part 7HL is formed by punching.
  • the first pitch P1 corresponds to the length of one diaper 1 in the MD direction in the first extended state. Therefore, one leg opening 7HL is formed in the exterior sheet 7a for each part that becomes the diaper 1. Incidentally, the length of one diaper 1 changes according to the extended state of the exterior sheet 7a. For example, when the stretched state is relaxed and the exterior sheet 7a contracts, the length of one diaper 1 in the MD direction is shortened by the contraction.
  • the formation process of the leg opening 7HL is performed by the die cutter device 21.
  • the die cutter device 21 has a pair of upper and lower rolls 21u and 21d that rotate around a rotation axis along the CD direction with the outer peripheral surfaces facing each other.
  • the upper roll 21u is a cutter roll 21u having a cutter blade 21c on the outer peripheral surface
  • the lower roll 21d is an anvil roll 21d that receives the cutter blade 21c on a smooth outer peripheral surface.
  • the cutter blade 21c is an annular so-called punching blade corresponding to the shape of the leg opening 7HL, and protrudes from the outer peripheral surface of the cutter roll 21u.
  • the drive source of the drive rotation of the upper and lower rolls 21u, 21d is a servo motor (not shown). Further, only one cutter blade 21c is provided on the outer peripheral surface of the upper roll 21u. Therefore, each time the exterior sheet 7a passes through the die cutter device 21 by the length of the first pitch P1 in the MD direction, the upper roll 21u and the lower roll 21d each make one rotation, whereby the exterior sheet 7a
  • the leg opening 7HL is formed at the first pitch P1.
  • a leg hole opening 7HL is formed in the exterior sheet 7a at a pitch corresponding to the length of one diaper 1 in the first extended state. In the extended state of 1, the sheet is sent to the exterior sheet shrinkage processing unit 30 downstream in the MD direction.
  • Exterior sheet shrinkage processing unit 30 In the next exterior sheet shrinkage processing unit 30, as shown in FIGS. 4A and 4B, the exterior sheet 7a conveyed in the first extended state is contracted in the MD direction.
  • the extension state of the extension ratio smaller than the extension ratio in the extension state (hereinafter referred to as the second extension state).
  • the amount of expansion of the exterior sheet 7a is reduced so that the expansion ratio, which was 2.5 times in the first extended state, is 2.25 times, which is 10% smaller. And this suppresses generation
  • the extension magnification in the first extension state is referred to as “first extension magnification M1”
  • the extension magnification in the second extension state is referred to as “second extension magnification M2”.
  • the shrinking process of the exterior sheet 7a is performed by the two nip roll mechanisms 31 and 33 provided side by side in the MD direction. That is, an upstream nip roll mechanism 31 is disposed at a predetermined position in the MD direction, and a downstream nip roll mechanism 33 is disposed at a position downstream of the upstream nip roll mechanism 31. Both nip roll mechanisms 31 and 33 have substantially the same configuration. That is, the upstream nip roll mechanism 31 has a pair of upper and lower nip rolls 31u and 31d that rotate around the rotation axis along the CD direction, and the downstream nip roll mechanism 33 also rotates around the rotation axis along the CD direction.
  • the nip rolls 31u and 31d receive driving force from a servo motor (not shown) as a driving source.
  • the exterior sheet 7a is fed downstream in the MD direction by being applied and rotated.
  • the nip rolls 33u and 33d of the downstream nip roll mechanism 33 sandwich the outer sheet 7a between the outer peripheral surfaces of the downstream nip roll mechanism 33, the nip rolls 33u and 33d are driven by a servo motor (not shown) as a drive source. By applying driving force and driving rotation, the exterior sheet 7a is sent further downstream in the MD direction.
  • the peripheral speed value V31 (m / min) of the nip rolls 31u and 31d of the upstream nip roll mechanism 31 is substantially the same value as the peripheral speed value V17a (m / min) of the anvil roller 17a of the ultrasonic welding device 17 described above.
