WO2023233785A1 - Article absorbant et procédé de production d'absorbeur pour articles absorbants - Google Patents

Article absorbant et procédé de production d'absorbeur pour articles absorbants Download PDF

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Publication number
WO2023233785A1
WO2023233785A1 PCT/JP2023/012774 JP2023012774W WO2023233785A1 WO 2023233785 A1 WO2023233785 A1 WO 2023233785A1 JP 2023012774 W JP2023012774 W JP 2023012774W WO 2023233785 A1 WO2023233785 A1 WO 2023233785A1
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WO
WIPO (PCT)
Prior art keywords
basis weight
weight portion
absorbent
low basis
area
Prior art date
Application number
PCT/JP2023/012774
Other languages
English (en)
Japanese (ja)
Inventor
真里子 永島
Original Assignee
大王製紙株式会社
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Filing date
Publication date
Application filed by 大王製紙株式会社 filed Critical 大王製紙株式会社
Publication of WO2023233785A1 publication Critical patent/WO2023233785A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—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
    • 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

Definitions

  • the present invention relates to an absorbent article and a method for manufacturing an absorbent core for an absorbent article.
  • absorbent articles such as sanitary napkins, products with a long overall length that can be used for long periods of time or at night and that can face the back of the wearer's buttocks are known.
  • a structure is being considered in which the main body can be closely attached to the rear along the shape of the body to prevent leakage of body fluids.
  • an intermediate region extending in the width direction is formed on the rear side of the center of the wing in the front-rear direction and on the front side of the rear end edge of the absorbent core, and the basis weight of the absorbent material in the intermediate region is
  • An absorbent article is described in which the basis weight is lower than the basis weight of the first region and the second region before and after the first region and the second region. It is also described that this configuration prevents bodily fluids from leaking rearward when the wearer is lying on his or her back.
  • an object of one aspect of the present invention is to provide an absorbent article that has excellent fit over the front and back of the wearer's body and can prevent leakage of bodily fluids.
  • One aspect of the present invention is an elongated absorbent article comprising a skin-side top sheet, a non-skin side back sheet, and an absorbent body disposed between the top sheet and the back sheet,
  • the absorbent body has a middle basis weight part and a low basis weight part adjacent to the middle basis weight part and having a lower basis weight than the middle basis weight part, and the low basis weight part has a front low basis weight part and a front low basis weight part. and a rear low basis weight portion having a width shorter than that of the absorbent body, and the longitudinal length of the front low basis weight portion is 40 to 120% of the lateral length of the absorbent body.
  • an absorbent article that has excellent fit over the front and back of the wearer's body and can prevent leakage of bodily fluids.
  • FIG. 1 is a plan view of an absorbent article according to an embodiment as viewed from the skin side. This is a cross section taken along line II in FIG. 1.
  • 2 is a cross section taken along line II-II in FIG. 1.
  • FIG. 2 is a plan view of the absorbent article of FIG. 1 with the absorbent body exposed.
  • 5 is a partially enlarged view of the absorber shown in FIG. 4.
  • FIG. FIG. 2 is a schematic cross-sectional view showing a state in which an absorbent article is attached. It is a figure which shows the variation of another planar view shape of a low basis weight part.
  • FIG. 7 is a plan view of an absorbent article according to a modified example, with the absorbent body exposed. 9 is a partially enlarged view of FIG. 8.
  • FIG. 1 is a schematic diagram showing an apparatus for manufacturing an absorbent article. It is a top view of the absorbent type used in the manufacturing method of the absorbent article according to this embodiment.
  • 12 is a partially enlarged view of FIG. 11 (an enlarged view of portion P1 and portion P2).
  • FIG. FIG. 12 is a cross-sectional view of FIG. 11; It is a top view of the absorbent type used in the manufacturing method of the absorbent article by a modification.
  • 15 is a partially enlarged view of FIG. 14 (an enlarged view of portion P3).
  • FIG. 15 is a cross-sectional view of FIG. 14.
  • FIG. FIG. 3 is a plan view for explaining folding positions when individually packaged.
  • 18 is a schematic cross-sectional view taken along the line III-III in FIG. 17.
  • FIG. FIG. 18 is a schematic cross-sectional view of the individually packaged absorbent article obtained from the state shown in FIG. 17.
  • the absorbent article according to the present embodiment may be a sanitary napkin, a diaper, a pad for light incontinence, etc., but below, the basic structure of the absorbent article according to the present embodiment will be explained. This will be explained using napkins as an example.
  • FIG. 1 shows a plan view of the absorbent article 1. Further, FIG. 2 shows a sectional view taken along the line II in FIG. 1, and FIG. 3 shows a sectional view taken along the line II-II in FIG.
  • the absorbent article 1 includes a liquid-permeable top sheet 3 placed on the side that faces the wearer's skin when worn, that is, the skin side, and a liquid-permeable top sheet 3 placed on the side opposite to the skin side.
  • a liquid-impermeable back sheet 2 is provided on the non-skin side (underwear side).
  • an absorbent body (absorbent core) 4 is arranged between the backsheet 2 and the topsheet 3.
  • the backsheet 2, absorbent body 4, and topsheet 3 are laminated to form a main body (absorbent article main body) 8.
  • the absorbent core 4 is arranged so as not to protrude from the backsheet 2 and topsheet 3 in plan view. At both ends in the longitudinal direction D1, the edges of the backsheet 2 and the edges of the topsheet 3 may be joined by adhesive, heat sealing, or the like.
  • the absorbent article 1 has an elongated pad shape (a shape whose thickness is smaller than its width and length).
  • the longitudinal direction (front-back direction) of the absorbent article 1 is referred to as D1
  • the lateral direction (left-right direction or width direction) perpendicular to the longitudinal direction D1 is referred to as D2.
  • the longitudinal direction D1 is a direction corresponding to the front-back direction of the wearer's body when the absorbent article 1 is worn
  • the lateral direction D2 is a direction corresponding to the left-right direction of the body.
  • the main body 8 has a planar shape that is approximately symmetrical with respect to a center line (longitudinal center line) CL extending in the longitudinal direction D1, but the shape of the main body 8 is It does not necessarily have to be line symmetric.
  • configurations other than the shapes of the absorbent article 1 and main body 8 may be approximately symmetrical with respect to the center line CL as an axis of symmetry, or may be asymmetrical.
  • the back sheet 2 may be a sheet that has at least water-blocking properties, and may be, for example, a sheet made of olefin resin such as polyethylene or polypropylene. Further, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or a laminated sheet of a nonwoven fabric with a waterproof film interposed therebetween to ensure substantially liquid impermeability, etc. can be used. Furthermore, from the viewpoint of preventing stuffiness, it is more desirable to use a material having moisture permeability.
  • Such water-impermeable and moisture-permeable sheet materials are made by melt-kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching the sheet in uniaxial or biaxial directions.
  • An olefin resin such as polyethylene or polypropylene
  • a porous sheet or the like can be used.
  • the backsheet 2 may be a sheet having the same external shape as the absorbent article 1.
  • the top sheet 3 can be a liquid-permeable sheet that quickly allows body fluids such as menstrual blood, vaginal discharge, and urine to pass through.
  • a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like is suitably used.
  • the material fibers constituting the nonwoven fabric include, for example, olefins such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupro, blended fibers thereof, and natural fibers such as cotton, either singly or Two or more types can be used in combination.
  • processing methods for nonwoven fabrics include spunlace method, spunbond method, thermal bond method, melt blown method, needle punch method, and the like.
  • the spunlace method is preferred because it can produce a nonwoven fabric with excellent flexibility
  • the spunbond method is preferred because it can produce a nonwoven fabric with excellent drapability
  • the thermal bonding method is preferred because it can produce a bulky and soft nonwoven fabric.
