WO2018020775A1 - Article absorbant. - Google Patents

Article absorbant. Download PDF

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Publication number
WO2018020775A1
WO2018020775A1 PCT/JP2017/017811 JP2017017811W WO2018020775A1 WO 2018020775 A1 WO2018020775 A1 WO 2018020775A1 JP 2017017811 W JP2017017811 W JP 2017017811W WO 2018020775 A1 WO2018020775 A1 WO 2018020775A1
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WO
WIPO (PCT)
Prior art keywords
joint
sheet
cells
cell
weak
Prior art date
Application number
PCT/JP2017/017811
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English (en)
Japanese (ja)
Inventor
陽平 大野
Original Assignee
大王製紙株式会社
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Filing date
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Application filed by 大王製紙株式会社 filed Critical 大王製紙株式会社
Publication of WO2018020775A1 publication Critical patent/WO2018020775A1/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
    • 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
    • A61F13/539—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 characterised by the connection of the absorbent layers with each other or with the outer layers

Definitions

  • the present invention relates to absorbent articles such as disposable diapers and sanitary napkins.
  • the absorbent article includes an absorbent body and a liquid-permeable top sheet that covers the front side of the absorbent body, and excreted liquid such as urine and menstrual blood passes through the top sheet and is absorbed and held by the absorbent body. It has become so.
  • the absorbent body As the absorbent body, a mixture of highly absorbent polymer particles (SAP) mixed with hydrophilic short fibers such as pulverized pulp and piled up in a cotton form is widely adopted, while ensuring a sufficient absorbable amount, As a response to requests for further thinning, weight reduction, low cost, etc., a large number of cells (small chambers) surrounded by the joint portion of the front side sheet and the back side sheet and the front side sheet and the back side sheet are not joined, Various types of absorbers (hereinafter also referred to as cell absorbers) having high-absorbent polymer particles contained in the cells have been proposed (see, for example, Patent Documents 1 to 8 below).
  • SAP highly absorbent polymer particles
  • hydrophilic short fibers such as pulverized pulp and piled up in a cotton form
  • the main problem of the present invention is to improve the utilization of the cell absorber for absorption of a site far from the excretion position.
  • ⁇ First aspect> Included in this cell are a front side sheet, a back side sheet arranged on the back side, a large number of cells surrounded by a joint between the front side sheet and the back side sheet, and the front side sheet and the back side sheet are not joined.
  • an absorbent article comprising an absorbent body having a powder comprising superabsorbent polymer particles;
  • the joint includes a weak joint that can be peeled by the expansion force of the superabsorbent polymer particles in an adjacent cell, Cells that are adjacent via the weak junction can be merged by peeling off the weak junction, and can be expanded to a larger single cell,
  • the absorbent body In the absorption promotion region including the excretion position facing the wearer's excretion port and at least a part of the periphery, the absorbent body has only a weak joint in at least one direction from the excretion position facing the wearer's excretion port.
  • a plurality of adjacent areas of the cells are arranged through, and the area of the aggregate area is farther from the excretion position, and the joint strength of the weak joint is weakened.
  • ⁇ Second aspect> In the absorption promoting region, a plurality of adjacent cell gathering regions are arranged in the front-rear direction only through weak joints, and the joint strength of these gathering regions decreases toward the both sides in the front-rear direction from the excretion position. ing, The absorbent article of a 1st aspect.
  • ⁇ Third Aspect> In the absorption promotion region, a plurality of adjacent collection regions of cells are arranged in the radial direction centered on the excretion position via only weak joints, and these collective regions are directed outward in the radial direction centered on the excretion location. The weaker the joint strength is, The absorbent article of a 1st aspect.
  • the joint As the joint, the weak joint, and a strong joint that does not peel off due to the expansion force of the superabsorbent polymer particles in the adjacent cells,
  • the strong joint is provided at the boundary where the joint strength of the weak joint changes.
  • the gelled product of the superabsorbent polymer particles expanded at the time of absorption can move greatly in the combined cell, and the gelled product gathers in a low place such as the crotch. There is a risk of worsening the fit.
  • a strong joint is provided at the boundary where the joint strength of the weak joint changes as described above, the action due to the change in the joint strength of the weak joint does not hinder and does not peel at the time of absorption.
  • the strong joint can prevent the gelled product of the superabsorbent polymer particles from moving, and can prevent the shape of the absorber from collapsing.
  • ⁇ Fifth aspect> The region where the cells are adjacent to each other only through the weak junction is such that the region where the weak junction is weaker, the greater the number of cells included in the region.
  • the joint is provided along a pattern in which polygons are arranged without gaps,
  • the cell has a polygon surrounded by a polygonal portion of the joint.
  • the absorbent article according to any one of the first to fifth aspects.
  • the present invention is suitable for a form in which the joint and the cell have such a regular shape and arrangement.
  • the utilization degree for absorption of a site far from the excretion position can be improved.
  • FIG. 6 is a sectional view taken along line 6-6 in FIG.
  • FIG. 7 is a sectional view taken along line 7-7 in FIG. (A) 8-8 sectional view of FIG. 1, (b) 9-9 sectional view of FIG.
