WO2023181483A1 - 吸収性物品 - Google Patents

吸収性物品 Download PDF

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Publication number
WO2023181483A1
WO2023181483A1 PCT/JP2022/040479 JP2022040479W WO2023181483A1 WO 2023181483 A1 WO2023181483 A1 WO 2023181483A1 JP 2022040479 W JP2022040479 W JP 2022040479W WO 2023181483 A1 WO2023181483 A1 WO 2023181483A1
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WO
WIPO (PCT)
Prior art keywords
absorbent
sheet
superabsorbent polymer
groove
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/040479
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English (en)
French (fr)
Japanese (ja)
Inventor
彩 大島
彩 高橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daio Paper Corp
Original Assignee
Daio Paper Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daio Paper Corp filed Critical Daio Paper Corp
Priority to JP2024509734A priority Critical patent/JPWO2023181483A1/ja
Publication of WO2023181483A1 publication Critical patent/WO2023181483A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes

Definitions

  • the present invention relates to an absorbent article including a disposable diaper (for example, a pad type disposable diaper).
  • a disposable diaper for example, a pad type disposable diaper.
  • the absorbent article disclosed in Patent Document 1 has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet.
  • the absorbent body includes a first tube extending in the longitudinal direction and the width direction and penetrating the absorbent body in the thickness direction in a region rearward in the longitudinal direction from the longitudinal center of the absorbent body.
  • An auxiliary absorbent body is provided, and the auxiliary absorbent body includes, in plan view, a sealed area where the upper sheet is joined to the lower sheet, and a plurality of non-sealed areas where the upper sheet is not joined to the lower sheet. , and a superabsorbent polymer is distributed between the upper layer sheet and the lower layer sheet in the non-sealed area. According to this absorbent article, leakage of bodily fluids from the rear side can be effectively prevented.
  • the absorbent article disclosed in Patent Document 2 is an absorbent article in which an absorbent body is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and the absorbent body is made of pulp and a superabsorbent polymer. and a lower layer absorbent body, which is arranged adjacent to the non-skin side of the upper layer absorbent body and has a superabsorbent polymer arranged between two layers of sheets. An opening extending in the longitudinal direction is formed in the body, and a groove is formed on the skin-contacting surface side of the absorbent article by recessing the liquid-permeable top sheet into the opening. According to this absorbent article, it is said that it is possible to ensure a sufficient amount of absorption despite being thin, and also to be able to quickly diffuse body fluids to increase absorption speed and suppress backflow.
  • the conventional absorbent article 100 described above is shown in FIG.
  • the adhesion generally hot melt adhesion is often used
  • the adhesive part 136 formed at the bottom of the groove 140 is weak against liquids and easily peels off when it comes into contact with liquid.
  • the absorbent body 123 upper absorbent body 123A and lower absorbent body 123B in FIG. 11
  • the absorbent body 123 expands and increases in thickness. direction
  • the adhesive is likely to peel off from this point as well. Due to the above-mentioned factors, when urination is repeated multiple times, the adhesive tends to gradually peel off.
  • an object of the present invention is to provide an absorbent article that can maintain the groove space even when urinating multiple times and suppress a decrease in absorption speed.
  • An absorbent article having a crotch region, and a front portion and a rear portion extending on both sides of the crotch region, liquid-permeable top sheet, liquid-impermeable backsheet, an absorbent body interposed between the top sheet and the back sheet,
  • the absorbent body in the crotch area is provided with a groove recessed from the front side to the back side so as to extend in the front-rear direction, Inside the groove, A superabsorbent polymer sheet having a first sheet provided on the front side, a second sheet provided on the back side, and superabsorbent polymer particles held between the first sheet and the second sheet is provided.
  • an absorbent article characterized by:
  • the superabsorbent polymer sheet inside the groove absorbs urine and expands.
  • the degree of expansion of the superabsorbent polymer sheet that expands inside the groove is limited by adjusting the amount of superabsorbent polymer particles.
  • the absorbent portion of the superabsorbent polymer sheet with the superabsorbent polymer particles is The absorbent article according to the first aspect, wherein the grooves are provided intermittently along the front-rear direction.
  • the absorbent portion of the superabsorbent polymer sheet with the superabsorbent polymer particles is It is also provided in an adjacent part on the outside in the width direction of the groove,
  • the absorbent part of the adjacent part is
  • the absorbent article according to the second aspect wherein the absorbent article is provided at a position bridging a rear end portion and a front end portion of the absorbent portion that is intermittently provided in the groove.
  • an absorbing portion is also arranged in an adjacent portion on the outside in the width direction of the groove.
  • the absorbent part arranged in this adjacent part is located at a position bridging the rear end and front end of the absorbent parts provided intermittently in the groove, that is, adjacent to the part inside the groove where no absorbent part exists. placed in position.
  • the absorbent part placed in the adjacent part and the absorbent part placed inside the groove expand, the part inside the groove where the absorbent part does not exist becomes surrounded by the expanded absorbent parts. It is possible to prevent the expanded absorbent body from entering the portion of the groove where no absorbent portion exists.
  • the absorbent portion of the superabsorbent polymer sheet with the superabsorbent polymer particles is are provided intermittently along the front-rear direction at different positions on the left and right sides of the groove,
  • the absorption portion on the right side of the groove is
  • the absorbent article according to the first aspect wherein the absorbent article is provided at a position bridging a rear end portion and a front end portion of the absorbent portion that is intermittently provided in the left side portion of the groove.
  • the absorbent portion is provided intermittently along the front-rear direction on the left side of the groove, and the absorber is provided intermittently on the right side of the groove along the front-rear direction, and the absorber is provided on the left side and the right side of the groove intermittently.