  • composite fibers such as core-sheath type fibers, side-by-side type fibers, split type fibers, etc., which have a fiber with a high melting point as a core and a fiber with a low melting point as a sheath, can also be used.
  • the absorbent body 4 is not limited to any material as long as it can absorb and retain body fluids, but preferably contains cotton-like pulp and a water-absorbing polymer.
  • a water-absorbing polymer superabsorbent polymer granules (SAP), superabsorbent fibers (SAF), and combinations thereof can be used.
  • SAP superabsorbent polymer granules
  • SAF superabsorbent fibers
  • the pulp include chemical pulp obtained from wood, cellulose fibers such as dissolving pulp, and those made of artificial cellulose fibers such as rayon and acetate.
  • raw materials for chemical pulp hardwoods, softwoods, etc. are used, and softwoods are preferably used because of their long fiber length.
  • Synthetic fibers may be mixed in the absorber 4.
  • synthetic fibers polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used, and two of these may be used in combination. You can also do it.
  • Composite fibers such as core-sheath type fibers, side-by-side type fibers, split type fibers, etc., which have a core of fibers with a high melting point and a sheath of fibers with a low melting point, can also be used. Note that it is also possible to use hydrophobic fibers whose surface is treated with a hydrophilizing agent to impart affinity for body fluids.
  • the absorbent body 4 is preferably manufactured by a fiber stacking or air laying method.
  • the absorbent body 4 may be formed with a plurality of compressed absorbent portions that are partially recessed from the top sheet 3 side to the back sheet 2 side and are spaced apart from each other in a plan view.
  • the absorbent body 4 may be wrapped with an enveloping sheet made of colored or non-colored (white) crepe paper, nonwoven fabric, etc., in order to prevent twisting or cracking or spillage of polymer particles. good.
  • the specific structure of the absorber 4 and a preferred manufacturing method will be described in detail later.
  • side sheets 7, 7 are arranged on the skin side along the longitudinal direction D1.
  • the side sheet 7 is constructed using a material that has been entirely or partially subjected to an appropriate water-repellent treatment or hydrophilic treatment, depending on the purpose of preventing the penetration of body fluids or enhancing the texture. It may be. It is preferable that the side sheet 7 is a nonwoven fabric containing natural fibers, synthetic fibers, recycled fibers, etc., or made of these fibers.
  • the side sheet 7 When the side sheet 7 is a nonwoven fabric, it may be an air-through nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, etc., but from the viewpoint of being soft and resistant to creases and wrinkles, it can improve the feel to the touch. Preferably, it is an air-through nonwoven fabric.
  • the side sheet 7 may be water-repellent treated with a silicon-based, paraffin-based, or the like water repellent.
  • the side sheet 7 may be folded back on the inside in the lateral direction D2 and formed as a multi-layered band-shaped portion extending along the side of the main body 8. Gathers may be formed by arranging elastic elastic members in a stretched state along the longitudinal direction D1 between the plurality of layers. In this specification, the folding of the side sheet 7 and the structure of the gathers will not be explained, and will not be illustrated in the drawings.
  • the absorbent article 1 has a body fluid discharge port facing region C that faces the wearer's body fluid discharge port (vaginal opening in the illustrated example) when worn, and a body fluid discharge port facing region C that is adjacent to the front of the body fluid discharge port facing region C and that is adjacent to the front side of the body fluid discharge port facing region C and A front region F which is the region up to the front end, a perineum facing region (intermediate region) M adjacent to the rear of the body fluid outlet facing region C and facing near the wearer's perineum when worn, and a perineum facing region M
  • the absorbent article may include a buttock-facing region B that is adjacent to the rear of the absorbent article and extends to the rear end of the absorbent article 1 and faces the buttock of the wearer when worn.
  • the buttock-facing region B includes a front buttock-facing region B1 adjacent to the perineum-facing region M, and a rear buttock-facing region B2 adjacent to the rear of the front buttock-facing region B1.
  • the front buttock facing region B1 is a region that mainly faces the intergluteal cleft (buttock groove), and is a region that faces a region including the anus.
  • the rear buttock facing area B2 is a region that can face the area behind the gluteal cleft or further back from the vicinity of the rear end of the gluteal cleft, particularly the area behind (in the standing state, above) the gluteal groove, which can be said to be the boundary between the buttocks and legs.
  • the length in the longitudinal direction D1 of the body fluid outlet facing region C may be 50 to 120 mm, and the length in the longitudinal direction D1 of the buttocks facing region B may be 90 to 230 mm. Further, in the configuration according to the present embodiment, for example, the total length of the perineum facing region M and the buttock facing region B, preferably the length D1 in the longitudinal direction of the buttock facing region B, is set in the longitudinal direction in which the wing flap WF is provided. This is suitable for absorbent articles with a long rear part, which is greater than the length of D1.
  • the length in the longitudinal direction D1 of the front buttock-facing region (gluteal cleft-facing region) B1 may be 40 to 100 mm, and the length in the longitudinal direction D1 of the rear buttock-facing region B2 may be 40 to 120 mm. Further, the total length of the absorbent article 1 in the longitudinal direction D1 may be 250 to 450 mm.
  • the absorbent article 1 may include a pair of wing flaps WF, WF extending outward in the lateral direction D2 from both sides of the body fluid outlet facing region C, respectively.
  • An anti-slip material (not shown) may be provided on the non-skin side of the wing flaps WF, WF, and this anti-slip material allows the wing flaps WF, WF and the main body 8 to sandwich the underwear when worn.
  • Wing flaps WF and WF can be folded back to the non-skin side and attached to underwear. Thereby, the absorbent article 1 can be securely fixed to the underwear.
  • the wing flaps WF, WF are formed by joining the outwardly extending portions of the side sheets 7, 7 in the lateral direction D2 and the outwardly extending portions of the backsheet 2 in the lateral direction D2.
  • a pair of hip hold flaps HF, HF may be formed extending from the side of the main body 8 outward in the lateral direction D2 from the perineum facing region M to the buttock facing region B.
  • the hip hold flaps HF, HF prevent the leakage of body fluids at the rear of the absorbent article 1, and by increasing the contact area with the buttocks, the entire absorbent article 1 is held against the underwear, especially in the lateral direction D2. It also has the function of making it difficult to shift and stabilizing the mounting position of the absorbent article 1.
  • the hip hold flaps HF, HF may also be formed by joining the outwardly extending portions of the side sheets 7, 7 in the lateral direction D2 and the outwardly extending portions of the backsheet 2 in the lateral direction D2.
  • FIG. 4 shows a plan view of the absorbent article 1 of FIG. 1 in which the top sheet 3 and side sheets 7, 7 are removed to expose the absorbent core 4.
  • the basis weight of the absorbent body 4 specifically, the pulp basis weight (or fiber basis weight) is not uniform throughout, but differs depending on the location.
  • the absorbent body 4 mainly has a medium basis weight portion 4M having a medium basis weight, a high basis weight portion 4H having a higher basis weight than the medium basis weight portion 4M, and a low basis weight portion 4L having a lower basis weight than the medium basis weight portion 4M.
  • the low basis weight portion 4L includes a front low basis weight portion 4Lf having the same width as the absorbent body 4 disposed in the perineum facing region M, and a rear low basis weight portion 4Lb elongated in the longitudinal direction D1 disposed in the intergluteal cleft facing region B1. and has. It is preferable that the rear low basis weight portion 4Lb is formed at the center in the lateral direction D2 so as to straddle the longitudinal center line.
  • the middle fabric weight part 4M may have a front middle fabric weight part 4Mf mainly formed in the body fluid outlet facing area C, and a rear middle fabric weight part 4Mb mainly formed in the rear buttock facing area B2.