  • FIG. 5 is a sectional view taken along the line 5-5 in FIG. (A) The principal part fracture
  • FIG. 13 is a sectional view taken along the line 3-3 in FIGS. 9 to 12; It is a top view of the absorber which showed the joined part simply. It is a top view of the absorber which showed the joined part simply. It is a top view of the absorber which showed the joined part simply. It is a top view of the absorber which showed the joined part simply. It is a top view of the absorber which showed the joined part simply. It is a top view of the absorber which showed the joined part simply. It is a top view of the absorber which showed the joined part simply. It is a schematic plan view which shows the example of various arrangement
  • FIGS. 1 to 6 show an example of a tape-type disposable diaper.
  • symbol X indicates the full width of the diaper excluding the fastening tape
  • symbol L indicates the total length of the diaper.
  • Each component is fixed or bonded in the same manner as a known diaper, if necessary, other than the fixed or bonded portion described below.
  • a hot melt adhesive or welding heat welding, ultrasonic welding
  • This tape-type disposable diaper has a basic structure in which an absorbent body 50 is interposed between a liquid-permeable top sheet and a liquid-impermeable sheet located on the outer surface side.
  • Each of which has a ventral end flap portion EF and a dorsal end flap portion EF, which are portions extending to the side and not having the absorber 50, and extend laterally from the side edge of the absorber 50. It has a pair of side flap portions SF to be taken out.
  • Fastening tapes 13 are respectively provided on the side flap portions SF in the back portion B, and when attaching the diaper, the side flap portion SF of the back portion B is overlapped on the outside of the side flap portion SF of the ventral portion F. In this state, the fastening tape 13 is locked at an appropriate position on the outer surface of the ventral portion F.
  • the entire outer surface of the absorbent main body 10 and the side flaps SF is formed by the exterior sheet 12.
  • the liquid-impermeable sheet 11 is fixed to the inner surface side of the exterior sheet 12 with an adhesive such as a hot melt adhesive, and further absorbed to the inner surface side of the liquid-impermeable sheet 11.
  • the body 50, the intermediate sheet 40, and the top sheet 30 are laminated in this order.
  • the top sheet 30 and the liquid-impermeable sheet 11 are rectangular in the illustrated example, have slightly larger dimensions in the front-rear direction LD and the width direction WD than the absorbent body 50, and the side edges of the absorbent body 50 in the top sheet 30.
  • the peripheral edge that protrudes further from the peripheral edge that protrudes from the side edge of the absorbent body 50 in the liquid-impermeable sheet 11 is joined by a hot melt adhesive or the like.
  • the liquid-impermeable sheet 11 is formed to be slightly wider than the top sheet 30.
  • the absorbent main body 10 there are provided side solid gathers 60 that protrude (stand up) toward the wearer's skin, and the gather sheets 62 that form the side solid gathers 60 are tops.
  • the sheet 30 is fixed in a range from both side portions of the sheet 30 to the inner surface of each side flap portion SF.
  • the exterior sheet 12 is a sheet constituting the outer surface of the product.
  • the exterior sheet 12 has a shape in which the center part of the front-rear direction LD on both sides is constricted, and this is a part that surrounds the wearer's leg.
  • the exterior sheet 12 is preferably a non-woven fabric, but is not limited thereto.
  • the type of the nonwoven fabric is not particularly limited, and as the material fiber, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, and natural fibers such as cotton are used.
  • a spunlace method As a processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used.
  • a long-fiber nonwoven fabric such as a spunbond nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric is preferable in that both the touch and strength can be achieved.
  • a plurality of nonwoven fabrics can be used. In the latter case, the nonwoven fabrics are preferably bonded to each other with a hot melt adhesive or the like.
  • the fiber basis weight is desirably 10 to 50 g / m 2 , particularly 15 to 30 g / m 2 .
  • the exterior sheet 12 can be omitted, and in that case, the liquid-impermeable sheet 11 can have the same shape as the exterior sheet 12 to constitute the outer surface of the product.
  • liquid-impermeable sheet 11 The material of the liquid-impermeable sheet 11 is not particularly limited.
  • the liquid-impermeable sheet 11 is substantially made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet, or a waterproof film.
  • Non-woven fabrics that ensure liquid impermeability are composed of waterproof films and non-woven fabrics.
  • materials having liquid impermeability and moisture permeability which have been used and used in recent years from the viewpoint of preventing stuffiness can also be exemplified.
  • an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction.
  • an olefin resin such as polyethylene or polypropylene
  • the microporous sheet obtained in this way can be given.
  • non-woven fabric using micro-denier fiber, strengthening leakage resistance by reducing the voids of the fiber by applying heat or pressure, and applying water-repellent resin or hydrophobic resin or water repellent to waterproof A sheet that is liquid-impermeable without using a film can also be used as the liquid-impermeable sheet 11.
  • the top sheet 30 may be a porous or non-porous nonwoven fabric having liquid permeability.
  • the constituent fiber of the nonwoven fabric is not particularly limited.
  • synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated.
  • the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method.
  • the spun lace method is a preferable processing method for obtaining flexibility and drapeability
  • the thermal bond method is for obtaining bulkiness and softness.
  • the intermediate sheet 40 is joined to the back surface of the top sheet 30 in order to quickly move the excreted liquid that has passed through the top sheet 30 to the absorber 50 side and to prevent reversal.
  • heat embossing or ultrasonic welding can be used in addition to using a hot melt adhesive.
  • a non-woven fabric can be used, and a resin film having a large number of transmission holes can also be used.
