WO2014002440A1 - Wearing article - Google Patents

Wearing article Download PDF

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Publication number
WO2014002440A1
WO2014002440A1 PCT/JP2013/003840 JP2013003840W WO2014002440A1 WO 2014002440 A1 WO2014002440 A1 WO 2014002440A1 JP 2013003840 W JP2013003840 W JP 2013003840W WO 2014002440 A1 WO2014002440 A1 WO 2014002440A1
Authority
WO
WIPO (PCT)
Prior art keywords
waist
longitudinal direction
skin
crotch panel
transverse direction
Prior art date
Application number
PCT/JP2013/003840
Other languages
French (fr)
Inventor
Tatsuya Hashimoto
Toshifumi Otsubo
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
Priority to CN201380034381.9A priority Critical patent/CN104427962B/en
Publication of WO2014002440A1 publication Critical patent/WO2014002440A1/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
    • A61F13/49058—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by the modular concept of constructing the diaper
    • A61F13/4906—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by the modular concept of constructing the diaper the diaper having an outer chassis forming the diaper and an independent absorbent structure attached to the chassis
    • A61F13/49061—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by the modular concept of constructing the diaper the diaper having an outer chassis forming the diaper and an independent absorbent structure attached to the chassis the diaper having one or two waist members forming the diaper waist region and an independent absorbent structure attached to the one or two waist members forming 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
    • A61F13/45—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
    • A61F13/496—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
    • 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
    • A61F2013/49098—Other Details not otherwise provided of the absorbent articles specially adapted to be worn around the waist

Definitions

  • the present disclosure relates to wearing articles, for example, pull-on diapers, toilet-training pants, incontinence pants and the like.
  • JP 2008-508082 A discloses a pull-on diaper in which front and rear end portions of a main absorbent body defining a crotch region are joined to an annular elastic belt defining front and rear waist regions.
  • the main absorbent body includes a liquid-permeable topsheet, a liquid-impermeable backsheet, an absorbent core interposed between these sheets and a pair of barrier-cuffs arranged so as to extend in a longitudinal direction along lateral edge portions of the core. All these elements (except the absorbent core) have the same dimension in the longitudinal direction, and front and rear regions of these elements are respectively overlapped with and joined to the annular elastic belt. In the regions of the annular elastic belt in which the main absorbent body is overlapped with the annular elastic belt, the inventor(s) has noted that there is a likelihood that the breathability might be deteriorated and eventually a stuffiness or a diaper rash might be induced.
  • Some embodiments provide a wearing article which has a longitudinal direction, a transverse direction, a skin-facing surface, and a non-skin-facing surface opposite to the skin-facing surface.
  • the wearing article includes front and rear waist panels respectively defining front and rear waist regions, a crotch panel defining a crotch region, and an absorbent structure lying on the skin-facing surface of at least the crotch panel and extending in the longitudinal direction.
  • the crotch panel has front and rear end portions extending in the transverse direction and lateral edge portions extending in the longitudinal direction.
  • the front and rear end portions are respectively joined to the skin-facing surface of the front and rear waist panels and a dimension in the longitudinal direction of the crotch panel is smaller than a dimension in the longitudinal direction of the absorbent structure.
  • Some embodiments provide a wearing article which has a longitudinal direction, a transverse direction, a skin-facing surface, and a non-skin-facing surface opposite to the skin-facing surface.
  • the wearing article includes front and rear waist panels respectively defining front and rear waist regions, a crotch panel defining a crotch region, and an absorbent structure lying on the skin-facing surface of at least the crotch panel and extending in the longitudinal direction.
  • the crotch panel has front and rear end portions extending in the transverse direction and lateral edge portions extending in the longitudinal direction. The front and rear end portions are respectively joined to the skin-facing surface of the front and rear waist panels.
  • the absorbent structure includes an absorbent core having front and rear end portions extending in the transverse direction, and lateral edge portions extending in the longitudinal direction.
  • the rear end portion of the absorbent core lies inboard of the rear end portion of the crotch panel as viewed in the longitudinal direction.
  • the front end portion of the absorbent core lies outboard of the front end portion of the crotch panel as viewed in the longitudinal direction.
  • Fig. 1 is a perspective view of a diaper as an example of a wearing article according to some embodiments of the present invention.