  • the peripheral speed value V31 of the nip rolls 31u, 31d is the first transport speed that is the transport speed value (m / min) of the outer sheet 7a that is transported in the first extended state on the most upstream side thereof. It is almost the same value.
  • the peripheral speed value V33 (m / min) of the nip rolls 33u and 33d of the downstream nip roll mechanism 33 is 10% smaller than the peripheral speed value V31 of the nip rolls 31u and 31d of the upstream nip roll mechanism 31.
  • the stretched state of the sheet 7a is 10 more than the stretch magnification in the first stretched state. It is shrunk to the second extension state where the extension ratio is small by%. And this exterior sheet
  • the conveyance of the exterior sheet 7a after the contraction process is basically performed in the second extended state.
  • the conveyance speed value of the exterior sheet 7a is the above-described first conveyance. This is realized by maintaining the conveyance speed value smaller than the speed value by a rate corresponding to the above-described contraction (hereinafter referred to as the second conveyance speed value).
  • the second transport speed value can be referred to as “a value obtained by multiplying the first transport speed value by a division value obtained by dividing the second expansion ratio by the first expansion ratio”.
  • the percentage notation value is the shrinkage rate (%).
  • the shrinkage rate is 10% as described above, but the present invention is not limited to this. That is, an arbitrary value may be set as long as it can be contracted while maintaining the stretched state of the exterior sheet 7a, for example, an arbitrary value in the range of 2% to 80% may be used.
  • the narrow value may be an arbitrary value in the range of 5% to 50%, and the narrow value may be an arbitrary value of 7% to 30%.
  • the absorptive main body 3 is attached at the second pitch P2 in the MD direction to the exterior sheet 7a conveyed in the second extended state.
  • the second pitch P2 corresponds to the length of one diaper 1 in the MD direction in the second extended state, but the second extended state is, as described above, the first This is a contracted state rather than the stretched state of 1. Therefore, the second pitch P2 is a value smaller than the first pitch P1 by the contraction rate.
  • the absorptive main body 3 is attached to the position between the leg periphery openings 7HL and 7HL adjacent to each other in the MD direction in the exterior sheet 7a.
  • the mounting process of the absorbent main body 3 is performed by, for example, the rotating drum device 41.
  • the rotary drum device 41 includes a rotary drum 42 that rotates about a rotation axis along the CD direction, a servo motor (not shown) that drives and rotates the rotary drum 42, and a rotational direction on the outer peripheral surface of the rotary drum 42. And a plurality of holding pads 43 arranged side by side.
  • Each holding pad 43 has a holding surface capable of sucking and holding the absorbent main body 3, and each holding surface faces outward in the rotational radius direction of the rotating drum 42. Then, by rotating around the rotation axis located at the center of the holding surface, each holding pad 43 can change the longitudinal direction of the absorbent main body 3 being held by the holding surface from the MD direction to the CD direction. is there.
  • Each holding pad 43 is configured to be reciprocally movable over a predetermined range in the rotational direction relative to the rotary drum 42, and the reciprocating operation is performed by an appropriate cam mechanism (not shown). Created from the rotational motion of the rotating drum 42. Accordingly, the pitch between the holding pads 43 adjacent to each other in the rotation direction can be changed according to the position of the rotation drum 42 in the rotation direction. That is, at the first position S1 in the rotation direction, the gap between the adjacent holding pads 43 and 43 can be made narrow, and at the second position S2 in the rotation direction, the holding pads 43 and 43 The interval between them can be greatly opened.
  • the first position S1 is supplied in the form of a continuous body 3a in which a plurality of absorbent main bodies 3 are continuously formed in the MD direction.
  • the cutter apparatus 45 located in the vicinity WHEREIN:
  • the continuous body 3 a is divided to generate a single-cut absorbent main body 3 on the holding pad 43.
  • the holding pad 43 is moved to the second position S2 in the rotation direction by the rotating operation of the rotating drum 42. During the movement, the holding pad 43 performs the above-described rotation operation to perform the rotation of the absorbent main body 3.