  • the non-woven fabric the same material as that described in the section of the top sheet 30 can be used. However, a material having higher hydrophilicity than the top sheet 30 and a material having a higher fiber density are changed from the top sheet 30 to the intermediate sheet 40. This is preferable because of its excellent liquid transfer characteristics.
  • the intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorber 50, but may be provided over the entire width.
  • the length of the intermediate sheet 40 in the front-rear direction LD may be the same as the entire length of the diaper, may be the same as the length of the absorbent body 50, or may be within a short length range centered on the region that receives the liquid. .
  • the side three-dimensional gather 60 is composed of a gather sheet 62 and an elongated elastic elastic member 63 fixed to the gather sheet 62 in a stretched state along the front-rear direction LD.
  • a gather sheet 62 a water-repellent nonwoven fabric can be used, and as the elastic elastic member 63, rubber thread or the like can be used.
  • a plurality of elastic elastic members can be provided in addition to a plurality of elastic expansion members.
  • the inner surface of the gather sheet 62 has a fixing start end in the width direction WD on the side portion of the top sheet 30, and a portion outside the fixing start end in the width direction WD includes the side portion of the liquid-impermeable sheet 11 and the portion concerned. Is fixed to a side portion of the exterior sheet 12 located at a position by a hot melt adhesive or the like.
  • the inner side in the width direction WD from the fixing start end of the side three-dimensional gather 60 is fixed on the top sheet 30 at both ends in the product longitudinal direction LD, but the portion in between is an unfixed free part. Yes, this free part comes to stand by the contraction force of the elastic elastic member 63.
  • the diaper is mounted, the diaper is mounted on the body in the shape of a boat, and since the contraction force of the elastic expansion / contraction member 63 acts, the side three-dimensional gather 60 stands up by the contraction force of the elastic expansion / contraction member 63 and around the leg. In close contact. As a result, so-called side leakage from around the legs is prevented.
  • both ends of the front-rear direction LD in the inner portion of the gather sheet 62 in the width direction WD are connected to a base end side portion extending inward from an outer portion of the width direction WD, and the base end side portion.
  • each side flap portion SF has a gap between the gather sheet 62 and the liquid-impermeable sheet 11 on the outer side in the width direction WD in the vicinity of the fixing start end of the fixing portion of the gather sheet 62.
  • a leg elastic member 64 made of rubber thread or the like is fixed in a state of being stretched along the front-rear direction LD, whereby the leg peripheral portion of each side flap portion SF is configured as a planar gather.
  • the leg elastic member 64 may be disposed between the liquid-impermeable sheet 11 and the exterior sheet 12 in the side flap portion SF. In addition to providing a plurality of leg elastic members 64 on each side as shown in the drawing, only one elastic member 64 can be provided on each side.
  • the fastening tape 13 is a sheet base material that forms a tape attachment portion 13 ⁇ / b> C fixed to a side portion of the diaper and a tape main body portion 13 ⁇ / b> B protruding from the tape attachment portion 13 ⁇ / b> C.
  • a locking portion 13A for the ventral side provided in the intermediate portion in the width direction WD of the tape main body portion 13B in the sheet base material, and the tip side of the locking portion 13A is a knob. is there.
  • the tape attachment portion 13C of the fastening tape 13 is sandwiched between the gather sheet 62 forming the inner layer and the exterior sheet 12 forming the outer layer in the side flap portion, and is bonded to both the sheets 62 and 12 by a hot melt adhesive. . Moreover, 13 A of latching parts are joined to the sheet
  • a hook material male material of a mechanical fastener (surface fastener) is suitable.
  • the hook material has a large number of engaging projections on the outer surface side thereof.
  • the shape of the engagement protrusion there are a letter shape, a J shape, a mushroom shape, a T shape, a double J shape (a shape in which a J shape is combined back to back), etc.
  • the shape may also be Of course, an adhesive layer can also be provided as a locking portion of the fastening tape 13.
  • sheet base material that forms from the tape attachment part to the tape body part
  • various nonwoven fabrics such as spunbond nonwoven fabric, air-through nonwoven fabric, and spunlace nonwoven fabric, plastic film, polylaminated nonwoven fabric, paper, and composite materials thereof are used. be able to.
  • target sheet It is preferable to provide a target sheet 12T having a target for facilitating the locking at the locking portion of the fastening tape 13 in the ventral portion F.
  • a target sheet 12T when the locking portion 13A is a hook material, a target sheet 12T can be used in which a large number of loop yarns are formed on the surface of a sheet base material made of a plastic film or a nonwoven fabric so that the engagement protrusions of the hook material are entangled.
  • an adhesive material layer a sheet base material made of a plastic film having a smooth surface that is rich in adhesiveness can be used.
  • the fastening portion of the fastening tape 13 in the ventral portion F is made of a nonwoven fabric
  • the exterior sheet 12 of the illustrated form is made of a nonwoven fabric
  • the fastening portion 13A of the fastening tape 13 is a hook material.
  • the target sheet 12T may be provided between the exterior sheet 12 and the liquid-impermeable sheet 11.
  • the absorber 50 is a part that absorbs and holds the liquid content of excrement.
  • the absorber 50 can be bonded to at least one of the front and back members via an adhesive such as a hot melt adhesive.
