WO2013046702A1 - Disposable wearing article - Google Patents

Disposable wearing article Download PDF

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Publication number
WO2013046702A1
WO2013046702A1 PCT/JP2012/006207 JP2012006207W WO2013046702A1 WO 2013046702 A1 WO2013046702 A1 WO 2013046702A1 JP 2012006207 W JP2012006207 W JP 2012006207W WO 2013046702 A1 WO2013046702 A1 WO 2013046702A1
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WO
WIPO (PCT)
Prior art keywords
sheet
liquid absorbent
water
liquid
elastics
Prior art date
Application number
PCT/JP2012/006207
Other languages
English (en)
French (fr)
Inventor
Kenichi Sasayama
Makoto Ichikawa
Kunihiko Katsuragawa
Original Assignee
Unicharm Corporation
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 Unicharm Corporation filed Critical Unicharm Corporation
Publication of WO2013046702A1 publication Critical patent/WO2013046702A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49001—Absorbent articles specially adapted to be worn around the waist, e.g. diapers having preferential bending zones, e.g. fold lines or grooves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49017—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means being located at the crotch region
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A61F13/5323—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having absorbent material located in discrete regions, e.g. pockets
    • 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
    • A61F2013/530481—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 superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/53051—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 superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
    • A61F2013/530547—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 superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged positioned in a separate layer or layers
    • A61F2013/530554—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 superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged positioned in a separate layer or layers and being fixed to a web