  • the absorbing portions are provided at different positions. Specifically, the absorbent part on the right side of the groove is located at a position bridging the rear end and front end of the absorbent part provided intermittently on the left side of the groove, that is, on the left side of the groove. It was placed in a position adjacent to the part where no absorbent part exists.
  • FIG. 2 is a plan view showing the inner surface of the pad type disposable diaper according to the first embodiment in an unfolded state.
  • FIG. 3 is a plan view showing only the main parts.
  • 2 is a sectional view taken along line XX in FIG. 1.
  • FIG. 2 is a sectional view taken along YY line in FIG. 1.
  • FIG. (5-1) A cross-sectional view showing the state before urine absorption in FIG. 4;
  • (5-2) A cross-sectional view showing the state after urine absorption in FIG. 4. It is a figure which shows the pad type disposable diaper based on 2nd Embodiment.
  • (6-1) A plan view showing only the main parts.
  • (6-1) A plan view showing only the main parts.
  • (6-2) It is an AA sectional view of the above (6-1).
  • (10-1) It is a FF sectional view of (9-1) above of the diaper after urine absorption.
  • (10-2) A GG cross-sectional view of the diaper (9-1) after urine absorption. It is a cross-sectional view of a main part of a conventional absorbent article (pad type disposable diaper), and shows the same part as the cross-sectional view (FIG. 5) of a main part of an absorbent article (pad type disposable diaper) according to the present invention. It is something.
  • (11-1) A cross-sectional view showing the state before urine absorption; (11-2) A cross-sectional view showing the state after urine absorption.
  • crotch area refers to the part that corresponds to the groin area of the body during use, and depending on the product, it may range from the center or vicinity of the front-rear direction LD of the article to a predetermined part on the front side, as shown in the figure. or a predetermined range in the center of the article in the front-rear direction LD.
  • a predetermined range in the front-rear direction with the smallest width part of one or both of the constriction parts as the center in the front-rear direction. means.
  • the "front part (ventral part)” means the part in front of the groin part
  • the "rear part (dorsal part)” means the part behind the groin part.
  • Adhesives can be used as a bonding means for bonding each component, such as solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating (hot melt adhesive in letterpress method).
  • the fixed portion of the elastic member is formed by coating the outer peripheral surface of the elastic member using a comb gun or SureWrap coating.
  • hot melt adhesives include EVA adhesives, adhesive rubber adhesives (elastomer adhesives), olefin adhesives, and polyester/polyamide adhesives, which can be used without particular limitation.
  • a joining means for joining each component means by material welding such as heat sealing or ultrasonic sealing can also be used.
  • FIG. 1 to 4 show a pad type disposable diaper 200 as an example of an absorbent article.
  • This pad type disposable diaper 200 has a crotch area C2, and a front part F2 and a rear part B2 extending on both sides of the crotch part C2.
  • the dimensions of each part can be determined as appropriate; for example, the total length (length in the front-rear direction) L of the article may be approximately 350 to 700 mm, and the total width W1 may be approximately 130 to 400 mm (but wider than the width of the absorbent surface of the diaper).
  • the length of the groin area C2 in the front-back direction is about 10 to 150 mm
  • the length of the front part F2 is about 50 to 350 mm
  • the length of the back part B2 is about 50 to 350 mm.
  • the width W3 of the crotch portion C2 can be set to 150 mm or more, particularly about 200 to 260 mm, in the case of an adult.
  • the pad type disposable diaper 200 has a basic structure in which an upper absorbent layer 23A and a lower absorbent layer 23B are interposed between a liquid-impermeable back sheet 21 and a liquid-permeable top sheet 22. .
  • a back sheet 21 is provided on the back side DS of the upper absorbent core 23A and the lower absorbent core 23B so as to slightly protrude from the periphery of the upper absorbent core 23A and the lower absorbent core 23B.
  • the backsheet 21 in addition to a polyethylene film, a sheet having moisture permeability without impairing water-blocking properties can be used to prevent stuffiness.
  • This water-blocking and moisture-permeable sheet is a microporous sheet obtained by melt-kneading an inorganic filler into an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in uniaxial or biaxial directions. Can be used.
  • the outer surface of the backsheet 21 is covered with an exterior sheet 27 made of non-woven fabric, and this exterior sheet 27 protrudes outward from the periphery of the backsheet 21 with a predetermined protrusion width.
  • Various nonwoven fabrics can be used as the exterior sheet 27.
  • the material fibers constituting the nonwoven fabric in addition to synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupro, and natural fibers such as cotton can be used.
  • the exterior sheet 27 can also be omitted.
  • the front side US of the upper absorbent core 23A and the lower absorbent core 23B is covered with a top sheet 22 having liquid permeability.
  • the upper absorbent core 23A and the lower absorbent core 23B partially protrude from the side edges of the top sheet 22, but the width of the top sheet 22 is adjusted so that the side edges of the upper absorbent core 23A and the lower absorbent core 23B do not protrude. You can also expand it.
  • Various nonwoven fabrics can be used as the top sheet 22.
  • the constituent fibers of the nonwoven fabric may be short fibers or long fibers (continuous fibers), and synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and amide fibers (even if they are monocomponent fibers or multiple fibers).
  • synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and amide fibers (even if they are monocomponent fibers or multiple fibers).
  • recycled fibers such as rayon and cupra, natural fibers such as cotton, etc.
  • the method for bonding the fibers of the nonwoven fabric is not particularly limited, and in addition to chemical means such as adhesives and solvents, physical means such as mechanical entanglement and thermal adhesion can be used.