  • the absorbent body 4 contains pulp (or a fibrous material mainly composed of pulp) and a water-absorbing polymer as described above, but the basis weight of the water-absorbing polymer is the same throughout the absorbent body 4. It is preferable to have one. In that case, the magnitude relationship of the pulp basis weight is reflected in the magnitude relationship of the pulp basis weight.
  • the basis weight of the low basis weight portion 4L is preferably 200 to 500 gsm, more preferably 300 to 400 gsm.
  • the basis weight of the middle basis weight portion 4M may be preferably 300 to 600 gsm, more preferably 400 to 500 gsm.
  • the high basis weight portion 4H preferably has a basis weight of 500 to 850 gsm, more preferably 600 to 750 gsm.
  • the basis weight of the low basis weight portion 4L may be 60 to 90% of the basis weight of the medium basis weight portion 4M.
  • the above-mentioned basis weight can be a pulp basis weight.
  • the low basis weight portion 4L, medium basis weight portion 4M, and high basis weight portion 4H may be uniform basis weight areas in which the basis weight is approximately uniform within each portion. Approximately uniform basis weight within a predetermined portion or predetermined area means that even if there are some areas where the basis weight is slightly different, the difference from the average basis weight within the predetermined portion or area is 20% or less of the average basis weight, Preferably it is 10% or less, more preferably 5% or less.
  • the front low basis weight portion 4Lf and the rear low basis weight portion 4Lb may have different basis weights, and each may have a substantially uniform basis weight. In that case, the basis weight of the rear low basis weight portion 4Lb may be slightly smaller than that of the front low basis weight portion 4Lf.
  • FIG. 5 shows an enlarged view of the area including the low basis weight portion 4L in FIG. 4.
  • the rear low basis weight portion 4Lb is surrounded on both sides and rear by a medium basis weight portion 4M.
  • the rear low basis weight portion 4Lb is easier to bend than the surrounding area, and can be easily raised toward the top sheet 3 side when force is applied from the outside in the lateral direction D2.
  • a middle basis weight part 4M having a higher basis weight is disposed behind the rear low basis weight part 4Lb.
  • the rearward extension range of the rear low basis weight portion 4Lb is to the front of the rear end of the absorbent core 4, preferably to the vicinity of the boundary between the intergluteal cleft facing region B1 and the rear buttock facing region B2. Therefore, the mountain formed by the rear low basis weight portion 4Lb is prevented from continuing to the rear end of the absorbent core 4, for example. Therefore, the rear buttock facing region B2 can be easily fitted to a region where the wearer's intergluteal cleft is shallow, or to a relatively flat region further back from the end position of the intergluteal cleft.
  • both sides and the rear of the rear low basis weight part 4Lb are medium weight parts 4M
  • the sides of the intergluteal cleft facing area B1 in the lateral direction D2 have slightly higher rigidity than the center of the lateral direction D2, so that deformation does not occur. Unnecessary wrinkles and wrinkles are less likely to occur even at times. Therefore, it becomes easy to align the middle portion 4M of the intergluteal cleft facing region B1 along the surface of the buttock on the side of the intergluteal cleft.
  • the absorbent article 1 when folding the absorbent article 1 when individually packaged, even if the fold line is located in the center part 4M, the absorbent article 1 is less prone to folding, and can be quickly unfolded to fit along the underwear during the wearing operation.
  • the length of the front low basis weight portion 4Lf in the longitudinal direction D1 is 40 to 120% of the lateral length of the absorbent body, and can be flexibly deformed over a wide range. Therefore, for example, even if the wearer makes a large movement such as opening and closing the legs or moving them back and forth, the absorbent article main body 8 can be deformed to follow the change in the shape of the body part in the crotch, thereby preventing leakage. Can be effectively prevented. In particular, if the bulge of the rear low basis weight portion 4Lb described above is allowed to penetrate relatively deeply into the intergluteal cleft, the intergluteal cleft opposing area B1 of the main body becomes difficult to move.
  • the region M facing the perineum may also become difficult to deform.
  • the front low basis weight part 4Lf extending in the lateral direction D2 can be flexibly deformed as described above, the front low basis weight part 4Lf can be , it can follow the deformation of the body part in front of the gluteal cleft.
  • a high fit can be obtained over a wide range along the front-back direction of the body, particularly from the perineum to the rear of the intergluteal cleft, and the fit can be maintained even during movement.
  • FIG. 6 schematically shows a cross-sectional view of the absorbent article 1 taken along the horizontal direction D2 when it is worn.
  • FIG. 6(a) is a schematic cross-sectional view of the absorbent article 1 taken at the perineum facing region M
  • FIG. 6(b) is a schematic cross-sectional view of the absorbent article 1 taken at the intergluteal cleft facing region B1.
  • FIG. 6(c) is a schematic cross-sectional view of the absorbent article 1 taken at the rear buttock facing region B2.
  • the perineum opposing region M faces the perineum at the crotch between the legs Lg.
  • the perineum facing area M includes the highly flexible front low basis weight part 4Lf, so the perineum facing area M It can closely follow the shadow and nearby body parts.
  • the rear low basis weight part 4Lb since the rear low basis weight part 4Lb is included in the intergluteal cleft opposing region B1, the rear low basis weight part 4Lb swells to form a mountain, and the crack of the buttocks Den ( It can be inserted into the gluteal cleft and attached tightly.
  • FIG. 6(b) since the rear low basis weight part 4Lb is included in the intergluteal cleft opposing region B1, the rear low basis weight part 4Lb swells to form a mountain, and the crack of the buttocks Den ( It can be inserted into the gluteal cleft and attached tightly.
  • the rear buttock-facing region B2 includes a middle-weight portion 4M that extends over the entire lateral direction D2, so that body parts where the intergluteal cleft is shallow or where there is no intergluteal cleft are included. It can be placed in close contact with a relatively flat surface. That is, according to the present embodiment, an absorbent article is provided that can be deformed to fit the shape of each region on the front and back of the body.
  • the length x f of the front low basis weight portion 4Lf in the lateral direction D2 may be preferably 30 to 110 mm, more preferably 60 to 100 mm. Further, from the viewpoint of improving the flexibility of the main body 8 in the lateral direction D2, the length x f of the front low basis weight portion 4Lf in the lateral direction D2 is preferably 70% or more of the length in the lateral direction D2 of the absorber 4. may be 80% or more, and is more preferably equal to the length of the absorbent body 4 in the lateral direction D2.
  • the length y f in the longitudinal direction D1 may preferably be 55 to 80 mm, more preferably 60 to 70 mm.
  • the length y f in the longitudinal direction D1 is 40 to 120% of the length in the lateral direction D2 of the absorbent body 4, but may be more preferably 50 to 110%, still more preferably 60 to 100%. .
  • the above length yf allows the region facing the perineum to be covered by the low basis weight portion, and ensures flexibility to follow movements such as opening and closing of the legs.
  • the length x b in the lateral direction D2 of the rear low basis weight portion 4Lb may be preferably 5 to 30 mm, more preferably 10 to 20 mm. Further, the lateral direction D2 length x b of the rear low basis weight portion 4Lb may be 5 to 25% of the lateral direction D2 length (width) of the absorbent body 4. The above length xb allows the above-mentioned mountain formed by the swell of the rear low basis weight portion 4Lb to be made into an appropriate size for entering into the intergluteal cleft and coming into close contact with it. Further, the length yb in the longitudinal direction D1 of the rear low basis weight portion 4Lb may be preferably 40 to 80 mm, more preferably 50 to 70 mm.
  • the above-mentioned mountain formed at the time of wearing is formed at an appropriate length corresponding to the intergluteal cleft, and continues to an area corresponding to a shallow intergluteal cleft or an area without an intergluteal cleft. can be suppressed.