Definitions

  • the present disclosure relates to disposable wearing articles, more specifically, relates to disposable wearing articles such as disposable diapers, disposable toilet training pants, disposable incontinent pants, disposable sanitary pants, disposable absorbent pads, or the like.
  • Disposable wearing articles which are provided with a relatively thin liquid absorbent structure are known.
  • a liquid absorbent structure which does not contain pulp fibers but contains water-superabsorbent polymer particles between two pieces of nonwoven fabric sheets is disclosed.
  • the wearing article disclosed in PTL 1 since the liquid absorbent region to absorb and retain body fluid is formed of only water-superabsorbent polymer particles, the wearing article may be relatively thin. Moreover, the water-superabsorbent polymer particles are securely retained between two sheets of nonwoven fabrics by the intermediary of adhesives applied therebetween in a steric net-like fashion. Compared to when adhesives are planarly applied over the entirety of the opposed surfaces of the sheets, the liquid absorbent structure is unlikely to lose the water absorbing performance.
  • the inventor(s) have recognized that when the liquid absorbent region is formed of only water-superabsorbent polymer particles as described above, the body fluid diffusibility thereof is relatively low compared to when pulp fibers are contained therein, and the body fluid is likely to remain on a portion of the skin facing side of the liquid absorbent structure where the water-absorbent polymer particles have been already swollen upon absorbing body fluid for a while after excretion, potentially creating a feeling of discomfort against the wearer and/or causing skin irritations.
  • Some embodiments of the present invention provide a disposable wearing article having a longitudinal direction and a lateral direction and including a liquid absorbent structure extending in the longitudinal direction.
  • the liquid absorbent structure includes a liquid permeable body side liner and a liquid absorbent layer.
  • the liquid absorbent layer includes a liquid permeable first sheet, a liquid permeable or liquid impermeable second sheet, and water-superabsorbent polymer particles disposed between the first and second sheets and secured on an inner side of the first sheet.
  • a plurality of elastics extending in the longitudinal direction is disposed between the body side liner and the first sheet in a stretched state at least in a midsection of the liquid absorbent layer.
  • the body side liner and the first sheet are joined via a plurality of joining portions extending in the longitudinal direction and being spaced apart from one another at predetermined intervals in the lateral direction.
  • the body side liner and the first sheet have a plurality of ridges and grooves extending in the lateral direction and formed by contraction of the elastics so that a body fluid retaining portion is defined between the first sheet and the second sheet.
  • FIG.1 is a perspective view of a disposable diaper as one example of disposable wearing articles according to at least one embodiment of the present invention.
  • FIG.2 is a partially cutaway perspective view of the disposable diaper similar to FIG.1.
  • FIG.3 is a partially cutaway developed plan view of the diaper as seen from an inner side (skin-facing side) thereof after side seams are peeled off and the diaper is extended in the longitudinal direction.
  • FIG.4 is an exploded perspective view of the diaper.
  • FIG.5 is a plan view of a base sheet.
  • FIG.6 is a plan view of a liquid absorbent structure.
  • FIG.7 is a plan view of a liquid absorbent layer illustrating an application pattern of a hot melt adhesive of joining portions, without a body side liner.
  • FIG.8 is a partially cutaway plan view of the liquid absorbent layer.
  • FIG.9 is a schematic cross section view along IX-IX line of FIG.2.
  • FIG.10 is a schematic cross section view similar to FIG.9 after body fluid is absorbed.
  • FIG.11 is a plan view of a liquid absorbent structure in another embodiment.
  • a disposable diaper 10 as one example of disposable wearing articles in accordance with embodiments of the present invention has a longitudinal direction Y and a lateral direction X orthogonal thereto.
  • the diaper 10 includes a chassis 14 and a liquid absorbent structure 15.
  • the chassis 14 includes a front waist region 11, a rear waist region 12 and a crotch region 13 extending in the longitudinal direction Y between the front and rear waist regions 11, 12.
  • the liquid absorbent structure 15 is attached on a skin facing side of at least the crotch region 13.
  • a plurality of ridges and grooves 26 are formed on the skin facing side of the liquid absorbent structure 15.
  • the chassis 14 further includes a skin facing side and a non-skin facing side opposite thereto, annular elastic waist panel 16 extending in a waist circumferential direction, and a crotch panel 17 attached on the non-skin facing side of the elastic waist panel 16.
  • the elastic waist panel 16 includes a front waist panel 18 defining the front waist region 11 and a rear waist panel 19 defining the rear waist region 12.
  • the front waist panel 18 includes an inner end edge 18a intersecting with the crotch panel 17 and extending in the lateral direction X and an outer end edge 18b spaced apart from and opposed to the inner end edge 18a in the longitudinal direction Y and extending in the lateral direction X, and lateral edges 18c, 18d extending in the longitudinal direction Y between the inner and outer end edges 18a, 18b.