  • One of the preferred nonwoven fabrics for the top sheet is an air-through nonwoven fabric made by bonding thermoplastic synthetic fibers with hot air. Details of the top sheet 22 will be described later.
  • An intermediate sheet 25 is interposed between the top sheet 22 and the upper absorbent core 23A (in the range where the upper absorbent core 23A is not on the skin side of the lower absorbent core 23B, between the top sheet 22 and the lower absorbent core 23B). It is desirable to do so.
  • This intermediate sheet 25 is provided to prevent the urine UR absorbed by the upper layer absorbent body 23A and the lower layer absorbent body 23B from returning, and is made of a material with low water retention and high liquid permeability, such as various nonwoven fabrics. It is desirable to use a mesh film or the like.
  • the front end of the intermediate sheet 25 is preferably located in a range of 0 to 11%, and the rear end of the intermediate sheet 25 is It is preferably located in the range of 92 to 100%.
  • the width W4 of the intermediate sheet 25 is preferably about 50 to 100% of the minimum width W5 of the waist portion 23n of the upper absorbent core 23A and the lower absorbent core 23B, which will be described later.
  • the intermediate sheet 25 can also be omitted.
  • the exterior sheet 27 and the top sheet 22 are extended and bonded together on both front and rear sides of the upper absorbent core 23A and the lower absorbent core 23B, respectively, beyond the front and rear ends of the upper absorbent core 23A and the lower absorbent core 23B.
  • An end flap portion EF is formed in which neither 23A nor the lower absorbent core 23B is present.
  • the outer sheet 27 extends outward from the side edges of the upper absorbent core 23A and the lower absorbent core 23B, and from this extended portion to the side of the top sheet 22.
  • the outer part 24x in the width direction WD of the gather sheet 24s forming the three-dimensional gathers 24 is pasted over the entire front and back direction LD, and the side flap part SF where the upper absorbent layer 23A and the lower absorbent layer 23B are not present is attached. It consists of These bonded parts can be formed using hot melt adhesive, heat sealing, or ultrasonic sealing.
  • the back sheet 21 can be extended to the side flap part SF in place of the exterior sheet 27 to form the outer surface side of the side flap part SF.
  • a plastic sheet or a melt-blown nonwoven fabric can be used as the material for the gather sheet 24s
  • a nonwoven fabric that has been treated to be water repellent with silicone or the like is preferably used in terms of feel on the skin.
  • a portion 24c on the center side in the width direction of the gather sheet 24s extends above the top sheet 22, and at the end on the center side in the width direction, a slender elastic member 24G is stretched in the front-rear direction. It is fixed with melt adhesive or the like.
  • the elongated elastic member 24G may be formed into a thread, string, or band shape such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene-butadiene, silicone, polyester, etc. , commonly used materials can be used.
  • both gather sheets 24s have a widthwise outer portion 24x that is bonded and fixed to the inner surface of the article (in the illustrated embodiment, the top sheet 22 surface and exterior sheet 27 inner surface) over the entire front and back direction, and a widthwise center portion 24x.
  • 24c is bonded and fixed to the inner surface of the article (the surface of the top sheet 22 in the illustrated form) at both ends in the front-rear direction, and fixed to the inner surface of the article (the surface of the top sheet 22 in the illustrated embodiment) between both ends in the front-rear direction. do not have. As shown in FIG.
  • this non-fixed portion is a portion that serves as a leak-preventing wall that elastically stands up against the inner surface of the article (the surface of the top sheet 22 in the illustrated form), and its upright base end 24b is a part of the gathered sheet. It is located at the border between the fixed portion 24x on the outside in the width direction and the central portion 24c in 24s.
  • the upper layer absorbent body 23A and the lower layer absorbent body 23B are basically a stack of pulp fibers, an aggregate of filaments such as cellulose acetate, or a nonwoven fabric, and if necessary, superabsorbent polymer particles such as particulates are mixed therein. It is possible to use a material formed by fixing or the like.
  • the upper absorbent core 23A and the lower absorbent core 23B may have a two-layer structure consisting of a lower absorbent core 23B and an upper absorbent core 23A provided on the skin side (front side US), or may have a single-layer structure or a structure of three or more layers. There may be.
  • the lower absorbent core 23B is preferably at least an aggregate of pulp fibers, particularly a mixed aggregate of pulp fibers and superabsorbent polymer particles. It is preferable to have one.
  • the upper layer absorbent body 23A is preferably a mixed aggregate of pulp fibers and superabsorbent polymer particles.
  • the superabsorbent polymer particles contained in the upper absorbent core 23A and the lower absorbent core 23B those used in this type of absorbent article can be used as they are; for example, particles with the same particle size in the upper absorbent core 23A and the lower absorbent core 23B
  • sieving using a 500 ⁇ m standard sieve JIS Z8801-1:2006
  • shaking for 5 minutes and dropping under this sieving sieve are performed.
  • the proportion of particles remaining on the 500 ⁇ m standard sieve is 30% by weight or less, and the 180 ⁇ m It is desirable that the proportion of particles remaining on the standard sieve is 60% by weight or more.
  • the particle size distribution of the superabsorbent polymer particles used for the upper layer absorber 23A is the standard 500 ⁇ m and 180 ⁇ m described above.
  • the proportion of particles remaining on a 500 ⁇ m standard sieve is 50% by weight or less, and the proportion of particles remaining on a 180 ⁇ m standard sieve is 50% by weight or more, and the lower layer absorption
  • the particle size distribution of the superabsorbent polymer particles used in Body 23B is such that when sieving is performed using the above-mentioned 500 ⁇ m and 180 ⁇ m standard sieves, the proportion of particles remaining on the 500 ⁇ m standard sieve is 25% by weight or less, and the particle size is 180 ⁇ m. It is desirable that the proportion of particles remaining on the standard sieve is 70% by weight or more.