  • the direction of the longitudinal direction is changed from the MD direction to the CD direction.
  • the holding pad 43 performs the above-described reciprocating movement to change the pitch between the adjacent holding pads 43 and 43 to the second pitch P2.
  • the conveyance path of the exterior sheet 7a is disposed close to the second position S2. Therefore, the rotary drum device 41 can attach the absorbent main body 3 at the second pitch P2 in the MD direction with respect to the second extended exterior sheet 7a.
  • the exterior sheet 7a to which the absorbent main body 3 is attached is folded in two in the CD direction with the substantially central portion in the CD direction corresponding to the crotch part 7c of the diaper 1 as the folding position.
  • the exterior sheet 7a is brought into a state where one end and the other end in the CD direction of the sheet 7a are overlapped in the thickness direction.
  • one end portion finally becomes the ventral side portion 7f of the diaper 1, and the other end portion becomes the back side portion 7b of the diaper 1.
  • the folding process of the exterior sheet 7a is performed by a bi-fold guide member (not shown) disposed at a predetermined position in the MD direction.
  • the bi-fold guide member has a well-known configuration, for example, a combination of a plurality of appropriate bar members. Then, when the exterior sheet 7a passes through the position where the bifold guide member is disposed, the exterior sheet 7a is gradually folded by the guide member with the substantially central portion in the CD direction being the folding position. When it has passed, the exterior sheet 7a is folded in two.
  • the stretched state of the exterior sheet 7a in the bi-fold processing unit 50 is maintained in the above-described second stretched state, and the exterior sheet 7a is sent downstream in the MD direction in this stretched state. Is done. That is, the conveyance speed value of the exterior sheet 7a in the bi-fold processing unit 50 is maintained substantially the same as the above-described second conveyance speed value.
  • End seal processing unit 60 Even in the next end seal processing unit 60, the exterior sheet 7a is maintained in the second extended state.
  • the end seal processing unit 60 fixes the folded outer sheet 7a in the folded state. That is, one end and the other end in the CD direction of the exterior sheet 7a overlapped in the thickness direction by folding in two are welded at positions between the absorbent bodies 3 and 3 adjacent in the MD direction, Fix in a folded state.
  • the welded portion remains as an end seal portion jes on the exterior sheet 7a.
  • the formation target position of this end seal part jes appears in the MD direction at the 2nd pitch P2 since the exterior sheet 7a exists in a 2nd expansion
  • the end seal portion je is formed by the heat seal processing device 61.
  • the heat seal processing device 61 includes a pair of upper and lower rolls 61u and 61d that are driven and rotated around a rotation axis along the CD direction with their outer peripheral surfaces facing each other.
  • the upper roll 61u has a convex seal pattern portion 61sp heated on the outer peripheral surface
  • the lower roll 61d has a smooth outer peripheral surface to receive the seal pattern portion 61sp.
  • the seal pattern portion 61sp protrudes from the outer peripheral surface of the upper roll 61u in a shape corresponding to the end seal portion jes.
  • the drive source of the drive rotation of the upper and lower rolls 61u, 61d is a servo motor (not shown). Further, only one seal pattern portion 61sp is provided on the outer peripheral surface of the upper roll 61u. Therefore, every time the exterior sheet 7a passes through the heat seal processing device 61 by the length of the second pitch P2, the upper roll 61u rotates once, thereby forming the end seal portion je at the second pitch P2. As a result, end seal portions je are formed on the exterior sheet 7a at a pitch corresponding to the length of one diaper 1 in the second extended state.
  • Dividing processing unit 70 Even in the next division processing unit 70, the exterior sheet 7a is maintained in the second extended state. Therefore, the exterior sheet 7a fixed in the folded state is divided at the second pitch P2, and thereby the downstream end is separated from the exterior sheet 7a at the second pitch P2, and the diaper 1 is generated.
  • the dividing process of the exterior sheet 7 a is performed by the rotary cutter device 71.