  • the absorbent body 50 is surrounded by the front side sheet 51, the back side sheet 52 disposed on the back side thereof, and the joint portion 54 of the front side sheet 51 and the back side sheet 52, and the front side
  • the cell absorbent body 50 includes a cell (small chamber) 55 to which the sheet 51 and the back sheet 52 are not joined, and the superabsorbent polymer particles 53 placed in the cell 55.
  • the cell absorber 50 can be packaged with a packaging sheet (not shown).
  • one wrapping sheet can be wrapped in a cylindrical shape so as to surround the front and back surfaces and both side surfaces of the absorbent body 50, and can be packaged so as to be sandwiched by two wrapping sheets from both the front and back surfaces.
  • tissue paper particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet having small holes, and the like can be used.
  • the superabsorbent polymer particles be a sheet that does not escape.
  • a nonwoven fabric is used for the packaging sheet, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like.
  • the basis weight is preferably 5 to 40 g / m 2 , particularly 10 to 30 g / m 2 .
  • pulp fibers can be stacked on either the front or back side of the cell absorbent body, and these can be packaged together with the packaging sheet.
  • the front side sheet 51 may be a liquid-permeable material or a liquid-impermeable material, but is preferably a liquid-permeable material when positioned on the top sheet 30 side as shown in the figure. .
  • a porous or non-porous nonwoven fabric or a porous plastic sheet can be used in the same manner as the top sheet 30.
  • the constituent fibers include, for example, synthetic fibers (including single component fibers as well as composite fibers) such as olefins, polyesters, and polyamides such as polyethylene or polypropylene, rayon, Recycled fibers such as cupra, natural fibers such as cotton, and the like can be selected without particular limitation, but thermoplastic resin fibers are preferred in terms of excellent thermal processability.
  • the fiber bonding method of the nonwoven fabric is not particularly limited, but a bonding method that increases the fiber density, such as a spunbond method, a melt blown method, and a needle punch method, is preferable in order to prevent the superabsorbent polymer particles 53 from falling off.
  • the opening diameter is preferably smaller than the outer shape of the superabsorbent polymer particles 53 in order to prevent the superabsorbent polymer particles 53 from falling off.
  • a hydrophilic agent can be contained.
  • a recess 51c that is recessed from the back side to the front side is formed in a portion constituting each cell 55 in the front side sheet 51. Is preferably formed, but may not be formed.
  • the back side sheet 52 can be made of the same material as the front side sheet 51, but when the front side sheet 51 is made of a liquid permeable material, a liquid impermeable material can also be adopted for the back side sheet 52. .
  • the liquid impermeable material that can be used for the back sheet 52 can be appropriately selected from the materials described in the section of the liquid impermeable sheet 11.
  • the front side sheet 51 and the back side sheet 52 can be one layer in which one material is folded in two and the other layer.
  • the superabsorbent polymer particles 53 are not fixed to the front side sheet 51 and the back side sheet 52 and can be freely moved, or can be adhered or adhered to the front side sheet 51 and the back side sheet 52. Further, the superabsorbent polymer particles 53 may be agglomerated to some extent.
  • the particle diameter of the superabsorbent polymer particles is not particularly limited, but for example, screening using a standard sieve (JIS Z8801-1: 2006) of 500 ⁇ m (shaking for 5 minutes), and particles falling under the screen by this screening
  • a standard sieve JIS Z8801-1: 2006
  • the proportion of particles remaining on the 500 ⁇ m standard sieve is 30% by weight or less
  • the 180 ⁇ m standard sieve It is desirable that the proportion of particles remaining on the surface is 60% by weight or more.
  • the material of the superabsorbent polymer particles 53 can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable.
  • the superabsorbent polymer particles 53 include starch-based, cellulose-based and synthetic polymer-based particles such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, sodium carboxymethyl cellulose, and the like. A cross-linked product or an acrylic acid (salt) polymer can be used.
  • As the shape of the superabsorbent polymer particles 53 a commonly used granular material is suitable, but other shapes can also be used.
  • the superabsorbent polymer particles 53 those having a water absorption speed of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too slow, the liquid supplied into the absorbent body 50 tends to cause so-called reversal that returns to the outside of the absorbent body 50.
  • the superabsorbent polymer particles 53 those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 50, the sticky feeling after liquid absorption can be suppressed effectively.
  • the basis weight of the superabsorbent polymer particles 53 can be appropriately determined according to the amount of absorption required for the application of the absorber 50. Therefore, although it cannot be generally stated, it can be 50 to 350 g / m 2 . If the amount of polymer is less than 50 g / m 2, it is difficult to secure the absorption amount. When it exceeds 350 g / m 2 , the effect is saturated.
  • the planar shape of the cell 55 can be determined as appropriate, and can be hexagonal, rhombus, square, rectangular, circular, elliptical, etc. as shown in FIGS. In order to achieve the arrangement, it is desirable to use polygons, and it is desirable to arrange them without gaps as illustrated. 7 to 9 and the like adopt a honeycomb-like arrangement of regular hexagonal cells 55.
  • the cells 55 may be arranged by combining a plurality of types of cells 55 having at least one of shape and size in addition to arranging the same shape and size.
  • regular hexagon includes those in which the front side sheet 51 and the back side sheet 52 are stretched and deformed to ⁇ 5% in the front-rear direction LD due to the influence of expansion and contraction during manufacturing.
  • the planar arrangement of the cells 55 (that is, the gathering portions of the superabsorbent polymer particles 53 are also the same) can be determined as long as it is uniform.