  • the superabsorbent polymer particles are not particularly limited, but those having a water absorption rate of 20 to 50 seconds and a water absorption amount of 50 to 80 g/g can be suitably used.
  • Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles, including starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and cross-linked sodium carboxymethyl cellulose. Materials such as acrylic acid (salt) and acrylic acid (salt) polymers can be used.
  • the upper layer absorbent body 23A and the lower layer absorbent body 23B are integrally or individually coated with a packaging sheet 26 having liquid permeability and liquid retention properties such as crepe paper to maintain the shape and superabsorbent polymer particles as necessary. It can be wrapped by
  • the upper absorbent core 23A and the lower absorbent core 23B extend from the front portion F2 to the rear portion B2. Although the upper absorbent core 23A may have the same dimensions as the lower absorbent core 23B, it is desirable that the overall length and width of the upper absorbent core 23A be shorter than those of the lower absorbent core 23B, as in the illustrated embodiment. Normally, the total length of the upper absorbent core 23A can be approximately 60 to 90% of the total length of the lower absorbent core 23B, and the total width of the upper absorbent core 23A can be approximately 60 to 90% of the total width of the lower absorbent core 23B. be able to.
  • the shapes of the upper absorbent core 23A and the lower absorbent core 23B can be determined as appropriate, and each can be rectangular, but at least the larger one of the upper absorbent core 23A and the lower absorbent core 23B (in the illustrated example, the lower absorbent core 23B)
  • a predetermined portion in the middle in the front-rear direction including the crotch portion C2 is formed as a narrow constriction portion 23n.
  • the minimum width W5 of the constricted portion 23n is preferably about 50 to 65% of the width W2 of the non-constricted portions located before and after the constricted portion 23n.
  • the front end of the article is 0% and the rear end of the article is 100%, it is preferable that the front end of the constricted portion 23n is located in a range of 10 to 25%, and the rear end of the constricted portion 23n is located in a range of 40 to 65%.
  • the minimum width W5 of the constricted portion 23n is preferably located within a range of 25 to 30%.
  • the thickness of the upper layer absorbent core 23A and the lower layer absorbent core 23B can be determined as appropriate.
  • the thickness 23AT (length in the thickness direction TD; the same applies hereinafter) of the upper absorbent core 23A is preferably about 3 to 20 mm; It is more preferable to set it to about 12 mm.
  • the thickness 23BT (length in the thickness direction TD; the same applies hereinafter) of the lower absorbent core 23B is preferably about 3 to 20 mm; It is more preferable to set it to about 5 to 10 mm.
  • the portion of the upper layer absorbent body 23A near the urinary opening (a circular area with a radius of approximately 20 mm centered on the portion that contacts the wearer's urinary opening; hereinafter referred to as the "urination area”) has a urine UR of approximately 150 to 300 mL.
  • the thickness 23AT of the upper layer absorbent body 23A is preferably about 5 to 30 mm, and preferably about 7 to 15 mm.
  • the thickness 23BT of the lower absorbent body 23B is 5 to 30 mm. It is preferable that the thickness be about 7 to 15 mm, and more preferably about 7 to 15 mm.
  • the thickness 23AT of the upper layer absorbent body 23A is approximately 5 to 40 mm. It is preferable that the thickness be approximately 10 to 30 mm, and more preferably approximately 10 to 30 mm.
  • the thickness 23BT of the lower absorbent body 23B should be about 5 to 40 mm. is preferable, and more preferably about 10 to 30 mm.
  • grooves 40 of a predetermined width are formed in the upper absorbent core 23A and the lower absorbent core 23B in the front-rear direction region corresponding to the crotch area C2, and are recessed from the front side US to the back side DS. It is provided so as to extend in the front-rear direction. Note that this groove 40 is preferably formed so as to penetrate the upper layer absorbent core 23A and the lower layer absorbent core 23B in the thickness direction. However, although it is preferable to penetrate the upper absorbent core 23A, it is not always necessary to penetrate the lower absorbent core 23B.
  • the longitudinal length 40L of the groove 40 extends from the crotch-side end of the front part F2 to the crotch-side end of the rear part B2, as shown in the figure. More specifically, when the front end of the pad type disposable diaper 200 is taken as 0% and the rear end of the pad type disposable diaper 200 is taken as 100%, the front end of the groove 40 is located in the range of 15 to 30%. Preferably, the rear end of the groove 40 is located within a range of 40 to 70%.
  • the width of the upper layer absorbent body 23A and the lower layer absorbent body 23B is wider than the width of the wearer's crotch, and both widthwise ends of the crotch area are opposite to the wearer's inner thighs, and the widthwise middle portion is wider than the wearer's crotch width.
  • the width 40W of the groove 40 is normally preferably about 10 to 30% of the minimum width W5 of the constricted portion 23n of the upper absorbent core 23A and the lower absorbent core 23B.
  • the width 40W of the groove 40 is not particularly limited as long as the opposing side walls are spaced apart, but in normal cases, it is about 10 to 20% of the minimum width W5 of the constricted portion 23n of the upper absorbent core 23A and the lower absorbent core 23B. Specifically, in the case of products for adults, it can be approximately 5 to 32 mm.
  • first sheet 31 for example, a first nonwoven fabric layer or a first paper layer
  • second sheet 32 provided on the back side DS
  • first sheet 31 A superabsorbent polymer sheet 34 is provided having superabsorbent polymer particles held between the second sheets 32 (eg, a second nonwoven layer or a second paper layer).