  • the rotary cutter device 71 has a pair of upper and lower rolls 71u and 71d that are driven and rotated around a rotation axis along the CD direction with their outer peripheral surfaces facing each other.
  • the upper roll 71u is a cutter roll 71u having a cutter blade 71c on the outer peripheral surface
  • the lower roll 71d is an anvil roll 71d that receives the cutter blade 71c on a smooth outer peripheral surface.
  • the cutter blade 71c is, for example, a flat blade extending along the CD direction, and protrudes from the outer peripheral surface of the cutter roll 71u.
  • the exterior sheet 7a fixed in a folded state through the roll gap between the upper and lower rolls 71u, 71d passes, the exterior sheet 7a is divided at the position of the end seal portion jes. The downstream end portion of the exterior sheet 7 a is cut off, and the cut down downstream end portion becomes the diaper 1.
  • the drive source of the drive rotation of the upper and lower rolls 71u, 71d is a servo motor (not shown). Further, only one cutter blade 71c is provided on the outer peripheral surface of the upper roll 71u. Furthermore, the exterior sheet 7a is conveyed in the second extended state. Therefore, each time the exterior sheet 7a passes through the rotary cutter device 71 by the length of the second pitch P2, the upper roll 71u and the lower roll 71d each rotate one time, whereby one diaper 1 is formed from the exterior sheet 7a. It is generated only by being divided. Then, each generated diaper 1 is sent downstream in the MD direction by an appropriate transport mechanism CV such as a belt conveyor.
  • an appropriate transport mechanism CV such as a belt conveyor.
  • the exterior sheet generation processing unit 10 of the production line LM of the diaper 1 has the corrugated roll mechanism 13.
  • the corrugated roll mechanism 13 forms the first portion 9a1 and the second portion 9a2 on the low-extension sheet 9a, the sheet 9a is not taken up, and the joining device of the processing unit 10 is used as it is.
  • the present invention is not limited to this. That is, instead of the corrugated roll mechanism 13 provided in the diaper 1 production line LM, the mechanism 13 may be provided in another production line (not shown). In this case, the first portion 9a1 and the second portion 9a2 are formed on the low-extensible sheet 9a by the corrugated roll mechanism 13 of the other production line.
  • the sheet roll is moved from the storage location to the production line LM of the diaper 1 and attached to an appropriate feeding device (not shown) provided in the exterior sheet generation processing unit 10 of the production line LM. Then, the low elongation sheet 9a is fed out from the sheet roll (corresponding to “preparing”), whereby the low elongation sheet 9a in which the first portion 9a1 and the second portion 9a2 are formed is removed from the processing unit 10 This is supplied to the joining device 15.
  • the corrugated roll mechanism 13 is provided in the exterior sheet generation processing unit 10 as in the above-described embodiment.
  • the horn 17h itself of the ultrasonic welding device 17 is configured to be non-rotating, and the vibration surface 17hs is a flat surface, but this is not a limitation.
  • the horn 17h may also have a roller configuration similar to the anvil roller 17a.
  • the horn 17h may be configured as a roller (hereinafter referred to as a horn roller, not shown) that can rotate around a rotation axis along the CD direction, and its outer peripheral surface may function as a vibration surface.
  • the vibration surface as the outer peripheral surface of the horn roller vibrates in a direction approaching and separating from the outer peripheral surface of the anvil roller 17a.
  • the above-mentioned several protrusion 17at, 17at ... is provided in the outer peripheral surface of at least one roller of the horn roller or the anvil roller 17a by the arrangement pattern corresponding to the above-mentioned joining pattern.
  • the joining of the stretchable sheet 8 a and the low stretchable sheet 9 a performed by the exterior sheet generation processing unit 10 is performed by the ultrasonic welding device 17.
  • a heat seal processing device or a pressure processing device may be used instead of the ultrasonic welding device 17.