  • Fig. 2 is a partially cutaway developed plan view with respective elastics in a state of the maximum elongation in a longitudinal direction as well as in a transverse direction.
  • Fig. 3 is an exploded perspective view of the diaper.
  • Fig. 4 is a sectional view taken along line IV-IV in Fig. 2.
  • Fig. 5 is a scale-enlarged sectional view taken along line V-V in Fig. 2.
  • Fig. 6 is a view similar to Fig. 5, illustrating a state during use of the diaper.
  • Fig. 7 is a scale-enlarged sectional view taken along line VII-VII in Fig. 2.
  • Fig. 8 is a view similar to Fig. 7, illustrating a state during use of the diaper.
  • a diaper 1 as an example of the wearing article has a longitudinal direction Y in parallel to a longitudinal axis 2-2 and a transverse direction X in parallel to transverse axis 3-3, and opposite skin-facing and non-skin-facing surfaces.
  • the wearing article includes a front waist region 12, a rear waist region 13, a crotch region 14 lying between the front and rear waist regions 12, 13, elastic front and rear waist panels 20, 30 respectively defining the front and rear waist regions 12, 13, a crotch panel 40 defining the crotch region 14 and attached to the side of the skin-facing surface of the front and rear waist panels 20, 30, and an absorbent structure 50 located on the interior side of the crotch panel 40 so as to extend in the longitudinal direction Y.
  • the front and rear waist panels 20, 30 may be respectively defined by inner end portions 20A, 30A, outer end portions 20B, 30B and lateral edges 20C, 30C.
  • the lateral edge portions 20C and the lateral edge portions 30C may be joined to each other along a series of seams 15 arranged at intervals in the longitudinal direction Y by, for example, fusion-bonding techniques such as a heat-embossing/debossing processing and an ultrasonic processing to form an annular elastic waist panel, thereby defining a waist-opening 16 and a pair of leg-openings 17.
  • the front and rear waist panels 20, 30 respectively have interior waist sheets 21, 31 lying on the side of the skin-facing surface and exterior waist sheets 22, 32 lying on the side of the non-skin-facing surface.
  • the exterior waist sheets 22, 32 have a width dimension in the longitudinal direction Y larger than that of the interior waist sheets 21, 31 and extend outwardly in the longitudinal direction Y beyond inner and outer end edges of the interior waist sheets 21, 31.
  • the interior waist sheets 21, 31 and the exterior waist sheets 22, 32 are joined to each other with for example a hot melt adhesive distributed to at least one of the inner surfaces thereof or a fusion-bonding technique.
  • Materials which may be used as the exterior waist sheets 22, 32 include fibrous nonwoven fabrics such as an SMS (spunbonded/meltblown/spunbonded) fibrous nonwoven fabric, a spun bonded fibrous nonwoven fabric, an air-through fibrous nonwoven fabric, a plastic sheet or a laminated sheet of one of these fibrous nonwoven fabrics and the plastic sheet, for example each having a mass per unit area in a range of about 10 to about 30 g/m 2 .
  • fibrous nonwoven fabrics such as an SMS (spunbonded/meltblown/spunbonded) fibrous nonwoven fabric, a spun bonded fibrous nonwoven fabric, an air-through fibrous nonwoven fabric, a plastic sheet or a laminated sheet of one of these fibrous nonwoven fabrics and the plastic sheet, for example each having a mass per unit area in a range of about 10 to about 30 g/m 2 .
  • Materials which may be used as the interior waist sheets 21, 31 include one or a combination of elastic fibrous nonwoven fabrics such as a spun bonded fibrous nonwoven fabric, a melt blown fibrous nonwoven fabric, a heat-rolled fibrous nonwoven fabric, an SMS fibrous nonwoven fabric, an air-laid fibrous nonwoven fabric and an air-through fibrous nonwoven fabric.
  • the elastic nonwoven fabrics may be formed from an elastomeric resin such as a polyethylene-based or polyurethane-based elastomeric resin, or from a thermoplastic resin such as polyethylene-, polypropylene-, polyester- or an acryl-based thermoplastic resin.
  • an inelastic fibrous nonwoven fabric also may be employed.