  • the value of the ratio (y b /x b ) of the length y b in the longitudinal direction D1 of the rear low basis weight portion 4Lb to the length x b in the lateral direction may be 2 to 8.
  • the above-mentioned mountain formed by the swell of the rear low basis weight portion 4Lb can be made to have an appropriate size for entering and adhering to the intergluteal cleft.
  • a slit (a linear or strip-shaped gap passing through the thickness direction) in the absorber 4 instead of the low basis weight part 4L, but the low basis weight part 4L , unlike slits, it is possible to ensure the presence of an absorbent body, which is preferable because the absorption and retention of body fluids is enhanced.
  • the front low basis weight part 4Lf and the rear low basis weight part 4Lb are continuous as shown in FIG. It is preferable to do so.
  • the front low basis weight part 4Lf and the rear low basis weight part 4Lb do not need to be continuous as long as they do not impede the above-mentioned effects of both parts.
  • the front low basis weight part 4Lf and the rear low basis weight part 4Lb An inner fabric weight portion 4M may be arranged between the two.
  • the high basis weight portion 4H is formed at the center in the lateral direction D2 in the region C facing the body fluid outlet. This is the part that comes into contact with the body fluid outlet (vaginal opening, etc.).
  • the high basis weight portion 4H is surrounded by the front medium basis weight portion 4Mf, but may be in contact with the front low basis weight portion 4Lf located at the rear.
  • the high basis weight portion 4H may have a greater thickness than the surrounding front medium basis weight portion 4Mf.
  • FIG. 7 shows a modification of the low basis weight portion 4L.
  • the plan view shape of the front low basis weight portion 4Lf is a rectangle with long sides in the lateral direction D2
  • the plan view shape of the rear low basis weight portion 4Lb is a rectangle with long sides in the longitudinal direction D1. It is a rectangle with .
  • the front of the rear low basis weight part 4Lb gradually becomes wider toward the front, and at the position where it connects with the front low basis weight part 4Lf, the front low basis weight part 4Lf becomes wider. It has a length in the lateral direction D2 equal to the length in the lateral direction D2. In such a shape, the front part of the above-mentioned mountain formed by the bulge of the rear low basis weight part 4Lb becomes wide, making it easier to fit around the starting position of the intergluteal cleft.
  • the front of the rear low basis weight portion 4Lb gradually becomes wider toward the front, and the same advantage can be obtained.
  • the contour line is a gentle curve near the boundary between the front low basis weight part 4Lf and the rear low basis weight part 4Lb.
  • the front contour line of the front low basis weight portion 4Lf also has a gentle curve at the end in the lateral direction D2. Having a curved portion can reduce stress that may occur due to differences in basis weight.
  • the main body 8 of the absorbent article 1 of this embodiment has compressed grooves (also referred to as fit embossing) formed by compressing at least the top sheet 3 and the absorbent core 4 from the top sheet 3 side. It is formed. Since the compression groove has the function of drawing in and retaining body fluid, it can contribute to preventing the diffusion of body fluid or guiding the body fluid.
  • the compressed groove may include a plurality of compressed grooves (indicated by reference numerals 10, 11, 12, and 13). The compressed grooves may be formed symmetrically with respect to the longitudinal center line CL of the absorbent article 1 in plan view, but do not necessarily have to be symmetrically formed.
  • the compressed grooves can be formed, for example, by passing a laminate in which at least the top sheet 3 and the absorbent core 4 are laminated between a pair of pressure rolls. In that case, a roll having a convex portion corresponding to the compressed grooves on the surface is placed on the top sheet 3 side of the laminate, and a roll without unevenness on the surface is placed on the absorbent body 4 side. Pressure can be applied by sandwiching it between rolls.
  • the compression groove may include a low compression section and a high compression section that is compressed at a higher pressure within the low compression section. In the drawings, the high compression area is shown in black.
  • a pair of central compression grooves 10, 10 extend along the longitudinal direction D1, mainly from the region C facing the body fluid outlet to the region M facing the perineum.
  • the pair of central compressed grooves 10, 10 are arranged on both sides of the longitudinal center line CL, spaced apart from each other, and so as not to overlap with the high basis weight portion 4H.
  • the distance between the pair of central compressed grooves 10, 10 in the lateral direction D2 may be constant or may vary. For example, as shown in FIG. 1, it may become smaller near the boundary between the body fluid outlet facing region C and the perineum facing region M, become larger again behind it, and become smaller toward the rear end.
  • the pair of central compression grooves 10, 10 have the function of preventing leakage to the outside in the lateral direction D2 in the region C facing the body fluid outlet and guiding the body fluid in the longitudinal direction D1. Further, it is also possible to promote deformation in which the center of the body fluid outlet facing region C in the lateral direction D2 is raised toward the skin side.
  • a first rear compressed groove 11 is formed at the rear of the pair of central compressed grooves 10, 10 and spaced apart from the pair of central compressed grooves 10, 10.
  • the first rear compression groove 11 is formed in the buttock facing region B, mainly in the intergluteal cleft facing region B1.
  • the first rear compressed groove 11 is formed across the longitudinal center line CL, and has a generally rearwardly convex shape. More specifically, the first rear compressed groove 11 includes a horseshoe-shaped compressed groove 11h having a horseshoe shape (or a shape in which the ends are brought close to each other in a U-shape) overlapping the longitudinal center line CL, and the horseshoe-shaped compressed groove 11h. It may have a shape including side compression grooves 11s, 11s branching from the sides and extending forward.
  • a second rear compression groove 12 may be formed behind the first rear compression groove 11 and spaced apart from the first rear compression groove 11 .
  • the second rear compression groove 12 is a groove extending along the lateral direction D2, and has a rearwardly convex shape.
  • a front pressing groove 13 is formed in front of the pair of central pressing grooves 10, 10.
  • the front compressed groove 13 has a closed shape formed by combining compressed grooves that are convexly curved forward with different radii of curvature.
  • the pair of central compressed grooves 10, 10 (in FIG. 4, the arrangement is indicated by dotted lines) extends to the front low basis weight portion 4Lf, and further extends to the rear end of the front low basis weight portion 4Lf. extends beyond. That is, the rear ends 10bt, 10bt of the pair of central compressed grooves 10, 10 are located in the middle basis weight part 4M, which has a higher basis weight than the low basis weight part 4L, where the central press grooves 10, 10 are mainly arranged. .
  • the applied compression force is weaker than in other areas, so sufficient compression may not occur and the compression grooves may not be formed properly. . If the compression at the tip of the compression groove is insufficient, peeling (lifting) may occur in the portion that was compressed and joined in the thickness direction, and the compression groove may not be able to perform its function.
  • the rear ends 10bt, 10bt of the central compressed grooves 10, 10 extend backward beyond the rear end of the front low basis weight part 4Lf and into the rear middle basis weight part 4Mb. If so, the compressed grooves can be formed more reliably, and floating at the ends of the central compressed grooves 10, 10 can be prevented.
  • the rear ends 10bt and 10bt of the pair of central compression grooves 10 and 10 are formed from the perineum facing region M to the intergluteal cleft facing region B1, and when worn, the shape of the body changes from the perineum to the intergluteal cleft. is opposite the part. Therefore, force is easily applied to the rear ends 10bt, 10bt of the pair of central compressed grooves 10, 10, and lifting is likely to occur. From such a viewpoint, it is preferable that the rear ends 10bt, 10bt of the pair of central compressed grooves 10, 10 are located in the rear middle basis weight portion 4Mb.