  • the configuration of the heat seal processing apparatus and the configuration of the crimping processing apparatus are similar to each other. That is, the difference in configuration between the two is mainly in the presence or absence of heating of the roll, and both apparatuses have a pair of upper and lower rolls 19u and 19d that are driven and rotated around the rotation axis along the CD direction.
  • the rolls 19u and 19d are each configured to rotate at a peripheral speed value equal to the peripheral speed value V17a of the anvil roller 17a in the case of the ultrasonic welding device 17 described above. Further, a plurality of protrusions (not shown) are arranged on the outer peripheral surface of at least one of the upper and lower rolls 19u and 19d in an arrangement pattern corresponding to the above-described bonding pattern. Therefore, according to such a configuration, the roll gap between the rolls 19u and 19d is low stretched in which the stretchable sheet 8a stretched to the first stretched state and the first portion 9a1 and the second portion 9a2 are formed.
  • the sheet 9a passes in a state where the sheet 9a is superposed on each other, but at the time of the passage, the two sheets 8a, 9a are clamped by the respective protrusions by the rolls 19u, 19d.
  • the staggered pattern is exemplified as the joining pattern for joining the stretchable sheet 8a and the low-extensible sheet 9a, but the invention is not limited to this.
  • it may be a lattice pattern in which joints j, j... Are formed at each intersection of lattices, or a pattern other than this may be used.
  • the stretchable direction of the stretchable sheet 8a is aligned with the MD direction
  • the first portions 9a1 and the second portions 9a2 are alternately formed in the MD direction on the low stretchable sheet 9a.
  • the joint portion is so arranged that at least one central position C9a1 of the first portion 9a1 and at least one central position C9a2 of the second portion 9a2 are included in the non-joint portion jn between the joint portions j, j adjacent in the MD direction.
  • j is formed and thereby, when the shrinkage in the MD direction occurs, the wrinkles are surely formed in the non-joined portion jn, but this is not restrictive. For example, the following may be performed.
  • the sheet 8a ′ is conveyed in the MD direction while keeping the expansion / contraction direction of the elastic sheet 8a ′ in the CD direction.
  • the sheet 9a ′ is conveyed in the CD direction.
  • the low-extensible sheet 9a ′ is also conveyed in the MD direction, and on the sheet 9a ′, the first part 9a1 ′ extended in the CD direction and the second part not extended more than the first part 9a1 ′.
  • the portions 9a1 ′ and 9a2 ′ are formed so that the portions 9a2 ′ are alternately arranged in the CD direction.
  • seat 9a in which the said 1st part 9a1 'and 2nd part 9a2' were formed is joined to the elastic sheet
  • the center position C9a1 ′ of the first part 9a1 ′ and the center position of the second part 9a2 ′ are in the non-joining part jn ′ between the joining parts j ′ and j ′ adjacent in the CD direction.
  • the junction j ′ is formed so as to include at least one C9a2 ′.
  • the junctions j ′, j ′,... are formed in a lattice pattern, but the present invention is not limited to this, and may be formed in the above-described staggered pattern.
  • a roll mechanism 13 ′ as shown in FIGS. 11A and 11B can be exemplified.
  • . 11A is a schematic front view of the roll mechanism 13 ′ viewed from the downstream side in the MD direction
  • FIG. 11B is a view taken along the line BB in FIG. 11A.
  • the roll mechanism 13 ′ has a pair of upper and lower rolls 13u ′ and 13d ′ that rotate about a rotation axis along the CD direction.
  • the upper roll 13u ′ has a large diameter portion 13m ′ and a small diameter portion 13v ′ alternately in the CD direction.
  • the lower roll 13d ′ also has a large diameter portion 13m ′ and a small diameter portion 13v ′ in the CD direction.
  • These rolls 13u ′ and 13d ′ are arranged one above the other while inserting their own large diameter portion 13m ′ in the space near the counterpart small diameter portion 13v ′, thereby rotating the rolls 13u ′ and 13d ′.
  • the large diameter portions 13m 'and 13m' are meshed with each other in the direction Ab.