  • the rear waist panel 19 is configured to be: substantively the same in shape and size as the front waist panel 16; intersecting with the crotch panel 17; and formed in a laterally long rectangle shape contoured by an inner end edge 19a extending in the lateral direction X, an outer end edge 19b spaced apart from and opposed to the inner end edge 19a in the longitudinal direction Y and extending in the lateral direction X, and lateral edges 19c, 19d extending in the longitudinal direction Y between the inner and outer end edges 19a, 19b.
  • the lateral edges 18c, 18d of the front waist panel 18 and the lateral edges 19c, 19d of the rear waist panel 19 are overlapped with each other and connected by side seams 20 continually arranged in the longitudinal direction Y, and thereby a waist opening 21 and a pair of leg openings 22 are defined (refer to FIG.1).
  • the side seams 20 are formed by, for example, a variety of thermal bonding techniques such as heat embossing process, sonic process, or the like.
  • the front waist panel 18 includes a first inner sheet 23 lying on the skin facing side and a first outer sheet 24 lying on the non-skin facing side.
  • the first inner and outer sheets 23, 24 are formed of at least one of a liquid impermeable SMS (spunbond/melt blown/spunbond) nonwoven fabric, a spunbond nonwoven fabric, a plastic sheet each having a mass per unit area of about 15 to about 30 g/m 2 or a laminate thereof.
  • the sheets 23, 24 are joined to each other with a hot melt adhesive intermittently applied on at least one of the inner sides (facing sides) of the sheets or by the thermal bonding techniques.
  • a plurality of thread, strand or string front waist elastics 25 extending in the lateral direction X is provided between the sheets 23, 24.
  • the front waist panel 18 is stretchable at least in the lateral direction X due to the front waist elastics 25 provided thereon.
  • the sheets 23, 24 may be joined to each other only with a hot melt adhesive applied on substantively the entire peripheries of the front waist elastics 25.
  • the front waist elastics 25 include front upper waist elastics 25A extending in the lateral direction X along the outer end edge 18b of the front waist panel 18 and front lower waist elastics 25B extending in the lateral direction X along the inner end edge 18a.
  • the rear waist panel 19 includes a second inner sheet 28 lying on the skin facing side and a second outer sheet 29 lying on the non-skin facing side.
  • the second inner and outer sheets 28, 29 are formed of at least one of a liquid impermeable SMS (spunbond/melt blown/spunbond) nonwoven fabric, a spunbond nonwoven fabric, a plastic sheet each having a mass per unit area of about 15 to about 30 g/m 2 , or a laminate thereof.
  • the sheets 28, 29 are joined with a hot melt adhesive applied on at least one of the inner sides (facing sides) thereof or by the thermal bonding techniques.
  • the rear waist elastics 30 including a plurality of thread, strand or string elastics extending in the lateral direction X are provided between the sheets 28, 29.
  • the rear waist panel 17 is stretchable at least in the lateral direction X due to the rear waist elastics 30 provided thereon.
  • the sheets 28, 29 may be joined to each other only with a hot melt adhesive applied on substantively the entire peripheries of respective elastics of the rear waist elastics 30.
  • the rear waist elastics 30 include rear upper waist elastics 30A extending in the lateral direction X along the outer end edge 19b of the rear waist panel 19 and rear lower waist elastics 30B extending in the lateral direction X along the inner end edge 19a.
  • the crotch panel 17 is in a substantively longitudinally long rectangle shape, and includes a front end portion 17A attached on the non-skin facing side (outer side) of the front waist panel 18, a rear end portion 17B attached on the non-skin facing side of the rear waist panel 19, and an intermediate portion 17C extending in the longitudinal direction Y between the front and rear end portions 17A, 17B.
  • the crotch panel 17 includes a base sheet 34 and a liquid absorbent structure 15 disposed on the skin facing side (inner side) of the base sheet 34.
  • the liquid absorbent structure 15 includes a liquid absorbent layer 35 and a body side liner 36 formed of a liquid permeable sheet to cover at least the skin facing side of the liquid absorbent layer 35.
  • a plurality of thread, string or strand elastics 37 extending in the longitudinal direction Y is provided as described below, and a plurality of ridges and grooves 26 (or gathers) extending in the lateral direction X is formed on the skin facing side of the liquid absorbent structure 15 by contraction of the elastics 37 (refer to FIG.2).
  • the ridges and grooves 26 include ridges 27a and grooves 27b being alternately arranged in the longitudinal direction Y.
  • the diaper 10 may include the chassis 14 in which the regions are configured by a continuous sheet.
  • the liquid absorbent structure 15 may be disposed between the liquid permeable top sheet lying on the skin facing side and the liquid impermeable back sheet lying on the non-skin facing side defining the chassis 14.
  • the disposable wearing article in some embodiments of the present invention may also be configured as an open type disposable diaper in which lateral portions of the front and rear waist regions are connected with tape fasteners, or as a disposable absorbent pad extending in the front and rear waist regions in a rectangle shape. This is because one or more of the effects to be described below may be exerted as long as the disposable wearing article includes the liquid absorbent structure 15.
  • the base sheet 34 includes inner and outer crotch sheets 38, 39 formed of a liquid impermeable nonwoven fabric sheet and/or a plastic film.