  • rear ends 10bt, 10bt of the pair of central compression grooves 10, 10 may partially overlap the rear low basis weight portion 4Lb, but from the viewpoint of preventing the compression grooves from floating, 4Lb (FIG. 5), or even if it overlaps, it is preferable that it only partially overlap.
  • FIG. 8 shows an absorber 4' according to a modified example.
  • FIG. 8 is a diagram corresponding to FIG. 4, and is a diagram of the absorbent article 1 with the top sheet 3 and side sheets 7, 7 removed.
  • the absorber 4' has a low basis weight part 4L, a middle basis weight part 4M, and a high basis weight part 4H, as in the example shown in FIG.
  • a fabric weight changing portion 4V is formed between the portion 4Lf and the rear middle fabric weight portion 4Mb.
  • the basis weight changing portion 4V is located between the rear end of the front low basis weight portion 4Lf and the front end of the rear medium basis weight portion 4Mb, so that the rear low basis weight portion 4Lb is different from the basis weight changing portion 4V and the rear low basis weight portion 4Lf. It is sandwiched between the portions 4Lb in the lateral direction D2.
  • the basis weight changing portion 4V has a basis weight that is higher than the basis weight of the low basis weight portion 4L and lower than the basis weight of the medium basis weight portion 4M.
  • the fabric weight of the fabric weight changing portion 4V increases gradually or stepwise from the front to the rear, that is, as it approaches the rear middle fabric weight portion 4Mb.
  • the basis weight changing portion 4V By forming the basis weight changing portion 4V, a sudden change in the basis weight in the longitudinal direction D1 can be avoided.
  • the difference between the basis weight of the front low basis weight part 4Lf and the basis weight of the rear medium basis weight part 4Mb is large, unnecessary stress is generated at the boundary between the front low basis weight part 4Lf and the rear medium basis weight part 4Mb, and the desired deformation of the main body 8 is prevented.
  • such inconveniences can be prevented.
  • the total length of the boundary line between the front low basis weight portion 4Lf and the rear medium basis weight portion 4Mb is relatively long, and in some cases, the total length of the boundary line between the front low basis weight portion 4Lf and the rear medium basis weight portion 4Mb is relatively long, and in some cases, Since it is 75 to 95% of the length of D2, the above disadvantage is likely to be emphasized. Therefore, especially when the difference between the fabric weight of the front low fabric weight part 4Lf and the fabric weight of the rear medium fabric weight part 4Mb is large, it is preferable to provide the fabric weight changing part 4V between them.
  • FIG. 9 shows an enlarged view of the area including the low basis weight portion 4L in FIG. 8.
  • the basis weight changing portion 4V is constituted by a first portion 4V 1 and a second portion 4V 2 , which have two different basis weights.
  • the basis weight changing portion 4V may be a portion with different basis weights in three or four stages, or may be a portion where the basis weight changes gradually as described above.
  • the basis weight of the first part 4V 1 which is located adjacent to the front low basis weight part 4Lf, is adjacent to the rear middle basis weight part 4Mb. It is lower than the basis weight of the second part 4V2 , which is arranged as follows.
  • the length y v in the longitudinal direction D1 of the basis weight changing portion 4V may be 2 to 15 mm, and may be 5 to 20% of the length y b in the longitudinal direction D1 of the rear low basis weight portion 4Lb.
  • the pair of central compressed grooves 10, 10 also extend over the basis weight changing portion 4V. Furthermore, it is preferable that the pair of central compressed grooves 10, 10 extend beyond the rear end of the basis weight changing portion 4V to the rear middle basis weight portion 4Mb. That is, the central compressed grooves 10, 10 extend in the longitudinal direction D1 so as to straddle the basis weight changing portion 4V, and the rear ends 10bt, 10bt of the central compressed grooves 10, 10 are disposed within the rear middle basis weight portion 4Mb. is preferred. Thereby, the portions near the rear ends of the central compressed grooves 10, 10 are arranged in a region where the basis weight changes gradually or stepwise from the low basis weight portion 4L to the medium basis weight portion 4M.
  • a compressed portion can be formed more reliably by compressing in a region with a high basis weight, the portions near the rear ends of the central compressed grooves 10, 10 are gradually compressed toward the tips (rear ends) 10bt, 10bt.
  • it is compressed in stages, that is, gradually more reliably and deeply, and it is possible to prevent peeling (floating) near the rear end and also to prevent discomfort when touching the compression grooves.
  • FIG. 10 schematically shows a manufacturing apparatus 60 for manufacturing the absorbent body 4.
  • the absorbent material 4 is obtained by supplying an absorbent material to become an absorbent body, stacking the fibers in an absorbent mold having a plurality of suction holes on the bottom, and removing the mold.
  • a pulp supply section 61 is provided upstream of the manufacturing device 60 to supply a fiber material mainly containing pulp.
  • the pulp supply section 61 may be equipped with a defibrator, which defibrates the pulp sheet and supplies it into the duct 62 .
  • a polymer particle introducing section 63 for supplying super absorbent polymer particles may be provided in the middle of the duct 62. Therefore, the pulp and superabsorbent polymer particles are mixed in the duct 62, and the resulting absorbent material is supplied to the stacking drum 65.
  • a plurality of absorbent molds 50 are arranged on the outer circumferential surface of the fiber stacking drum 65 and spaced apart from each other in the circumferential direction.
  • the absorbent bodies 50, 50, . . . can sequentially receive the absorbent material.
  • the bottom surface of the absorbent body 50 is composed of a porous plate or a mesh plate, and absorbent material can be accumulated on the bottom surface of the absorbent body 50 by sucking gas through the openings. Further, by discharging gas through the openings, the absorbent body 4 can be supplied to a conveying means 66 such as a belt conveyor.
  • a negative pressure chamber and a positive pressure chamber are provided inside the stacking drum 65, and each chamber allows suction and discharge of gas, respectively.
  • a scuffing roll (or brush) 64 may be provided at a downstream position within the duct 62.
  • the scuffing roll 64 can scrape off excess stacked absorbent material and make the surface of the absorbent material accumulated on the absorbent body 50 uniform.
  • the absorbent body 4 supplied to the conveyance means 66 can be compressed in the thickness direction by the compression means 67.
  • the compression means 67 may be a pair of rolls as shown in FIG. 10, or a pair of pressing members approaching from both sides of the absorbent body 4.
  • the compression means 67 enhances the shape retention of the absorbent body 4.
  • FIG. 11 shows a plan view of an example of the absorbent type 50 provided on the fiber stacking drum 65.
  • FIG. 12(a) shows an enlarged view of the portion P1 in FIG. 11, and
  • FIG. 12(b) shows an enlarged view of the portion P2 in FIG. 11.
  • FIG. 13(a) shows a Y1-Y1 cross section in FIG. 11, and
  • FIG. 13(b) shows a Y2-Y2 cross section in FIG.
  • the absorbent mold 50 shown in FIGS. 11-13 is the mold used to manufacture the above-described absorbent body 4 (FIGS. 1-5).
  • the longitudinal direction of the absorbent body 50 corresponds to the longitudinal direction D1 of the absorbent body 4 to be obtained, and the lateral direction of the absorbent body 50 corresponds to the lateral direction D2 of the absorbent body 4.
  • the longitudinal and lateral directions of the body 50 are also designated by D1 and D2, respectively.
  • the absorbent body 50 has an overall concave shape so that absorbent material can be collected therein.
  • the bottom surface of the absorbent type 50 is a porous plate, that is, the bottom surface of the absorbent type 50 is formed with a large number of openings 55, 55, . . . (FIG. 12).
  • the shape of the apertures is not uniform throughout the absorbent body 50, and the aperture area ratio, that is, the ratio of the total area of the apertures per unit area of the bottom surface, differs depending on the location.
