WO2015129367A1 - Production method for absorbent body - Google Patents

Production method for absorbent body Download PDF

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Publication number
WO2015129367A1
WO2015129367A1 PCT/JP2015/052149 JP2015052149W WO2015129367A1 WO 2015129367 A1 WO2015129367 A1 WO 2015129367A1 JP 2015052149 W JP2015052149 W JP 2015052149W WO 2015129367 A1 WO2015129367 A1 WO 2015129367A1
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WO
WIPO (PCT)
Prior art keywords
slit
absorber
absorbent
absorbent body
precursor
Prior art date
Application number
PCT/JP2015/052149
Other languages
French (fr)
Japanese (ja)
Inventor
将吾 奥
松永　竜二
康宏 中野
剛大 石川
Original Assignee
花王株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to CN201580008713.5A priority Critical patent/CN106029025B/en
Publication of WO2015129367A1 publication Critical patent/WO2015129367A1/en

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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
    • A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
    • A61F13/15642—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres by depositing continuous layers or pads of fibrous material on single sheets or 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
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/531—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 absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—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 absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A61F13/533—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 absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having discontinuous areas of compression
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/53409—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 absorbing medium having an inhomogeneous composition through the thickness of the pad having a folded core

Definitions

  • This invention relates to the manufacturing method of the absorber used for an absorbent article.
  • Patent Document 1 describes an absorber in which a large number of through holes penetrating the back surface are formed on the absorber surface.
  • the absorber surface is formed by disposing a hole forming roll having a large number of protrusions on the roll surface and an anvil roll having a recess at a position corresponding to the protrusions, and allowing the absorber to pass between both rolls. It is manufactured by forming a through-hole.
  • Patent Document 2 an elastic body that is fixed to the absorber side in the central region in the short direction of the product and applies a contracting force with respect to the arrangement direction, and an absorber in the vicinity of a region where the contracting action of the elastic body works.
  • Absorbent products having slits formed are described.
  • This slit uses a roller cutter provided with blades arranged parallel to each other on the outer periphery of the roller, or is provided with blades arranged non-parallel so as to approach and separate from each other on the outer periphery of the roller. It is formed by using a roller cutter.
  • the present invention is a method for producing an absorber having a slit by making an incision in the thickness direction of the absorber precursor while conveying the absorber precursor in one direction.
  • the absorber precursor is sandwiched between a cutter roll having a cutting blade on the peripheral surface and an anvil roll that receives the cutting blade of the cutter roll, and the absorber is cut along the thickness direction of the absorber precursor.
  • a softening step of softening the compressed portion by deforming.
  • FIG.1 (a) is a top view which shows the skin opposing surface side (surface sheet side) of the sanitary napkin as an example of the absorbent article provided with the absorber manufactured according to this invention
  • FIG.1 (b) FIG. 3 is an extraction plan view showing only the absorbent body of the sanitary napkin.
  • FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG.
  • FIG. 3 is a perspective view schematically showing an apparatus used for manufacturing the absorbent body shown in FIG.
  • FIG. 4 is an enlarged cross-sectional view showing the main part of the cutter roll in the apparatus shown in FIG.
  • FIG. 5 is a schematic view of the apparatus shown in FIG. 3 as viewed from the side.
  • FIG. 6 is a schematic diagram (corresponding to FIG.
  • FIG. 8A to FIG. 8D are schematic views showing the arrangement of the winding portions of the bending means in the embodiment.
  • the present inventors use a slitting device having a cutter roll having a cutting blade on the peripheral surface and an anvil roll that receives the cutting blade of the cutter roll to push the slit into the absorber. It was found that when the width of the cutting blade is widened from the viewpoint of durability or the like, a compressed portion is easily formed around the slit. If such a compressed portion exists around the slit of the absorbent body, the rigidity around the slit increases, and the advantages of providing the slit in the absorbent body may not be fully exhibited.
  • an object of the present invention relates to an absorber manufacturing method and a manufacturing apparatus that can eliminate the above-described drawbacks of the prior art.
  • the sanitary napkin 1 which is an example of the absorbent article which has the absorber manufactured by this invention is demonstrated.
  • the sanitary napkin 1 includes a liquid-retaining absorbent body 4, a surface sheet 2 disposed on the skin facing surface side of the absorbent body 4, and a non-skin facing surface of the absorbent body 4. It has an absorptive main body 5 having a back sheet 3 disposed on the side, and has a longitudinal direction X corresponding to the wearer's front-rear direction and a lateral direction Y orthogonal thereto.
  • a skin opposing surface is a surface which faces a wearer's skin side at the time of wear of an absorbent article in an absorbent article or its structural member (for example, absorbent main body 5), and is a non-skin opposing surface Is the surface of the absorbent article or its component that is directed to the side opposite to the skin side (clothing side) when the absorbent article is worn.
  • the longitudinal direction X coincides with the longitudinal direction of the absorbent article (absorbent body, absorbent body), and the lateral direction Y is perpendicular to the width direction (longitudinal direction) of the absorbent article (absorbent body, absorbent body).
  • the absorptive main body 5 is disposed on the abdomen (front side) of the wearer relative to the excretion part facing part B disposed opposite to the wearer's liquid excretion part (such as the vaginal opening) when worn and the excretion part facing part B when worn.
  • the front portion A and the rear portion C arranged on the back side (rear side) of the wearer rather than the excretory portion facing portion B at the time of wearing are provided in the vertical direction X.
  • the napkin 1 further includes a pair of wing portions 7, 7 extending outward in the lateral direction Y from both side portions along the vertical direction X of the excretory portion facing portion B of the absorbent main body 5. have.
  • the top sheet 2 covers the whole area of the skin-facing surface of the absorbent body 4 and further extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4.
  • the back sheet 3 covers the entire area of the non-skin facing surface of the absorbent body 4 and further extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4 to be described later.
  • a side flap portion 6 is formed.
  • the back sheet 3 and the side sheet 10 are joined to each other by known joining means such as an adhesive, heat seal, ultrasonic seal, and the like at the extended portions from both side edges along the longitudinal direction X of the absorber 4.
  • the top sheet 2 and the back sheet 3 may be bonded to the absorber 4 with an adhesive.
  • the absorbent body 4 has a laminated structure in which a main body absorbent sheet 401 and a central absorbent sheet 402 are laminated as shown in FIG. 2, and as shown in FIGS. B has a multilayer portion 42.
  • the multilayer part 42 is a part where the number of laminated absorbent sheets 401 and 402 constituting the absorbent body 4 is larger than the part located around the multilayered part 42.
  • the multilayer part 42 in this embodiment is thicker than the part located in the circumference
  • the absorbent body 4 includes a main absorbent body 40 that forms the outer shape of the absorbent body 4, and an auxiliary absorbent body 41 that is smaller than the main absorbent body 40 that is arranged on a part of the main absorbent body 40. Yes.
  • the auxiliary absorber 41 is located at least in the excretory part facing part B.
  • the absorbent body 4 is preferably composed only of a laminated structure of absorbent sheets 401 and 402.
  • the absorbent body 4 has a thin thickness, a high absorbent capacity, stability of folding processing, and freedom of shape deformation. From the point of view, it is preferable to use an absorbent sheet in which particles of a superabsorbent polymer are held between fiber layers.
  • the main absorbent body 40 has a folded structure of a main body absorbent sheet 401 containing pulp. Specifically, the main absorbent body 40 is formed by folding the main body absorbent sheet 401 inwardly at positions of folding lines 401 a and 401 b extending along the vertical direction X. That is, the main body absorbent sheet 401 is folded at both ends. At this time, the positions of the folding lines 401a and 401b are adjusted so that the inwardly folded portions of the main body absorbent sheet 401 partially overlap each other. Therefore, the main absorbent body 40 has a laminated structure of two layers and three layers made of the main body absorbent sheet 401.
  • the auxiliary absorbent body 41 has a folded structure of the central absorbent sheet 402 containing pulp. Specifically, the auxiliary absorbent body 41 folds the central absorbent sheet 402 inward along a fold line 402a extending along the longitudinal direction X at a portion located outward from the fold line 402a. Next, along the fold line 402b, the part located outward from the fold line 402b is folded inward toward the part that is folded first.
  • the fold lines 402a and 402b are formed at positions that divide the length in the lateral direction Y of the central absorbent sheet 402 into approximately three equal parts. As a result, the central absorbent sheet 402 is in a folded state with three windings. Therefore, the auxiliary absorbent body 41 has a three-layer structure composed of the central absorbent sheet 402.
  • the central absorbent sheet 402 that is in a folded state with three windings is disposed inside the main body absorbent sheet 401 that is in a folded state with both ends folded. That is, the main body absorbent sheet 401 and the central absorbent sheet 402 have a nested folding structure. As a result, in the laminated structure of the main body absorbent sheet 401 and the central absorbent sheet 402, it extends outward from at least a part of the peripheral edge of the central absorbent sheet 402, specifically from the entire region of the peripheral edge. A main body absorbent sheet 401 is laminated.
  • the center absorbent sheet 402 which comprises this auxiliary
  • Each layer of the absorbent sheet laminated in five layers in the multilayer portion 42 and three layers in the portions other than the multilayer portion 42 is an “absorbent layer” in the present invention.
  • the main absorbent body 40 having a folded structure of the main body absorbent sheet 401 has a substantially rectangular shape with rounded corners in plan view, and extends from the front part A to the rear part C via the excretory part facing part B.
  • the auxiliary absorbent body 41 having a folded structure of the central absorbent sheet 402 has a substantially rectangular shape in plan view, and is arranged from the excretory part facing part B to the rear part C in the vicinity thereof.
  • the auxiliary absorbent body 41 is laminated on the skin facing surface side of the main body absorbent sheet 401 constituting the main absorbent body 40, instead of being disposed inside the main absorbent body 40 composed of the folded main body absorbent sheet 401. Alternatively, it may be laminated on the non-skin facing surface side.
  • a pair of side sheets 10, 10 are arranged over substantially the entire length in the longitudinal direction X of the absorbent main body 5.
  • the pair of side sheets 10 and 10 are each a linear first joining line 11 located in the excretory part facing part B, and the longitudinal direction X of the first joining line 11 (front part A and rear part C). It joins to the absorptive main body 5 (surface sheet 2) with the linear 2nd joining line 12 located in this.
  • the first joining line 11 has a curved shape that protrudes outward in the lateral direction Y in plan view
  • the second joining line 12 has a linear shape (zigzag line shape) that extends in the longitudinal direction in plan view.
  • the side sheet 10 is made of a water-repellent nonwoven fabric.
  • the side flap portions 6 project greatly outward in the lateral direction Y at the excretory portion-facing portion B, whereby a pair of side flap portions 6 are provided on both the left and right sides along the longitudinal direction X of the absorbent main body 5.
  • the wing portions 7, 7 are extended.
  • the top sheet 2 and the back sheet 3 extend outward in the longitudinal direction X from the front end and the rear end in the longitudinal direction X of the absorbent body 4.
  • the end seal portion is formed by bonding to each other by a known bonding means such as an agent, heat sealing, ultrasonic sealing or the like.
  • the wing part 7 is used by being folded back to the non-skin facing surface side of the crotch part of clothes such as shorts.
  • the wing portion 7 has a substantially trapezoidal shape in which a lower base (a side longer than the upper base) is positioned on the side of the absorbent main body 5 in a plan view.
  • a wing part adhesive part (not shown) for fixing the wing part 7 (napkin 1) to clothing (not shown) such as shorts is formed.
  • the wing portion 7 that is folded back to the non-skin facing surface (outer surface) side of the crotch portion of the clothes can be adhered and fixed to the crotch portion by the adhesive portion.
  • the main body adhesion part (not shown) for fixing the absorptive main body 5 to clothes, such as shorts, is also formed in the non-skin opposing surface of the absorptive main body 5.
  • the boundary line between the absorbent main body 5 and the wing portion 7 is a straight line (not shown) that connects the roots in the longitudinal direction X of the wing portion 7.
  • the surface sheet 2 and the absorber 4 are dented integrally on the skin opposing surface (skin opposing surface of the surface sheet 2) of the absorptive main body 5 toward the back surface sheet 3 side.
  • the linear groove is formed so as to extend in the horizontal direction Y in the vertical groove 51 extending in the vertical direction X in the excretory part facing part B and in the front part A and the rear part C, respectively.
  • the first and second lateral grooves 52 and 53 are formed.
  • channel can be formed in accordance with a conventional method by embossing, such as a pressing process (what is called embossing) with or without heat (what is called embossing), or ultrasonic embossing.
  • the surface sheet 2 and the absorber 4 are not shown in the figure, but are bonded by an adhesive or integrated by thermal fusion or the like.
  • the absorbent body 4 is formed with a plurality of longitudinal slits 43 along the longitudinal direction X dispersed in the excretory part facing part B.
  • the vertical slits 43 are formed in a state of being distributed in both the vertical direction X and the horizontal direction Y.
  • the vertical slit 43 is formed by cutting the absorber 4 in the thickness direction, and penetrates the laminated structure of the absorbent sheets 401 and 402 constituting the absorber 4. It is preferable.
  • the vertical slits 43 are preferably not formed in the top sheet 2 and the back sheet 3 disposed above and below the absorber 4.
  • Each vertical slit 43 is individually independent, and a non-slit portion 43 ′ is located between adjacent vertical slits 43.
  • Each vertical slit 43 is surrounded by a non-slit portion 43 ′ around the entire periphery.
  • the vertical slit 43 is formed by cutting the absorber 4 in the thickness direction, and is formed from a cut having substantially no width, or preferably 1.5 mm. It has the following narrow space.
  • the width means the length of the vertical slit 43 in a direction orthogonal to the direction in which the vertical slit 43 extends.
  • the absorbent body 4 has a plurality of rear slits 45 extending in the rear part C located behind the excretory part facing part B so as to have a longitudinal direction in a direction intersecting the longitudinal direction X of the napkin 1.
  • the rear slit 45 is a plane in which the position of the central portion 45a in the longitudinal direction of the slit 45 is located on the front portion A side with respect to the positions of both end portions 45b and 45b in the longitudinal direction. It has a view shape, and more preferably has a plan view shape that is convexly curved toward the front portion A side.
  • the back slit 45 is formed in multiple numbers at intervals in the longitudinal direction X of the absorbent article.
  • FIG. 3 schematically shows an apparatus for manufacturing the absorbent body 4 in the sanitary napkin 1 described above.
  • the absorbent body of the sanitary napkin 1 described above or the slit forming step using the cutting device 60 and the softening step using the softening means 70 are used.
  • the continuous body 4 is manufactured.
  • the cutting device 60 used in the slit forming step includes a cutter roll 61 having cutting blades 63 and 64 on the peripheral surface, and an anvil roll 62 that receives the cutting blades 63 and 64 of the cutter roll 61.
  • the cutting blades 63 are cutting blades for forming the vertical slits 43, and a plurality of cutting blades 63 are formed in the circumferential direction and the axial length direction of the cutter roll 61.
  • the cutting blade 64 is a cutting blade for forming the rear slit 45, and a plurality of cutting blades 64 are formed at intervals in the circumferential direction of the cutter roll 61.
  • the cutter roll 61 and the anvil roll 62 are arranged so that their axial centers 61 'and 62' are parallel to each other. A clearance is provided between the cutter roll 61 and the anvil roll 62, or both rolls are in contact with each other.
  • the cutting blades 63 and 64 positioned on the peripheral surface of the cutter roll 61 are formed and arranged so as to coincide with the shape and arrangement of the slits 43 and 45 formed in the target absorbent body 4.
  • An absorber precursor 4a (hereinafter also referred to as “precursor 4a” for the sake of simplicity), which is a precursor of an absorbent body having a laminated structure of a main body absorbent sheet and a central absorbent sheet, is shown by an arrow R in FIG. And is supplied between the cutter roll 61 and the anvil roll 62 in the cutting device 60.
  • the state of the cross section in the thickness direction of the precursor 4a before being supplied between the two rolls 61 and 62 is shown in a circle indicated by I in FIG. In the precursor 4a before being supplied between the two rolls 61 and 62, the absorbent sheets 401 and 402 are not joined.
  • the cutting blade 63 provided on the peripheral surface of the cutter roll 61 by the sandwiching pressure by the both rolls 61 and 62 extends along the thickness direction of the precursor 4a. Proceeds into the precursor 4a. Thereby, the vertical slit 43 and the back slit 45 are formed in the precursor 4a.
  • the state of the cross section in the thickness direction of the precursor 4a after the vertical slit 43 is formed is shown in a circle indicated by II in FIG.
  • the respective absorbent sheets 401 and 402 are consolidated due to the progress of the cutting blade 63, so that the absorbent sheets 401 and 402 (absorption absorbed) stacked around the vertical slit 43.
  • a pressure-bonding portion 43a (squeezed portion) between the layers is formed.
  • a crimping part 43a (pressing part) in which the laminated absorbent sheets 401 and 402 (absorbing layers) are crimped is also formed around the rear slit 45.
  • surroundings may have the crimping
  • FIG. 4 shows an enlarged cross-sectional view of the tip portion of the cutting blade 63 provided in the cutter roll 61.
  • the left-right direction of the paper surface in the figure coincides with the axial direction of the cutter roll 61.
  • the direction orthogonal to the paper surface in the figure is a direction parallel to the conveyance direction of the precursor 4a.
  • the cutting blade 63 has its tip angle changed in two stages. Specifically, the cutting blade 63 forms a first tip angle ⁇ 1 by two hypotenuses L1, L1 at the most tip position. Further, the cutting blade 63 is at a position slightly closer to the base from the position of the most distal end (above the cutting blade 63 in FIG.
  • the first tip angle ⁇ 1 is larger than the second tip angle ⁇ 2.
  • the first tip angle ⁇ 1 is preferably 40 degrees or more, particularly 60 degrees or more, and preferably 100 degrees or less, particularly 90 degrees or less.
  • the first tip angle ⁇ 1 is preferably 40 degrees or more and 100 degrees or less, and particularly preferably 60 degrees or more and 90 degrees or less.
  • the second tip angle ⁇ 2 is smaller than the first tip angle ⁇ 1, it is preferably 30 degrees or more, particularly 50 degrees or more, and preferably 90 degrees or less, particularly 70 degrees or less.
  • the second tip angle ⁇ 2 is preferably 30 degrees or greater and 90 degrees or less, and particularly preferably 50 degrees or greater and 70 degrees or less.
  • the absorber precursor 4 ′ in which the slits 43 and 45 are formed in the slit forming process (hereinafter, also referred to as “precursor with slit 4 ′” for the sake of simplicity).
  • the softening process is performed using the softening means 70 including one roll 71 (winding portion).
  • the 1st roll 71 is a winding part which can wind the precursor 4 'with a slit.
  • “winding” means that the precursor 4 ′ with slit is not in contact with the first roll 71 at a point when viewed from the axial direction of the first roll 71, but on the peripheral surface of the first roll 71. A state of contact along the line. That is, it means that the precursor 4 ′ with slit is conveyed to the first roll 71 while having a certain holding angle.
  • the softening means 70 in the present embodiment includes, in addition to the first roll 71, a second roll 72 disposed on the upstream side in the conveying direction of the precursor 4 ′ with slit. And a third roll 73 disposed on the downstream side in the transport direction.