  • the low extensible sheet 9a is passed along the MD direction between the rolls 13u ′ and 13d ′.
  • the low-extensible sheet 9a that is passing is between the large-diameter portions 13m ′ and 13m ′ adjacent to each other in the one roll 13u ′ (13d ′) and between the large-diameter portions 13m ′ and 13m ′. It is deformed into a three-point bend by the large diameter portion 13m ′ of the other roll 13d ′ (13u ′) entering the small diameter portion 13v ′. At this time, the portion 9a2 ′ that comes into contact with the top surface of the large-diameter portion 13m ′ of one roll 13u ′ (13d ′) in the low-extension sheet 9a ′ is in contact with the top surface so as to be relatively unmovable.
  • the second portion 9a2 ′ is substantially unstretched, and the portion 9a2 is in contact with the top surface of the large-diameter portion 13m ′ of the other roll 13d ′ (13u ′) in the sheet 9a ′.
  • 'Also comes into contact with the top surface so as not to be relatively movable, and thereby becomes the above-described second portion 9a2' without being generally stretched.
  • the portion 9a1 ′ between the two second portions 9a2 ′ and 9a2 ′ is stretched based on the entry of the large-diameter portion 13m ′, whereby the portion 9a1 ′ 1 portion 9a1 ′.
  • 1st part 9a1 'and 2nd part 9a2' are alternately formed in CD direction in low extensible sheet
  • the peak portion 13m of the corrugated roll 13u is cut out at a predetermined position Pk in the CD direction, as shown in FIG. 7, for the purpose of suppressing the development of stretchability of the low-extension sheet 9a.
  • a configuration similar to this may be applied to the roll mechanism 13 ′ of FIGS. 11A and 11B. That is, as shown in FIG.
  • each large-diameter portion 13m ′ of at least one roll 13u ′ of the pair of rolls 13u ′ and 13d ′ is cut out at a predetermined position Pk ′ in the rotation direction, thereby
  • the portion 13m ′ may be provided discontinuously.
  • the large-diameter portion 13m ′ does not exist at the predetermined position Pk ′, the above-described three-point bending-shaped stretching process is not performed at the position Pk ′, and thus at least the position Pk.
  • the expression of elasticity is suppressed.
  • the expression of stretchability in the CD direction of the low stretch sheet 9a ′ is suppressed as a whole.
  • the widening device has a pair of rollers provided corresponding to each end of the stretchable sheet 8a in the CD direction, and each roller abuts its outer peripheral surface against the stretchable sheet 8a.
  • the sheet 8a is driven to rotate so as to be sent to the downstream side in the MD direction.
  • the rotation direction of each roller is slightly outward in the CD direction from the direction along the MD direction. Therefore, when passing the position of each roller, the sheet 8a is pulled to both sides in the CD direction by each roller, and thereby the sheet 8a is extended to both sides in the CD direction.
  • the exterior sheet contraction processing unit 30 has the pair of nip roll mechanisms 31 and 33 as the mechanism for contracting the first expanded exterior sheet 7 a.
  • the mechanism is not limited to this as long as the mechanism can contract the sheet 7a.
  • a pair of S hanging roll mechanisms 31 'and 33' as shown in FIG. 12 may be provided instead of the pair of nip roll mechanisms 31 and 33. That is, each S-hanging roll mechanism 31 ′ (33 ′) is a pair of rolls 31u ′ and 31u ′ (33u ′ and 33d ′) that are driven and rotated around the rotation axis along the CD direction with their outer peripheral surfaces facing each other.
  • the exterior sheet 7a is hung around the pair of rolls 31u ′, 31d ′ (33u ′, 33d ′) in an S shape. Therefore, according to such a configuration, the outer sheet 7a can be held on the outer peripheral surface of each roll 31u ′, 31d ′ (33u ′, 33d ′) with almost no relative slip, and these rolls 31u ′, 31d ′ (33u) can be held. Based on the drive rotation of ', 33d'), the sheet 7a can be transported using the peripheral speed values of the rolls 31u ', 31d' (33u ', 33d') as the transport speed value of the exterior sheet 7a.