  • first sheet 31 examples include nonwoven fabric and paper.
  • second sheet examples include nonwoven fabric and paper.
  • the superabsorbent polymer sheet 34 includes, for example, a first nonwoven fabric layer (corresponding to the first sheet 31), a second nonwoven fabric layer (corresponding to the second sheet 32), and these first nonwoven fabric layers. and superabsorbent polymer particles held between the second nonwoven layer and the second nonwoven layer. Adjacent layers in this laminate are preferably bonded to each other with a hot melt adhesive or the like.
  • the first nonwoven fabric layer and the second nonwoven fabric layer are not particularly limited, but bulky air-through nonwoven fabrics are preferable because the feel of the superabsorbent polymer particles is difficult to convey to the skin and it is possible to secure space for the superabsorbent polymer particles to swell. suitable.
  • the fineness and basis weight of the fibers in the first nonwoven fabric layer and the second nonwoven fabric layer are not particularly limited, but the fineness should be about 2.0 to 5.0 dtex and the basis weight should be about 15 to 35 g/m 2 . is preferred.
  • the same nonwoven fabric or different nonwoven fabrics may be used as the first nonwoven fabric layer and the second nonwoven fabric layer.
  • the superabsorbent polymer particles contained in the superabsorbent polymer sheet 34 are preferably ones that have a large amount of absorption, specifically, those that have a water absorption rate of 60 to 80 seconds and an absorption amount of 50 to 70 g/g. .
  • the basis weight of the superabsorbent polymer particles can be determined as appropriate, but it is preferably about 50 to 200 g/m 2 .
  • the first nonwoven fabric layer and the second nonwoven fabric layer have been explained, but the first nonwoven fabric layer (the same applies to the second nonwoven fabric layer) may be one layer, or may be two or more layers. There may be multiple layers.
  • first sheet 31 and the second sheet 32 may be a first paper layer or a second paper layer instead of the first nonwoven fabric layer or the second nonwoven fabric layer.
  • first sheet 31 and the second sheet 32 are changed from a nonwoven fabric layer to a paper layer, the contents of the superabsorbent polymer particles (water absorption rate, absorption amount, basis weight, etc.) are the same as those described for the nonwoven fabric layer above. It can be the content.
  • the superabsorbent polymer sheet 34 inside the groove 40 absorbs the urine UR and expands.
  • the absorbent body adjacent to the groove 40 absorbs the urine UR and expands.
  • Each absorber 23A, 23B expands in the thickness direction TD as well as in the width direction WD) and tries to enter the inside of the groove 40 mainly by expanding in the width direction WD.
  • the absorbent portion 33 of the superabsorbent polymer sheet 34 absorbs urine UR and expands. Prevent intrusion into 40.
  • the packaging sheet 26A on the front side US and the superabsorbent polymer sheet 34 are in a state of being adhered to the packaging sheet 26B on the back side DS.
  • the adhesive part 36 gets wet with urine and gradually becomes unattached, as shown in (5-2) in FIG. It separates from the packaging sheet 26B of the DS and floats to the front side US (moves to the front side US).
  • both ends of the superabsorbent polymer sheet 34 in the width direction WD are sandwiched between the upper layer absorbent core 23A and the lower layer absorbent core 23B.
  • the absorbent portion 33 of the superabsorbent polymer sheet 34 that has expanded by absorbing urine UR is located between the upper absorbent layer 23A and the lower absorbent layer 23B (the area where both ends of the superabsorbent polymer sheet 34 in the width direction WD are located). It floats up to.
  • the adhesive state between the front US packaging sheet 26A and the superabsorbent polymer sheet 34 is maintained, but depending on the amount of urine, the front side
  • the adhesion between the US packaging sheet 26A and the superabsorbent polymer sheet 34 may also come off. Further, in the embodiment shown in FIG.
  • the superabsorbent polymer sheet 34 is positioned at a position in the thickness direction TD where it overlaps with the upper layer absorbent body 23A, and the superabsorbent polymer sheet 34 is positioned at a position in the thickness direction TD where it overlaps with the lower layer absorbent body 23B. It is preferable to let Since the absorbent portion 33 of the superabsorbent polymer sheet 34 rises due to urination, the position of the superabsorbent polymer sheet 34 in the thickness direction TD changes depending on the degree to which it rises.
  • the end of the superabsorbent polymer sheet 34 in the width direction WD is sandwiched between the upper absorbent layer 23A and the lower absorbent layer 23B. is valid.
  • the absorbent body 23 has a two-layer structure, but when the absorbent body 23 has a single layer, the width direction WD end of the superabsorbent polymer sheet 34 is connected to the back surface of the absorbent body 23. It is preferable to sandwich it between the packaging sheets 26B on the back side DS. When the absorbent body 23 is made into one layer, the width direction WD end portion of the superabsorbent polymer sheet 34 may be sandwiched between the surface of the absorbent body 23 and the front US packaging sheet 26A.
  • the layer structure of the absorbent body 23 is three or more layers
  • the absorbent part 33 of the superabsorbent polymer sheet 34 absorbs urine
  • the expanded absorbent part 33 spreads in the thickness direction TD of the entire absorbent body 23.
  • the structure of the absorbent body 23 is arranged in order from the front side US to the back side DS: the first layer (the absorbent body 23 located on the front side US), the second layer (the absorbent body 23 located in the middle), and the third layer (the absorbent body 23 located in the middle).
  • the absorbent body 23 has a three-layer structure located at It is preferable to have a configuration in which the two are sandwiched.