  • the inner and outer crotch sheets 38, 39 are joined to each other with a hot melt adhesive (not illustrated) applied on an inner side (i.e., the side facing the other sheet 38 or 39) of one of the sheets 38, 39, and the lateral portions thereof are inwardly folded to form a pair of lateral elastic portions 40 extending in the longitudinal direction Y and having a gasket function.
  • the respective lateral elastic portions 40 are provided with a plurality of thread, strand or string first and second leg elastics 41, 42 extending in the longitudinal direction Y to elasticize the portions 40 at least in the longitudinal direction Y.
  • the first leg elastics 41 extend straight in the longitudinal direction Y along inner edges of the lateral elastic portions 40, and the second leg elastics 42 inwardly curve in the central region of the crotch region 13 and extend toward the front and rear waist regions 11, 12 in a curved line.
  • the first and second leg elastics 41, 42 are bonded in a stretched state in the longitudinal direction between the sheets 38, 39 with a hot melt adhesive (not illustrated) applied on one of opposed surfaces of the inner and outer crotch sheets 38, 39.
  • the crotch panel 17 is attached on the outer side of the front and rear waist panels 18, 19 in a front bonding region 45 and a rear bonding region 46 defined by a hot melt adhesive applied thereto on the skin facing side of a front end portion 17A and a rear end portion 17B.
  • the front and rear bonding regions 45, 46 each include a square U-shape portion opening toward the crotch region 13 and defining a non-bonding region 50 in which no hot melt adhesive is applied.
  • the cover sheets 51, 52 are attached in the front and rear end portions 17A, 17B of the crotch panel 17 so as to cover them. More specifically, the cover sheets 51, 52 are formed of, for example, a nonwoven fabric and/or a plastic sheet each having a mass per unit area of about 10 to about 30 g/m 2 , and bonded on the non-skin facing side of the front and rear waist panels 18, 19 with a hot melt adhesive (not illustrated) so as to intersect with the front and rear end portions 17A, 17B of the crotch panel 17.
  • the cover sheets 51, 52 since the front and rear end portions 17A, 17B of the crotch panel 17 are covered with the cover sheets 51, 52, when the wearer or a caregiver to the wearer holds and pulls up the front and rear waist panels 18, 19 with one's fingers to put on the diaper 10, one's fingers is unlikely to be caught by the front and rear end portions 17A, 17B. Moreover, a stiffness of regions covered by the cover sheets 51, 52 may increase, thereby it is possible to stably pull up the regions with one's fingers without breaking any portion of the diaper.
  • FIG.5 is a plan view of the base sheet 34, illustrating the outer shape of the liquid absorbent structure 15 in an imaginary line.
  • the liquid absorbent structure 15 includes a front end portion 15a extending in the lateral direction X on the front waist region 11 side, a rear end portion 15b extending in the lateral direction X on the rear waist region 12 side, and lateral edge portions 15c, 15d extending in the longitudinal direction Y between the front and rear end portions 15a, 15b.
  • the bonding region 54 in which a hot melt adhesive is applied on the skin facing side thereof is formed to secure the liquid absorbent structure 15 to the chassis 14.
  • the bonding region 54 is slightly positioned inward from the outer circumference of the liquid absorbent structure 15 in this particular embodiment, the outer shape thereof may be configured to be large enough to substantively come into contact with the outer peripheries of the liquid absorbent structure 15 so as to secure the liquid absorbent structure 15 more stably.
  • the bonding region 54 may be configured to be continuous and also may be partially separated.
  • the elastics 37 are spaced apart at predetermined intervals in the lateral direction X. More specifically, a distance R (i.e., pitch or center-to-center distance of the elastics 37) between adjacent elastics 37 in the lateral direction X is about 5 to about 40 mm, preferably about 10 to about 25 mm.
  • the elastics 37 are attached on the inner side (i.e., the side facing the liquid absorbent layer 35) of the body side liner 36 while being stretched by about 1.1 to about 2.4 times, preferably by about 1.2 to about 1.8 times their original length in the longitudinal direction Y.
  • the elastics 37 may intersect with one another as long as ridges and grooves 26 are formed in the liquid absorbent structure 15, and/or may be attached in a straight or curved line in the lateral direction X and/or the longitudinal direction Y depending on the distance R, an application pattern of the hot melt adhesive, or other condition.
  • the body side liner 36 is a liquid permeable nonwoven fabric sheet having a mass per unit area of about 15 to about 35 g/m 2 and preferably hydrophilized. It may be formed of various nonwoven fabrics such as spunbond nonwoven fabrics, point bonded nonwoven fabrics, air through nonwoven fabrics, or the like.
  • the body side liner 36 is joined to the liquid absorbent layer 35 (first sheet 61 to be described below) by the intermediary of joining portions 59 in which the hot melt adhesive is continuously applied in a spiral pattern in the longitudinal direction Y.
  • the joining portions 59 are formed in substantively the entire region of the first sheet 61 of the liquid absorbent layer 35.
  • the elastics 37 are provided between the joining portions 59 adjacent to one another in the lateral direction X.
  • the elastics 37 are bonded at least to the liquid absorbent layer 35 with a hot melt adhesive (not illustrated) applied substantively on the peripheries of the elastics 37.