  • the S hanging roll mechanisms 31 ′ and 33 ′ can be used in place of the nip roll mechanisms 31 and 33 described above.
  • both of the pair of nip roll mechanisms 31 and 33 are replaced with S hanging roll mechanisms 31 ′ and 33 ′, respectively, but depending on the case, only one of the nip roll mechanisms 31 (33) is used. May be replaced with the S hanging roll mechanism 31 (33).

Abstract

La présente invention concerne un procédé de production d'une feuille composite destinée à un article absorbant et qui comprend une feuille élastique et une feuille à faible étirabilité qui a une étirabilité inférieure à celle de la feuille élastique. Le procédé comprend les étapes consistant à : préparer une feuille à faible étirabilité qui est formée par alignement mutuel dans une direction prescrite d'une première section qui est déployée dans la direction prescrite et d'une seconde section qui n'est pas déployée jusqu'à la première section; et fixer la feuille élastique à la feuille à faible étirabilité par l'intermédiaire d'une pluralité de parties jointes, tandis que la feuille élastique est étirée dans une direction élastique, la direction élastique étant agencée dans la direction prescrite. Relativement à la fixation, la pluralité de parties assemblées sont prévues de manière à être réparties de façon discontinue à la fois dans la direction élastique et dans une direction qui coupe la direction élastique, et sont disposées de telle sorte qu'au moins l'une de chacune d'une position centrale dans la direction prescrite de la première section et d'une position centrale dans la direction prescrite de la seconde section est incluse dans une partie non jointe qui est positionnée entre les parties jointes qui, parmi la pluralité de parties jointes, sont adjacentes dans la direction élastique.
PCT/JP2015/051386 2014-04-28 2015-01-20 Procédé de production d'une feuille composite pour article absorbant, et dispositif de fabrication WO2015166672A1 (fr)

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JP2014092664A JP5830570B2 (ja) 2014-04-28 2014-04-28 吸収性物品に係る複合シートの製造方法、及び製造装置
JP2014-092664 2014-04-28

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US9775749B2 (en) * 2015-02-04 2017-10-03 The Procter & Gamble Company Apparatuses and methods for transferring and bonding substrates
US11540954B2 (en) * 2018-01-31 2023-01-03 Zuiko Corporation Elastic composite sheet manufacturing method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07213554A (ja) * 1994-02-04 1995-08-15 New Oji Paper Co Ltd シート状弾性複合体の製造方法
JPH10245757A (ja) * 1997-02-25 1998-09-14 Kuraray Co Ltd シート状弾性複合体とその製造方法
WO2006073975A1 (fr) * 2004-12-30 2006-07-13 Kimberly-Clark Worldwide, Inc. Stratifies extensibles et etirables avec une tension transversale comparativement faible et procedes de fabrication idoine
WO2008066007A1 (fr) * 2006-11-27 2008-06-05 Uni-Charm Corporation Article absorbant et voile composite
JP2011214201A (ja) * 2010-03-31 2011-10-27 Unicharm Corp 弾性不織布およびその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07213554A (ja) * 1994-02-04 1995-08-15 New Oji Paper Co Ltd シート状弾性複合体の製造方法
JPH10245757A (ja) * 1997-02-25 1998-09-14 Kuraray Co Ltd シート状弾性複合体とその製造方法
WO2006073975A1 (fr) * 2004-12-30 2006-07-13 Kimberly-Clark Worldwide, Inc. Stratifies extensibles et etirables avec une tension transversale comparativement faible et procedes de fabrication idoine
WO2008066007A1 (fr) * 2006-11-27 2008-06-05 Uni-Charm Corporation Article absorbant et voile composite
JP2011214201A (ja) * 2010-03-31 2011-10-27 Unicharm Corp 弾性不織布およびその製造方法

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TW201609060A (zh) 2016-03-16

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