  • a regularly repeated planar arrangement is preferable, as shown in FIG. 16B, a hexagonal lattice shape (also called a staggered shape) as shown in FIG. 16B, a square lattice shape as shown in FIG. 16C, and as shown in FIG. A rectangular grid, a parallel grid as shown in FIG. 16 (e) (a form in which two groups are arranged so that a large number of groups in a parallel diagonal direction intersect each other), etc.
  • the group of cells 55 (the arrangement of the group units may be regular or irregular, such as a pattern or a letter shape) But may be repeated regularly) It can be.
  • each cell 55 can be determined as appropriate.
  • the length 55L in the front-rear direction LD can be about 8 to 30 mm
  • the length 55W in the width direction WD can be about 10 to 50 mm
  • the area of each cell 55 can be about 65 to 1650 mm 2 .
  • seat 52 is provided by the uniform arrangement
  • the joining portion 54 is desirably joined by welding the front side sheet 51 and the back side sheet 52 like ultrasonic welding or heat sealing, but may be joined via a hot melt adhesive.
  • the joint portion 54 of the front side sheet 51 and the back side sheet 52 is arranged so as to surround each cell 55, and as long as it becomes a boundary between adjacent cells, it is a dotted line shape as shown in the figure (intermittently in the direction surrounding each cell 55. ), Or a continuous line shape.
  • the joint portions 54 are formed intermittently, the superabsorbent polymer particles 53 are not present between the joint portions 54 in the direction surrounding the cells 55, or even if they are present, the number of the superabsorbent polymer particles 53 is less than that in the cells 55. .
  • the bonding portion 54 includes a weak bonding portion 54b that can be peeled off by the expansion force of the superabsorbent polymer particles 53 in the adjacent cells 55, and a strong bond that does not peel off due to the expansion force of the superabsorbent polymer particles 53 in the adjacent cells 55.
  • Part 54a As shown in FIG. 13, the cells 55 adjacent to each other across the weakly bonded portion 54 b are separated by the absorption expansion pressure of the superabsorbent polymer particles 53 in the cell 55 and merged to expand into one large cell 55.
  • the strong joint portion 54a is a portion that does not peel even if the cells 55 on both sides thereof absorb and expand, and thus functions to limit the size and height of the combined cell 55.
  • the joining portion 54 may be formed only of the weak joining portion 54b and may not have the strong joining portion 54a.
  • the strong joint 54a is represented by a thick dotted line
  • the weak joint 54b is represented by a thin dotted line.
  • the bonding portion 54 located on the outermost side in the width direction WD is preferably a strong bonding portion 54a because if it peels off, the superabsorbent polymer particles 53 or the gelled product thereof may leak to the side of the absorber 50. .
  • the front side sheet 51 and the back side sheet 52 are extended to some extent outside the cell 55 formation region in the width direction WD, and the edge joint portion 54c is applied to the extended part for reinforcement. preferable.
  • the difference in the bonding strength of the bonding portion 54 may be easy to form by changing the area of the bonding portion 54, but is not limited thereto,
  • the joining portion 54 is formed of a hot melt adhesive
  • a method of making the type of the hot melt adhesive different depending on the site can be employed.
  • the weak joining portion 54b can be formed only by widening the point interval 54D by making the joining portion 54 dotted.
  • the portion 54 is a portion that becomes a boundary between the adjacent cells 55, if the point interval 54 ⁇ / b> D becomes too large, a gap increases at the boundary between the adjacent cells 55, and the superabsorbent polymer particles 53 easily move. Therefore, when the dotted line-shaped weakly bonded portion 54b is formed by combining the width of the line width 54W of the bonded portion 54 and the width of the point interval 54D, the weakly bonded portion 54b portion is easily peeled even though the gap is small. It becomes.
  • the dimensions of the joining portion 54 that joins the front side sheet 51 and the back side sheet 52 can be determined as appropriate.
  • the line width (dimension in the direction perpendicular to the direction surrounding the cell 55) 54W is about 0.6 to 8.0 mm. be able to.
  • the length 54L of the joint portion 54 in the direction surrounding the cell 55 is about 0.6 to 8.0 mm
  • the point interval 54D is The thickness is preferably about 0.8 to 10.0 mm.
  • the line width 54W is about 1.0 to 4.0 mm
  • the length 54L of the joint 54 is about 1.5 to 4.0 mm
  • the point interval 54D is 0.8 to 2.
  • about 5 mm is preferable.
  • the line width 54W is about 0.6 to 3.5 mm
  • the length 54L of the joint 54 is about 0.6 to 2.5 mm
  • the point interval 54D is 1.0 to 4.
  • About 0.0 mm is preferable.
  • the volume at the time of saturated absorption of the superabsorbent polymer particles 53 in the cell 55 is sufficiently larger than the volume of the cell 55 adjacent to the weakly bonded portion 54b.
  • the type and amount of the superabsorbent polymer particles 53 disposed in each cell 55 can be determined.
  • the superabsorbent polymer particles 53 contained in the coalescable cell 55 rather than the volume after the coalescence of the cell 55 that can be coalesced by peeling off the weak joint portion 54b.
  • the type and amount of the superabsorbent polymer particles 53 arranged in each cell 55 can be determined so that the volume at the time of saturated absorption is reduced.