  • the first to third rolls 71 to 73 are arranged such that their axis centers 71 ′, 72 ′, and 73 ′ are parallel to each other. Further, a clearance is provided between the first roll 71 and the second roll 72, and a clearance is also provided between the second roll 72 and the third roll 73.
  • Each of the first to third rolls is a flat roll having a flat surface.
  • the first roll 71 is disposed so that a part of the first roll 71 enters the space between the second roll 72 and the third roll 73, and more specifically, the lower half of the roll 71. Has entered.
  • transformed into circular arc shape other than a roll are mentioned.
  • the slitted precursor 4 ′ to be softened by the softening means 70 is transported by a known transport means (not shown) such as a belt conveyor, and as shown in FIG. After being introduced onto the circumferential surface of the first roll 71 and then onto the circumferential surface of the third roll 73, the circumferential surface of the third roll 73. Then, it is transferred to a known conveying means (not shown) such as a belt conveyor and further conveyed downstream. As shown in FIG. 5, the slit-attached precursor 4 ′ is deformed into a circular arc shape that is convex toward the first surface “a” on the peripheral surface of the second roll 72.
  • the slitted precursor 4 ′ passes through the first to third rolls 71 to 73 while being deformed into a shape along the peripheral surfaces of the first to third rolls 71 to 73.
  • the first to third rolls 71 to 73 themselves may be drive rolls provided with drive means (not shown) such as a servo motor, or may be free rolls that do not have drive. good.
  • a drive roll (not shown) is provided in the immediate vicinity of the downstream side of the third roll 73 so that the transportability of the slitted precursor 4 ′ is not impaired by the winding by the first to third rolls 71 to 73.
  • a circle indicated by III represents the state of the cross section in the thickness direction of the absorbent body 4 after the flexible processing by the first to third rolls 71 to 73.
  • the precursor 4 ′ with slit is conveyed while being sequentially deformed into shapes along the peripheral surfaces of the second roll 72, the first roll 73, and the third roll 73.
  • the absorbent sheets 401 and 402 (absorbing layers) that have been bonded to each other are peeled off and separated, and the absorbent sheets 401 and 402 return to the non-bonded state before the slit is formed.
  • the continuous body 4 of the target absorbent body in which the crimping part 43a (pressing part) formed around the slits 43 and 45 is softened can be successfully obtained.
  • the continuous body 4 of the absorbent body is cut to the size of the absorbent body of the individual absorbent article by a known cutting means to become the absorbent body 4 having the dimensions of the absorbent body of the sanitary napkin 1 described above.
  • the first surface a is a surface located on the cutter roll 61 side during slit formation
  • the second surface b is a surface located on the anvil roll 62 side during slit formation. is there.
  • the winding portion of the bending means used in the present invention may be such that, as with the first roll 71, the precursor 4 ′ with slit is curved toward the first surface a side, and the second and second 3, the slit precursor 4 ′ may be curved to the second surface b side, but the bending means used in the present invention is the slit precursor 4 ′.
  • a roll (winding portion) that is bent toward the first surface a side and a roll (winding portion) that is bent toward the second surface b side and the bending processing means 70 used in this embodiment.
  • a total of three rolls that is, two rolls (winding portions) that bend the precursor 4 ′ with slits to the one surface a side and one roll (winding portion) that bends to the other surface b side. More preferably, the above rolls are provided.
  • the precursor 4 ′ with slit in the portion delivered from the second roll 72 to the first roll 71, has a cross-sectional shape along the transport direction R. Even in a portion that is bent so as to form an S shape and is transferred from the first roll 71 to the third roll 73, the cross-sectional shape of the precursor 4 ′ with slits along the transport direction R is S. It is bent to form a letter shape.
  • the slit precursor 4 ′ is preferably bent so that a length of 100 cm or less in the conveying direction forms an S shape in a portion that is transferred from roll to roll. Note that the S-shape referred to in this specification includes an inverted S-shape in which left and right are reversed.
  • the holding angle ⁇ 11 of the first roll 71 having the largest holding angle of the precursor 4 ′ with slit is preferably 10 degrees or more, more preferably 40 degrees or more. Also, it is preferably 180 degrees or less, more preferably 90 degrees or less, and preferably 10 degrees or more and 180 degrees or less, more preferably 40 degrees or more and 90 degrees or less.
  • the holding angle of the precursor 4 ′ with slit in the first roll 71 is the cross section obtained by cutting the first roll 71 and the precursor 4 ′ with slit in a plane orthogonal to the axis 71 ′ of the roll.
  • the radius of the first roll 71 is preferably 10 mm or more, more preferably 15 mm or more, preferably 50 mm or less, more preferably 20 mm or less, and preferably 10 mm or more and 50 mm or less, more preferably It is 15 mm or more and 20 mm or less.
  • Each of the second roll 72 and the third roll 73 has a holding angle ⁇ 12, ⁇ 13 of the precursor 4 ′ with a slit of preferably 10 degrees or more, more preferably 20 degrees or more, and preferably 180 degrees. Hereinafter, it is more preferably 45 degrees or less, preferably 10 degrees or more and 180 degrees or less, more preferably 20 degrees or more and 45 degrees or less.
  • the second roll 71 and the third roll 73 each have a radius of preferably 10 mm or more, more preferably 15 mm or more, and preferably 50 mm or less, more preferably 20 mm or less. Is from 10 mm to 50 mm, more preferably from 15 mm to 20 mm.
  • the first to third rolls 71 to 73 have a radius of at least one roll in the conveying direction of the slit-formed precursor 4 ′ from the viewpoint of softening the compressed portion around the slit 43.
  • the radius of two or more rolls is preferably 4 times or less of the length of the slit 43, and the radius of all the rolls is less than 4 times the length of the slit 43.
  • the length is preferably 4 times or less of the length.
  • the length of the slit here is the total length in the longitudinal direction of the slit when the slit is formed in parallel with the transport direction like the slit 43 shown in FIG. 3, and the slit is parallel to the transport direction. If it is not formed, the length in the conveyance direction between the front edge and the rear edge of the slit in the conveyance direction is set.
  • the slit to be softened in the softening step has a length in the transport direction defined as described above of preferably 2 mm or more, more preferably 5 mm or more, and preferably 100 mm or less, more preferably 50 mm or less, Further, it is preferably 2 mm or more and 100 mm or less, more preferably 5 mm or more and 50 mm or less. Note that the radius of curvature when the winding portion is a cylindrical roll is the same as the radius of the roll.
  • the winding portion is not a roll
  • the winding portion is a portion of the belt conveyor that is bent by the roll and deformed into a cross-section arc shape
  • the belt deformed into the cross-section arc shape it is preferable that the curvature radius of is 4 times or less the length in the conveyance direction of the precursor 4 ′ with slit.
  • the softening process in the present invention can provide a further excellent softening effect for the slits formed in a straight line extending in the transport direction.
  • FIG. 6 is a diagram showing another embodiment of the present invention.
  • the cutter roll 81 having the cutting blade 83 is formed after the slit precursor 4 ′ is formed from the absorber precursor 4 ⁇ / b> A using the cutting device 60 having the same configuration as the cutting device 60 described above.
  • an anvil roll 82 that receives the cutter blade 83 of the cutter roll, the slit-cured precursor 4 'is cut into the size of each absorber 4 and the single-wafer slit-cured precursor 4 is cut.
  • the first bend processing means 70A provided with a transfer roll 75 (winding portion) provided with a suction hole on the outer peripheral surface thereof is used for the single-wafer slit precursor 4 ′.
  • the transfer roll 75 is separated from the outer peripheral surface in a range P3 from a position in front of the receiving portion P1 of the sheet precursor 4 ′ with slit to a position exceeding the delivery portion P2 to the belt conveyor 79. Suction is possible.
  • the sheet-shaped slit precursor 4 ′ is deformed into a shape along the peripheral surface of the transfer roll 75 while performing suction from the outer peripheral surface. Also with the precursor 4 ′, it is possible to efficiently soften the pressure-bonding portion 43a (squeezing portion) around the slit while preventing the precursor 4 ′ with slit from lifting from the outer peripheral surface of the roll.
  • the continuous sheet 76 having a strip shape is joined to the sheet-formed precursor 4 ′, and then the continuous sheet 76.
  • a second softening process is performed using the second bending means 70B on the laminated body 77 composed of the sheet-shaped precursor 4 ′ with slits intermittently arranged on one side of the continuous sheet 76. ing.
  • the second bending means 70B has the same configuration as the bending means 70 described above, except that the first roll 71A includes a suction mechanism. A plurality of suction holes are opened on the peripheral surface of the first roll 71A, and portions other than the opening are flat.
  • the first roll 71A has an intake passage that communicates the opening on the circumferential surface with the opening provided on the side surface, and the opening provided on the side surface and an arcuate suction device disposed opposite to the side surface While the two are overlapped, suction from the peripheral surface is performed. Also in the second softening step by the second bending means 70B, the laminated body 77 is shaped along the peripheral surface of the first roll 71A while performing suction from the peripheral surface of the first roll 71A. By deforming to the above, it is possible to efficiently soften the pressure-bonding portion 43a (pressing portion) around the slit in the single-sheet precursor 4 ′ with slit included in the laminate 77.
  • the slitting precursor 4 ′ is subjected to the softening step by the front end and the rear end in the conveying direction R of the sheet precursor 4 ′ with slits, and the cutting blade 64.
  • the attached rear slit 45 has an advantage of suppressing processing defects such as phase shift, bending, and kinking due to being caught by the second bending processing means 70B.
  • the suction range P4 of the first roll 71A is the same as the contact range of the precursor 4 ′ with slit, and it is possible to suck and hold only while the laminated body 77 is bent on the first roll 71A. This is preferable from the viewpoint of preventing the attached precursor 4 'from being lifted.
  • belt-shaped continuous sheet 76 the sheet
  • belt-shaped original fabric of the surface sheet which consists of a nonwoven fabric which has air permeability can be used.
  • the top sheet 2 and the back sheet 3 various materials conventionally used in the technical field can be used without any particular limitation.
  • the surface sheet 2 for example, liquid permeable sheets such as various nonwoven fabrics and perforated films subjected to a hydrophilic treatment can be used.
  • a liquid-impermeable material or a water-repellent material can be used.
  • the liquid-impermeable material a resin film, a resin film having fine pores and moisture permeability, a laminate material of a resin film and a nonwoven fabric, and the like can be used.
  • a superabsorbent polymer is sprayed on wet paper or nonwoven fabric, and the paper or nonwoven fabric is superimposed thereon, and then dried and integrated.
  • an absorbent sheet for example, an absorbent sheet described in JP-A-8-246395 can be used.
  • This absorbent sheet can be cut into a predetermined shape and used as a sheet-like absorber.
  • the thickness per absorbent sheet is preferably 0.1 mm or more, particularly 0.3 mm or more, and preferably 2 mm or less, particularly 1.5 mm or less. More specifically, it is preferably 0.1 mm or more and 2 mm or less, particularly preferably 0.3 mm or more and 1.5 mm or less.
  • the napkin 1 may not have the wing part 7.
  • you may have a back flap part which spreads and fixes to the inner surface of shorts in the both sides in the back part of the absorptive main body 5.
  • FIG. Further, only the longitudinal slit 43 may be formed in the absorber without forming the rear slit 45. Moreover, in the manufacturing method of the absorber shown in FIG.
  • the 1st softening process using the transfer roll 75 may be abbreviate
  • the second softening step may be omitted.
  • a slit inclined with respect to both the transport direction and the direction perpendicular thereto may be formed.
  • the absorber manufactured does not have the multilayer part 42, but the lamination
  • the number of laminated absorbent sheets in the multilayer portion 42 in the case where the multilayer portion 42 is provided is not limited to the number shown in FIG. 2, and the difference in the number of laminated absorbent sheets between the multilayer portion 42 and other portions is also illustrated. It is not limited to the number shown in 2.
  • the main body absorbent sheet 401 and the central absorbent sheet 402 constituting the absorbent body 4 are each folded to form a laminated structure composed of a plurality of layers.
  • a laminate of a plurality of absorbent sheets may be used.
  • the absorbent sheet can be folded in various ways.
  • the auxiliary absorbent body 41 has the central absorbent sheet 402 folded as shown in FIGS. 8 (a) to 8 (d). It may be folded.
  • the absorbent body to be manufactured in the present invention is not limited to such a form, and may be another form, for example, a pile pile of pulp fibers and a water-absorbing polymer. In this case, by passing through the first and / or second softening step, the pulp fibers in the crimping portion 43 are peeled apart and separated, and the distance between the pulp fibers is widened to obtain the effect of softening. .
  • this invention absorbs absorbers, such as a disposable diaper, an incontinence pad, a panty liner, etc. of other absorbent articles. The same applies to the manufacture of the body.
  • This invention discloses the manufacturing method and manufacturing apparatus of the following absorber further regarding embodiment mentioned above.
  • ⁇ 1> While conveying the absorber precursor in one direction, making a cut in the thickness direction of the absorber precursor, and manufacturing a absorber having a slit, The absorber precursor is sandwiched between a cutter roll having a cutting blade on the peripheral surface and an anvil roll that receives the cutting blade of the cutter roll, and the absorber is cut along the thickness direction of the absorber precursor.
  • the manufacturing method of an absorber which comprises the softening process which softens the said crimping
  • the absorber has a laminated structure having a plurality of absorption layers, In the slit forming step, as the pressure-bonding portion, a pressure-bonding portion in which a plurality of absorption layers are pressure-bonded is formed.
  • the softening step at least one absorption layer in the pressure-bonding portion is separated, and the pressure-bonding portion.
  • the bending means includes at least one roll as the winding portion, and the holding angle of the absorber precursor in which the slit is formed is 10 degrees or more and 180 degrees or less.
  • the winding portion has a plurality of suction holes on the surface, and deforms the absorber precursor in which the slit is formed while being held on the surface by suction. ⁇ 1> to ⁇ 3> The manufacturing method of the absorber of description.
  • the bending means includes a plurality of the winding portions and bends the absorber precursor in which the slit is formed into an S-shaped cross section.
  • the absorber precursor or the absorber has a multilayer portion at a portion disposed in the excretory portion facing portion of the absorbent article, and the multilayer portion is the number of laminated absorbent sheets constituting the absorber.
  • the multilayer portion is thicker than the portion located around it, and forms a raised portion that protrudes toward the topsheet side of the absorbent article at a portion disposed in the excretory part facing portion of the absorbent article.
  • ⁇ 8> The method for producing an absorbent body according to any one of ⁇ 1> to ⁇ 7>, wherein the absorbent body is composed only of a laminated structure of absorbent sheets.
  • the absorber precursor or the absorber is composed of an absorbent sheet having a single layer or a multilayer structure, and the absorbent sheet sprays a superabsorbent polymer on wet paper or non-woven fabric, on which paper
  • ⁇ 11> In the absorbent body precursor or the absorbent body, a plurality of longitudinal slits along the longitudinal direction X of the absorbent article are formed in a dispersed state at a portion disposed in the excretory part facing portion of the absorbent article. ⁇ 1>- ⁇ 10> The manufacturing method of the absorber as described in any one of ⁇ 10>. ⁇ 12> In the absorbent body precursor or the absorbent body, longitudinal slits along the longitudinal direction X of the absorbent article are formed in a state dispersed in both the longitudinal direction X and the transverse direction Y of the absorbent article, ⁇ 1> to ⁇ 10 The manufacturing method of the absorber of any one of>.
  • a longitudinal slit along the longitudinal direction X of the absorbent article is formed by cutting the absorber precursor in the thickness direction, and the longitudinal slit penetrates the laminated structure of the absorbent sheet constituting the absorber.
  • a plurality of longitudinal slits along the longitudinal direction X of the absorbent article are formed in the absorber precursor or the absorber, each longitudinal slit is individually independent, and between adjacent longitudinal slits
  • the absorbent body has a plurality of rear slits extending in the rear part located behind the excretory part facing part of the absorbent article so as to have a longitudinal direction in a direction intersecting the longitudinal direction of the absorbent article.
  • the rear slit has a shape in plan view in which the position of the central portion in the longitudinal direction of the slit is located closer to the front portion side of the absorbent article than the positions of both end portions in the longitudinal direction, preferably the front portion side
  • the manufacturing method of the absorber as described in ⁇ 15> which has the shape of planar view curved convex toward the surface.
  • the said back slit is a manufacturing method of the absorber as described in ⁇ 15> or ⁇ 16> currently formed in multiple numbers at intervals in the longitudinal direction X of an absorbent article.
  • the cutting blade has a first tip angle ⁇ 1 formed by two hypotenuses L1, L1 at the most tip position, and is connected to each hypotenuse L1 at a position slightly closer to the base from the tip end position.
  • ⁇ 1> to ⁇ 16> which has a second tip angle ⁇ 2 formed by the hypotenuses L2 and L2, and the first tip angle ⁇ 1 is larger than the second tip angle ⁇ 2.
  • the first tip angle ⁇ 1 is preferably 40 ° or more, particularly preferably 60 ° or more, and is preferably 100 ° or less, particularly preferably 90 ° or less, and the first tip angle ⁇ 1 is 40 ° or more and 100 ° or less,
  • the second tip angle ⁇ 2 is preferably 30 ° or more, particularly 50 ° or more, preferably 90 ° or less, particularly preferably 70 ° or less, provided that the second tip angle ⁇ 2 is smaller than the first tip angle ⁇ 1.
  • the surface located on the cutter roll side at the time of slit formation is the first surface a
  • the surface located on the anvil roll side at the time of slit formation is the second.
  • the bending means includes, as the winding portion, a roll that curves the precursor with slit to the first surface a side, or a roll that curves the second surface b side, Alternatively, the method for producing an absorbent body according to any one of ⁇ 1> to ⁇ 20>, comprising both a roll that is bent toward the first surface a and a roll that is bent toward the second surface b.
  • the precursor with slit which is the absorber precursor forming the slit
  • the surface located on the cutter roll side at the time of slit formation is the first surface a
  • the surface located on the anvil roll side at the time of slit formation is the second.
  • the bending processing means causes the precursor with a slit to bend to one surface side of the first surface a and the second surface b and to bend to the other surface side 1
  • ⁇ 23> The method for producing an absorbent body according to any one of ⁇ 1> to ⁇ 22>, wherein the slit has a length in the transport direction of the absorbent body precursor of 2 mm to 100 mm.
  • ⁇ 24> The method for manufacturing an absorbent body according to any one of ⁇ 1> to ⁇ 23>, wherein a radius of curvature of the winding portion is not more than four times the length of the slit in the transport direction of the absorbent body precursor.
  • ⁇ 25> The absorber according to any one of ⁇ 1> to ⁇ 24>, wherein an inter-axis distance of each roll of the winding portion is not more than four times the length of the slit in the transport direction of the absorber precursor. Manufacturing method.
  • ⁇ 26> The method for producing an absorbent body according to any one of ⁇ 1> to ⁇ 25>, wherein the absorbent body is an absorbent body of an absorbent article.
  • the absorbent article is a sanitary napkin, a disposable diaper, an incontinence pad, or a panty liner.