  • the exterior waist sheets 22, 32 may have folded regions 22A, 32A defined by portions of the exterior waist sheets 22, 32 extending outwardly in the longitudinal direction Y beyond the outer end portions of the interior waist sheets 21, 31 and folded inwardly in the longitudinal direction Y and extension regions 22b, 32b extending from the inner end portions of the interior waist sheets 21, 31 toward the transverse axis 3-3.
  • a plurality of thread, strand or string first and second waist elastics 24, 34 may be contractibly attached under tension, for example with a hot melt adhesive.
  • the first and second waist elastics 24, 34 extend in the transverse direction X across the entire regions 22A, 32A.
  • the extension regions 22B, 32B may be disposed with elongate reinforcing sheets 25, 35 formed for example of a fibrous nonwoven fabric, and thread, strand or string third and fourth waist elastics 26, 36 may be contractibly attached under tension respectively between the reinforcing sheets 25, 35 and the extension regions 22B, 32B respectively, for example with a hot melt adhesive.
  • the third and fourth waist elastics 26, 36 are respectively not continuous in vicinities of the longitudinal axis 2-2, to form inelastic regions 37A, 37B.
  • the adhesive may be distributed on respective opposite lateral portions of the exterior waist sheets 22, 32 exclusive of the respective midsections, then the third and fourth waist elastics 26, 36 continuously fed under tension onto the regions distributed with the adhesive as well as the inelastic regions 37A, 37B may be secured to the region distributed with the adhesive, and portions of the third and fourth elastics 26, 36 extending on the inelastic regions 37A, 37B may be cut so that respective inner end portions in a length direction of the third and fourth elastics 26, 36 may contract (snap back).
  • portions of the third and fourth elastics 26, 36 predetermined to extend across the inelastic regions 37A, 37B, may be inhibited from being elongated in order to form the inelastic regions 37A, 37B. It is also possible to deprive or inhibit a contractile property of the portions of the third and fourth waist elastics 26, 36 extending under tension across the inelastic regions 37A, 37B in order to form the inelastic regions.
  • the formation of the inelastic regions 37A, 37B ensures that the absorbent structure 50 located on the longitudinal axis 2-2 is prevented from getting wrinkled/creased, and the contractile force of the third and fourth waist elastics 26, 36 ensures that the leg-openings 17 are kept in close contact with the wearer's body to prevent leakage of body exudates such as urine.
  • the first to fourth waist elastics for example, an elastic material having a fineness in a range of about 310 to about 940 dtex and an elongation ratio in a range of 2.0 to 3.5 may be used.
  • the front and rear waist panels 20, 30 as illustrated have inner end regions 61, 62 in which the third and fourth waist elastics 26, 36 are arranged, outer end regions 63, 64 in which the first and second waist elastics 24, 34 are arranged and intermediate regions 65, 66 defined between these regions 61, 62 and 63, 64.
  • the dimension in the longitudinal direction Y of the respective inner end regions 61, 62 may be in a range of about 10 to about 40% of the dimension in the longitudinal direction Y of the front and rear waist panels 20, 30, respectively, and, in at least one embodiment, by way of example, this dimension is about 27.3% (about 30 mm).
  • graphic display films 23, 33 formed of plastic material may be interposed, so that these graphic display films may be respectively located on midsections in the transverse direction X of the front and rear waist regions 12, 13.
  • the graphic display films 23, 33 may be printed on the non-skin-facing surface with graphics (not shown) or the like, which are visually recognizable from the outside.
  • the crotch panel 40 has front and rear end portions 40A, 40B extending in the transverse direction X and overlapping with the front and rear waist panels 20, 30, and lateral edge portions 40C extending in the longitudinal direction Y wherein the front and rear end portions 40A, 40B are respectively overlapped with and joined to the interior surface regions 61, 62 of the front and rear waist panels 20, 30.
  • the crotch panel 40 respectively overlaps with each of the front and rear panels 20, 30 in a range of about 10 to about 40% of dimensions in the longitudinal direction Y of each of the front and rear waist panels.
  • the crotch panel 40 may include a base sheet 41 lying in a midsection in the transverse direction X, and a pair of leg sheets 42 lying on opposite sides of and attached to lateral edge portions of the base sheet 41.
  • the front and rear end portions 40A, 40B are respectively defined by front and rear end portions of the base sheet 41 and the leg sheets 42 and the lateral edge portions 40C are defined by respective outer lateral edge portions 42C of the leg sheets 42.