  • the bottom surface of the absorbent body 50 has a low-accumulation zone ZL with a low area ratio of pores, and a front middle area with an opening area ratio higher than the area ratio of the pores in the low-accumulation zone ZL . It has an accumulation zone ZMf and a rear middle accumulation zone ZMb (which may be collectively referred to as the middle accumulation zone ZM ).
  • the open area ratio and structure of the front medium accumulation zone Z Mf and the rear medium accumulation zone Z Mb may be the same or different, but if they are the same, it will be complicated when manufacturing the absorbent type 50. This is preferable because it reduces the noise.
  • the bottom surface of the absorbent body 50 may be formed from a mesh plate formed by combining wires.
  • the low accumulation zone Z L , the front medium accumulation zone Z Mf , and the rear medium accumulation zone Z Mb are the front low basis weight part 4Lf, the front medium basis weight part 4Mf, and the rear part of the obtained absorbent body 4 (FIG. 4, etc.), respectively.
  • This zone corresponds to the middle basis weight portion 4Mb.
  • a recess 51 is formed in the front middle accumulation zone Z Mf (FIG. 13), and this recess 51 corresponds to the high basis weight portion 4H of the absorbent body 4 (FIG. 4, etc.).
  • the open area ratio of the bottom surface of the recess 51 may be the same as or different from the open area ratio of the surrounding area.
  • the amount of absorbent material accumulated in the recess 51 can be further increased.
  • This configuration is suitable when it is desired to further increase the basis weight of the high basis weight portion 4H and to increase the difference in basis weight between the high basis weight portion 4H and the front intermediate basis weight portion 4Mf.
  • a non-porous convex member 52 is provided in the rear middle accumulation zone Z Mb , and this non-porous convex member 52 corresponds to the rear low basis weight portion 4Lb of the absorbent body 4.
  • This non-porous convex member 52 may be provided by placing a member formed separately from the absorbent body 50 in the rear middle accumulation zone ZMb , or when molding the absorbent body 50, The bottom surface of the absorbent body 50 may be formed so that a non-porous convex portion is formed in the rear middle accumulation zone Z Mb .
  • the shape of one opening 55 on the bottom surface of the absorbent type 50 is square in plan view.
  • the shape of the opening 55 is not limited to that shown in the drawings, and may be a quadrilateral other than a square, a polygon other than a quadrangle, a circle, an ellipse, or the like.
  • the shape and area of one opening 55 in the front medium accumulation zone Z Mf are the same as the shape and area of one opening 55 in the low accumulation zone Z L. (FIGS. 12(a) and (b)).
  • the difference in the aperture area ratio between the low accumulation zone Z L and the front medium accumulation zone Z Mf is the difference in the density or degree of density of the apertures 55 .
  • the opening area ratio of the medium accumulation zone ZM is larger than the opening area ratio of the low accumulation zone ZL , the shape and area of the openings 55 formed on the bottom of the medium accumulation zone ZM , the shape and area of the opening 55 formed on the bottom surface of the low accumulation zone ZL may be different.
  • the open pore area ratio of the middle accumulation zone Z M (the front middle accumulation zone Z Mf and the rear middle accumulation zone Z Mb ) may be 25 to 50%. Further, the open pore area ratio of the low accumulation zone ZL may be 5 to 20%.
  • the open pore area ratio of the bottom surface in the low accumulation zone ZL which is a region corresponding to the front low basis weight section 4Lf of the absorbent body 4 (see FIG. 4, etc.), corresponds to the middle basis weight section 4M. It is smaller than the open pore area ratio of the bottom surface in the medium accumulation zone ZM , which is the area where the pores are formed.
  • the low basis weight of the front low basis weight portion 4Lf is achieved by reducing the opening area ratio on the bottom surface.
  • the bottom surface level (height of the bottom surface) is varied by partially forming unevenness on the bottom surface of the absorbent body, etc.
  • Another option is to reduce the thickness of the absorbent material.
  • the absorbent material will It becomes easy to be separated at the edges. Therefore, in the manufacturing process of the absorbent body 4, for example, in the step of scraping the material using the scuffing roll 64, the absorbent body tends to become discontinuous at the step, and the absorbent body 4 may be torn into pieces, or the absorbent body 4 may be The desired thickness may not be obtained.
  • the front low basis weight portion 4Lf see FIGS.
  • the non-hole convex member 52 is provided in the region corresponding to the rear low basis weight portion 4Lb (FIGS. 11 and 13).
  • the thickness of the absorbent material that is accumulated becomes thinner by the corresponding thickness, so that the basis weight can be reliably lowered.
  • the low basis weight of the rear low basis weight portion 4Lb is obtained by changing the bottom surface level (height of the bottom surface), unlike the above-mentioned front low basis weight portion 4Lf.
  • the non-hole convex member 52 should be used as described above instead of reducing the area ratio of the openings. is preferred.
  • Reasons for this include the following. If two areas with different open area ratios are adjacent, the boundary between the two areas will not be so clear because fibrous materials such as pulp will accumulate across the boundary during fiber stacking. .
  • the rear low basis weight portion 4Lb and the area corresponding to the rear low basis weight portion 4Lb The boundary with the rear medium basis weight portion 4Mb that surrounds the rear medium basis weight portion 4Mb becomes ambiguous, and there is a possibility that the area of the narrow rear low basis weight portion 4Lb cannot be secured.
  • the thickness of the absorbent material to be accumulated can be reduced and the amount of accumulation can be reliably reduced, so a low basis weight area can be more reliably secured.
  • the front low basis weight part and the rear low basis weight part are formed by different means depending on the shape (particularly the length in the lateral direction D2) of each low basis weight part. Therefore, the area of the low basis weight portion can be reliably secured without any problems such as the absorber being torn to pieces.
  • FIG. 14 to 16 show an absorbent type 50' according to a modified example.
  • FIG. 14 is a plan view of the absorbent type 50', and corresponds to FIG. 11.
  • FIG. 15 shows an enlarged view of portion P3 in FIG. 14.
  • FIG. 16(a) shows a Y1'-Y1' cross section in FIG. 14, and
  • FIG. 16(b) shows a Y2'-Y2' cross section in FIG.
  • the absorbent body type 50' shown in FIGS. 14 to 16 is the type used to manufacture the modified example of the absorbent body 4' described above (FIGS. 8 and 9).
  • the basic structure of the absorbent type 50' is similar to the absorbent type 50 shown in FIGS. 11 to 13.
  • the absorbent body 50' has a concave shape as a whole so that absorbent material can be collected therein, and the bottom surface of the absorbent body 50' is also formed from a porous plate.
  • the bottom surface of the absorbent type 50' has a low accumulation zone ZL with a low open pore area ratio and a higher open pore area rate than the low accumulation zone ZL of the pores. It has a front medium accumulation zone Z Mf and a rear medium accumulation zone Z Mb (medium accumulation zone Z M ) having an area ratio.
  • variable accumulation zone ZV is provided between the low accumulation zone ZL and the rear medium accumulation zone ZMb .
  • the change accumulation zone ZV is an area corresponding to the above-mentioned area weight change portion 4V.
  • the variable accumulation zone ZV has a higher open pore area ratio than the low accumulation zone ZL , and has a lower open pore area ratio than the rear medium accumulation zone ZMb , and further toward the rear, that is, the low accumulation zone ZL This is a zone in which the open pore area ratio gradually or stepwise increases from the rear middle accumulation zone Z Mb .
  • FIG. 15 is an enlarged view of portion P3 in FIG. 14, that is, a portion spanning the low accumulation zone Z L , the variable accumulation zone Z V , and the rear medium accumulation zone Z Mb .
  • the variable accumulation zone ZV includes a first zone ZV1 adjacent to the low accumulation zone ZL and a second zone ZV2 adjacent to the rear medium accumulation zone ZMb .