  • the said slit is not formed in the surface sheet and back surface sheet of an absorbent article which are distribute
  • a method for producing an absorbent article comprising a liquid-retaining absorbent body, a top sheet disposed on the skin facing surface side of the absorbent body, and a back sheet disposed on the non-skin facing surface side of the absorbent body, A method for producing an absorbent article, wherein the absorbent body is produced by the method according to any one of ⁇ 1> to ⁇ 28>.
  • Example 1 Using the following absorbent sheet (absorbing layer) as the absorbent sheets 401 and 402, a strip-shaped absorber precursor 4a having a cross-sectional structure shown in FIGS. 1 and 2 was produced.
  • the strip-shaped absorber precursor 4a was subjected to the formation of the vertical slits 43 and the softening process for the precursor with slits using the apparatus shown in FIGS. 3 and 5 to obtain an absorber with slits.
  • the diameters of the first to third rolls were all 37 mm, and the arrangement was as shown in Table 1 and FIG.
  • the length of the linear slit 43 extending in the conveying direction of the precursor with slit was 20 mm, and was a length corresponding to 1.08 times the radius (curvature radius) of each roll.
  • Absorbent sheet Cross-linked cellulose fiber, softwood pulp, and superabsorbent polymer supplied in an air stream were deposited at a weight ratio of 5: 2: 3, and then solidified with PVA (2.4% by weight) as an adhesive A dry sheet was used.
  • the main body absorbent sheet 401 has a basis weight of 75 g / m 2 and a thickness of 0.45 mm
  • the central absorbent sheet 402 has a basis weight of 80 g / m 2 and a thickness of 0.50 mm.
  • the basis weight was measured according to the method described in JIS-P8124, and the thickness was measured according to JIS-P8118: 1998.
  • Example 2 the thickness was measured using a peacock-made desk thickness gauge, and a thickness of 2.5 cm / cm 2 was measured by placing a 5 cm ⁇ 5 cm measuring plate.
  • Example 4 the arrangement of the first to third rolls was changed.
  • Example 4 the arrangement of the first to third rolls and the introduction position of the absorber precursor 4a to the first roll were changed. Except that, an absorber with a slit was obtained in the same manner as in Example 1.
  • Example 2 is shown in Table 1 and FIG. 8B
  • Example 3 is shown in Table 1 and FIG. 8C
  • Example 4 is shown in FIG. 1 and as shown in FIG.
  • the obtained absorbent body with a slit is placed on the support table of the handometer so that the longitudinal center of the multilayer portion of the absorbent body is located at the center of the concave groove, and the absorbent body in the width direction.
  • the bending stiffness when bent was evaluated.
  • an absorber having a flexible slit can be efficiently manufactured.

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Abstract

A method for producing an absorbent body (4) having slits (43, 45) as a result of having an absorbent body precursor (4a) being conveyed in a direction (R) and cuts being inserted in the thickness direction. The method has a step in which the absorbent body precursor (4a) is pressed between a cutter roll (61) having cutting blades (63, 64) on the peripheral surface thereof and an anvil roll (62), and slits (43, 45) are formed. A compressed section that sometimes forms around the slits is made flexible by winding and deforming the absorbent body precursor (4') having the slits (43, 45) formed therein on to a winding section (71) of a bending means (70).

Description

吸収体の製造方法Absorber manufacturing method
　本発明は、吸収性物品に用いられる吸収体の製造方法に関する。 This invention relates to the manufacturing method of the absorber used for an absorbent article.
　生理用ナプキンやパンティライナ、使い捨ておむつ等の吸収性物品に用いられる吸収体に、細幅のスリットないし溝を設け、該吸収性物品の各種の性能を向上させる技術が知られている。例えば特許文献１には、吸収体面に、裏面に貫通する多数の貫通穴を形成した吸収体が記載されている。この吸収体は、ロール表面に多数の突起を有する穴加工ロールと、突起に対応する位置に凹部を有するアンビルロールとを対向配置し、両ロールの間に吸収体を通過させることにより、吸収体面に貫通穴を形成することで製造される。 A technique is known in which narrow slits or grooves are provided in an absorbent body used for absorbent articles such as sanitary napkins, panty liners, and disposable diapers to improve various performances of the absorbent article. For example, Patent Document 1 describes an absorber in which a large number of through holes penetrating the back surface are formed on the absorber surface. The absorber surface is formed by disposing a hole forming roll having a large number of protrusions on the roll surface and an anvil roll having a recess at a position corresponding to the protrusions, and allowing the absorber to pass between both rolls. It is manufactured by forming a through-hole.
　特許文献２には、製品の短手方向の中央領域において、吸収体側に固定され、配置方向に関して収縮する力を付与する弾性体と、弾性体の収縮作用が働く領域の近傍において、吸収体に形成されたスリットとを有する吸収性製品が記載されている。このスリットは、ローラの外周に互いに平行に配置された刃が設けられているローラカッターを用いたり、あるいはローラの外周に互いに接近，離間するように非平行に配置された刃が設けられているローラカッターを用いたりすることで形成される。 In Patent Document 2, an elastic body that is fixed to the absorber side in the central region in the short direction of the product and applies a contracting force with respect to the arrangement direction, and an absorber in the vicinity of a region where the contracting action of the elastic body works. Absorbent products having slits formed are described. This slit uses a roller cutter provided with blades arranged parallel to each other on the outer periphery of the roller, or is provided with blades arranged non-parallel so as to approach and separate from each other on the outer periphery of the roller. It is formed by using a roller cutter.
特開２００２－０３５０３６号公報JP 2002-035036 A 特開２００４－１０５７２３号公報JP 2004-105723 A
　本発明は、吸収体前駆体を一方向に向けて搬送させながら、該吸収体前駆体の厚み方向に向けて切り込みを入れて、スリットを有する吸収体を製造する方法である。周面に切断刃を有するカッターロールと、該カッターロールの該切断刃を受けるアンビルロールとで吸収体前駆体を挟圧し、該切断刃を該吸収体前駆体の厚み方向に沿って該吸収体前駆体内に進行させることにより、該吸収体前駆体に周囲に圧搾部を有するスリットを形成するスリット形成工程と、前記スリットを形成した吸収体前駆体を、屈曲加工手段の巻き掛け部に巻き掛けて変形させることにより前記圧搾部を柔軟化させる柔軟化工程とを具備する。 The present invention is a method for producing an absorber having a slit by making an incision in the thickness direction of the absorber precursor while conveying the absorber precursor in one direction. The absorber precursor is sandwiched between a cutter roll having a cutting blade on the peripheral surface and an anvil roll that receives the cutting blade of the cutter roll, and the absorber is cut along the thickness direction of the absorber precursor. A slit forming step of forming a slit having a squeezed portion around the absorber precursor by being advanced into the precursor, and the absorber precursor having the slit formed thereon is wound around a winding portion of a bending means. And a softening step of softening the compressed portion by deforming.
図１（ａ）は、本発明に従い製造される吸収体を備えた吸収性物品の一例としての生理用ナプキンの肌対向面側（表面シート側）を示す平面図であり、図１（ｂ）は、その生理用ナプキンの吸収体のみを示す抽出平面図である。Fig.1 (a) is a top view which shows the skin opposing surface side (surface sheet side) of the sanitary napkin as an example of the absorbent article provided with the absorber manufactured according to this invention, FIG.1 (b) FIG. 3 is an extraction plan view showing only the absorbent body of the sanitary napkin. 図２は、図１のＩＩ－ＩＩ線模式的断面図である。FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG. 図３は、図１に示す吸収体を製造するために用いられる装置を模式的に示す斜視図である。FIG. 3 is a perspective view schematically showing an apparatus used for manufacturing the absorbent body shown in FIG. 図４は、図３に示す装置におけるカッターロールの要部を拡大して示す断面図である。FIG. 4 is an enlarged cross-sectional view showing the main part of the cutter roll in the apparatus shown in FIG. 図５は、図３に示す装置を側面から見た模式図である。FIG. 5 is a schematic view of the apparatus shown in FIG. 3 as viewed from the side. 図６は、図１に示す吸収体を製造するために用いられる別の装置を示す模式図（図５相当図）である。FIG. 6 is a schematic diagram (corresponding to FIG. 5) showing another apparatus used for manufacturing the absorbent body shown in FIG. 図７（ａ）ないし図７（ｄ）は、吸収性シートの折り畳み方の別の例を示す補助吸収体の模式断面図である。Fig.7 (a) thru | or FIG.7 (d) is a schematic cross section of the auxiliary | assistant absorber which shows another example of how to fold an absorbent sheet. 図８（ａ）ないし図８（ｄ）は、実施例における屈曲加工手段の巻き掛け部の配置を示す模式図である。FIG. 8A to FIG. 8D are schematic views showing the arrangement of the winding portions of the bending means in the embodiment.
　本発明者らは、上述した従来技術のように、周面に切断刃を有するカッターロールと、カッターロールの切断刃を受けるアンビルロールとを有するスリット加工装置を用いて、吸収体にスリットを押し切りで形成する場合、切断刃の幅を、その耐久性等の観点等から広めにすると、スリットの周囲に圧搾した部分が形成されやすいことを知見した。吸収体のスリットの周囲に、このような圧搾部分が存在すると、スリットの周囲の剛性が増加し、吸収体にスリットを設けたことによる利点が十分に発揮されない場合がある。 As in the prior art described above, the present inventors use a slitting device having a cutter roll having a cutting blade on the peripheral surface and an anvil roll that receives the cutting blade of the cutter roll to push the slit into the absorber. It was found that when the width of the cutting blade is widened from the viewpoint of durability or the like, a compressed portion is easily formed around the slit. If such a compressed portion exists around the slit of the absorbent body, the rigidity around the slit increases, and the advantages of providing the slit in the absorbent body may not be fully exhibited.
　したがって本発明の課題は、前述した従来技術が有する欠点を解消し得る吸収体の製造方法及び製造装置に関する。 Therefore, an object of the present invention relates to an absorber manufacturing method and a manufacturing apparatus that can eliminate the above-described drawbacks of the prior art.
　以下本発明を、その好ましい実施形態に基づき図面を参照しながら説明する。まず、本発明によって製造される吸収体を有する吸収性物品の一例である生理用ナプキンについて説明する。図１及び図２に示すように、生理用ナプキン１は、液保持性の吸収体４並びに該吸収体４の肌対向面側に配置された表面シート２及び該吸収体４の非肌対向面側に配置された裏面シート３を具備する吸収性本体５を備え、着用者の前後方向に相当する縦方向Ｘとこれに直交する横方向Ｙとを有する。 Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. First, the sanitary napkin which is an example of the absorbent article which has the absorber manufactured by this invention is demonstrated. As shown in FIGS. 1 and 2, the sanitary napkin 1 includes a liquid-retaining absorbent body 4, a surface sheet 2 disposed on the skin facing surface side of the absorbent body 4, and a non-skin facing surface of the absorbent body 4. It has an absorptive main body 5 having a back sheet 3 disposed on the side, and has a longitudinal direction X corresponding to the wearer's front-rear direction and a lateral direction Y orthogonal thereto.
　なお、本明細書において、肌対向面は、吸収性物品又はその構成部材（例えば吸収性本体５）における、吸収性物品の着用時に着用者の肌側に向けられる面であり、非肌対向面は、吸収性物品又はその構成部材における、吸収性物品の着用時に肌側とは反対側（着衣側）に向けられる面である。また、縦方向Ｘは、吸収性物品（吸収性本体、吸収体）の長手方向に一致し、横方向Ｙは、吸収性物品（吸収性本体、吸収体）の幅方向（長手方向に直交する方向）に一致する。 In addition, in this specification, a skin opposing surface is a surface which faces a wearer's skin side at the time of wear of an absorbent article in an absorbent article or its structural member (for example, absorbent main body 5), and is a non-skin opposing surface Is the surface of the absorbent article or its component that is directed to the side opposite to the skin side (clothing side) when the absorbent article is worn. Further, the longitudinal direction X coincides with the longitudinal direction of the absorbent article (absorbent body, absorbent body), and the lateral direction Y is perpendicular to the width direction (longitudinal direction) of the absorbent article (absorbent body, absorbent body). Direction).
　吸収性本体５は、着用時に着用者の液***部（膣口等）に対向配置される***部対向部Ｂと、着用時に***部対向部Ｂよりも着用者の腹側（前側）に配される前方部Ａと、着用時に***部対向部Ｂよりも着用者の背側（後側）に配される後方部Ｃとを縦方向Ｘに有している。
　ナプキン１は、吸収性本体５に加えて更に、吸収性本体５における***部対向部Ｂの縦方向Ｘに沿う両側部それぞれから横方向Ｙの外方に延出する一対のウイング部７，７を有している。 The absorptive main body 5 is disposed on the abdomen (front side) of the wearer relative to the excretion part facing part B disposed opposite to the wearer's liquid excretion part (such as the vaginal opening) when worn and the excretion part facing part B when worn. The front portion A and the rear portion C arranged on the back side (rear side) of the wearer rather than the excretory portion facing portion B at the time of wearing are provided in the vertical direction X.
In addition to the absorbent main body 5, the napkin 1 further includes a pair of wing portions 7, 7 extending outward in the lateral direction Y from both side portions along the vertical direction X of the excretory portion facing portion B of the absorbent main body 5. have.
　図２に示すように、表面シート２は、吸収体４の肌対向面の全域を被覆し、更に吸収体４の縦方向Ｘに沿う両側縁から横方向Ｙの外方に延出している。一方、裏面シート３は、吸収体４の非肌対向面の全域を被覆し、更に吸収体４の縦方向Ｘに沿う両側縁から横方向Ｙの外方に延出して、後述するサイドシート１０とともにサイドフラップ部６を形成している。裏面シート３とサイドシート１０とは、吸収体４の縦方向Ｘに沿う両側縁からの延出部において、接着剤、ヒートシール、超音波シール等の公知の接合手段によって互いに接合されている。表面シート２及び裏面シート３それぞれと吸収体４との間は接着剤によって接合されていてもよい。 As shown in FIG. 2, the top sheet 2 covers the whole area of the skin-facing surface of the absorbent body 4 and further extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4. On the other hand, the back sheet 3 covers the entire area of the non-skin facing surface of the absorbent body 4 and further extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4 to be described later. In addition, a side flap portion 6 is formed. The back sheet 3 and the side sheet 10 are joined to each other by known joining means such as an adhesive, heat seal, ultrasonic seal, and the like at the extended portions from both side edges along the longitudinal direction X of the absorber 4. The top sheet 2 and the back sheet 3 may be bonded to the absorber 4 with an adhesive.
　吸収体４は、図２に示すように、本体吸収性シート４０１及び中央吸収性シート４０２が複数層積層されてなる積層構造を有し、図１及び図２に示すように、***部対向部Ｂに多層部４２を有している。多層部４２は、図２に示すように、吸収体４を構成する吸収性シート４０１，４０２の積層枚数が、その周囲に位置する部分より多い部分である。本実施形態における多層部４２は、その周囲に位置する部分よりも厚みも厚く、***部対向部Ｂに、表面シート２側（ナプキン１の肌対向面側）に突出した***部を形成している。また、吸収体４は、吸収体４の外形を形成する主吸収体４０と、主吸収体４０の一部に重ねて配された主吸収体４０より小型の補助吸収体４１とを有している。補助吸収体４１は、少なくとも***部対向部Ｂに位置している。 The absorbent body 4 has a laminated structure in which a main body absorbent sheet 401 and a central absorbent sheet 402 are laminated as shown in FIG. 2, and as shown in FIGS. B has a multilayer portion 42. As shown in FIG. 2, the multilayer part 42 is a part where the number of laminated absorbent sheets 401 and 402 constituting the absorbent body 4 is larger than the part located around the multilayered part 42. The multilayer part 42 in this embodiment is thicker than the part located in the circumference | surroundings, and forms the protruding part which protruded in the excretion part opposing part B to the surface sheet 2 side (skin opposing surface side of the napkin 1). Yes. The absorbent body 4 includes a main absorbent body 40 that forms the outer shape of the absorbent body 4, and an auxiliary absorbent body 41 that is smaller than the main absorbent body 40 that is arranged on a part of the main absorbent body 40. Yes. The auxiliary absorber 41 is located at least in the excretory part facing part B.
　吸収体４は、吸収性シート４０１，４０２の積層構造のみから構成されていることが好ましく、該吸収体４は、厚みの薄さと、高吸収力、また折り加工の安定性や形状変形の自由度の点から、高吸収性ポリマーの粒子が繊維層間に保持された吸収性シートを用いることが好ましい。 The absorbent body 4 is preferably composed only of a laminated structure of absorbent sheets 401 and 402. The absorbent body 4 has a thin thickness, a high absorbent capacity, stability of folding processing, and freedom of shape deformation. From the point of view, it is preferable to use an absorbent sheet in which particles of a superabsorbent polymer are held between fiber layers.
　主吸収体４０は、パルプを含む本体吸収性シート４０１の折り畳み構造からなる。詳細には、主吸収体４０は、本体吸収性シート４０１を、縦方向Ｘに沿って延びる折り線４０１ａ，４０１ｂの位置で内折りして形成されている。つまり本体吸収性シート４０１は、両端折りの折り畳み状態になっている。このとき、本体吸収性シート４０１のうち、内折りされた部位が互いに一部重なるように、折り線４０１ａ，４０１ｂの位置を調整する。したがって主吸収体４０は、本体吸収性シート４０１からなる２層及び３層の積層構造になっている。 The main absorbent body 40 has a folded structure of a main body absorbent sheet 401 containing pulp. Specifically, the main absorbent body 40 is formed by folding the main body absorbent sheet 401 inwardly at positions of folding lines 401 a and 401 b extending along the vertical direction X. That is, the main body absorbent sheet 401 is folded at both ends. At this time, the positions of the folding lines 401a and 401b are adjusted so that the inwardly folded portions of the main body absorbent sheet 401 partially overlap each other. Therefore, the main absorbent body 40 has a laminated structure of two layers and three layers made of the main body absorbent sheet 401.
　一方、補助吸収体４１は、パルプを含む中央吸収性シート４０２の折り畳み構造からなる。詳細には、補助吸収体４１は、中央吸収性シート４０２を、縦方向Ｘに沿って延びる折り線４０２ａに沿って、該折り線４０２ａよりも外方に位置する部位を内折りする。次に、折り線４０２ｂに沿って、該折り線４０２ｂよりも外方に位置する部位を、先に折られている部位の側に向けて内折りする。折り線４０２ａ及び４０２ｂは、中央吸収性シート４０２の横方向Ｙの長さを略三等分する位置に形成される。これによって中央吸収性シート４０２は、巻き三つ折りの折り畳み状態となる。したがって補助吸収体４１は、中央吸収性シート４０２からなる３層の積層構造になっている。 On the other hand, the auxiliary absorbent body 41 has a folded structure of the central absorbent sheet 402 containing pulp. Specifically, the auxiliary absorbent body 41 folds the central absorbent sheet 402 inward along a fold line 402a extending along the longitudinal direction X at a portion located outward from the fold line 402a. Next, along the fold line 402b, the part located outward from the fold line 402b is folded inward toward the part that is folded first. The fold lines 402a and 402b are formed at positions that divide the length in the lateral direction Y of the central absorbent sheet 402 into approximately three equal parts. As a result, the central absorbent sheet 402 is in a folded state with three windings. Therefore, the auxiliary absorbent body 41 has a three-layer structure composed of the central absorbent sheet 402.