  • the structure of the absorbent body 23 is arranged in order from the front side US to the back side DS: the first layer (the absorbent body 23 located on the front side US), the second layer (the absorbent body 23 located in the middle), and the third layer (the absorbent body 23 located in the middle).
  • the first layer the absorbent body 23 located on the front side US
  • the second layer the absorbent body 23 located in the middle
  • the third layer the absorbent body 23 located in the middle
  • the first layer the absorbent body 23 located on the front side US
  • the second layer the absorbent body 23 located in the middle
  • the third layer the absorbent body 23 located in the middle
  • a superabsorbent polymer sheet 34 is required.
  • the width direction WD end of the superabsorbent polymer sheet 34 may be sandwiched between the first layer and the second layer or between the third layer and the fourth layer. Most preferably, it is sandwiched between the second layer and the third layer.
  • a similar concept may be used when the absorber 23 has five or more layers.
  • the above description has been made for the case where there is not much difference in the thickness of each layer of the absorber 23 when the absorber 23 has multiple layers.
  • the thickness of each layer of the absorber 23 is different, Accordingly, it is preferable to change the positions at which the ends of the superabsorbent polymer sheet 34 in the width direction WD are sandwiched.
  • the structure of the absorbent body 23 is a three-layer structure, and the thickness is the sum of the thickness of the first layer (the absorbent body 23 located on the front side US) and the thickness of the second layer (the absorbent body 23 located in the middle).
  • the thickness is approximately the same as the thickness of the third layer (absorbent body 23 located on the back side DS)
  • the width direction WD end of the superabsorbent polymer sheet 34 is sandwiched between the second layer and the third layer. It is preferable.
  • the structure of the absorbent body 23 is a four-layer structure, and the thickness of the first layer (the absorbent body 23 located on the front side US) is the thickness of the second layer (the absorbent body 23 located in the middle).
  • the superabsorbent polymer sheet 34 It is preferable that the width direction WD end portion of is sandwiched between the first layer and the second layer.
  • the absorbent portion 33 will float to the front side US after the adhesive is peeled off, but the position up to which it will float was set. Specifically, as shown in (5-1) of FIG. 5, the absorbent portion 33 that has expanded to a position where the widthwise WD ends of the superabsorbent polymer sheet 34 are sandwiched is lifted up.
  • the thickness 33T of the absorbent portion 33 of the superabsorbent polymer sheet 34 can be determined as appropriate.
  • the thickness 33T (length in the thickness direction TD; the same applies hereinafter) of the absorbent portion 33 of the superabsorbent polymer sheet 34 is 0.5 to 0.5. It is preferably about 5 mm, more preferably about 1 to 3 mm.
  • the absorbent portion 33 of the superabsorbent polymer sheet 34 near the urinary opening drains urine.
  • the thickness 33T of the absorbent portion 33 of the superabsorbent polymer sheet 34 may be approximately 5 to 30 mm. Preferably, it is more preferably about 7 to 15 mm.
  • the thickness of the absorption part 33 of the superabsorbent polymer sheet 34 is 33T. is preferably about 5 to 40 mm, more preferably about 10 to 30 mm.
  • the superabsorbent polymer sheet 34 that has expanded by absorbing urine is designed to prevent the absorbent core 23 (upper layer absorbent core 23A and lower layer absorbent core 23B) that has expanded by absorbing urine from entering the inside of the groove 40. It plays the role of a barrier. Therefore, it is preferable that the absorbent portions 33 of the superabsorbent polymer sheet 34 expand in the thickness direction TD to an extent that can block the upper layer absorbent core 23A and the lower layer absorbent core 23B from entering into the grooves 40.
  • the absorbent part 33 of the superabsorbent polymer sheet 34 expands too much in the thickness direction TD, there is a risk that the internal space of the groove 40 will be filled with the expanded absorbent part 33 of the superabsorbent polymer sheet 34. be. Therefore, it is preferable to prevent the absorbent portion 33 of the superabsorbent polymer sheet 34 from expanding too much in the thickness direction TD.
  • the groove 40 remains on the front side US of the absorbent part 33 of the superabsorbent polymer sheet 34, and the back side of the absorbent part 33 of the superabsorbent polymer sheet 34 and the packaging Preferably, spaces are formed between the sheets 26B.
  • the thickness 40T (the length in the thickness direction TD; the same applies hereinafter) of the groove 40 in the product state is taken as 100%, the absorption of the superabsorbent polymer sheet 34 during urination once or twice
  • the thickness 33T of the portion 33 is about 25 to 70% (adjust the content and type of superabsorbent polymer. The same applies hereinafter), and it is preferable to design the thickness 33T of the portion 33 to be about 25 to 70%.
  • the thickness 33T of the absorbent portion 33 of the polymer sheet 34 to be approximately 37.5 to 95%.
  • the length 33W of the absorbent portion 33 of the superabsorbent polymer sheet 34 in the width direction WD can also be determined as appropriate.
  • the length 33W in the width direction WD of the absorbent portion 33 of the superabsorbent polymer sheet 34 can be approximately 2.5 to 28.8 mm. Preferably, it is more preferably about 3.5 to 28.8 mm.
  • the width 40W of the groove 40 is preferably about 5 to 32 mm in the case of an absorbent article for adults.
  • the width 40W of the groove 40 when the width 40W of the groove 40 is taken as 100%, it is preferable that the length 33W in the width direction WD of the absorbing portion 33 disposed inside the groove 40 is set to 50 to 90%, and 70 to 90%. % is more preferable.
  • the absorbent body 23 and the absorbent portion 33 of the superabsorbent polymer sheet 34 absorb urine UR, they expand not only in the thickness direction TD but also in the width direction WD. If the length 33W of the WD is longer than 90%, the absorbent portion 33 that has expanded by absorbing the urine UR may get caught on the adjacent expanded absorbent body 23 and may not float up to the desired position on the front side US.