  • the elastics 37 are also bonded to the body side liner 36.
  • the contracting force of the elastics 37 is exerted in spacing portions between respective columns of the joining portions 59 in the lateral direction X and in spacing portions defined in each circle of the spiral pattern of joining portions 59 in the longitudinal direction Y so as to form a plurality of gathers extending in the lateral direction X, thereby forming the ridges and grooves 26 in the liquid absorbent structure 15. Therefore, the ridges 27a and grooves 27b of the ridges and grooves 26 are formed intermittently and irregularly.
  • a distance R2 i.e., an edge-to-edge distance
  • a width or diameter R3 of each circle of the spiral pattern of joining portions 59 be about 3 to about 25 mm.
  • the liquid absorbent layer 35 includes: absorbent materials primarily formed of water-superabsorbent polymer particles 60 being water-insoluble and having a water absorbing performance of 10 times or more of their own mass; a first sheet formed of a liquid permeable nonwoven fabric having a mass per unit area of about 8.0 to about 15.0 g/m 2 , preferably of about 10.0 g/m 2 lying on the skin facing side; and a second sheet 62 formed of a liquid permeable, hardly-liquid permeable, or liquid impermeable SMS nonwoven fabric having a mass per unit area of about 8.0 to about 15.0 g/m 2 , preferably of 11.0 g/m 2 lying on the non-skin facing side.
  • the liquid absorbent layer 35 further includes a plurality of liquid absorbent regions 63 in which the absorbent materials are disposed and sealing regions 64 in which the absorbent materials are not substantively disposed.
  • the liquid absorbent regions 63 are defined in a substantively rectangle shape and being spaced apart at predetermined intervals in the longitudinal direction Y.
  • the liquid absorbent regions 63 are surrounded by the sealing regions 64, in which the first sheet 61 and the second sheet 62 are bonded together. While the eight divided liquid absorbent regions 63 are described in this particular embodiment, it is possible to change the area and/or the number of regions based on the absorbing performance required by the liquid absorbent layer 35.
  • the liquid absorbent regions 63 may be in eight or more regions or may be in a single region extending over the entire region of the liquid absorbent layer 35.
  • the sealing regions 64 are continuous to each other. In further configurations, some sealing regions 64 are separated from each other.
  • water-superabsorbent polymer particles 60 having a mass per unit area of about 30 to about 300 g/m 2 , preferably of about 40 to about 280 g/m 2 are substantively uniformly bonded at least on the inner side (i.e., the side facing the second sheet 62) of the first sheet 61 with a hot melt adhesive 66.
  • the water-superabsorbent polymer particles 60 are also bonded on the inner side (i.e., the side facing the first sheet 61) of the second sheet 62.
  • the absorbent layer 35 When the mass per unit area of the water-superabsorbent polymer particles 60 is smaller than 30 g/m 2 , the absorbent layer 35 has poor absorbent performance, and it may not sufficiently absorb body fluid. In contrast, when the mass per unit area is greater than 300 g/m 2 , in the liquid absorbent layer 35, the water-superabsorbent polymer particles 60 being not bonded on the inner side of the first sheet 61 might be present in the liquid retaining portion 65 to be described below so as to potentially lower the absorbing speed of the liquid absorbent layer 35. In addition, the distribution of the water-superabsorbent polymer particles 60 might be biased so as to deform the liquid absorbent layer 35.
  • the absorbent materials may contain not only the water-superabsorbent polymer particles 60 but also other materials such as fluff pulp, thermoplastic staple fibers or the like as option at a relatively low mixing rate. More specifically, in order to mix water-absorbent fibers such as fluff pulp or the like, it is preferred to be mixed at a rate of about 0 to about 30 % by mass in the overall absorbent material.
  • the hot melt adhesive 66 a variety of adhesives may be used. However, it is more preferred to use a hydrophobic adhesive such that the water-superabsorbent polymer particles 60 do not fall off the first sheet 61 before absorbing body fluid.
  • the first sheet 61 and second sheet 62 be partially bonded or be not bonded to each other.
  • the hot melt adhesive 66 in the liquid absorbent regions 63 it is possible that body fluid moved into the liquid absorbent layer 35 is absorbed by the water-superabsorbent polymer particles 60 so as to swell and loosen the partial bonding of the sheets 61, 62 bonded to each other.
  • the first and second sheets 61, 62 are joined to each other with the hot melt adhesive 66.
  • the hot melt adhesive 66 is relatively sparsely applied, while in the sealing regions 64, it is relatively densely applied.
  • the hot melt adhesive 66 is applied so as not to prevent the body fluid from permeating, while in the sealing regions 64, the hot melt adhesive 66 is applied densely so as not to easily loosen the bonding even when the liquid absorbent region 63 absorbs body fluid and swells.
  • the absorbent material of the liquid absorbent layer 35 contains water-superabsorbent polymer particles at a ratio of 70% by mass or greater. Therefore compared to an absorbent layer including a mixture of the water-superabsorbent polymer particles 60 and fluff pulp mixed substantively at the same ratio (i.e., 50% each), the entirety of the liquid absorbent layer 35 is thinner, and the liquid absorbent structure 15 is excellent in adapting to movement of the crotch panel 17. Additionally, since the first and second sheets 61, 62 are stably bonded in the sealing regions 64, they have a required peel strength as well as higher flexibility compared to when the entire inner sides of the first and second sheets 61, 62 are bonded together.