　図２に示すとおり、巻き三つ折りの折り畳み状態となっている中央吸収性シート４０２は、両端折りの折り畳み状態になっている本体吸収性シート４０１の内部に配置されている。つまり、本体吸収性シート４０１と中央吸収性シート４０２とは、入れ子の折り畳み構造になっている。その結果、本体吸収性シート４０１と中央吸収性シート４０２との積層構造においては、中央吸収性シート４０２の周縁の少なくとも一部、具体的には該周縁の全域から外方に延出するように本体吸収性シート４０１が積層されている。なお、補助吸収体４１は、上述のとおり***部対向部Ｂに位置しているので、該補助吸収体４１を構成する中央吸収性シート４０２も***部対向部Ｂに位置していることになる。
　多層部４２においては５層、多層部４２以外の部分においては３層に積層された吸収性シートの各層が、本発明における「吸収層」である。 As shown in FIG. 2, the central absorbent sheet 402 that is in a folded state with three windings is disposed inside the main body absorbent sheet 401 that is in a folded state with both ends folded. That is, the main body absorbent sheet 401 and the central absorbent sheet 402 have a nested folding structure. As a result, in the laminated structure of the main body absorbent sheet 401 and the central absorbent sheet 402, it extends outward from at least a part of the peripheral edge of the central absorbent sheet 402, specifically from the entire region of the peripheral edge. A main body absorbent sheet 401 is laminated. In addition, since the auxiliary | assistant absorber 41 is located in the excretion part opposing part B as above-mentioned, the center absorbent sheet 402 which comprises this auxiliary | assistant absorber 41 is also located in the excretion part opposing part B. .
Each layer of the absorbent sheet laminated in five layers in the multilayer portion 42 and three layers in the portions other than the multilayer portion 42 is an “absorbent layer” in the present invention.
　本体吸収性シート４０１の折り畳み構造からなる主吸収体４０は、平面視において角が丸みを帯びた略矩形形状でかつ前方部Ａから***部対向部Ｂを経て後方部Ｃにわたって延びている。一方、中央吸収性シート４０２の折り畳み構造からなる補助吸収体４１は、平面視において略矩形形状であり、***部対向部Ｂからその近傍の後方部Ｃにわたって配されている。主吸収体４０の一部に補助吸収体４１を配することで、吸収体４の一部の吸収容量を容易かつ効率的に増大させることができる。補助吸収体４１は、折り畳まれた本体吸収性シート４０１からなる主吸収体４０の内部に配置するのに代えて、主吸収体４０を構成する本体吸収性シート４０１の肌対向面側に積層してもよいし、非肌対向面側に積層してもよい。 The main absorbent body 40 having a folded structure of the main body absorbent sheet 401 has a substantially rectangular shape with rounded corners in plan view, and extends from the front part A to the rear part C via the excretory part facing part B. On the other hand, the auxiliary absorbent body 41 having a folded structure of the central absorbent sheet 402 has a substantially rectangular shape in plan view, and is arranged from the excretory part facing part B to the rear part C in the vicinity thereof. By arranging the auxiliary absorber 41 in a part of the main absorber 40, the absorption capacity of a part of the absorber 4 can be easily and efficiently increased. The auxiliary absorbent body 41 is laminated on the skin facing surface side of the main body absorbent sheet 401 constituting the main absorbent body 40, instead of being disposed inside the main absorbent body 40 composed of the folded main body absorbent sheet 401. Alternatively, it may be laminated on the non-skin facing surface side.
　吸収性本体５の肌対向面（表面シート２の肌対向面）における縦方向Ｘに沿う両側部には、図２に示すように、平面視において吸収体４の縦方向Ｘに沿う左右両側部に重なるように、一対のサイドシート１０，１０が吸収性本体５の縦方向Ｘの略全長にわたって配されている。一対のサイドシート１０，１０は、それぞれ、***部対向部Ｂに位置する線状の第１接合線１１と、該第１接合線１１の縦方向Ｘの前後（前方部Ａ及び後方部Ｃ）に位置する線状の第２接合線１２とで吸収性本体５（表面シート２）に接合されている。第１接合線１１は、平面視において横方向Ｙの外方に向けて凸の曲線状であり、第２接合線１２は、平面視において縦方向に交差するように延びる線状（ジグザグ線状）である。サイドシート１０は、撥水性の不織布からなる。このように、サイドシート１０が接合線１１，１２にて吸収性本体５の肌対向面（表面シート２）に接合されていると、図２に示すように、接合線１１，１２よりも横方向Ｙの内方に、サイドシート１０と表面シート２とで画成される空間部Ｐが形成される。この空間部Ｐは、吸収性本体５の横方向Ｙの中央に向けて開口しているので、横方向Ｙの中央から外方へ流れる経血等の***液は空間部Ｐに収容されるようになり、結果として***液の漏れが効果的に防止される。 On both sides along the vertical direction X of the skin facing surface of the absorbent main body 5 (skin facing surface of the topsheet 2), as shown in FIG. A pair of side sheets 10, 10 are arranged over substantially the entire length in the longitudinal direction X of the absorbent main body 5. The pair of side sheets 10 and 10 are each a linear first joining line 11 located in the excretory part facing part B, and the longitudinal direction X of the first joining line 11 (front part A and rear part C). It joins to the absorptive main body 5 (surface sheet 2) with the linear 2nd joining line 12 located in this. The first joining line 11 has a curved shape that protrudes outward in the lateral direction Y in plan view, and the second joining line 12 has a linear shape (zigzag line shape) that extends in the longitudinal direction in plan view. ). The side sheet 10 is made of a water-repellent nonwoven fabric. Thus, when the side sheet 10 is joined to the skin facing surface (surface sheet 2) of the absorbent main body 5 by the joining lines 11 and 12, as shown in FIG. A space P defined by the side sheet 10 and the top sheet 2 is formed inward in the direction Y. Since the space P is open toward the center in the lateral direction Y of the absorbent main body 5, excretion fluid such as menstrual blood flowing outward from the center in the lateral direction Y seems to be accommodated in the space P. As a result, the leakage of excretory fluid is effectively prevented.
　サイドフラップ部６は、図１に示すように、***部対向部Ｂにおいて横方向Ｙの外方に向かって大きく張り出しており、これにより吸収性本体５の縦方向Ｘに沿う左右両側に、一対のウイング部７，７が延設されている。また、表面シート２及び裏面シート３は、図１に示すように、吸収体４の縦方向Ｘの前端及び後端それぞれから縦方向Ｘの外方に延出し、それらの延出部において、接着剤、ヒートシール、超音波シール等の公知の接合手段によって、互いに接合されてエンドシール部を形成している。 As shown in FIG. 1, the side flap portions 6 project greatly outward in the lateral direction Y at the excretory portion-facing portion B, whereby a pair of side flap portions 6 are provided on both the left and right sides along the longitudinal direction X of the absorbent main body 5. The wing portions 7, 7 are extended. Further, as shown in FIG. 1, the top sheet 2 and the back sheet 3 extend outward in the longitudinal direction X from the front end and the rear end in the longitudinal direction X of the absorbent body 4. The end seal portion is formed by bonding to each other by a known bonding means such as an agent, heat sealing, ultrasonic sealing or the like.
　ウイング部７は、ショーツ等の着衣のクロッチ部の非肌対向面側に折り返されて用いられるものである。ウイング部７は、図１に示すように、平面視において、下底（上底よりも長い辺）が吸収性本体５の側部側に位置する略台形形状を有している。ウイング部７の非肌対向面には、該ウイング部７（ナプキン１）をショーツ等の着衣（図示せず）に固定するウイング部粘着部（図示せず）が形成されており、このウイング部粘着部によって、使用時に、着衣のクロッチ部の非肌対向面（外面）側に折り返されたウイング部７を、該クロッチ部に粘着固定できるようになされている。また、吸収性本体５の非肌対向面にも、吸収性本体５を、ショーツ等の着衣に固定するための本体粘着部（図示せず）が形成されている。なお、ナプキン１においては、吸収性本体５とウイング部７との境界線は、ウイング部７の縦方向Ｘの両付け根を結ぶ直線（図示せず）である。 The wing part 7 is used by being folded back to the non-skin facing surface side of the crotch part of clothes such as shorts. As shown in FIG. 1, the wing portion 7 has a substantially trapezoidal shape in which a lower base (a side longer than the upper base) is positioned on the side of the absorbent main body 5 in a plan view. On the non-skin facing surface of the wing part 7, a wing part adhesive part (not shown) for fixing the wing part 7 (napkin 1) to clothing (not shown) such as shorts is formed. The wing portion 7 that is folded back to the non-skin facing surface (outer surface) side of the crotch portion of the clothes can be adhered and fixed to the crotch portion by the adhesive portion. Moreover, the main body adhesion part (not shown) for fixing the absorptive main body 5 to clothes, such as shorts, is also formed in the non-skin opposing surface of the absorptive main body 5. In the napkin 1, the boundary line between the absorbent main body 5 and the wing portion 7 is a straight line (not shown) that connects the roots in the longitudinal direction X of the wing portion 7.
　図１及び図２に示すように、吸収性本体５の肌対向面（表面シート２の肌対向面）には、表面シート２及び吸収体４が裏面シート３側に向かって一体的に凹陥してなる線状溝が形成されており、該線状溝は、***部対向部Ｂにおいて縦方向Ｘに延びる縦溝５１と、前方部Ａ及び後方部Ｃにおいて、それぞれ横方向Ｙに延びるように形成された第１及び第２の横溝５２，５３とを含む。線状溝は、熱を伴うか又は伴わない圧搾加工（いわゆるエンボス加工）、あるいは超音波エンボス等のエンボス加工により常法に従って形成することができる。線状溝においては、表面シート２及び吸収体４との間が、図示しないが、接着剤を介して圧着されるか、あるいは熱融着等により一体化している。 As shown in FIG.1 and FIG.2, the surface sheet 2 and the absorber 4 are dented integrally on the skin opposing surface (skin opposing surface of the surface sheet 2) of the absorptive main body 5 toward the back surface sheet 3 side. The linear groove is formed so as to extend in the horizontal direction Y in the vertical groove 51 extending in the vertical direction X in the excretory part facing part B and in the front part A and the rear part C, respectively. The first and second lateral grooves 52 and 53 are formed. A linear groove | channel can be formed in accordance with a conventional method by embossing, such as a pressing process (what is called embossing) with or without heat (what is called embossing), or ultrasonic embossing. In the linear groove, the surface sheet 2 and the absorber 4 are not shown in the figure, but are bonded by an adhesive or integrated by thermal fusion or the like.
　図１に示すように、吸収体４には、その***部対向部Ｂに、縦方向Ｘに沿う縦スリット４３が複数、分散した状態に形成されている。縦スリット４３は、縦方向Ｘ及び横方向Ｙの両方向に分散した状態に形成されている。縦スリット４３は、図２に示すように、吸収体４をその厚み方向に向けて切り込むことで形成されており、吸収体４を構成する吸収性シート４０１，４０２の積層構造を貫通していることが好ましい。縦スリット４３は、吸収体４の上下に配される表面シート２及び裏面シート３には、形成されていないことが好ましい。 As shown in FIG. 1, the absorbent body 4 is formed with a plurality of longitudinal slits 43 along the longitudinal direction X dispersed in the excretory part facing part B. The vertical slits 43 are formed in a state of being distributed in both the vertical direction X and the horizontal direction Y. As shown in FIG. 2, the vertical slit 43 is formed by cutting the absorber 4 in the thickness direction, and penetrates the laminated structure of the absorbent sheets 401 and 402 constituting the absorber 4. It is preferable. The vertical slits 43 are preferably not formed in the top sheet 2 and the back sheet 3 disposed above and below the absorber 4.
　各縦スリット４３は個々に独立しており、隣り合う縦スリット４３どうしの間には非スリット部４３’が位置している。そして、各縦スリット４３は、その周囲の全域が非スリット部４３’によって囲まれている。 Each vertical slit 43 is individually independent, and a non-slit portion 43 ′ is located between adjacent vertical slits 43. Each vertical slit 43 is surrounded by a non-slit portion 43 ′ around the entire periphery.
　縦スリット４３は、上述のとおり、吸収体４をその厚み方向にわたって切り込みを入れて形成されたものであり、実質的に幅を有していない切り込みから形成されているか、又は好ましくは１．５ｍｍ以下の細幅の空間となっている。縦スリット４３が幅を有している場合、当該幅とは、縦スリット４３の延びる方向と直交する方向における該縦スリット４３の長さのことを言う。 As described above, the vertical slit 43 is formed by cutting the absorber 4 in the thickness direction, and is formed from a cut having substantially no width, or preferably 1.5 mm. It has the following narrow space. When the vertical slit 43 has a width, the width means the length of the vertical slit 43 in a direction orthogonal to the direction in which the vertical slit 43 extends.
　吸収体４は、***部対向部Ｂより後方に位置する後方部Ｃに、ナプキン１の縦方向Ｘと交差する方向へ長手方向を有するように延びる複数本の後方スリット４５を有する。この後方スリット４５は、図１（ｂ）に示すように、スリット４５の長手方向の中央部４５ａの位置が、該長手方向の両端部４５ｂ，４５ｂの位置よりも前方部Ａ側に位置する平面視形状を有しており、より好ましくは、前方部Ａ側に向かって凸に湾曲した平面視形状を有している。また、後方スリット４５は、吸収性物品の縦方向Ｘに間隔を開けて複数本形成されている。 The absorbent body 4 has a plurality of rear slits 45 extending in the rear part C located behind the excretory part facing part B so as to have a longitudinal direction in a direction intersecting the longitudinal direction X of the napkin 1. As shown in FIG. 1B, the rear slit 45 is a plane in which the position of the central portion 45a in the longitudinal direction of the slit 45 is located on the front portion A side with respect to the positions of both end portions 45b and 45b in the longitudinal direction. It has a view shape, and more preferably has a plan view shape that is convexly curved toward the front portion A side. Moreover, the back slit 45 is formed in multiple numbers at intervals in the longitudinal direction X of the absorbent article.
　図３には、上述した生理用ナプキン１における吸収体４の製造装置が模式的に示されている。本発明の好ましい実施態様においては、図３に示すように、切断装置６０を用いたスリット形成工程、及び柔軟化手段７０を用いた柔軟化工程を経て、上述した生理用ナプキン１の吸収体又はその連続体４を製造する。
　スリット形成工程に用いる切断装置６０は、切断刃６３，６４を周面に有するカッターロール６１と、該カッターロール６１の切断刃６３，６４を受けるアンビルロール６２とを備えている。切断刃６３は、縦スリット４３を形成するための切断刃であり、カッターロール６１の周方向及び軸長方向に分散させて複数形成されている。切断刃６４は、後方スリット４５を形成するための切断刃であり、カッターロール６１の周方向に間隔を設けて複数形成されている。 FIG. 3 schematically shows an apparatus for manufacturing the absorbent body 4 in the sanitary napkin 1 described above. In a preferred embodiment of the present invention, as shown in FIG. 3, the absorbent body of the sanitary napkin 1 described above or the slit forming step using the cutting device 60 and the softening step using the softening means 70 are used. The continuous body 4 is manufactured.
The cutting device 60 used in the slit forming step includes a cutter roll 61 having cutting blades 63 and 64 on the peripheral surface, and an anvil roll 62 that receives the cutting blades 63 and 64 of the cutter roll 61. The cutting blades 63 are cutting blades for forming the vertical slits 43, and a plurality of cutting blades 63 are formed in the circumferential direction and the axial length direction of the cutter roll 61. The cutting blade 64 is a cutting blade for forming the rear slit 45, and a plurality of cutting blades 64 are formed at intervals in the circumferential direction of the cutter roll 61.
　カッターロール６１及びアンビルロール６２は、それらの軸心６１’，６２’が平行になるように配置されている。カッターロール６１とアンビルロール６２との間にはクリアランスが設けられているか、又は両ロールは当接状態になっている。カッターロール６１の周面に位置する切断刃６３，６４は、目的とする吸収体４に形成する各スリット４３，４５の形状や配置と一致するように形成・配置されている。 The cutter roll 61 and the anvil roll 62 are arranged so that their axial centers 61 'and 62' are parallel to each other. A clearance is provided between the cutter roll 61 and the anvil roll 62, or both rolls are in contact with each other. The cutting blades 63 and 64 positioned on the peripheral surface of the cutter roll 61 are formed and arranged so as to coincide with the shape and arrangement of the slits 43 and 45 formed in the target absorbent body 4.
　本体吸収性シートと中央吸収性シートとの積層構造からなる吸収体の前駆体である吸収体前駆体４ａ（以下、簡便のため「前駆体４ａ」とも言う。）は、図３中、矢印Ｒで示される一方向に向けて搬送されて、切断装置６０におけるカッターロール６１とアンビルロール６２との間に供給される。両ロール６１，６２の間に供給される前の前駆体４ａの厚み方向の断面の状態が、図３中、Ｉで示す円内に表されている。両ロール６１，６２の間に供給される前の前駆体４ａでは、各吸収性シート４０１，４０２の間は非接合状態になっている。 An absorber precursor 4a (hereinafter also referred to as “precursor 4a” for the sake of simplicity), which is a precursor of an absorbent body having a laminated structure of a main body absorbent sheet and a central absorbent sheet, is shown by an arrow R in FIG. And is supplied between the cutter roll 61 and the anvil roll 62 in the cutting device 60. The state of the cross section in the thickness direction of the precursor 4a before being supplied between the two rolls 61 and 62 is shown in a circle indicated by I in FIG. In the precursor 4a before being supplied between the two rolls 61 and 62, the absorbent sheets 401 and 402 are not joined.
　両ロール６１，６２の間に前駆体４ａが供給されると、両ロール６１，６２による挟圧によってカッターロール６１の周面に設けられた切断刃６３が前駆体４ａの厚み方向に沿って該前駆体４ａ内に進行する。これにより、前駆体４ａに縦スリット４３及び後方スリット４５が形成される。縦スリット４３が形成された後の前駆体４ａの厚み方向の断面の状態が、図３中、ＩＩで示す円内に表されている。
　スリット形成工程においては、各吸収性シート４０１，４０２が、切断刃６３の進行に起因して圧密化されることによって、縦スリット４３の周囲には、積層された吸収性シート４０１，４０２（吸収層間）間が圧着された圧着部４３ａ（圧搾部）が形成される。同様に、後方スリット４５の周囲にも、積層された吸収性シート４０１，４０２（吸収層間）間が圧着された圧着部４３ａ（圧搾部）が形成される。「周囲に圧搾部を有するスリット」は、スリットの長手方向に沿う一対のスリット隣接部の一方又は双方のみに圧着部４３ａ（圧搾部）を有していても良いし、スリットの全周に亘って圧着部４３ａ（圧搾部）を有していても良い。 When the precursor 4a is supplied between both the rolls 61 and 62, the cutting blade 63 provided on the peripheral surface of the cutter roll 61 by the sandwiching pressure by the both rolls 61 and 62 extends along the thickness direction of the precursor 4a. Proceeds into the precursor 4a. Thereby, the vertical slit 43 and the back slit 45 are formed in the precursor 4a. The state of the cross section in the thickness direction of the precursor 4a after the vertical slit 43 is formed is shown in a circle indicated by II in FIG.