  • the width of the absorbent part 33 disposed inside the groove 40 is shorter than 50%, the width of the absorbent part 33 is too short and the adjacent absorbent body 23 will absorb urine. When it expands, it tends to enter the inside of the groove 40, and as a result, there is a possibility that the groove 40 will almost disappear.
  • the superabsorbent polymer sheet 34 can be formed to extend in the front-rear direction of the absorbent article.
  • the second to fourth embodiments shown in Figs. It may also be provided intermittently along the direction LD.
  • the absorbent portions 33 of the superabsorbent polymer sheet 34 are provided intermittently in the front-rear direction of the groove 40, a portion (gap 35) where the absorbent portion 33 does not exist is created in a part of the groove 40. .
  • the urine UR passes through the gap 35 and diffuses to the back side DS (lower side) of the expanded absorbent part 33, so the diffusion speed of the urine UR can be increased. can do.
  • the distance 33M between the centers of the absorbent parts 33, 33 adjacent to each other in the front-rear direction LD is preferably about 30 to 100 mm, and preferably about 50 to 70 mm. It is more preferable to do so.
  • the distance 33N between the front and rear LD edges of the absorbent parts 33, 33 adjacent in the front and rear direction LD is preferably about 5 to 20 mm, and is preferably about 5 to 10 mm. It is more preferable to set it as a degree.
  • the absorbent body 23 that has expanded by absorbing the urine UR will absorb the urine UR and expand inside the groove 40. There is a high possibility that the urine will enter the gap 35, and as a result, it becomes difficult to achieve the effect of increasing the diffusion speed of the urine UR.
  • the distance between the adjacent absorbent parts 33, 33 in the front-rear direction LD is made too short, the distance between the adjacent absorbent parts 33, 33 is The gap 35 becomes smaller, making it difficult to achieve the aforementioned effect of increasing the diffusion speed of urine UR.
  • the distances 33M and 33N between the plurality of absorbing portions 33 provided in the groove 40 are the same in other forms such as the third embodiment.
  • a portion of the superabsorbent polymer sheet 34 with superabsorbent polymer particles is placed adjacent to the outside of the groove 40 in the width direction. It can also be provided in the section. At this time, it is preferable that the absorbent portions 33 provided in the adjacent portions be provided at positions that bridge the rear end portion and the front end portion of the absorbent portions 33 that are intermittently provided in the groove 40 .
  • the width 41W of the adjacent portion 41 can be determined arbitrarily, but it is preferably about 30 to 100%, and about 50 to 100%, when the width 40W of the groove 40 is taken as 100%. It is more preferable. Note that, as described above, the width 40W of the groove 40 is preferably about 1.5 to 32 mm in the case of an absorbent article for adults. Therefore, the width 41W of the adjacent portion 41 is preferably about 5 to 32 mm, more preferably about 2.5 to 32 mm.
  • the length 41L of the adjacent portion 41 in the front-rear direction LD can be determined arbitrarily, but it should be approximately 100 to 150% when the length 40L of the groove 40 in the front-rear direction LD is taken as 100%. is preferable, and more preferably about 120 to 150%.
  • the length 40L of the groove 40 in the front-rear direction LD is preferably about 100 to 300 mm in the case of an absorbent article for adults. Therefore, the length 41L of the adjacent portion 41 in the front-rear direction LD is preferably about 100 to 450 mm, more preferably about 120 to 450 mm.
  • an absorbent part 33 is also arranged in the adjacent part 41 on the outside of the groove 40 in the width direction WD (the absorbent part 33 arranged in the adjacent part 41 is also particularly referred to as "adjacent absorbent part 33B").
  • the adjacent absorbent part 33B arranged in the adjacent part 41 expands, the part (gap 35) where the absorbent part 33 does not exist inside the groove 40 is expanded into the expanded absorbent part 33 arranged in the groove 40 (groove 40).
  • the arranged absorbent part 33 is especially referred to as the "in-groove absorbent part 33A") and the adjacent absorbent part 33B, so that the absorbent bodies 23A, 23B expanded into the gap 35 inside the groove 40 can be prevented from entering.
  • the urine UR passes through the gap 35 and diffuses to the back side DS (lower side) of the expanded grooved absorption part 33A, so the diffusion speed of the urine UR can be increased. .
  • the width 33AW of the grooved absorbent portion 33A is narrower than the width 40W of the groove 40;
  • the groove absorbent portion 33A absorbs the urine UR and expands in the width direction WD, so the width 33AW of the groove absorbent portion 33A is the same as the groove 40. It can be seen that the width is about the same as the width of 40W.
  • the length 33X of the overlapping portion in the front-rear direction LD between the adjacent absorbent portion 33B and the in-groove absorbent portion 33A can be arbitrarily determined, it is preferably 5 mm or more, and more preferably 10 mm or more. If the length 33X of the overlapping portion is shorter than 5 mm, there is a risk that when the adjacent absorbent portion 33B absorbs urine, it expands in the width direction WD and invades the groove 40, and if such invasion occurs, , the gap 35 within the groove 40 may become narrower.
  • the absorbing portion 33R on the right side of the groove 40 is provided at a position bridging the rear end and front end of the absorbing portion 33L intermittently provided on the left side of the groove 40. be able to.
  • the absorbing portion 33L on the left side of the groove 40 may be provided at a position bridging the rear end and front end of the absorbing portion 33R provided intermittently on the right side of the groove 40. good.