  • the sealing regions 64 can serve as sealing portions to seal the peripheries of the liquid absorbent regions 63 so as to prevent the movable water-superabsorbent polymer particles 60 from falling off the liquid absorbent region 63.
  • parts of the water-superabsorbent polymer particles 60 may be present in the sealing regions 64 in a range that is smaller than the described mass per unit area of the water-superabsorbent polymer particles 60 in the liquid absorbent regions 63.
  • the body side liner 36 and first sheet 61 joined thereto with the joining portions 59 have undulations in the liquid absorbent region 63 caused by the contraction of the elastics 37.
  • the ridges 27a and grooves 27b of the ridges and grooves 26 are alternately arranged in the longitudinal direction Y.
  • the liquid retaining portion 65 is formed in a void space between the first sheet 61 and second sheet 62.
  • each water-superabsorbent polymer particles 60 are capable of absorbing water more than ten (10) times of its own weight.
  • body fluid diffusibility is lower than that of water-absorbent fibers.
  • the absorbent layer 35 is formed of the water-superabsorbent polymer particles 60 only and the entire liquid absorbent regions 63 are filled with them, only the water-superabsorbent polymer particles 60 of portions in which body fluid is discharged absorb body fluid and the body fluid hardly diffuses to other parts. Therefore, body fluid remains on the surface of the body side liner 36 for a while after excretion, thereby potentially creating a feeling of discomfort against the wearer and/or causing skin irritations.
  • the following configuration may solve the problem.
  • the body fluid discharged in the liquid absorbent regions 63 flows into the grooves 27b, and quickly moves downward by its own weight, that is, inside the liquid absorbent layer 35, and the absorbing speed of the body fluid may be increased compared to a body side liner 36 without undulations.
  • the sealing regions 64 are formed between the liquid absorbent regions 63. Therefore the body fluid discharged flows not only into the grooves 27b but also in the sealing regions 64, since the water-superabsorbent polymer particles 60 are bonded in portions of the liquid absorbent regions 63 located on both sides of each of the grooves 27b and/or sealing regions 64, body fluid flowed therein is enhanced to move downward, thereby body fluid may be more quickly absorbed.
  • the liquid absorbent structure 15 is in a curved shape.
  • Body fluid flowed into the grooves 27b on the front and rear waist region 11, 12 sides is apt to flow downward, that is, to the midsection of the crotch region 13.
  • the liquid absorbent structure 15 is in a bent/curved shape in the longitudinal direction Y, which is a shape substantively in parallel with the base sheet 34.
  • Body fluid having permeated the body side liner 36 and first sheet 61 moves to the body fluid retaining portion 65 formed in the void space between the first sheet 61 and second sheet 62.
  • the body fluid that moved to the body fluid retaining portion 65 spreads in the liquid absorbent region 63 so as to be absorbed and retained by the water-superabsorbent polymer particles 60 in the liquid absorbent region 63.
  • the contraction of the elastics 37 is used to provide the body side liner 36 and the first sheet 61 with undulations so as to form the ridges 27a and grooves 27b so that body fluid flowed into the grooves 27b and/or sealing regions 64 is allowed to quickly move to the body fluid retaining portion 65 and temporarily retain therein and diffused in the liquid absorbent regions 63. Therefore it is possible that all or most, rather than some, of the water-superabsorbent polymer particles 60 of the liquid absorbent region 63 absorb and retain the body fluid.
  • the absorbent performance of the entire absorbent materials improves, body fluid does not tend to remain on the surface of the body side liner 36 for a relatively long time, without creating a feeling of discomfort against the wearer for a long time or causing skin irritations such as rashes or the like. It is also possible to obtain the similar effect by using a sheet having undulations as the body side liner 36. However, by forming the undulations using the contraction of the elastics 37, it is possible to provide a more stable undulation shape on the body side liner 36 which do not be deformed by a body pressure of the wearer. As long as one or more of the effects is obtained, the liquid absorbent layer 35 may not necessarily be divided into a plurality of liquid absorbent regions 63.
  • liquid absorbent layer 35 is divided into a plurality of liquid absorbent regions 63, body fluid diffuses in the body fluid retaining portion 65 at a faster rate so that the body fluid is absorbed more quickly compared to when only a single liquid absorbent region 63 is formed in the liquid absorbent layer 35.
  • the liquid absorbent structure 15 is bonded to the base sheet 34 by the bonding region 54 in a rectangular frame shape, and the midsection of the liquid absorbent structure 15 faces the central non-bonding region 56 without being bonded to the base sheet 34. Accordingly, even if the liquid absorbent layer 35 is relatively thin in the thickness dimension and has undulations formed by the contraction of the elastics 37, the base sheet 34 is unlikely to be wrinkled by the effect and/or exhibit undesired appearance.