  • the open pore area ratio in the first zone Z V1 is smaller than the open pore area ratio in the second zone Z V2 .
  • the first zone Z V1 corresponds to the first part 4V 1 (Fig. 9, etc.) of the above-mentioned absorber 4'
  • the second zone Z V2 corresponds to the second part 4V 2 (Fig. 9, etc.).
  • the variable accumulation zone ZV is formed such that the open pore area ratio changes in two stages, a first zone ZV1 and a second zone ZV2 , along the longitudinal direction of the absorbent body 50'.
  • the open pore area ratio in the change accumulation zone ZV may be changed in three or more steps, or may be changed gradually along the longitudinal direction D1.
  • a variable accumulation zone ZV in which the open pore area ratio changes in the longitudinal direction is provided between the low accumulation zone ZL and the rear medium accumulation zone ZMb . Since it is possible to gradually change the amount of absorbent material accumulated from the low accumulation zone ZL to the rear medium accumulation zone ZMb , it is possible to prevent the basis weight from rapidly changing in the middle of the absorber, and to improve the front low basis weight.
  • the continuity between the portion 4Lf and the rear middle basis weight portion 4Mb is increased. Therefore, when there is a large difference in the basis weight between the front low basis weight part 4Lf and the rear medium basis weight part 4Mb, it is possible to prevent the occurrence of discontinuous portions of the absorbent body.
  • one embodiment of the present invention may be a method of manufacturing an absorbent article using an absorbent body manufactured by the above-described manufacturing method.
  • FIG. 17 shows a state in which the absorbent article 1 shown in FIG. 1 is placed on a packaging sheet 20.
  • FIG. 18 schematically shows a cross section taken along line III-III in FIG. 17.
  • FIG. 19 shows a state in which the absorbent article 1 and the packaging sheet 20 are folded from the state shown in FIG. 18 to form an individually packaged absorbent article 100.
  • the absorbent article 1 and packaging sheet 20 are folded along three fold lines (FL1, FL2, and FL3) extending along the lateral direction D2. In other words, fold it into quarters.
  • FL1, FL2, and FL3 fold lines extending along the lateral direction D2. In other words, fold it into quarters.
  • the rear portion is folded back at the second fold line FL2 passing through the facing area M.
  • the front portion is folded back at the first fold line FL1 near the boundary between the front region F and the body fluid outlet facing region C.
  • the fastening tape 22 is placed after the absorbent article 1 is folded and packaged together with the packaging sheet 20, it is also shown in FIGS.
  • the schematic diagrams in FIGS. 18 and 19 also show the positions of the front medium basis weight portion 4Mf, the high basis weight portion 4H, the front low basis weight portion 4Lf, the rear low basis weight portion 4Lb, and the rear medium basis weight portion 4Mb.
  • the height of the fabric weight is not necessarily reflected in the thickness depending on the process after manufacturing the absorber, in the schematic diagrams of FIGS. 18 and 19, the fabric weight is reflected in the thickness.
  • the folding line is provided at a position avoiding the high basis weight portion 4H, which facilitates the folding process.
  • the second folding line FL2 passes through the front low basis weight portion 4Lf, and the third folding line FL3 passes near the rear end of the rear low basis weight portion 4Lb, preferably through the rear low basis weight portion 4Lb. This further improves the ease of folding.
  • the fastening tape 22 overlaps the front low basis weight part 4Lf instead of the area including the rear low basis weight part 4Lb and the rear medium basis weight part 4Mb. That's what I do. Since the rear low basis weight portion 4Lb may become a depression at the center in the lateral direction D2, the fastening tape 22 similarly arranged at the center in the lateral direction D2 may be difficult to stick to. On the other hand, according to this embodiment, the fastening tape 22 is made not to overlap the rear low basis weight part 4Lb, but to overlap the front low basis weight part 4Lf having a uniform basis weight across the lateral direction D2, The fastening tape 22 can be attached more reliably.
  • An embodiment according to Supplementary Note 1 is an elongated absorbent article comprising a skin-side top sheet, a non-skin side back sheet, and an absorbent body disposed between the top sheet and the back sheet,
  • the absorbent body has a middle basis weight part and a low basis weight part adjacent to the middle basis weight part and having a lower basis weight than the middle basis weight part, and the low basis weight part has a front low basis weight part and a front low basis weight part.
  • a rear low basis weight portion having a width shorter than that of the absorbent body, and the longitudinal length of the front low basis weight portion is 40 to 120% of the lateral length of the absorbent body.
  • the rear low basis weight portion located at the rear and having a short lateral length can easily bulge toward the top sheet side during installation. This bulge allows you to form a peak that is sized to fit into the narrow area of the intergluteal cleft. This improves the fit to the intergluteal cleft and prevents leakage at the intergluteal cleft, for example, when bodily fluids migrate backwards from the bodily fluid outlet through the intergluteal cleft (also referred to as leakage).
  • a front low basis weight portion having a predetermined length in the longitudinal direction is formed. Therefore, the front portion within the low basis weight portion can be flexibly deformed over a wide range. Therefore, for example, even when the wearer opens and closes their legs or moves them back and forth, the absorbent article main body deforms to follow the change in the shape of the crotch region in front of the gluteal cleft. I can do it.
  • the absorbent article main body deforms to follow the change in the shape of the crotch region in front of the gluteal cleft. I can do it.
  • the area of the body facing the intergluteal cleft will be difficult to move and deform. It may become difficult to deform.
  • the front low basis weight part is formed in front of the rear low basis weight part, which enables flexible deformation over a wide range, so that the absorbent article body can be deeply fitted into the intergluteal cleft. It also provides an excellent fit for body parts in front of the gluteal cleft. As described above, according to this aspect, a high fit can be obtained over a wide range along the front-back direction of the body, particularly from the perineum to the rear of the intergluteal cleft, and the fit can be maintained even during movement.
  • the lateral length of the front low basis weight portion is equal to the lateral length of the absorbent body.
  • the lateral length of the rear low basis weight portion is 5 to 25% of the lateral length of the absorbent body.
  • the width of the above-mentioned mountain formed by the rear low basis weight portion can be set to an appropriate size to correspond to the deep part of the intergluteal cleft.
  • the intermediate basis weight portion includes a front intermediate basis weight portion adjacent to the front of the front low basis weight portion, and adjacent to the rear of the front low basis weight portion and on both sides and rear of the rear low basis weight portion.
  • a compression groove is formed in at least the top sheet and the absorbent body, and the compression groove is recessed from the top sheet side to the back sheet side, and the compression groove is configured to allow the wearer to a pair of central compression grooves extending along the longitudinal direction of a region facing the body fluid discharge port, the pair of central compression grooves extending rearwardly beyond the rear end of the front low basis weight portion; Extending.
  • the compressed force applied is weaker than in other regions, so it may not be possible to reliably form the compressed grooves. If the compression at the tip of the compression groove is insufficient, the compressed and joined part in the thickness direction may peel off (so-called floating occurs), and the compression groove may not be able to perform its function.
  • the pair of central compressed grooves extends rearward beyond the rear end of the front low basis weight portion, that is, the rear end of the pair of central compressed grooves extends rearward of the front low basis weight portion. Since it extends into the rear middle area adjacent to the center area, floating at the end of the central pressing groove can be prevented, and the pressing groove can function properly.
  • a basis weight changing part is formed between the front low basis weight part and the rear middle basis weight part, and the basis weight in the basis weight changing part is higher than the basis weight of the front low basis weight part, and the basis weight changing part is higher than the basis weight of the front low basis weight part, and It is lower than the basis weight of the rear middle basis weight part, and increases gradually or stepwise toward the rear.