In the slit forming step, the respective absorbent sheets 401 and 402 are consolidated due to the progress of the cutting blade 63, so that the absorbent sheets 401 and 402 (absorption absorbed) stacked around the vertical slit 43. A pressure-bonding portion 43a (squeezed portion) between the layers is formed. Similarly, a crimping part 43a (pressing part) in which the laminated absorbent sheets 401 and 402 (absorbing layers) are crimped is also formed around the rear slit 45. "The slit which has a pressing part in the circumference | surroundings" may have the crimping | compression-bonding part 43a (squeezing part) only in one or both of a pair of slit adjoining part along the longitudinal direction of a slit, and it covers the perimeter of a slit. And may have a crimping part 43a (squeezing part).
　図４には、カッターロール６１に備えられた切断刃６３の先端部を拡大して示す断面図が示されている。同図における紙面の左右方向は、カッターロール６１の軸心方向と一致する。また同図における紙面と直交する方向は、前駆体４ａの搬送方向と平行な方向である。同図に示すとおり、切断刃６３は、その先端角が２段階に変化している。具体的には切断刃６３は、その最も先端の位置において、２つの斜辺Ｌ１，Ｌ１によって第１先端角θ１をなしている。また切断刃６３は、その最も先端の位置から若干基部寄り（図４では切断刃６３の上方側）の位置で、各斜辺Ｌ１に連なる別の斜辺Ｌ２，Ｌ２によって第２先端角θ２をなしている。第１先端角θ１は、第２先端角θ２よりも大きくなっている。切断刃６３の先端角を２段に変化させ、かつ第１先端角θ１を第２先端角θ２よりも大きくすることで、幅の狭いスリットを形成しつつ、切断刃６３の摩耗を抑制することができるという有利な効果が奏される。 FIG. 4 shows an enlarged cross-sectional view of the tip portion of the cutting blade 63 provided in the cutter roll 61. The left-right direction of the paper surface in the figure coincides with the axial direction of the cutter roll 61. Moreover, the direction orthogonal to the paper surface in the figure is a direction parallel to the conveyance direction of the precursor 4a. As shown in the figure, the cutting blade 63 has its tip angle changed in two stages. Specifically, the cutting blade 63 forms a first tip angle θ1 by two hypotenuses L1, L1 at the most tip position. Further, the cutting blade 63 is at a position slightly closer to the base from the position of the most distal end (above the cutting blade 63 in FIG. 4) and forms a second distal end angle θ2 by the other oblique sides L2 and L2 connected to each oblique side L1. Yes. The first tip angle θ1 is larger than the second tip angle θ2. By changing the tip angle of the cutting blade 63 in two steps and making the first tip angle θ1 larger than the second tip angle θ2, wear of the cutting blade 63 is suppressed while forming a narrow slit. There is an advantageous effect that it is possible.
　以上の有利な効果を一層顕著なものとする観点から、第１先端角θ１は４０度以上、特に６０度以上であることが好ましく、また１００度以下、特に９０度以下であることが好ましい。例えば第１先端角θ１は、４０度以上１００度以下、特に６０度以上９０度以下であることが好ましい。一方、第２先端角θ２は、第１先端角θ１よりも小さいことを条件として、３０度以上、特に５０度以上であることが好ましく、また９０度以下、特に７０度以下であることが好ましい。例えば第２先端角θ２は、３０度以上９０度以下、特に５０度以上７０度以下であることが好ましい。
　第１先端角θ１が、第２先端角θ２よりも大きいと、スリット４３，４５の周囲に、圧着部４３ａ（圧搾部）が一層生じ易くなる。 From the viewpoint of making the above advantageous effects more remarkable, the first tip angle θ1 is preferably 40 degrees or more, particularly 60 degrees or more, and preferably 100 degrees or less, particularly 90 degrees or less. For example, the first tip angle θ1 is preferably 40 degrees or more and 100 degrees or less, and particularly preferably 60 degrees or more and 90 degrees or less. On the other hand, on the condition that the second tip angle θ2 is smaller than the first tip angle θ1, it is preferably 30 degrees or more, particularly 50 degrees or more, and preferably 90 degrees or less, particularly 70 degrees or less. . For example, the second tip angle θ2 is preferably 30 degrees or greater and 90 degrees or less, and particularly preferably 50 degrees or greater and 70 degrees or less.
When the first tip angle θ1 is larger than the second tip angle θ2, a crimping portion 43a (squeezing portion) is more likely to be generated around the slits 43 and 45.
　縦スリット４３や後方スリット４５の周囲に、圧着部４３ａ（圧搾部）が存在すると、吸収体に当該スリットを設けたことによる利点が十分に発揮されなくなる恐れがある。例えば、着用者に身体形状に対するフィット性を高めるために設けたスリットであるにもかかわらず、吸収体の柔軟性を十分に高めることがでず、フィット性の向上効果が十分には得られなかったり、着用者の動きに対する追従性を高めるために設けたスリットであるにもかかわらず、着用者の動きに対する追従性を十分に高められなかったりする。 If there is a crimping part 43a (pressing part) around the vertical slit 43 and the rear slit 45, there is a possibility that the advantage of providing the slit in the absorber is not sufficiently exhibited. For example, although it is a slit provided for the wearer to improve the fit to the body shape, the flexibility of the absorber cannot be sufficiently increased, and the effect of improving the fit cannot be sufficiently obtained Even though the slit is provided to improve the followability to the wearer's movement, the followability to the wearer's movement may not be sufficiently improved.
　そこで本実施態様においては、以下に述べるとおり、スリット形成工程後に、この圧搾部を柔軟化させる柔軟化工程を行う。 Therefore, in this embodiment, as described below, after the slit forming process, a softening process is performed to soften the compressed portion.
　本実施態様における柔軟化工程においては、スリット形成工程においてスリット４３，４５を形成した吸収体前駆体４’（以下、簡便のため「スリット付前駆体４’」とも言う。）に対して、第１のロール７１（巻き掛け部）を備えた柔軟化手段７０を用いて柔軟化加工を行う。第１のロール７１は、スリット付前駆体４’を、巻き掛け可能な巻き掛け部である。ここで、「巻き掛け」とは、スリット付前駆体４’が第１のロール７１の軸方向からみて、第１のロール７１と点で接するのではなく、第１のロール７１の周面に沿うように接触した状態のことをいう。すなわち、スリット付前駆体４’が第１のロール７１にある程度の抱き角を有しながら搬送されることをいう。 In the softening process according to the present embodiment, the absorber precursor 4 ′ in which the slits 43 and 45 are formed in the slit forming process (hereinafter, also referred to as “precursor with slit 4 ′” for the sake of simplicity). The softening process is performed using the softening means 70 including one roll 71 (winding portion). The 1st roll 71 is a winding part which can wind the precursor 4 'with a slit. Here, “winding” means that the precursor 4 ′ with slit is not in contact with the first roll 71 at a point when viewed from the axial direction of the first roll 71, but on the peripheral surface of the first roll 71. A state of contact along the line. That is, it means that the precursor 4 ′ with slit is conveyed to the first roll 71 while having a certain holding angle.
　本実施態様における柔軟化手段７０は、図３及び図５に示すように、第１のロール７１に加えて、スリット付前駆体４’の搬送方向における上流側に配された第２のロール７２と、同搬送方向における下流側に配された第３のロール７３とを備えている。第１～第３のロール７１～７３は、それらの軸心７１’，７２’，７３’が互いに平行になるように配置されている。また、第１のロール７１と第２のロール７２との間にはクリアランスが設けられており、第２のロール７２と第３のロール７３との間にもクリアランスが設けられている。第１～第３のロールは、何れも、表面が平坦なフラットロールである。
　第１のロール７１は、第２のロール７２と第３のロール７３との間の空間内に一部が入り込むように配置されており、より具体的には、ロール７１の下側の半分程度が入り込んでいる。
　なお、本発明における巻き掛け部としては、ロールのほか、ベルトコンベアにおける、ベルトがロールによって折り返されて断面円弧状に変形した部分等が挙げられる。 As shown in FIGS. 3 and 5, the softening means 70 in the present embodiment includes, in addition to the first roll 71, a second roll 72 disposed on the upstream side in the conveying direction of the precursor 4 ′ with slit. And a third roll 73 disposed on the downstream side in the transport direction. The first to third rolls 71 to 73 are arranged such that their axis centers 71 ′, 72 ′, and 73 ′ are parallel to each other. Further, a clearance is provided between the first roll 71 and the second roll 72, and a clearance is also provided between the second roll 72 and the third roll 73. Each of the first to third rolls is a flat roll having a flat surface.
The first roll 71 is disposed so that a part of the first roll 71 enters the space between the second roll 72 and the third roll 73, and more specifically, the lower half of the roll 71. Has entered.
In addition, as a winding part in this invention, the part etc. which the belt | belt conveyor bent by the roll and deform | transformed into circular arc shape other than a roll are mentioned.
　柔軟化手段７０により柔軟化加工を施す対象のスリット付前駆体４’は、ベルトコンベア等の公知の搬送手段（図示せず）により搬送されて、図５に示すように、第２のロール７２の周面上に導入され、次いで第１のロール７１の周面上へと受け渡され、更に第３のロール７３の周面上へと受け渡された後、第３のロール７３の周面から、ベルトコンベア等の公知の搬送手段（図示せず）に受け渡されて、更に下流へと搬送される。
　スリット付前駆体４’は、図５に示すように、第２のロール７２の周面上においては、第１面ａ側に凸の断面円弧状の形状に変形され、第１のロール７１の周面上においては、第２面ｂ側に凸の断面円弧状の形状に変形され、更に第３のロール７３の周面上においては、第２面ｂ側に凸の断面円弧状の形状に変形される。スリット付前駆体４’は、第１～第３のロール７１～７３の周面に沿う形状に変形させられつつ、第１～第３のロール７１～７３を通過する。なお、第１～第３のロール７１～７３は、それ自体がサーボモータ等の駆動手段（図示せず）を備えた駆動ロールであっても良いし、駆動を持たないフリーロールであっても良い。この場合、第１～第３のロール７１～７３による巻き掛けによってスリット付前駆体４’の搬送性が損なわれないよう、第３のロール７３の下流側の直近において駆動ロール（図示せず）を設けることが好ましい。図３中、ＩＩＩで示す円内には、第１～第３のロール７１～７３による柔軟加工後の、吸収体４の厚み方向の断面の状態が表されている。
　スリット付前駆体４’は、第２のロール７２、第１のロール７３及び第３のロール７３の周面に沿う形状に順次変形させられながら搬送されることで、圧着部４３’において、それまで接合されていた各吸収性シート４０１，４０２（吸収層）間が引き剥がされて分離し、各吸収性シート４０１，４０２が、スリットが形成される前の状態の非接合状態に戻る。 The slitted precursor 4 ′ to be softened by the softening means 70 is transported by a known transport means (not shown) such as a belt conveyor, and as shown in FIG. After being introduced onto the circumferential surface of the first roll 71 and then onto the circumferential surface of the third roll 73, the circumferential surface of the third roll 73. Then, it is transferred to a known conveying means (not shown) such as a belt conveyor and further conveyed downstream.
As shown in FIG. 5, the slit-attached precursor 4 ′ is deformed into a circular arc shape that is convex toward the first surface “a” on the peripheral surface of the second roll 72. On the peripheral surface, it is deformed into a circular arc shape that is convex toward the second surface b side, and further, on the peripheral surface of the third roll 73, it is formed into a circular arc shape that is convex toward the second surface b side. Deformed. The slitted precursor 4 ′ passes through the first to third rolls 71 to 73 while being deformed into a shape along the peripheral surfaces of the first to third rolls 71 to 73. The first to third rolls 71 to 73 themselves may be drive rolls provided with drive means (not shown) such as a servo motor, or may be free rolls that do not have drive. good. In this case, a drive roll (not shown) is provided in the immediate vicinity of the downstream side of the third roll 73 so that the transportability of the slitted precursor 4 ′ is not impaired by the winding by the first to third rolls 71 to 73. Is preferably provided. In FIG. 3, a circle indicated by III represents the state of the cross section in the thickness direction of the absorbent body 4 after the flexible processing by the first to third rolls 71 to 73.
The precursor 4 ′ with slit is conveyed while being sequentially deformed into shapes along the peripheral surfaces of the second roll 72, the first roll 73, and the third roll 73. The absorbent sheets 401 and 402 (absorbing layers) that have been bonded to each other are peeled off and separated, and the absorbent sheets 401 and 402 return to the non-bonded state before the slit is formed.
　これにより、スリット４３，４５の周囲に形成された圧着部４３ａ（圧搾部）が柔軟化した、目的とする吸収体の連続体４が首尾よく得られる。吸収体の連続体４は、公知の切断手段により個々の吸収性物品の吸収体の寸法に切断されて、上述した生理用ナプキン１の吸収体の寸法の吸収体４となる。 Thereby, the continuous body 4 of the target absorbent body in which the crimping part 43a (pressing part) formed around the slits 43 and 45 is softened can be successfully obtained. The continuous body 4 of the absorbent body is cut to the size of the absorbent body of the individual absorbent article by a known cutting means to become the absorbent body 4 having the dimensions of the absorbent body of the sanitary napkin 1 described above.
　スリット付前駆体４’において、第１面ａは、スリット形成時に、カッターロール６１側に位置した面であり、第２面ｂは、スリット形成時に、アンビルロール６２側に位置していた面である。
　本発明に用いる屈曲加工手段の巻き掛け部は、第１のロール７１のように、スリット付前駆体４’を、第１面ａ側に湾曲させるものであっても良いし、第２及び第３のロール７２，７３のように、スリット付前駆体４’を、第２面ｂ側に湾曲させるものであっても良いが、本発明に用いる屈曲加工手段は、スリット付前駆体４’を、第１面ａ側に湾曲させるロール（巻き掛け部）と、第２面ｂ側に湾曲させるロール（巻き掛け部）との両者を備えることが好ましく、本実施態様に用いた屈曲加工手段７０のように、スリット付前駆体４’を、一方の面ａ側に湾曲させる２つのロール（巻き掛け部）と、他方の面ｂ側に湾曲させる１つのロール（巻き掛け部）の合計３本以上のロールを備えることが更に好ましい。 In the precursor 4 ′ with slit, the first surface a is a surface located on the cutter roll 61 side during slit formation, and the second surface b is a surface located on the anvil roll 62 side during slit formation. is there.
The winding portion of the bending means used in the present invention may be such that, as with the first roll 71, the precursor 4 ′ with slit is curved toward the first surface a side, and the second and second 3, the slit precursor 4 ′ may be curved to the second surface b side, but the bending means used in the present invention is the slit precursor 4 ′. It is preferable to include both a roll (winding portion) that is bent toward the first surface a side and a roll (winding portion) that is bent toward the second surface b side, and the bending processing means 70 used in this embodiment. As above, a total of three rolls, that is, two rolls (winding portions) that bend the precursor 4 ′ with slits to the one surface a side and one roll (winding portion) that bends to the other surface b side. More preferably, the above rolls are provided.
　本実施態様においては、図５に示すように、第２のロール７２から第１のロール７１へと受け渡される部分においては、スリット付前駆体４’が、その搬送方向Ｒに沿う断面形状がＳ字状をなすように屈曲しており、第１のロール７１から第３のロール７３へと受け渡される部分においても、スリット付前駆体４’が、その搬送方向Ｒに沿う断面形状がＳ字状をなすように屈曲している。スリット付前駆体４’は、ロールからロールへと受け渡される部分において、その搬送方向の長さ１００ｃｍ以下の範囲がＳ字状をなすように屈曲されることが好ましい。なお、本明細書にいうＳ字状には、左右を反転した逆Ｓ字状も含まれる。 In the present embodiment, as shown in FIG. 5, in the portion delivered from the second roll 72 to the first roll 71, the precursor 4 ′ with slit has a cross-sectional shape along the transport direction R. Even in a portion that is bent so as to form an S shape and is transferred from the first roll 71 to the third roll 73, the cross-sectional shape of the precursor 4 ′ with slits along the transport direction R is S. It is bent to form a letter shape. The slit precursor 4 ′ is preferably bent so that a length of 100 cm or less in the conveying direction forms an S shape in a portion that is transferred from roll to roll. Note that the S-shape referred to in this specification includes an inverted S-shape in which left and right are reversed.
　第１～第３のロール７１～７３のうち、スリット付前駆体４’の抱き角が最も大きい第１のロール７１の抱き角θ１１は、好ましくは１０度以上、より好ましくは４０度以上であり、また、好ましくは１８０度以下、より好ましくは９０度以下であり、また、好ましくは１０度以上１８０度以下、より好ましくは４０度以上９０度以下である。
　第１ロール７１におけるスリット付前駆体４’の抱き角とは、ロールの軸心７１’と直交する平面で第１ロール７１及びスリット付前駆体４’を切断した断面において、スリット付前駆体４’が第１ロール７１と当接する領域における最上流を第１接点Ｐ（図示せず）とし、同領域における最下流を第２接点Ｐ’（図示せず）とした時、第１接点Ｐと軸心７１’を結ぶ直線（線分）と、第２接点Ｐ’と軸心７１’を結ぶ直線（線分）とのなす角度をいう。なお、第２ロール７２及び第３ロール７３におけるスリット付前駆体４’の抱き角についても同様に、第１接点Ｐと軸心７２’又は軸心７３’を結ぶ直線（線分）と、第２接線Ｐ’と軸心７２’又は軸心７３’を結ぶ直線（線分）とのなす角度をいう。
　また、第１のロール７１の半径は、好ましくは１０ｍｍ以上、より好ましくは１５ｍｍ以上であり、また、好ましくは５０ｍｍ以下、より好ましくは２０ｍｍ以下であり、また好ましくは１０ｍｍ以上５０ｍｍ以下、より好ましくは１５ｍｍ以上２０ｍｍ以下である。 Of the first to third rolls 71 to 73, the holding angle θ11 of the first roll 71 having the largest holding angle of the precursor 4 ′ with slit is preferably 10 degrees or more, more preferably 40 degrees or more. Also, it is preferably 180 degrees or less, more preferably 90 degrees or less, and preferably 10 degrees or more and 180 degrees or less, more preferably 40 degrees or more and 90 degrees or less.
The holding angle of the precursor 4 ′ with slit in the first roll 71 is the cross section obtained by cutting the first roll 71 and the precursor 4 ′ with slit in a plane orthogonal to the axis 71 ′ of the roll. When the uppermost stream in the region where 'is in contact with the first roll 71 is the first contact P (not shown) and the most downstream in the region is the second contact P' (not shown), An angle formed by a straight line (line segment) connecting the axis 71 ′ and a straight line (line segment) connecting the second contact P ′ and the axis 71 ′. Similarly, with respect to the holding angle of the precursor 4 ′ with slit in the second roll 72 and the third roll 73, a straight line (line segment) connecting the first contact P and the axis 72 ′ or the axis 73 ′, The angle formed by the two tangent lines P ′ and a straight line (line segment) connecting the axis 72 ′ or the axis 73 ′.
The radius of the first roll 71 is preferably 10 mm or more, more preferably 15 mm or more, preferably 50 mm or less, more preferably 20 mm or less, and preferably 10 mm or more and 50 mm or less, more preferably It is 15 mm or more and 20 mm or less.