  • the height dimension of the ridges 27a i.e., the distance from tops 70 of the ridges 27a to the bottoms 71 of the grooves 27b
  • H be 2.5 to 15 mm. If H is smaller than 2.5 mm, the ridges 27a become relatively small, without forming a sufficiently large body fluid retaining portion 65, while if H is larger than 15 mm, the ridges 27a become relatively high, which might give a sense of discomfort to the wearer's skin.
  • the water-superabsorbent polymer particles 60 absorb the body fluid, they become swollen and the body fluid retaining portion 65 becomes filled with the water-superabsorbent polymer particles 60. More specifically, in respective liquid absorbent regions 63, as body fluid permeates, the hot melt adhesive 66 in which the water-superabsorbent polymer particles 60 and first sheet 61 are joined becomes wet so as to lower the adhesive force. Some of the water-superabsorbent polymer particles 60 are fallen off the inner side of the first sheet 61 to be loosely located on the second sheet 62.
  • the water-superabsorbent polymer particles 60 become swollen to be close to the grooves 27b, thereby quickly absorbing the body fluid flowing into the liquid absorbent layer 35 again.
  • gel block may be formed and it may prevent body fluid, that has flowed into the body fluid retaining portion 65 but not yet been absorbed by the water-superabsorbent polymer particles 60, from flowing back (rewetting) to the skin-facing side.
  • liquid absorbent regions 63 of the liquid absorbent layer 35 and elastics 37 are indicated in imaginary lines.
  • two columns of liquid absorbent regions 63 each having four sections in the longitudinal direction Y are arranged in the lateral direction X.
  • the elastics 37 are provided only in the midsection of the liquid absorbent structure 15. As described above, the elastics 37 are not provided in the entire liquid absorbent structure 15 but only in the midsection where most body fluid is discharged, thereby the ridges and grooves 26 are formed only in the midsection. Thus, the body fluid gathering in the grooves 27b and/or sealing regions 64 may also be quickly moved to the liquid absorbent layer 35.
  • a disposable wearing article having a longitudinal direction and lateral direction and including a liquid absorbent structure extending in the longitudinal direction, wherein: the liquid absorbent structure includes a liquid permeable body side liner and liquid absorbent layer; the liquid absorbent layer includes a liquid permeable first sheet, liquid permeable or liquid impermeable second sheet, and water-superabsorbent polymer particles disposed between the first and second sheet and secured on an inner side of the first sheet; a plurality of elastics extending in the longitudinal direction is provided in a stretched state between the body side liner and the first sheet at least in a midsection of the liquid absorbent layer; the body side liner and the first sheet are joined via a plurality of joining portions which extend in the longitudinal direction and is spaced apart from each other at predetermined intervals in the lateral direction; a plurality of ridges and grooves extending in the lateral direction is formed on the body side liner and the first sheet by contraction of the elastics so that
  • the feature disclosed in the above item (i) may include at least the following embodiments.
  • the liquid absorbent layer further includes sealing regions in which the first sheet and the second sheet are joined to each other and a plurality of liquid absorbent regions which is surrounded by the sealing regions and in which the water-superabsorbent polymer particles are covered.
  • the wearing article further includes a chassis defining a front waist region, a rear waist region, and a crotch region located between the front and rear waist regions, wherein in the crotch region of the chassis, a bonding region is formed to fix the liquid absorbent structure to the chassis, and a non-bonding region, where the absorbent structure is not bonded to the chassis, is surrounded by the bonding region and overlaps the elastics.
  • the elastics are provided while being stretched by about 1.2 to about 2.4 times their original length in the longitudinal direction, and a distance between the elastics adjacent to each other in the lateral direction is about 5 to about 40 mm.
  • the ridges and grooves are alternately arranged located in the longitudinal direction, and a distance between tops of the ridges and bottoms of the grooves is about 2.5 to about 15 mm.
  • the water-superabsorbent polymer particles have a mass per unit area of about 30 to about 300 g/m 2 .
  • the water-superabsorbent polymer particles are secured on the inner side of the first sheet with a hydrophobic hot melt adhesive.
  • the liquid absorbent regions include an absorbent material that is formed of a mixture of the water-superabsorbent polymer particles and water-absorbent fibers, and a mixture rate of the water-absorbent fibers is equal to or smaller than 30% by mass.
  • the body fluid retaining portion is formed in a void space between the first sheet and the second sheet.
  • the body side liner and the first sheet are defined by a plurality of ridges and grooves formed by contraction of the elastics and the water-absorbent polymer particles are secured on the inner side of the first sheet, thereby body fluid discharged on the body side liner may flow into the grooves formed between the adjacent ridges and then may immediately move to the liquid absorbent layer to be temporarily retained in the body fluid retaining portion provided between the first sheet and second sheet.
  • the body fluid moved to the body fluid retaining portion may diffuse in the absorbent layer to be absorbed and retained in the water-absorbent polymer particles.