  • the width of the bonding portion 54 when the bonding portion 54 is formed in a continuous line shape, and the line width 54W when the bonding portion 54 is formed in a dotted line shape are fixed in the direction surrounding the cell 55, and may be changed. it can.
  • the shape of each joint 54 in the case where the joint 54 is formed in a dotted line shape can be determined as appropriate, and all the shapes can be the same or different depending on the region.
  • the shape of each cell 55 is a polygon, it is preferable to provide a joint 54 at at least one of the intermediate position and the vertex position of each side. Further, in the case of the strong joint portion 54a, it is preferable to be provided at each vertex position.
  • the weak joint portion 54b is more easily peeled off when not provided at each vertex position, so that the cells 55 are combined. Is preferable because it proceeds smoothly.
  • the shape is preferably a radial (star) shape protruding in the direction of each side.
  • a plurality of rows of strong joints 54a arranged in the width direction WD are provided at intervals in the front-rear direction LD, and are partitioned by rows of these strong joints 54a, and the weak joints 54b.
  • a plurality of the most enlarged sections 57 which are collection regions of the cells 55 adjacent to each other only through the front and rear directions LD, are arranged.
  • the joint strength of the weak joint part 54b in the largest expansion section 57 adjacent to the front and back both sides is weaker than the joint strength of the weak joint section 54b in the largest expansion section 57 including the excretion position Z1 facing the wearer's excretion opening.
  • the joint strength of the weakly joined portion 54b in the most enlarged section 57 adjacent to both the front and rear sides thereof is further weak, such that the sections on both sides of the front and rear direction LD from the excretion position Z1 facing the excretion opening of the wearer (that is, farther away) In fact, the joint strength of the weak joint portion 54b is gradually reduced.
  • the technique for making a difference in bonding strength is the same as that for making a difference in the bonding strength of the above-described strong bonding portion 54a and weak bonding portion 54b.
  • the weakly bonded portion 54b is peeled off due to the expansion of the superabsorbent polymer particles 53, but the strong joined portion 54a is not peeled off. Will merge.
  • urine is excreted at the excretion position Z1, and as shown in FIG. 9, the urine spreads around and spreads to the region Z2, and the urine is absorbed at the high absorbency at each position. Assume that the polymer particles 53 absorb. At this time, as shown in FIG. 13, the cell 55 in which the expansion pressure of the internal superabsorbent polymer particles 53 is increased is separated from the adjacent weak joint 54 b without resisting the expansion pressure.
  • FIG. 12 shows a state in which only the weakly joined portion 54b in the region Z2 is peeled off, and all the cells 55 are combined in the most enlarged section 57 in which urine is diffused throughout.
  • the ring in which the strong joints 54a are arranged is provided in multiple rings around the excretion position Z1, and is partitioned by the ring of these strong joints 54a, and is adjacent to the cell 55 only through the weak joint 54b.
  • a configuration is also proposed in which the most enlarged sections 57, which are the gathering regions of the two, are formed in a multi-ring shape, and the joint strength of the weakly joined portion 54b becomes weaker toward the radially outer side with respect to the excretion position Z1. Is done. That is, since the excreted liquid basically diffuses in the radial direction from the excretion position Z1, it is one preferable mode to change the joint strength of the weakly joined portion 54b in the radial direction centered on the excretion position Z1.
  • a sufficient effect can be expected even if the number of steps at which the bonding strength of the weakly bonded portion 54b is weakened is one step, but it is desirable that the number of steps be changed by two or more steps.
  • the absorption promotion region where the bonding strength of the weakly bonded portion 54b changes is preferably provided over the entire absorber 50 as shown in the figure, but the absorption promotion region is a part of the absorber 50, for example, the front-rear direction. It may be formed only in the LD intermediate portion, and in that case, the bonding strength of the weak bonding portion 54b may be stronger than the absorption promoting region other than the absorption promoting region.
  • the gelled product of the superabsorbent polymer particles 53 expanded at the time of absorption can move greatly in the merged cell 55, and the gelled product is low in the crotch portion or the like. There is a risk that the wearing feeling will worsen.
  • the strong joint portion 54a is provided at the boundary where the joint strength of the weak joint portion 54b changes like the most enlarged section 57 in the form shown in FIGS. 9 and 14, the joint of the weak joint portion 54b.
  • the strong joint 54a can be provided in an appropriate arrangement regardless of the boundary where the joint strength of the weak joint 54b changes.
  • the bonding strength of the weakly bonded portion 54b changes in the same pattern as that shown in FIG. 9 or the shape shown in FIG. It can be provided in the pattern shown in FIG.
  • the portion connecting two continuous sides per cell 55 can be a linear portion at the periphery of the most enlarged section 57.
  • a portion connecting three continuous sides per cell 55 can be a straight portion or a corner portion (direction changing portion) having an internal angle of 120 degrees, and a portion connecting four continuous sides per cell 55 Can be a direction change portion with an internal angle of 60 degrees or 180 degrees.
  • the peripheral shape (arrangement of the strong joint portions 54a) of the most enlarged section 57 can be changed to a substantially triangular shape, a substantially rectangular shape, a substantially circular shape, a substantially trapezoidal shape, or a substantially trapezoidal shape.
  • An appropriate shape such as a parallelogram shape can be used.