　第２のロール７２及び第３のロール７３は、それぞれ、スリット付前駆体４’の抱き角θ１２、θ１３が、好ましくは１０度以上、より好ましくは２０度以上であり、また、好ましくは１８０度以下、より好ましくは４５度以下であり、また、好ましくは１０度以上１８０度以下、より好ましくは２０度以上４５度以下である。
　また、第２のロール７１及び第３のロール７３は、それぞれの半径は、好ましくは１０ｍｍ以上、より好ましくは１５ｍｍ以上であり、また、好ましくは５０ｍｍ以下、より好ましくは２０ｍｍ以下であり、また好ましくは１０ｍｍ以上５０ｍｍ以下、より好ましくは１５ｍｍ以上２０ｍｍ以下である。 Each of the second roll 72 and the third roll 73 has a holding angle θ12, θ13 of the precursor 4 ′ with a slit of preferably 10 degrees or more, more preferably 20 degrees or more, and preferably 180 degrees. Hereinafter, it is more preferably 45 degrees or less, preferably 10 degrees or more and 180 degrees or less, more preferably 20 degrees or more and 45 degrees or less.
In addition, the second roll 71 and the third roll 73 each have a radius of preferably 10 mm or more, more preferably 15 mm or more, and preferably 50 mm or less, more preferably 20 mm or less. Is from 10 mm to 50 mm, more preferably from 15 mm to 20 mm.
　また、第１～第３のロール７１～７３は、スリット４３の周辺の圧搾部の柔軟化の観点から、少なくとも一つのロールの半径が、スリット４３の、スリット付前駆体４’の搬送方向における長さの４倍以下であることが好ましく、二つ以上のロールの半径が、該スリット４３の前記長さの４倍以下であることが好ましく、総てのロールの半径が、該スリット４３の前記長さの４倍以下であることが好ましい。
　ここでいう、スリットの長さは、図３に示すスリット４３のように、スリットが搬送方向と平行に形成されている場合は、そのスリットの長手方向の全長であり、スリットが搬送方向と平行に形成されていない場合には、搬送方向におけるスリットの前端縁と後端縁との間の搬送方向の長さとする。 The first to third rolls 71 to 73 have a radius of at least one roll in the conveying direction of the slit-formed precursor 4 ′ from the viewpoint of softening the compressed portion around the slit 43. Preferably, the radius of two or more rolls is preferably 4 times or less of the length of the slit 43, and the radius of all the rolls is less than 4 times the length of the slit 43. The length is preferably 4 times or less of the length.
The length of the slit here is the total length in the longitudinal direction of the slit when the slit is formed in parallel with the transport direction like the slit 43 shown in FIG. 3, and the slit is parallel to the transport direction. If it is not formed, the length in the conveyance direction between the front edge and the rear edge of the slit in the conveyance direction is set.
　柔軟化工程で柔軟化させるスリットは、このように定義される搬送方向における長さが、好ましくは２ｍｍ以上、より好ましくは５ｍｍ以上であり、また好ましくは１００ｍｍ以下、より好ましくは５０ｍｍ以下であり、また好ましくは２ｍｍ以上１００ｍｍ以下、より好ましくは５ｍｍ以上５０ｍｍ以下である。
　なお、巻き掛け部が円筒状のロールである場合の曲率半径は、ロールの半径と同じである。 The slit to be softened in the softening step has a length in the transport direction defined as described above of preferably 2 mm or more, more preferably 5 mm or more, and preferably 100 mm or less, more preferably 50 mm or less, Further, it is preferably 2 mm or more and 100 mm or less, more preferably 5 mm or more and 50 mm or less.
Note that the radius of curvature when the winding portion is a cylindrical roll is the same as the radius of the roll.
　他方、巻き掛け部がロールではない場合、例えば、巻き掛け部が、ベルトコンベアにおける、ベルトがロールによって折り返されて断面円弧状に変形した部分である場合には、その断面円弧状に変形したベルトの曲率半径が、スリット付前駆体４’の搬送方向における長さの４倍以下であることが好ましい。
　また、本発明における柔軟化工程は、搬送方向に延びる直線状に形成されたスリットに対して一層優れた柔軟化効果が得られる。 On the other hand, when the winding portion is not a roll, for example, when the winding portion is a portion of the belt conveyor that is bent by the roll and deformed into a cross-section arc shape, the belt deformed into the cross-section arc shape. It is preferable that the curvature radius of is 4 times or less the length in the conveyance direction of the precursor 4 ′ with slit.
Moreover, the softening process in the present invention can provide a further excellent softening effect for the slits formed in a straight line extending in the transport direction.
　図６は、本発明の他の実施態様を示す図である。
　図６に示す実施態様においては、上述した切断装置６０と同一構成の切断装置６０を用いて、吸収体前駆体４Ａからスリット付前駆体４’を形成した後、切断刃８３を有するカッターロール８１と、カッターロールの切断刃８３を受けるアンビルロール８２とを備えたエンドカット装置８０で、スリット付前駆体４’を、個々の吸収体４の寸法に切断して枚葉のスリット付前駆体４’とし、その枚葉のスリット付前駆体４’に対して、外周面に吸引孔を備えたトランスファーロール７５（巻き掛け部）を備えた第１の屈曲加工手段７０Ａを用いて、第１の柔軟化工程を行っている。トランスファーロール７５は、その回転方向において、枚葉のスリット付前駆体４’の受領部Ｐ１より手前の位置から、ベルトコンベア７９への受け渡し部Ｐ２を超える位置までの範囲Ｐ３において、外周面からの吸引が可能となっている。前記の範囲Ｐ３において、外周面からの吸引を行いつつ、枚葉のスリット付前駆体４’を、トランスファーロール７５の周面沿った形状に変形させることで、非連続体である枚葉のスリット付前駆体４’についても、スリット付前駆体４’の、ロール外周面からの浮き上がりを防止しつつ、スリットの周囲の圧着部４３ａ（圧搾部）を効率よく柔軟化させることができる。 FIG. 6 is a diagram showing another embodiment of the present invention.
In the embodiment shown in FIG. 6, the cutter roll 81 having the cutting blade 83 is formed after the slit precursor 4 ′ is formed from the absorber precursor 4 </ b> A using the cutting device 60 having the same configuration as the cutting device 60 described above. And an anvil roll 82 that receives the cutter blade 83 of the cutter roll, the slit-cured precursor 4 'is cut into the size of each absorber 4 and the single-wafer slit-cured precursor 4 is cut. The first bend processing means 70A provided with a transfer roll 75 (winding portion) provided with a suction hole on the outer peripheral surface thereof is used for the single-wafer slit precursor 4 ′. We are conducting a softening process. In the rotational direction, the transfer roll 75 is separated from the outer peripheral surface in a range P3 from a position in front of the receiving portion P1 of the sheet precursor 4 ′ with slit to a position exceeding the delivery portion P2 to the belt conveyor 79. Suction is possible. In the above-mentioned range P3, the sheet-shaped slit precursor 4 ′ is deformed into a shape along the peripheral surface of the transfer roll 75 while performing suction from the outer peripheral surface. Also with the precursor 4 ′, it is possible to efficiently soften the pressure-bonding portion 43a (squeezing portion) around the slit while preventing the precursor 4 ′ with slit from lifting from the outer peripheral surface of the roll.
　図６に示す実施態様においては、トランスファーロール７５を用いた第１の柔軟化工程後に、枚葉のスリット付前駆体４’に、帯状の連続シート７６を合流させ、その後、連続シート７６と、連続シート７６の片面上に間欠的に配置された枚葉のスリット付前駆体４’とからなる積層体７７に対して、第２の屈曲加工手段７０Ｂを用いて第２の柔軟化工程を行っている。
　第２の屈曲加工手段７０Ｂは、第１のロール７１Ａが、吸引機構を備えている点を除いて、上述した屈曲加工手段７０と同様の構成を有している。
　第１のロール７１Ａの周面には、複数の吸引孔が開口しており、開口部以外の部分は平坦となっている。第１のロール７１Ａは、周面の開口部と側面に設けた開口部とを連通する吸気路を有しており、側面に設けた開口部と該側面に対向配置した円弧状の吸引装置とが重なっている間、周面からの吸引が行われる。
　第２の屈曲加工手段７０Ｂによる第２の柔軟化工程においても、第１のロール７１Ａの周面からの吸引を行いつつ、前記の積層体７７を、第１のロール７１Ａの周面沿った形状に変形させることで、積層体７７に含まれる枚葉のスリット付前駆体４’における、スリットの周囲の圧着部４３ａ（圧搾部）を効率よく柔軟化させることができる。
　帯状の連続シート７７と積層した状態で、スリット付前駆体４’に柔軟化工程を行うことは、枚葉のスリット付前駆体４’の搬送方向Ｒにおける前端及び後端と、切断刃６４によって付けられた後方スリット４５が、第２の屈曲加工手段７０Ｂに引っ掛かる事による位相ずれや折れ曲がり、捲れ等の加工不良を抑止する利点がある。第１のロール７１Ａの吸引範囲Ｐ４は、スリット付前駆体４’の接触する範囲と同じにして、第１のロール７１Ａ上で積層体７７が曲げられている間のみ吸引保持することが、スリット付前駆体４’の浮き上がり防止の観点から好ましい。
　また、帯状の連続シート７６としては、通気性を有するシートが好ましく、例えば、通気性を有する不織布からなる表面シートの帯状原反を用いることができる。 In the embodiment shown in FIG. 6, after the first softening step using the transfer roll 75, the continuous sheet 76 having a strip shape is joined to the sheet-formed precursor 4 ′, and then the continuous sheet 76. A second softening process is performed using the second bending means 70B on the laminated body 77 composed of the sheet-shaped precursor 4 ′ with slits intermittently arranged on one side of the continuous sheet 76. ing.
The second bending means 70B has the same configuration as the bending means 70 described above, except that the first roll 71A includes a suction mechanism.
A plurality of suction holes are opened on the peripheral surface of the first roll 71A, and portions other than the opening are flat. The first roll 71A has an intake passage that communicates the opening on the circumferential surface with the opening provided on the side surface, and the opening provided on the side surface and an arcuate suction device disposed opposite to the side surface While the two are overlapped, suction from the peripheral surface is performed.
Also in the second softening step by the second bending means 70B, the laminated body 77 is shaped along the peripheral surface of the first roll 71A while performing suction from the peripheral surface of the first roll 71A. By deforming to the above, it is possible to efficiently soften the pressure-bonding portion 43a (pressing portion) around the slit in the single-sheet precursor 4 ′ with slit included in the laminate 77.
In the state of being laminated with the belt-like continuous sheet 77, the slitting precursor 4 ′ is subjected to the softening step by the front end and the rear end in the conveying direction R of the sheet precursor 4 ′ with slits, and the cutting blade 64. The attached rear slit 45 has an advantage of suppressing processing defects such as phase shift, bending, and kinking due to being caught by the second bending processing means 70B. The suction range P4 of the first roll 71A is the same as the contact range of the precursor 4 ′ with slit, and it is possible to suck and hold only while the laminated body 77 is bent on the first roll 71A. This is preferable from the viewpoint of preventing the attached precursor 4 'from being lifted.
Moreover, as the strip | belt-shaped continuous sheet 76, the sheet | seat which has air permeability is preferable, For example, the strip | belt-shaped original fabric of the surface sheet which consists of a nonwoven fabric which has air permeability can be used.
　以上の実施形態のナプキン１における各部の形成材料について説明すると、表面シート２及び裏面シート３としては、当該技術分野において従来用いられている各種のものを特に制限なく用いることができる。表面シート２としては、例えば、親水化処理が施された各種不織布や開孔フィルム等の液透過性のシートを用いることができる。また、裏面シート３としては、液不透過性の材料や撥水性の材料を用いることができる。液不透過性の材料としては、樹脂フィルムや、微細孔を有し、透湿性を有する樹脂フィルム、樹脂フィルムと不織布等とのラミネート材等を用いることができ、撥水性の材料としては、スパンボンド・メルトブローン・スパンボンド等からなる多層構造の複合不織布、スパンボンド不織布、ヒートボンド不織布、エアスルー不織布等を用いることができる。 The material for forming each part of the napkin 1 according to the above embodiment will be described. As the top sheet 2 and the back sheet 3, various materials conventionally used in the technical field can be used without any particular limitation. As the surface sheet 2, for example, liquid permeable sheets such as various nonwoven fabrics and perforated films subjected to a hydrophilic treatment can be used. Moreover, as the back sheet 3, a liquid-impermeable material or a water-repellent material can be used. As the liquid-impermeable material, a resin film, a resin film having fine pores and moisture permeability, a laminate material of a resin film and a nonwoven fabric, and the like can be used. A composite nonwoven fabric having a multilayer structure composed of bond, meltblown, spunbond, or the like, a spunbond nonwoven fabric, a heat bond nonwoven fabric, an air-through nonwoven fabric, or the like can be used.
　吸収体４を構成する吸収性シート４０１，４０２としては、湿潤した紙や不織布上に高吸収性ポリマーを散布し、その上に紙や不織布を重ね合わせた後、乾燥して一体化させた吸収性シートを用いることができる。
　このような吸収性シートとしては、例えば、特開平８－２４６３９５号公報に記載の吸収性シートを用いることもできる。
　この吸収性シートは、一枚を所定形状に裁断してシート状吸収体として用いることができる。吸収性シート１枚あたりの厚みとしては、好ましくは０．１ｍｍ以上、特に０．３ｍｍ以上であり、また２ｍｍ以下、特に１．５ｍｍ以下であることが好ましい。より具体的には、０．１ｍｍ以上２ｍｍ以下、特に０．３ｍｍ以上１．５ｍｍ以下であることが好ましい。 As the absorbent sheets 401 and 402 constituting the absorbent body 4, a superabsorbent polymer is sprayed on wet paper or nonwoven fabric, and the paper or nonwoven fabric is superimposed thereon, and then dried and integrated. Can be used.
As such an absorbent sheet, for example, an absorbent sheet described in JP-A-8-246395 can be used.
This absorbent sheet can be cut into a predetermined shape and used as a sheet-like absorber. The thickness per absorbent sheet is preferably 0.1 mm or more, particularly 0.3 mm or more, and preferably 2 mm or less, particularly 1.5 mm or less. More specifically, it is preferably 0.1 mm or more and 2 mm or less, particularly preferably 0.3 mm or more and 1.5 mm or less.
　以上、本発明をその好ましい実施形態に基づき説明したが、本発明は前記実施形態に制限されない。例えば、ナプキン１は、ウイング部７を有しないものであっても良い。また、吸収性本体５の後方部における両側に、ショーツの内面に広げて固定する後方フラップ部を有するものであっても良い。また、吸収体には、後方スリット４５を形成せず、縦スリット４３のみを形成しても良い。また、図６に示す吸収体の製造方法においては、トランスファーロール７５を用いた第１柔軟化工程を省略しても良く、第２の屈曲加工手段７１Ａを用いた、帯状の連続シートの積層や第２柔軟化工程を省略しても良い。搬送方向と平行な縦スリットに代えて、搬送方向及びその直交する方向の両方向に対して傾斜したスリットを形成しても良い。また、製造する吸収体は、多層部４２を有さず、全域に亘って吸収性シートの積層数が同じであっても良い。また、多層部４２を設ける場合の多層部４２における吸収性シートの積層数は、図２に示す枚数に限られず、多層部４２とそれ以外の部分との吸収性シートの積層枚数の差も図２に示す枚数に限られない。 As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, the napkin 1 may not have the wing part 7. Moreover, you may have a back flap part which spreads and fixes to the inner surface of shorts in the both sides in the back part of the absorptive main body 5. FIG. Further, only the longitudinal slit 43 may be formed in the absorber without forming the rear slit 45. Moreover, in the manufacturing method of the absorber shown in FIG. 6, the 1st softening process using the transfer roll 75 may be abbreviate | omitted, the lamination | stacking of a strip | belt-shaped continuous sheet using the 2nd bending process means 71A, The second softening step may be omitted. Instead of the vertical slit parallel to the transport direction, a slit inclined with respect to both the transport direction and the direction perpendicular thereto may be formed. Moreover, the absorber manufactured does not have the multilayer part 42, but the lamination | stacking number of an absorbent sheet may be the same over the whole region. Further, the number of laminated absorbent sheets in the multilayer portion 42 in the case where the multilayer portion 42 is provided is not limited to the number shown in FIG. 2, and the difference in the number of laminated absorbent sheets between the multilayer portion 42 and other portions is also illustrated. It is not limited to the number shown in 2.
　上述した実施形態においては、吸収体４を構成する本体吸収性シート４０１及び中央吸収性シート４０２は、それぞれ折り畳まれて複数層からなる積層構造となっていたが、これに代えて、枚葉の吸収性シートを複数枚積層したものでも良い。また、吸収性シートの折り畳み方も多様な折り畳み方を採用でき、例えば、補助吸収体４１は、中央吸収性シート４０２を、図８（ａ）～図８（ｄ）に示すような折り畳み方で折り畳んだものであっても良い。
　本発明の製造の対象となる吸収体はこのような形態のものに限られず、他の形態、例えばパルプ繊維と吸水性ポリマーとの積繊堆積体であってもよい。この場合、第１及び／又は第２の柔軟化工程を通過する事で圧着部４３におけるパルプ繊維間が引き剥がされて分離し、パルプの繊維間距離が広がる事によって柔軟化の効果が得られる。 In the embodiment described above, the main body absorbent sheet 401 and the central absorbent sheet 402 constituting the absorbent body 4 are each folded to form a laminated structure composed of a plurality of layers. A laminate of a plurality of absorbent sheets may be used. In addition, the absorbent sheet can be folded in various ways. For example, the auxiliary absorbent body 41 has the central absorbent sheet 402 folded as shown in FIGS. 8 (a) to 8 (d). It may be folded.
The absorbent body to be manufactured in the present invention is not limited to such a form, and may be another form, for example, a pile pile of pulp fibers and a water-absorbing polymer. In this case, by passing through the first and / or second softening step, the pulp fibers in the crimping portion 43 are peeled apart and separated, and the distance between the pulp fibers is widened to obtain the effect of softening. .
　また前記実施形態は、本発明を生理用ナプキンの吸収体の製造に適用した例であるが、本発明は、他の吸収性物品の吸収体、例えば使い捨ておむつ、失禁パッド、パンティライナ等の吸収体の製造にも同様に適用できる。 Moreover, although the said embodiment is an example which applied this invention to manufacture of the absorber of a sanitary napkin, this invention absorbs absorbers, such as a disposable diaper, an incontinence pad, a panty liner, etc. of other absorbent articles. The same applies to the manufacture of the body.