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
PCT/JP2012/006207 2011-09-30 2012-09-27 Disposable wearing article WO2013046702A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011218513A JP5777476B2 (ja) 2011-09-30 2011-09-30 使い捨て着用物品
JP2011-218513 2011-09-30

Publications (1)

Publication Number Publication Date
WO2013046702A1 true WO2013046702A1 (en) 2013-04-04

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TW (1) TWI554256B (ja)
WO (1) WO2013046702A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3219202A4 (en) * 2014-11-14 2017-11-08 Unicharm Corporation Absorptive article for pets

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6021447B2 (ja) * 2012-06-04 2016-11-09 ユニ・チャーム株式会社 開放型の使い捨ておむつ
FR2993465B1 (fr) * 2012-07-23 2015-06-26 Commissariat Energie Atomique Article destine a venir en contact avec un liquide, notamment pansement.
JP6213878B2 (ja) * 2014-09-30 2017-10-18 大王製紙株式会社 吸収性物品
JP6492145B1 (ja) * 2017-09-29 2019-03-27 大王製紙株式会社 吸収性物品

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JPS5611820U (ja) * 1979-07-06 1981-01-31
JPH09327479A (ja) * 1996-06-10 1997-12-22 Kao Corp 吸水性シート及びその製造方法並びにそれを用いた吸収性物品
JPH11170414A (ja) * 1997-12-12 1999-06-29 Ajinomoto Co Inc 高吸水性シート及びその製造方法
WO2001089439A1 (fr) * 2000-05-23 2001-11-29 Toyo Eizai Kabushiki Kaisha Feuille ultra-mince absorbante, article absorbant jetable equipe de cette feuille et dispositif de production de celle-ci
JP2002371456A (ja) * 2001-06-08 2002-12-26 Uni Charm Corp 伸縮性複合シートおよび伸縮性複合シートに多数の襞を形成する方法
JP2010522595A (ja) * 2007-03-26 2010-07-08 ファメッカニカ．データ エス．ピー．エー． 超吸収性材料を含有する拡大可能な凹部を備える衛生物品用の吸収体および製造方法
WO2012137809A1 (ja) * 2011-04-04 2012-10-11 ユニ・チャーム株式会社 使い捨て吸収性物品

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EP1447066B1 (en) * 2003-02-12 2008-10-01 The Procter & Gamble Company Comfortable diaper
JP5047074B2 (ja) * 2008-06-26 2012-10-10 花王株式会社 吸収性物品用の伸縮シート

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Publication number Priority date Publication date Assignee Title
JPS5611820U (ja) * 1979-07-06 1981-01-31
JPH09327479A (ja) * 1996-06-10 1997-12-22 Kao Corp 吸水性シート及びその製造方法並びにそれを用いた吸収性物品
JPH11170414A (ja) * 1997-12-12 1999-06-29 Ajinomoto Co Inc 高吸水性シート及びその製造方法
WO2001089439A1 (fr) * 2000-05-23 2001-11-29 Toyo Eizai Kabushiki Kaisha Feuille ultra-mince absorbante, article absorbant jetable equipe de cette feuille et dispositif de production de celle-ci
JP2002371456A (ja) * 2001-06-08 2002-12-26 Uni Charm Corp 伸縮性複合シートおよび伸縮性複合シートに多数の襞を形成する方法
JP2010522595A (ja) * 2007-03-26 2010-07-08 ファメッカニカ．データ エス．ピー．エー． 超吸収性材料を含有する拡大可能な凹部を備える衛生物品用の吸収体および製造方法
WO2012137809A1 (ja) * 2011-04-04 2012-10-11 ユニ・チャーム株式会社 使い捨て吸収性物品

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3219202A4 (en) * 2014-11-14 2017-11-08 Unicharm Corporation Absorptive article for pets

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JP2013078369A (ja) 2013-05-02
TWI554256B (zh) 2016-10-21
TW201334765A (zh) 2013-09-01
JP5777476B2 (ja) 2015-09-09

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