  • the maximum expansion section 57 composed of a set of a plurality of cells 55 has three or more cells 55 arranged in two or more directions, and the peripheral shape is one in the cells 55 along the periphery.
  • the cell 55 has a closed shape formed by connecting two to four continuous sides. As a result, the cells 55 are merged sequentially and are easily expanded smoothly to the maximum expansion section 57.
  • the maximum expansion section 57 has a shape that easily expands and expands to the maximum expansion section 57. Increases the amount of increase.
  • the weak bonding portion 54b peels off due to the expansion of the superabsorbent polymer particles 53 during the absorption of excretory fluid. Since the portion 54a does not peel off, adjacent cells 55 are joined together by peeling off the weakly joined portion 54b, but the size and height of the joined cell 55 are limited by the strong joined portion 54a. That is, as the collection area has a larger number of cells 55, the united cell 55 becomes larger and higher when absorbing the excretory fluid. Therefore, as shown in FIGS.
  • the number of the cells 55 included in the region is increased as the aggregation region of the cells 55 in which the bonding strength of the weakly bonded portion 54 b is weak.
  • the content per unit area of the superabsorbent polymer particles 53 may be constant regardless of the change in the joint strength of the weak joint portion 54b, but the cell 55 aggregate region having a weak joint strength of the weak joint portion 54b has a higher absorbency. Changes can be made such as increasing the content of the polymer particles 53 or vice versa.
  • the change in the content of the superabsorbent polymer particles 53 can be determined as appropriate. For example, the highest content portion is about 450 to 1000 g / m 2 , and the lowest content portion is 1 / of the highest content portion. It can be about 2 to 1/10 times.
  • FIG. 9 it is possible to provide empty cells 56 in which the amount of inclusion of the superabsorbent polymer particles 53 per unit area is smaller than other cells.
  • the cell 55 containing the superabsorbent polymer particles 53 is hatched.
  • subjected the oblique line pattern assumes the shape of the dispersion
  • the inclusion amount of the superabsorbent polymer particles 53 in the empty cell 56 is preferably 1/2 or less, particularly 1/10 or less of the other cells 55 in terms of weight ratio, and particularly preferably not contained at all.
  • the front end and the rear end of the absorbent body 50 are formed by cutting into individual absorbent bodies 50 at the time of manufacture. Therefore, if the superabsorbent polymer particles 53 are contained at this position, the absorbent body 50 is cut. The life of the blade of the device may be shortened. Therefore, it is desirable that the cell 55 at a position where at least the front and rear ends pass is an empty cell 56.
  • the middle part of the front-rear direction LD is narrowed in the width direction WD along the leg circumference.
  • the cells on both sides in the middle of the front-rear direction LD are formed as empty cells 56, thereby Is less swelled after absorption, and therefore, the absorber 50 is shaped to fit around the legs even after absorption.
  • one or a plurality of rows of cells 55 located at the center of the width direction WD may be empty cells 56.
  • the empty cell 56 has a smaller expansion amount than the cells 55 on both sides in the width direction WD, a groove extending in the front-rear direction LD is formed at the center of the width direction WD when absorbing excretory fluid, Liquid diffusion is promoted by the groove.
  • the empty cell 56 at the center in the width direction WD may be provided over the entire length of the absorber 50.
  • an intermediate portion in the front-rear direction LD (particularly, including the crotch portion and the range over both the front and rear sides). ) May be provided.
  • the cell absorber 50 When the cell absorber 50 is manufactured, it is difficult to accurately distribute a predetermined amount of the superabsorbent polymer particles 53 to the individual cells 55. Therefore, the superabsorbent polymer particles 53 on the front side sheet 51 or the back side sheet 52 are difficult to distribute. After the superabsorbent polymer particles 53 are uniformly dispersed over the entire containing region (the region excluding the portion that becomes the empty cell 56), the joint portion 54 is formed, and the front side sheet 51 and the back side sheet 52 are integrated. It is preferable to enclose the superabsorbent polymer particles 53 in the cell 55.
  • the superabsorbent polymer particles 53 cannot be dispersed in an accurate shape that coincides with the periphery of the cell 55, particularly on the peripheral cell 55 of the region containing the superabsorbent polymer particle 53.
  • the shape of the spraying region 53A of the superabsorbent polymer particles 53 indicated by diagonal lines it is desirable to spray the superabsorbent polymer particles 53 so that the periphery of the spraying region 53A passes through the middle of the peripheral cell 55. .
  • the amount of inclusion of the superabsorbent polymer particles 53 in the peripheral cell 55 is smaller than the cell 55 located on the inner side of the peripheral cell 55, and when the cell 55 is provided outside the peripheral cell 55, This outer cell 55 becomes an empty cell 56 that does not substantially contain the superabsorbent polymer particles 53.
  • the superabsorbent polymer particles 53 are encapsulated in the cell 55, but it is also possible to encapsulate powders other than the superabsorbent polymer particles 53 such as deodorant particles together with the superabsorbent polymer particles 53. it can.
  • the largest enlarged section 57 composed of a set of a plurality of cells 55 or a single cell 55 surrounded by the joints 54 and having only the weak joints 54b located between the cells 55.
  • positioning is sparse and it can also be set as the form which does not have the largest expansion division 57.
  • it can also be set as the form which does not have the strong junction part 54a other than a peripheral part at least.
  • MD direction and CD direction mean the flow direction (MD direction) in production equipment and the transverse direction (CD direction) perpendicular to this, and either one is the front-rear direction of the product. The other is the width direction of the product.