　上述した実施形態に関し、本発明は更に以下の吸収体の製造方法及び製造装置を開示する。
＜１＞
　吸収体前駆体を一方向に向けて搬送させながら、該吸収体前駆体の厚み方向に向けて切り込みを入れて、スリットを有する吸収体を製造する方法であって、
　周面に切断刃を有するカッターロールと、該カッターロールの該切断刃を受けるアンビルロールとで吸収体前駆体を挟圧し、該切断刃を該吸収体前駆体の厚み方向に沿って該吸収体前駆体内に進行させることにより、該吸収体前駆体に周囲に圧着部を有するスリットを形成するスリット形成工程と、
　前記スリットを形成した吸収体前駆体を、屈曲加工手段の巻き掛け部に巻き掛けて変形させることにより前記圧着部を柔軟化させる柔軟化工程とを具備する、吸収体の製造方法。
＜２＞
　前記吸収体は、複数の吸収層を有する積層構造を有しており、
　前記スリット形成工程においては、前記圧着部として、複数の吸収層間が圧着された圧着部を形成し、前記柔軟化工程においては、該圧着部における少なくとも一つの吸収層間を分離させて、該圧着部を柔軟化させる、＜１＞記載の吸収体の製造方法。
＜３＞
　前記屈曲加工手段は、前記巻き掛け部として、少なくとも一本のロールを備えており、少なくとも一本のロールは、前記スリットを形成した吸収体前駆体の抱き角が１０度以上１８０度以下である、＜１＞又は＜２＞記載の吸収体の製造方法。
＜４＞
　前記巻き掛け部は、表面に複数の吸引孔を有し、前記スリットを形成した吸収体前駆体を、吸引により該表面に保持しつつ変形させる、＜１＞～＜３＞の何れか１に記載の吸収体の製造方法。
＜５＞
　前記屈曲加工手段は、前記巻き掛け部を複数有しており、前記スリットを形成した吸収体前駆体を、断面Ｓ字状に屈曲させる、＜１＞～＜４＞の何れか１に記載の吸収体の製造方法。
＜６＞
　前記吸収体前駆体又は前記吸収体は、吸収性物品の***部対向部に配される部位に多層部を有しており、該多層部は、該吸収体を構成する吸収性シートの積層枚数が、その周囲に位置する部分より多い部分である、＜１＞～＜５＞の何れか１に記載の吸収体の製造方法。
＜７＞
　前記多層部は、その周囲に位置する部分よりも厚みも厚く、吸収性物品の***部対向部に配される部位に、吸収性物品の表面シート側に突出する***部を形成している、＜６＞に記載の吸収体の製造方法。
＜８＞
　前記吸収体は、吸収性シートの積層構造のみから構成されている、＜１＞～＜７＞の何れか１に記載の吸収体の製造方法。
＜９＞
　前記吸収体前駆体又は前記吸収体は、単層又は多層構造とされた吸収性シートからなり、該吸収性シートは、湿潤した紙や不織布上に高吸収性ポリマーを散布し、その上に紙や不織布を重ね合わせた後、乾燥して一体化させたものである、＜１＞～＜８＞の何れか１に記載の吸収体の製造方法。
＜１０＞
　前記スリットは、前記吸収体前駆体の搬送方向に延びる直線状に形成される、＜１＞～＜９＞の何れか１に記載の吸収体の製造方法。
＜１１＞
　前記吸収体前駆体又は前記吸収体には、吸収性物品の***部対向部に配される部位に、該吸収性物品の縦方向Ｘに沿う縦スリットが複数、分散した状態に形成されている、＜１＞～＜１０＞の何れか１に記載の吸収体の製造方法。
＜１２＞
　吸収体前駆体又は前記吸収体に、吸収性物品の縦方向Ｘに沿う縦スリットを、吸収性物品の縦方向Ｘ及び横方向Ｙの両方向に分散した状態に形成する、＜１＞～＜１０＞の何れか１に記載の吸収体の製造方法。
＜１３＞
　吸収性物品の縦方向Ｘに沿う縦スリットを、前記吸収体前駆体をその厚み方向に向けて切り込むことで形成し、該縦スリットは、前記吸収体を構成する吸収性シートの積層構造を貫通している、＜１＞～＜１２＞の何れか１に記載の吸収体の製造方法。
＜１４＞
　前記吸収体前駆体又は前記吸収体に、吸収性物品の縦方向Ｘに沿う複数の縦スリットが形成されており、各縦スリットは個々に独立しており、隣り合う縦スリットどうしの間には非スリット部が位置しており、縦スリットは、その周囲の全域が非スリット部によって囲まれている、＜１＞～＜１３＞の何れか１に記載の吸収体の製造方法。
＜１５＞
　前記吸収体は、吸収性物品の***部対向部より後方に位置する後方部に、吸収性物品の縦方向と交差する方向へ長手方向を有するように延びる複数本の後方スリットを有する、＜１＞～＜１３＞の何れか１に記載の吸収体の製造方法。
＜１６＞
　前記後方スリットは、スリットの長手方向の中央部の位置が、該長手方向の両端部の位置よりも吸収性物品の前方部側に位置する平面視形状を有し、好ましくは、該前方部側に向かって凸に湾曲した平面視形状を有している、＜１５＞に記載の吸収体の製造方法。
＜１７＞
　前記後方スリットは、吸収性物品の縦方向Ｘに間隔を開けて複数本形成されている、＜１５＞又は＜１６＞に記載の吸収体の製造方法。
＜１８＞
　前記切断刃は、その最も先端の位置に、２つの斜辺Ｌ１，Ｌ１によって形成される第１先端角θ１を有し、その最も先端の位置から若干基部寄りの位置に、各斜辺Ｌ１に連なる別の斜辺Ｌ２，Ｌ２によって形成される第２先端角θ２を有し、第１先端角θ１は、第２先端角θ２よりも大きくなっている、＜１＞～＜１６＞の何れか１に記載の吸収体の製造方法。
＜１９＞
　第１先端角θ１は４０度以上、特に６０度以上であることが好ましく、また１００度以下、特に９０度以下であることが好ましく、また第１先端角θ１は、４０度以上１００度以下、特に６０度以上９０度以下であることが好ましい、＜１８＞の何れか１に記載の吸収体の製造方法。
＜２０＞
　第２先端角θ２は、第１先端角θ１よりも小さいことを条件として、３０度以上、特に５０度以上であることが好ましく、また９０度以下、特に７０度以下であることが好ましく、また第２先端角θ２は、３０度以上９０度以下、特に５０度以上７０度以下であることが好ましい、＜１８＞又は＜１９＞に記載の吸収体の製造方法。
＜２１＞
　前記スリットを形成した吸収体前駆体であるスリット付前駆体における、スリット形成時に前記カッターロール側に位置した面を第１面ａ、スリット形成時に前記アンビルロール側に位置していた面を第２面ｂとしたときに、
　屈曲加工手段は、前記巻き掛け部として、前記スリット付前駆体を、第１面ａ側に湾曲させるロールを備えるものであるか、第２面ｂ側に湾曲させるロールを備えるものであるか、又は、第１面ａ側に湾曲させるロールと第２面ｂ側に湾曲させるロールとの両者を備えるものである、＜１＞～＜２０＞の何れか１に記載の吸収体の製造方法。
＜２２＞
　前記スリットを形成した吸収体前駆体であるスリット付前駆体における、スリット形成時に前記カッターロール側に位置した面を第１面ａ、スリット形成時に前記アンビルロール側に位置していた面を第２面ｂとしたときに、
　屈曲加工手段は、前記巻き掛け部として、前記スリット付前駆体を、第１面ａ及び第２面ｂのうちの一方の面側に湾曲させる２つのロールと、他方の面側に湾曲させる１つのロールの合計３本以上のロールを備えている、＜１＞～＜２１＞の何れか１に記載の吸収体の製造方法。 This invention discloses the manufacturing method and manufacturing apparatus of the following absorber further regarding embodiment mentioned above.
<1>
While conveying the absorber precursor in one direction, making a cut in the thickness direction of the absorber precursor, and manufacturing a absorber having a slit,
The absorber precursor is sandwiched between a cutter roll having a cutting blade on the peripheral surface and an anvil roll that receives the cutting blade of the cutter roll, and the absorber is cut along the thickness direction of the absorber precursor. A slit forming step of forming a slit having a pressure-bonding portion around the absorber precursor by proceeding into the precursor;
The manufacturing method of an absorber which comprises the softening process which softens the said crimping | compression-bonding part by winding the absorber precursor in which the said slit was formed around the winding part of a bending process means, and making it deform | transform.
<2>
The absorber has a laminated structure having a plurality of absorption layers,
In the slit forming step, as the pressure-bonding portion, a pressure-bonding portion in which a plurality of absorption layers are pressure-bonded is formed. In the softening step, at least one absorption layer in the pressure-bonding portion is separated, and the pressure-bonding portion. The manufacturing method of the absorber as described in <1> which softens.
<3>
The bending means includes at least one roll as the winding portion, and the holding angle of the absorber precursor in which the slit is formed is 10 degrees or more and 180 degrees or less. The manufacturing method of the absorber as described in <1> or <2>.
<4>
The winding portion has a plurality of suction holes on the surface, and deforms the absorber precursor in which the slit is formed while being held on the surface by suction. <1> to <3> The manufacturing method of the absorber of description.
<5>
<1> to <4>, wherein the bending means includes a plurality of the winding portions and bends the absorber precursor in which the slit is formed into an S-shaped cross section. Manufacturing method of absorber.
<6>
The absorber precursor or the absorber has a multilayer portion at a portion disposed in the excretory portion facing portion of the absorbent article, and the multilayer portion is the number of laminated absorbent sheets constituting the absorber. The method for producing an absorbent body according to any one of <1> to <5>, wherein is a portion larger than a portion located around the periphery.
<7>
The multilayer portion is thicker than the portion located around it, and forms a raised portion that protrudes toward the topsheet side of the absorbent article at a portion disposed in the excretory part facing portion of the absorbent article. The manufacturing method of the absorber as described in <6>.
<8>
The method for producing an absorbent body according to any one of <1> to <7>, wherein the absorbent body is composed only of a laminated structure of absorbent sheets.
<9>
The absorber precursor or the absorber is composed of an absorbent sheet having a single layer or a multilayer structure, and the absorbent sheet sprays a superabsorbent polymer on wet paper or non-woven fabric, on which paper The method for producing an absorbent body according to any one of <1> to <8>, wherein the nonwoven fabric and the nonwoven fabric are superposed and then dried and integrated.
<10>
The method for manufacturing an absorbent body according to any one of <1> to <9>, wherein the slit is formed in a linear shape extending in a transport direction of the absorbent body precursor.
<11>
In the absorbent body precursor or the absorbent body, a plurality of longitudinal slits along the longitudinal direction X of the absorbent article are formed in a dispersed state at a portion disposed in the excretory part facing portion of the absorbent article. <1>-<10> The manufacturing method of the absorber as described in any one of <10>.
<12>
In the absorbent body precursor or the absorbent body, longitudinal slits along the longitudinal direction X of the absorbent article are formed in a state dispersed in both the longitudinal direction X and the transverse direction Y of the absorbent article, <1> to <10 The manufacturing method of the absorber of any one of>.
<13>
A longitudinal slit along the longitudinal direction X of the absorbent article is formed by cutting the absorber precursor in the thickness direction, and the longitudinal slit penetrates the laminated structure of the absorbent sheet constituting the absorber. The method for producing an absorbent body according to any one of <1> to <12>.
<14>
A plurality of longitudinal slits along the longitudinal direction X of the absorbent article are formed in the absorber precursor or the absorber, each longitudinal slit is individually independent, and between adjacent longitudinal slits The method for producing an absorbent body according to any one of <1> to <13>, wherein the non-slit portion is located, and the vertical slit is surrounded by the non-slit portion.
<15>
The absorbent body has a plurality of rear slits extending in the rear part located behind the excretory part facing part of the absorbent article so as to have a longitudinal direction in a direction intersecting the longitudinal direction of the absorbent article. The method for producing an absorbent body according to any one of> to <13>.
<16>
The rear slit has a shape in plan view in which the position of the central portion in the longitudinal direction of the slit is located closer to the front portion side of the absorbent article than the positions of both end portions in the longitudinal direction, preferably the front portion side The manufacturing method of the absorber as described in <15> which has the shape of planar view curved convex toward the surface.
<17>
The said back slit is a manufacturing method of the absorber as described in <15> or <16> currently formed in multiple numbers at intervals in the longitudinal direction X of an absorbent article.
<18>
The cutting blade has a first tip angle θ1 formed by two hypotenuses L1, L1 at the most tip position, and is connected to each hypotenuse L1 at a position slightly closer to the base from the tip end position. <1> to <16>, which has a second tip angle θ2 formed by the hypotenuses L2 and L2, and the first tip angle θ1 is larger than the second tip angle θ2. Method for manufacturing the absorber.
<19>
The first tip angle θ1 is preferably 40 ° or more, particularly preferably 60 ° or more, and is preferably 100 ° or less, particularly preferably 90 ° or less, and the first tip angle θ1 is 40 ° or more and 100 ° or less, The method for producing an absorbent body according to any one of <18>, in particular, preferably from 60 degrees to 90 degrees.
<20>
The second tip angle θ2 is preferably 30 ° or more, particularly 50 ° or more, preferably 90 ° or less, particularly preferably 70 ° or less, provided that the second tip angle θ2 is smaller than the first tip angle θ1. The method for producing an absorbent body according to <18> or <19>, wherein the second tip angle θ2 is preferably 30 degrees or more and 90 degrees or less, particularly preferably 50 degrees or more and 70 degrees or less.
<21>
In the precursor with slit, which is the absorber precursor forming the slit, the surface located on the cutter roll side at the time of slit formation is the first surface a, and the surface located on the anvil roll side at the time of slit formation is the second. When it is set as surface b,
The bending means includes, as the winding portion, a roll that curves the precursor with slit to the first surface a side, or a roll that curves the second surface b side, Alternatively, the method for producing an absorbent body according to any one of <1> to <20>, comprising both a roll that is bent toward the first surface a and a roll that is bent toward the second surface b.
<22>
In the precursor with slit, which is the absorber precursor forming the slit, the surface located on the cutter roll side at the time of slit formation is the first surface a, and the surface located on the anvil roll side at the time of slit formation is the second. When it is set as surface b,
The bending processing means, as the winding part, causes the precursor with a slit to bend to one surface side of the first surface a and the second surface b and to bend to the other surface side 1 The method for producing an absorbent body according to any one of <1> to <21>, comprising a total of three or more rolls of one roll.
＜２３＞
　前記スリットは、前記吸収体前駆体の搬送方向における長さが２ｍｍ以上１００ｍｍ以下である、＜１＞～＜２２＞の何れか１に記載の吸収体の製造方法。
＜２４＞
　前記巻き掛け部の曲率半径は、前記スリットの前記吸収体前駆体の搬送方向における長さの４倍以下である、＜１＞～＜２３＞の何れか１に記載の吸収体の製造方法。
＜２５＞
　前記巻き掛け部の各ロールの軸間距離は、前記スリットの前記吸収体前駆体の搬送方向における長さの４倍以下である、＜１＞～＜２４＞の何れか１に記載の吸収体の製造方法。 <23>
The method for producing an absorbent body according to any one of <1> to <22>, wherein the slit has a length in the transport direction of the absorbent body precursor of 2 mm to 100 mm.
<24>
The method for manufacturing an absorbent body according to any one of <1> to <23>, wherein a radius of curvature of the winding portion is not more than four times the length of the slit in the transport direction of the absorbent body precursor.
<25>
The absorber according to any one of <1> to <24>, wherein an inter-axis distance of each roll of the winding portion is not more than four times the length of the slit in the transport direction of the absorber precursor. Manufacturing method.
＜２６＞
　前記吸収体は、吸収性物品の吸収体である、＜１＞～＜２５＞の何れか１に記載の吸収体の製造方法。
＜２７＞
　吸収性物品は、生理用ナプキン、使い捨ておむつ、失禁パッド又はパンティライナである、前記＜２６＞に記載の吸収体の製造方法。
＜２８＞
　前記スリット形成工程においては、前記吸収体の上下に配される、吸収性物品の表面シート及び裏面シートに前記スリットを形成しない、＜２６＞又は＜２７＞に記載の吸収体の製造方法。
＜２９＞
　液保持性の吸収体並びに該吸収体の肌対向面側に配置された表面シート及び該吸収体の非肌対向面側に配置された裏面シートを具備する吸収性物品の製造方法であって、
　前記吸収体を、前記＜１＞～＜２８＞の何れか１に記載の方法により製造する、吸収性物品の製造方法。 <26>
The method for producing an absorbent body according to any one of <1> to <25>, wherein the absorbent body is an absorbent body of an absorbent article.
<27>
The absorbent article according to <26>, wherein the absorbent article is a sanitary napkin, a disposable diaper, an incontinence pad, or a panty liner.
<28>
In the said slit formation process, the said slit is not formed in the surface sheet and back surface sheet of an absorbent article which are distribute | arranged above and below the said absorber, The manufacturing method of the absorber as described in <26> or <27>.
<29>
A method for producing an absorbent article comprising a liquid-retaining absorbent body, a top sheet disposed on the skin facing surface side of the absorbent body, and a back sheet disposed on the non-skin facing surface side of the absorbent body,
A method for producing an absorbent article, wherein the absorbent body is produced by the method according to any one of <1> to <28>.
　以下、実施例により本発明を更に詳細に説明する。
〔実施例１〕
　以下に示す吸収性シート（吸収層）を、吸収性シート４０１，４０２として用いて、図１及び図２に示す断面構造の帯状の吸収体前駆体４ａを製造した。
　この帯状の吸収体前駆体４ａに対して、図３及び図５に示す装置を用いて、縦スリット４３の形成及びそのスリット付前駆体に対する柔軟化加工を行い、スリット付の吸収体を得た。
　第１～第３のロールの直径は、何れも３７ｍｍとし、配置は、表１及び図８（ａ）に示す通りとした。スリット付前駆体の搬送方向に延びる直線状のスリット４３の長さは、２０ｍｍであり、各ロールの半径（曲率半径）の１．０８倍に相当する長さであった。 Hereinafter, the present invention will be described in more detail with reference to examples.
[Example 1]
Using the following absorbent sheet (absorbing layer) as the absorbent sheets 401 and 402, a strip-shaped absorber precursor 4a having a cross-sectional structure shown in FIGS. 1 and 2 was produced.
The strip-shaped absorber precursor 4a was subjected to the formation of the vertical slits 43 and the softening process for the precursor with slits using the apparatus shown in FIGS. 3 and 5 to obtain an absorber with slits. .
The diameters of the first to third rolls were all 37 mm, and the arrangement was as shown in Table 1 and FIG. The length of the linear slit 43 extending in the conveying direction of the precursor with slit was 20 mm, and was a length corresponding to 1.08 times the radius (curvature radius) of each roll.