  • a portion (gap 35) where the absorbing portion 33 does not exist is created in a portion of the left side and right side of the groove 40. Therefore, when urinating multiple times, the urine UR passes through the gap 35 and easily diffuses to the back side DS (lower side) of the expanded absorbent parts 33L and 33R, so that the diffusion speed of the urine UR can be increased. can.
  • the length 33Y of the overlapping portion of the left side absorbent body 33L and the right side absorbent body 33R in the front-rear direction LD can be determined arbitrarily, but it is preferably about 5 to 30 mm, and about 10 to 15 mm. It is more preferable to do so. If the length 33Y of the overlapping portion is shorter than 5 mm, the absorber 33L on the left side expands in the width direction WD (especially in the right direction) when it absorbs urine, and as a result, the gap 35 on the right side may become narrower. . Similarly, when the absorber 33R on the right side absorbs urine, it expands in the width direction WD (particularly in the left direction), and as a result, the gap 35 on the left side may become narrower.
  • the length 33Y of the overlapping portion is longer than 30 mm, the distance between the absorbers 33L, 33L adjacent to each other in the front-rear direction in the left side portion becomes shorter, so there is a possibility that the gap 35 in the left side portion becomes narrower. The same can be said for the right side portion.
  • the absorbent portion 33L is arranged on the left side and the absorbent portion 33L is placed on the right side with respect to the virtual reference line L1 passing through the center of the width 40W of the groove 40 and extending in the front-rear direction LD.
  • the portion 33R is arranged, the arrangement is not limited to this manner.
  • This reference line L1 may be placed on the left side LS or on the right side RS of FIG. 9.
  • the area of the absorbing portion 33L on the left side is approximately the same as the area of the absorbing portion 33R on the right side, but the area of each absorbing portion 33L, 33R is It may have a different area.
  • the absorbing portion 33R on the right side It is preferable to make the area of the absorbent portion 33L larger than the area of the absorbing portion 33L on the left side. If the width of the absorbent part 33 (the sum of 33L and 33R) disposed inside the groove 40 becomes too narrow relative to the width 40W of the groove 40, the absorbent body 23 that has expanded by absorbing urine will become depressed. This is because it becomes difficult to prevent it from entering the groove 40. For the same reason, when the reference line L1 is placed on the right side, it is preferable that the area of the absorbing portion 33L on the left side be larger than the area of the absorbing portion 33R on the right side.
  • the MD direction in the product is the direction of fiber orientation of the nonwoven fabric.
  • Fiber orientation is the direction along which the fibers of a nonwoven fabric follow. This can be determined by a simple measurement method that determines the orientation direction.
  • the front-rear direction is the MD direction
  • the width direction is the CD direction.
  • Unfolded state means a state in which it is flattened without shrinkage or slack.
  • Elongation rate means a value when the natural length is 100%. ⁇ “Basic weight” is measured as follows.
  • pre-drying refers to making the sample or test piece constant weight in an environment at a temperature of 100°C. Note that fibers with an official moisture content of 0.0% do not need to be pre-dried.
  • a sample sampling template 100 mm x 100 mm
  • Measure the weight of the sample multiply by 10 to calculate the weight per square meter, and use it as the basis weight.
  • the "thickness" of the top sheet means the "apparent thickness” and is measured by the following method. That is, for measurement, a measurement piece measuring 30 mm in length x 30 mm in width is cut out. At this time, create a cut plane that passes through the measurement area. For example, when measuring the apparent thickness of a portion of the top sheet excluding the periphery of the through hole, a cut surface that is parallel to the MD direction and does not pass through the through hole and its periphery is formed. Then, an enlarged photograph of this cut surface is taken using a digital microscope VHX-1000 manufactured by Keyence Corporation, etc., and the apparent thickness of the target portion of the top sheet is measured based on this enlarged photograph.
  • the "thickness" of the absorber can be measured using a thickness measuring device manufactured by Ozaki Seisakusho Co., Ltd. (Peacock, dial thickness gauge large type, model J-B (measuring range 0 to 35 mm) or model K-4 (measuring range 0 to 50 mm)) Measure with the sample and thickness measuring device horizontal.
  • - "Thickness” other than the above is automatically measured using an automatic thickness measuring device (KES-G5 Handy Compression Measurement Program) under the conditions of load: 0.098 N/cm 2 and pressurized area: 2 cm 2 .
  • ⁇ Water absorption rate is the "time to end point" when JIS K7224-1996 "Water absorption rate test method for super absorbent resin” is performed using 2 g of super absorbent polymer and 50 g of physiological saline. .
  • Artificial urine contains urea: 2wt%, sodium chloride: 0.8wt%, calcium chloride dihydrate: 0.03wt%, magnesium sulfate heptahydrate: 0.08wt%, and ion exchange water: 97%. It is a mixture of .09 wt% and is used at a temperature of 40 degrees unless otherwise specified.
  • test or measurement shall be conducted in a test room or equipment under standard conditions (test location: temperature 23 ⁇ 1°C, relative humidity 50 ⁇ 2%). do. - Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state.
  • the present invention can be used in any form, such as pad type disposable diapers such as the above example, tape type disposable diapers, pants type disposable diapers, etc., and can also be used in absorbent articles other than disposable diapers, such as sanitary napkins. It is available.
  • Pad type disposable diaper B2... Back side part, C2... Crotch area, F2... Front part, LD...Anteroposterior direction, FS...Front side, BS...Back side, TD...Thickness direction, US...Front side, DS...Back side, WD...Width direction, LS...Left side, RS...Right side, UR...Urine

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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)
PCT/JP2022/040479 2022-03-25 2022-10-28 吸収性物品 Ceased WO2023181483A1 (ja)

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