  • the basis weight changing portion can avoid a sudden change in the basis weight in the longitudinal direction, so that unnecessary stress is not generated in the region from the front low basis weight portion to the rear medium basis weight portion. It becomes possible to transform according to the shape of the body. Therefore, flexible deformation of the area from the area facing the perineum to the area facing the intergluteal cleft can be promoted.
  • the absorbent body further includes a body fluid outlet facing region that faces the body fluid outlet of the wearer when worn, and is surrounded by the front middle basis weight portion and has a basis weight lower than the front middle basis weight portion. It also has a high basis weight part with a high basis weight.
  • the presence of the high basis weight portion in the region facing the body fluid discharge port allows the absorbent article main body to be brought into close contact with the body fluid discharge port, thereby preventing leakage.
  • the absorbent body includes at least three regions having different basis weights (a low basis weight portion, a medium basis weight portion, and a high basis weight portion).
  • the aspect according to appendix 7 is a method for manufacturing an absorbent body for an absorbent article, wherein the absorbent body has a middle basis weight part and a low basis weight part adjacent to the middle basis weight part and having a lower basis weight than the middle basis weight part.
  • the low basis weight portion includes a front low basis weight portion and a rear low basis weight portion having a width shorter than the front low basis weight portion, and the longitudinal length of the front low basis weight portion is the same as that of the absorbent body.
  • the area ratio of the openings in the area corresponding to the front low basis weight part is smaller than the area rate of the openings in the area corresponding to the middle area, and the area corresponding to the rear low basis weight part is non-containing.
  • a hole convex member is provided.
  • an absorbent article having the same effects as the embodiment according to Supplementary Note 1 can be manufactured.
  • the area ratio of the openings on the bottom of the absorbent type in the area corresponding to the front low basis weight part is the area ratio of the openings on the bottom side in the area corresponding to the medium basis weight part. is smaller than the rate. That is, the difference in the basis weight between the front low basis weight part and the medium basis weight part is obtained by varying the area ratio of the openings on the bottom surface of the absorbent type.
  • the bottom surface level by partially forming a convex portion or a concave portion on the bottom surface of the absorbent body.
  • a difference in basis weight can be created relatively easily and reliably.
  • the absorbent material especially fibrous material such as pulp
  • the absorbent material may be separated at the edge of the step. It becomes easier. Therefore, in the process of stacking the absorbent material, scraping the material, demolding, etc., the absorbent material may be torn to pieces at the step, or the desired thickness of the absorbent material may not be obtained.
  • the front low basis weight part in this aspect is a low basis weight part with a relatively long lateral length (over a wide range in the lateral direction), the area ratio of the openings on the bottom surface is varied instead of making the bottom level different. By obtaining a low basis weight, it is possible to prevent problems such as tearing that may occur between the material and the medium basis weight.
  • a non-hole convex member is provided in the region corresponding to the rear low basis weight portion, and the low basis weight of the rear low basis weight portion is obtained by this non-hole convex member.
  • the layer of absorbent material accumulated on the non-porous convex member becomes thinner than the surrounding area by the thickness of the non-porous convex member after the scraping process after fiber stacking, thus ensuring a low basis weight. It will be done.
  • the absorbent material drawn in the areas on both sides of the narrow non-perforated convex member (areas corresponding to the middle area on both sides in the lateral direction) will overlap each other and the boundaries will become vague, resulting in a lower rear area with a lower area.
  • the front low basis weight part and the rear low basis weight part are formed by different means depending on the shape of each low basis weight part. Therefore, the area of the low basis weight portion can be reliably secured without any problems such as the absorber being torn to pieces.
  • the intermediate basis weight portion includes a front intermediate basis weight portion adjacent to the front of the front low basis weight portion, and adjacent to the rear of the front low basis weight portion and on both sides and rear of the rear low basis weight portion.
  • a rear medium basis weight portion adjacent to the rear medium basis weight portion
  • a basis weight changing portion is formed between the front low basis weight portion and the rear medium basis weight portion, and the area ratio of the opening in the area corresponding to the basis weight changing portion. is larger than the area ratio of the openings in the area facing the front low area weight part, smaller than the area ratio of the openings in the area corresponding to the rear medium area weight area, and gradually or stepwise becomes larger toward the rear. ing.
  • an absorbent article having the same effects as the embodiment according to Supplementary Note 5 can be manufactured.
  • the basis weight between the rear low basis weight part and the rear medium basis weight part by changing the basis weight between the rear low basis weight part and the rear medium basis weight part, the continuity in the longitudinal direction of the absorbent body is impaired by avoiding a sudden change in the basis weight between the two. Possibility can be reduced.
  • the absorbent body further includes a body fluid outlet facing area that faces the body fluid outlet of the wearer when worn, and is surrounded by the front middle fabric weight part and has a fabric weight lower than the front middle fabric weight part. It also has a high basis weight portion having a high basis weight, and a region corresponding to the high basis weight portion is a recessed portion formed in a region corresponding to the front middle basis weight portion.
  • an absorbent article having the same effects as the embodiment according to Supplementary Note 6 can be manufactured. Further, in the area within the front middle area, a high area with a higher basis weight can be formed. In that case, the opening area ratio on the bottom surface of the area facing the high basis weight part may be the same as the opening area ratio of the area corresponding to the front middle basis weight part, or the opening area ratio of the area corresponding to the front middle basis weight part. It can also be greater than the percentage.

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

L'invention concerne un article absorbant long et mince comprenant une feuille supérieure située sur le côté peau, une feuille arrière située sur le côté non-peau, et un adsorbant situé entre la feuille supérieure et la feuille arrière, l'adsorbant ayant une partie de poids par zone intermédiaire et une partie de poids par zone faible qui est située adjacente à la partie de poids par zone intermédiaire et ayant un poids par zone inférieur à celui de la partie de poids par zone intermédiaire, la partie de poids par zone faible comprenant une partie de poids par zone faible avant et une partie de poids par zone faible arrière ayant une largeur inférieure à celle de la partie de poids par zone faible avant, et la longueur dans la direction de la longueur de la partie de poids par zone faible avant étant de 40 à 120 % de la longueur dans la direction de la largeur de l'absorbeur.
PCT/JP2023/012774 2022-05-31 2023-03-29 Article absorbant et procédé de production d'absorbeur pour articles absorbants WO2023233785A1 (fr)

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JP2022088308A JP2023176164A (ja) 2022-05-31 2022-05-31 吸収性物品、及び吸収性物品用の吸収体の製造方法
JP2022-088308 2022-05-31

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WO2023233785A1 true WO2023233785A1 (fr) 2023-12-07

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63109859A (ja) * 1986-07-18 1988-05-14 ザ、プロクタ−、エンド、ギャンブル、カンパニ− 低い密度と低い坪量の獲得帯を有する高密度吸収性部材
JP2015059287A (ja) * 2013-09-20 2015-03-30 花王株式会社 積繊装置
JP2017012453A (ja) * 2015-06-30 2017-01-19 ユニ・チャーム株式会社 吸収性物品
JP2020096749A (ja) * 2018-12-19 2020-06-25 ユニ・チャーム株式会社 吸収性物品

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63109859A (ja) * 1986-07-18 1988-05-14 ザ、プロクタ−、エンド、ギャンブル、カンパニ− 低い密度と低い坪量の獲得帯を有する高密度吸収性部材
JP2015059287A (ja) * 2013-09-20 2015-03-30 花王株式会社 積繊装置
JP2017012453A (ja) * 2015-06-30 2017-01-19 ユニ・チャーム株式会社 吸収性物品
JP2020096749A (ja) * 2018-12-19 2020-06-25 ユニ・チャーム株式会社 吸収性物品

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JP2023176164A (ja) 2023-12-13

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