　吸収性シート：気流に乗せて供給した架橋セルロース繊維と針葉樹パルプ、高吸水性ポリマーを重量比５：２：３で堆積させた後、接着剤としてＰＶＡ（重量比２．４％）で固めた乾式シートを使用した。本体吸収性シート４０１は坪量７５ｇ／ｍ2、厚み０．４５ｍｍ、中央吸収性シート４０２は坪量８０ｇ／ｍ2、厚み０．５０ｍｍである。なお、坪量はＪＩＳ－Ｐ８１２４に記載の方法に準じて測定し、厚みはＪＩＳ－Ｐ８１１８：１９９８に準じて測定した。但し、厚みの測定にはピーコック製卓上厚みゲージを用い、５ｃｍ×５ｃｍの測定用プレートを載せて２．５ｇ／ｃｍ2荷重下の厚みを測定した。
〔実施例２～４〕
　実施例２，３については、第１～第３のロールの配置、実施例４については、第１～第３のロールの配置及び第１のロールへの吸収体前駆体４ａの導入位置を代えた以外は、実施例１と同様にして、スリット付の吸収体を得た。なお、第１～第３ロールの配置については、実施例２が表１及び図８（ｂ）に示す通り、実施例３が表１及び図８（ｃ）に示す通り、実施例４が表１及び図８（ｄ）に示す通りとした。 Absorbent sheet: Cross-linked cellulose fiber, softwood pulp, and superabsorbent polymer supplied in an air stream were deposited at a weight ratio of 5: 2: 3, and then solidified with PVA (2.4% by weight) as an adhesive A dry sheet was used. The main body absorbent sheet 401 has a basis weight of 75 g / m 2 and a thickness of 0.45 mm, and the central absorbent sheet 402 has a basis weight of 80 g / m 2 and a thickness of 0.50 mm. The basis weight was measured according to the method described in JIS-P8124, and the thickness was measured according to JIS-P8118: 1998. However, the thickness was measured using a peacock-made desk thickness gauge, and a thickness of 2.5 cm / cm 2 was measured by placing a 5 cm × 5 cm measuring plate.
[Examples 2 to 4]
For Examples 2 and 3, the arrangement of the first to third rolls was changed. For Example 4, the arrangement of the first to third rolls and the introduction position of the absorber precursor 4a to the first roll were changed. Except that, an absorber with a slit was obtained in the same manner as in Example 1. Regarding the arrangement of the first to third rolls, Example 2 is shown in Table 1 and FIG. 8B, Example 3 is shown in Table 1 and FIG. 8C, and Example 4 is shown in FIG. 1 and as shown in FIG.
〔比較例１〕
　屈曲加工を行わない以外は、実施例１と同様にして、スリット付の吸収体を得た。 [Comparative Example 1]
Except not performing a bending process, it carried out similarly to Example 1, and obtained the absorber with a slit.
〔評価〕
　実施例及び比較例で得られた吸収体について、下記方法により、多層部の長手方向中央部における曲げ剛性を測定して、その結果を表１に示した。
〔曲げ剛性の測定方法〕
　ＪＩＳ　Ｌ－１０９６（一般織物試験方法）に準じて、吸収体曲げ剛性の評価を行った。評価装置は、大栄科学精器製作所社製のハンドロメーター（型式：ＨＯＭ－３）を用いた。ハンドロメーターの凹溝の幅は２０ｍｍに設定した。
　得られたスリット付の吸収体を、上記ハンドロメーターの支持台上に、吸収体の多層部の長手方向中心部が凹溝の中央に位置するように載置し、吸収体を幅方向で曲げた時の曲げ剛性の評価を行った。 [Evaluation]
About the absorber obtained by the Example and the comparative example, the bending rigidity in the longitudinal direction center part of a multilayer part was measured with the following method, and the result was shown in Table 1.
[Measurement method of bending stiffness]
The absorber bending stiffness was evaluated according to JIS L-1096 (General Textile Testing Method). As an evaluation device, a handometer (model: HOM-3) manufactured by Daiei Scientific Instruments Co., Ltd. was used. The width of the groove of the handometer was set to 20 mm.
The obtained absorbent body with a slit is placed on the support table of the handometer so that the longitudinal center of the multilayer portion of the absorbent body is located at the center of the concave groove, and the absorbent body in the width direction. The bending stiffness when bent was evaluated.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１に示す結果の比較から、本発明の方法によれば、スリットの周縁部が柔軟で、全体としても柔軟性に優れた吸収体を効率よく製造することが判る。 From the comparison of the results shown in Table 1, it can be seen that according to the method of the present invention, the peripheral portion of the slit is flexible, and an absorber having excellent flexibility as a whole is efficiently produced.
　本発明によれば、柔軟なスリットを有する吸収体を効率よく製造することができる。 According to the present invention, an absorber having a flexible slit can be efficiently manufactured.

Claims (29)

  1. 　吸収体前駆体を一方向に向けて搬送させながら、該吸収体前駆体の厚み方向に向けて切り込みを入れて、スリットを有する吸収体を製造する方法であって、
    　周面に切断刃を有するカッターロールと、該カッターロールの該切断刃を受けるアンビルロールとで吸収体前駆体を挟圧し、該切断刃を該吸収体前駆体の厚み方向に沿って該吸収体前駆体内に進行させることにより、該吸収体前駆体に周囲に圧搾部を有するスリットを形成するスリット形成工程と、
    　前記スリットを形成した吸収体前駆体を、屈曲加工手段の巻き掛け部に巻き掛けて変形させることにより前記圧搾部を柔軟化させる柔軟化工程とを具備する、吸収体の製造方法。     While conveying the absorber precursor in one direction, making a cut in the thickness direction of the absorber precursor, and manufacturing a absorber having a slit,
    The absorber precursor is sandwiched between a cutter roll having a cutting blade on the peripheral surface and an anvil roll that receives the cutting blade of the cutter roll, and the absorber is cut along the thickness direction of the absorber precursor. A slit forming step of forming a slit having a squeezed portion around the absorber precursor by proceeding into the precursor;
    The manufacturing method of an absorber which comprises the softening process which softens the said pressing part by winding the absorber precursor in which the said slit was formed around the winding part of a bending process means, and making it deform | transform.
  2. 　前記吸収体は、複数の吸収層を有する積層構造を有しており、
    　前記スリット形成工程においては、前記圧搾部として、複数の吸収層間が圧着された圧着部を形成し、前記柔軟化工程においては、該圧着部における少なくとも一つの吸収層間を分離させて、該圧着部を柔軟化させる、請求項１に記載の吸収体の製造方法。     The absorber has a laminated structure having a plurality of absorption layers,
    In the slit forming step, a pressure-bonding portion in which a plurality of absorption layers are pressure-bonded is formed as the pressing portion, and in the softening step, at least one absorption layer in the pressure-bonding portion is separated, and the pressure-bonding portion The manufacturing method of the absorber of Claim 1 which softens.
  3. 　前記屈曲加工手段は、前記巻き掛け部として、少なくとも一本のロールを備えており、少なくとも一本のロールは、前記スリットを形成した吸収体前駆体の抱き角が１０度以上１８０度以下である、請求項１又は２に記載の吸収体の製造方法。 The bending means includes at least one roll as the winding portion, and the holding angle of the absorber precursor in which the slit is formed is 10 degrees or more and 180 degrees or less. The manufacturing method of the absorber of Claim 1 or 2.
  4. 　前記巻き掛け部は、表面に複数の吸引孔を有し、前記スリットを形成した吸収体前駆体を、吸引により該表面に保持しつつ変形させる、請求項１～３の何れか１項に記載の吸収体の製造方法。 The wound portion has a plurality of suction holes on a surface thereof, and deforms the absorber precursor formed with the slits while being held on the surface by suction. Method for manufacturing the absorber.
  5. 　前記屈曲加工手段は、前記巻き掛け部を複数有しており、前記スリットを形成した吸収体前駆体を、断面Ｓ字状に屈曲させる、請求項１～４の何れか１項に記載の吸収体の製造方法。 The absorption according to any one of claims 1 to 4, wherein the bending means has a plurality of the winding portions, and bends the absorber precursor in which the slit is formed into an S-shaped cross section. Body manufacturing method.
  6. 　前記吸収体前駆体又は前記吸収体は、吸収性シートが複数層積層されてなる積層構造を有し、吸収性物品の***部対向部に配される部位に多層部を有しており、該多層部は、前記吸収性シートの積層枚数が、その周囲に位置する部分より多い部分である、請求項１～５の何れか１項に記載の吸収体の製造方法。 The absorber precursor or the absorber has a laminated structure in which a plurality of layers of absorbent sheets are laminated, and has a multilayer portion at a portion disposed in the excretory portion facing portion of the absorbent article, The method for producing an absorbent body according to any one of claims 1 to 5, wherein the multilayer part is a part in which the number of laminated absorbent sheets is larger than a part located around the absorbent sheet.
  7. 　前記多層部は、その周囲に位置する部分よりも厚みも厚く、吸収性物品の***部対向部に配される部位に、吸収性物品の表面シート側に突出する***部を形成している、請求項６に記載の吸収体の製造方法。 The multilayer portion is thicker than the portion located around it, and forms a raised portion that protrudes toward the topsheet side of the absorbent article at a portion disposed in the excretory part facing portion of the absorbent article. The manufacturing method of the absorber of Claim 6.
  8. 　前記吸収体は、吸収性シートの積層構造のみから構成されている、請求項１～７の何れか１項に記載の吸収体の製造方法。 The method for producing an absorbent body according to any one of claims 1 to 7, wherein the absorbent body is composed only of a laminated structure of absorbent sheets.
  9. 　前記吸収体前駆体又は前記吸収体は、単層又は多層構造とされた吸収性シートからなり、該吸収性シートは、湿潤した紙又は不織布上に高吸収性ポリマーを散布し、その上に紙又は不織布を重ね合わせた後、乾燥して一体化させたものである、請求項１～８の何れか１項に記載の吸収体の製造方法。 The absorber precursor or the absorber is composed of an absorbent sheet having a single layer or a multilayer structure, and the absorbent sheet spreads a superabsorbent polymer on wet paper or non-woven fabric, on which paper is formed. The method for producing an absorbent body according to any one of claims 1 to 8, wherein the nonwoven fabrics are laminated and then dried and integrated.
  10. 　前記スリットは、前記吸収体前駆体の搬送方向に延びる直線状に形成される、請求項１～９の何れか１項に記載の吸収体の製造方法。 The method of manufacturing an absorbent body according to any one of claims 1 to 9, wherein the slit is formed in a linear shape extending in a transport direction of the absorbent body precursor.
  11. 　前記吸収体前駆体又は前記吸収体には、吸収性物品の***部対向部に配される部位に、該吸収性物品の縦方向に沿う縦スリットが複数、分散した状態に形成されている、請求項１～１０の何れか１項に記載の吸収体の製造方法。 In the absorbent body precursor or the absorbent body, a plurality of longitudinal slits along the longitudinal direction of the absorbent article are formed in a dispersed state at a portion disposed in the excretory part facing portion of the absorbent article. The method for producing an absorbent body according to any one of claims 1 to 10.
  12. 　吸収体前駆体又は前記吸収体に、吸収性物品の縦方向に沿う縦スリットを、吸収性物品の縦方向及び横方向の両方向に分散した状態に形成する、請求項１～１０の何れか１項に記載の吸収体の製造方法。 11. The absorbent body precursor or the absorbent body, wherein longitudinal slits along the longitudinal direction of the absorbent article are formed in a state dispersed in both the longitudinal direction and the lateral direction of the absorbent article. The manufacturing method of the absorber as described in a term.
  13. 　前記スリット形成工程において、吸収性物品の縦方向に沿う縦スリットを、前記吸収体前駆体をその厚み方向に向けて切り込むことで形成し、該縦スリットは、前記吸収体を構成する吸収性シートの積層構造を貫通している、請求項１～１２の何れか１項に記載の吸収体の製造方法。 In the slit forming step, a longitudinal slit along the longitudinal direction of the absorbent article is formed by cutting the absorbent body precursor in the thickness direction, and the longitudinal slit forms the absorbent sheet. The method for producing an absorbent body according to any one of claims 1 to 12, which penetrates the laminated structure.
  14. 　前記吸収体前駆体又は前記吸収体に、吸収性物品の縦方向に沿う複数の縦スリットが形成されており、各縦スリットは個々に独立しており、隣り合う縦スリットどうしの間には非スリット部が位置しており、縦スリットは、その周囲の全域が非スリット部によって囲まれている、請求項１～１３の何れか１項に記載の吸収体の製造方法。 A plurality of longitudinal slits along the longitudinal direction of the absorbent article are formed in the absorber precursor or the absorber, each longitudinal slit is individually independent, and there is no non-interval between adjacent longitudinal slits. The method for manufacturing an absorbent body according to any one of claims 1 to 13, wherein the slit portion is located, and the entire periphery of the vertical slit is surrounded by the non-slit portion.
  15. 　前記吸収体は、吸収性物品の***部対向部より後方に位置する後方部に、吸収性物品の縦方向と交差する方向へ長手方向を有するように延びる複数本の後方スリットを有する、請求項１～１３の何れか１項に記載の吸収体の製造方法。 The absorbent body has a plurality of rear slits extending in the rear part located behind the excretory part facing part of the absorbent article so as to have a longitudinal direction in a direction intersecting the longitudinal direction of the absorbent article. 14. The method for producing an absorbent body according to any one of 1 to 13.
  16. 　前記後方スリットは、スリットの長手方向の中央部の位置が、該長手方向の両端部の位置よりも吸収性物品の前方部側に向かって凸に湾曲した平面視形状を有している、請求項１５に記載の吸収体の製造方法。 The rear slit has a plan view shape in which the position of the center portion in the longitudinal direction of the slit is curved more convexly toward the front portion side of the absorbent article than the positions of both end portions in the longitudinal direction. Item 16. A method for producing an absorbent body according to Item 15.
  17. 　前記後方スリットは、吸収性物品の縦方向Ｘに間隔を開けて複数本形成されている、請求項１５又は１６に記載の吸収体の製造方法。 The method of manufacturing an absorbent body according to claim 15 or 16, wherein a plurality of the rear slits are formed at intervals in the longitudinal direction X of the absorbent article.
  18. 　前記切断刃は、その最も先端の位置に、２つの斜辺によって形成される第１先端角を有し、その最も先端の位置から若干基部寄りの位置に、各該斜辺に連なる別の斜辺によって形成される第２先端角を有し、該第１先端角は、該第２先端角よりも大きくなっている、請求項１～１６の何れか１項に記載の吸収体の製造方法。 The cutting blade has a first tip angle formed by two hypotenuses at the most tip position, and is formed by another hypotenuse connected to each hypotenuse at a position slightly closer to the base from the tip end position. The method for manufacturing an absorbent body according to any one of claims 1 to 16, wherein the first tip angle is larger than the second tip angle.
  19. 　前記第１先端角は４０度以上１００度以下である、請求項１８に記載の吸収体の製造方法。 The method for manufacturing an absorbent body according to claim 18, wherein the first tip angle is not less than 40 degrees and not more than 100 degrees.
  20. 　前記第２先端角は、前記第１先端角よりも小さく、且つ３０度以上９０度以下である、請求項１８又は１９に記載の吸収体の製造方法。 The method for manufacturing an absorbent body according to claim 18 or 19, wherein the second tip angle is smaller than the first tip angle and not less than 30 degrees and not more than 90 degrees.
  21. 　前記スリットを形成した吸収体前駆体であるスリット付前駆体における、スリット形成時に前記カッターロール側に位置した面を第１面、スリット形成時に前記アンビルロール側に位置していた面を第２面としたときに、
    　前記屈曲加工手段は、前記巻き掛け部として、前記スリット付前駆体を、前記第１面側に湾曲させるロールを備えるものであるか、前記第２面側に湾曲させるロールを備えるものであるか、又は、前記第１面側に湾曲させるロールと前記第２面側に湾曲させるロールとの両者を備えるものである、請求項１～２０の何れか１項に記載の吸収体の製造方法。     In the precursor with slit, which is the absorber precursor that has formed the slit, the surface located on the cutter roll side during slit formation is the first surface, and the surface located on the anvil roll side during slit formation is the second surface And when
    Whether the bending means includes, as the winding portion, a roll that curves the precursor with slit to the first surface side or a roll that curves the second surface side. The method for producing an absorbent body according to any one of claims 1 to 20, further comprising both a roll that is bent toward the first surface and a roll that is bent toward the second surface.
  22. 　前記スリットを形成した吸収体前駆体であるスリット付前駆体における、スリット形成時に前記カッターロール側に位置した面を第１面、スリット形成時に前記アンビルロール側に位置していた面を第２面としたときに、
    　前記屈曲加工手段は、前記巻き掛け部として、前記スリット付前駆体を、前記第１面及び前記第２面のうちの一方の面側に湾曲させる２つのロールと、他方の面側に湾曲させる１つのロールの合計３本以上のロールを備えている、請求項１～２１の何れか１項に記載の吸収体の製造方法。     In the precursor with slit, which is the absorber precursor that has formed the slit, the surface located on the cutter roll side during slit formation is the first surface, and the surface located on the anvil roll side during slit formation is the second surface And when
    The bending means, as the winding portion, causes the precursor with slit to bend to two rolls for bending one of the first surface and the second surface and to the other surface. The method for producing an absorbent body according to any one of claims 1 to 21, comprising a total of three or more rolls of one roll.
  23. 　前記スリットは、前記吸収体前駆体の搬送方向における長さが２ｍｍ以上１００ｍｍ以下である、請求項１～２２の何れか１項に記載の吸収体の製造方法。 The method for manufacturing an absorber according to any one of claims 1 to 22, wherein the slit has a length in the transport direction of the absorber precursor of 2 mm or more and 100 mm or less.
  24. 　前記巻き掛け部の曲率半径は、前記スリットの前記吸収体前駆体の搬送方向における長さの４倍以下である、請求項１～２３の何れか１項に記載の吸収体の製造方法。 The method for manufacturing an absorbent body according to any one of claims 1 to 23, wherein a radius of curvature of the winding portion is not more than four times the length of the slit in the transport direction of the absorbent body precursor.
  25. 　前記巻き掛け部の各ロールの軸間距離は、前記スリットの前記吸収体前駆体の搬送方向における長さの４倍以下である、請求項１～２４の何れか１項に記載の吸収体の製造方法。 The distance between the axes of each roll of the winding portion is not more than four times the length of the slit in the conveyance direction of the absorber precursor. Production method.
  26. 　前記吸収体は、吸収性物品の吸収体である、請求項１～２５の何れか１項に記載の吸収体の製造方法。 The method for producing an absorbent body according to any one of claims 1 to 25, wherein the absorbent body is an absorbent body of an absorbent article.
  27. 　吸収性物品は、生理用ナプキン、使い捨ておむつ、失禁パッド又はパンティライナである、請求項２６に記載の吸収体の製造方法。 The absorbent article according to claim 26, wherein the absorbent article is a sanitary napkin, a disposable diaper, an incontinence pad or a panty liner.
  28. 　前記スリット形成工程においては、前記吸収体の上下に配される、吸収性物品の表面シート及び裏面シートに前記スリットを形成しない、請求項２６又は２７に記載の吸収体の製造方法。 28. The method for manufacturing an absorbent body according to claim 26 or 27, wherein, in the slit forming step, the slit is not formed on a top sheet and a back sheet of an absorbent article disposed above and below the absorbent body.
  29. 　液保持性の吸収体並びに該吸収体の肌対向面側に配置された表面シート及び該吸収体の非肌対向面側に配置された裏面シートを具備する吸収性物品の製造方法であって、
    　前記吸収体を、請求項１～２８の何れか１項に記載の方法により製造する、吸収性物品の製造方法。     A method for producing an absorbent article comprising a liquid-retaining absorbent body, a top sheet disposed on the skin facing surface side of the absorbent body, and a back sheet disposed on the non-skin facing surface side of the absorbent body,
    A method for producing an absorbent article, wherein the absorbent body is produced by the method according to any one of claims 1 to 28.
PCT/JP2015/052149 2014-02-28 2015-01-27 Production method for absorbent body WO2015129367A1 (en)

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