  • the MD direction of the nonwoven fabric is the direction of fiber orientation of the nonwoven fabric.
  • the fiber orientation is the direction along which the fibers of the nonwoven fabric are aligned.
  • the fiber orientation can be determined from the measurement method according to the TAPPI standard method T481, the fiber orientation test method using the zero-range tensile strength, and the tensile strength ratio in the front-rear direction and the width direction. It can be discriminated by a simple measuring method for determining the orientation direction.
  • -"Developed state” means a state where the plate is flattened without contraction or slack.
  • “Elongation rate” means a value when the natural length is 100%.
  • Articleificial urine is urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97 0.09 wt% is mixed and used at a temperature of 40 degrees unless otherwise specified.
  • -"Gel strength is measured as follows. Add 1.0 g of superabsorbent polymer to 49.0 g of artificial urine and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C.
  • ⁇ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ⁇ 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%.
  • a sample with a size of 200 mm ⁇ 250 mm ( ⁇ 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm ⁇ 250 mm, ⁇ 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight. “Thickness” is automatically measured using an automatic thickness meter (KES-G5 handy compression tester) under the conditions of load: 10 gf / cm 2 and pressure area: 2 cm 2 . The water absorption is measured according to JIS K7223-1996 “Test method for water absorption of superabsorbent resin”.
  • the water absorption rate is the “time to end point” when JIS K7224-1996 “Test method for water absorption rate of superabsorbent resin” is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. . ⁇ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in a standard state (test location is temperature 20 ⁇ 5 ° C, relative humidity 65% or less). . -Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.
  • the present invention can be applied to absorbent articles in general, such as tape-type disposable diapers as in the above example, other types of disposable diapers such as pants and pad types, and sanitary napkins.
  • SYMBOLS 11 Liquid impervious sheet, 12 ... Exterior sheet, 12T ... Target sheet, 13 ... Fastening tape, 13A ... Locking part, 13B ... Tape body part, 13C ... Tape attachment part, 30 ... Top sheet, 40 ... Intermediate sheet , 60 ... side solid gathers, 62 ... gather sheets, 50 ... absorbers, 51 ... front side sheets, 51c ... dents, 52 ... back side sheets, 53 ... superabsorbent polymer particles, 54 ... joints, 54a ... strong joints 54b ... weak joint, 54c ... edge joint, 55 ... cell, 56 ... empty cell, 57 ... most enlarged section, LD ... front-back direction, WD ... width direction, Z1 ... excretion position.

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  • 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

Le but de la présente invention est d'améliorer l'absorption en utilisant des parties d'un corps absorbant les cellules à l'écart d'un point d'excrétion. La présente invention est pourvue d'un corps absorbant (50) ayant : un grand nombre de cellules (55) dont chacune est entourée par une partie liée (54) d'une feuille avant (51) et d'une feuille arrière (52) et dans laquelle la feuille avant (51) et la feuille arrière (52) ne sont pas liées l'une à l'autre; et un matériau granulaire qui est compris dans les cellules (55) et qui contient des particules de polymères superabsorbantes (53). La partie liée (54) comprend une section faiblement liée (54b) qui peut être séparée par la force d'expansion des particules de polymères superabsorbantes (53) dans des cellules adjacentes (55). Le corps absorbant (50) a une région favorisant l'absorption, comprenant un point d'excrétion (Z1), qui fait face à l'ouverture excrétoire d'un utilisateur et a au moins une partie de la zone autour du point d'excrétion (Z1). Dans la région favorisant l'absorption, les régions collectives de cellules (55), qui sont adjacentes uniquement à travers la section faiblement liée (54b), sont disposés dans au moins une direction à partir du point d'excrétion qui fait face à l'ouverture excrétoire de l'utilisateur, et plus une région collective est éloignée du point d'excrétion (Z1), plus la force de liaison des sections faiblement liées (54b) est faible.
PCT/JP2017/017811 2016-07-26 2017-05-11 Article absorbant. WO2018020775A1 (fr)

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JP2016-146293 2016-07-26

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09504207A (ja) * 1993-10-29 1997-04-28 キンバリー クラーク コーポレイション 水感応性及び水非感応性構造を有する区分状ポケット内に配置された超吸収材料を有する吸収性物品
JP2009061230A (ja) * 2007-09-10 2009-03-26 Kao Corp 吸収性物品
JP2014500736A (ja) * 2010-10-20 2014-01-16 フィンカ ベーフェーベーアー 環境に優しい吸収性構造体

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Publication number Priority date Publication date Assignee Title
JP4315601B2 (ja) * 2001-01-19 2009-08-19 花王株式会社 使い捨ておむつ
JP5144439B2 (ja) * 2008-09-09 2013-02-13 白十字株式会社 使い捨て吸収性物品およびアウタ型吸収性物品

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09504207A (ja) * 1993-10-29 1997-04-28 キンバリー クラーク コーポレイション 水感応性及び水非感応性構造を有する区分状ポケット内に配置された超吸収材料を有する吸収性物品
JP2009061230A (ja) * 2007-09-10 2009-03-26 Kao Corp 吸収性物品
JP2014500736A (ja) * 2010-10-20 2014-01-16 フィンカ ベーフェーベーアー 環境に優しい吸収性構造体

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