  • the base sheet 41 includes an interior crotch sheet 43 and an exterior crotch sheet 44. While various types of fibrous nonwoven fabrics or plastic films may be used as material of the interior and exterior crotch sheets 43, 44, the interior crotch sheet 43 is preferably formed of a leakage barrier plastic film and the exterior crotch sheet 44 is preferably formed of a fibrous nonwoven fabric providing a texture superior to that of the plastic film in consideration that the exterior crotch sheet 44 partially constituting the exterior surface of the diaper 1.
  • the leg sheets 42 may have respective inner lateral edge portions attached between the interior and exterior crotch sheets 43, 44.
  • Each of the leg sheets 42 may have the outer lateral edge portion 42C folded inwardly in the transverse direction X and a plurality of thread, strand or string leg elastics 46 extending in the longitudinal direction Y may be attached within a sleeve defined by the folding portion 45.
  • the leg sheets 42 are elasticized with the leg elastics 46.
  • material of the leg elastics 46 for example elastic materials having a fineness in a range of about 310 to about 620 dtex and an elongation ratio in a range of about 2.0 to about 3.0 may be used, and the elastics are contractibly attached under tension within the sleeve with a hot melt adhesive.
  • the leg elastics 46 include the innermost leg elastic 46A closest to the longitudinal axis 2-2, i.e., lying on the innermost side in the transverse direction X, the outermost leg elastic 46B lying on the outermost side in the transverse direction X and intermediate leg elastics 46C lying between the leg elastic 46A and the leg elastic 46B.
  • each of the innermost leg elastic 46A and the outermost leg elastic 46B is defined by a single elastic thread
  • the intermediate leg elastics 46C are defined by four elastic threads.
  • the outermost leg elastic 46B extends across the outer lateral edge portion 42C of the associated leg sheet 42, and the outer lateral edge portion 42C is folded inwardly along the outermost leg elastic 46B.
  • the innermost leg elastic 46A may have a tensile stress higher than those of the outermost leg elastic 46B and the intermediate leg elastics 46C.
  • an elastic thread having a fineness of about 470 dtex and an elongation ratio of about 2.45 may be used for the innermost leg elastic 46A and an elastic thread having a fineness of about 310 dtex and an elongation ratio of about 2.45 may be used for the outermost leg elastic 46B and the intermediate leg elastics 46C.
  • the crotch panel 40 may be put in close contact with the wearer's body in a region sufficiently close to the absorbent structure 50 to prevent a leakage of body exudates. If the tensile stresses of the outermost leg elastic 46B and the intermediate leg elastics 46C are set to be relatively low, in consequence, it is possible to prevent the leg sheets 42 from being curled inwardly of the diaper 1 and to keep the leg sheets 42 in close contact with groins of the wearer.
  • the third leg elastics 26 extending in the transverse direction X may intersect (or overlap) with all of the innermost leg elastic 46A, the outermost leg elastic 46B and the intermediate leg elastics 46C. Consequently, the absorbent structure 50 may be kept in contact with the wearer's body under a contractile force of the third waist elastics 26 and a gap, through which body exudates might leak, is unlikely to be formed between the wearer's body and the absorbent structure 50 due to movements of the wearer's thighs.
  • the fourth waist elastics 36 extending in the transverse direction X may intersect (or overlap) with the outermost leg elastic 46B and at least one of the intermediate leg elastics 46C, but not with the remaining intermediate leg elastics 46C and the innermost leg elastic 46A.
  • a contractile force of particularly the fourth waist elastics 36 does not work directly on the absorbent structure 50, and cracks and/or wrinkles potentially causing a leakage of body exudates are unlikely to be generated.
  • the leg elastics 46 intersect with the third and fourth waist elastics 26, 36 is meant that the reinforcing sheets 25, 35 respectively disposed with the third and fourth waist elastics 26, 36 contractibly attached thereto under tension and the leg sheets 42 disposed with the leg elastics 46 contractibly attached thereto under tension are joined to each other and consequently an effective elongation region of the leg elastics 46 and effective elongation regions of the third and fourth leg elastics 26, 36 are substantially in a coordinating relationship.
  • the base sheet 41 of the crotch panel 40 is disposed on the skin-facing surface thereof with the absorbent structure 50.
  • the absorbent structure 50 may have a longitudinally long pad-like configuration and includes the front and rear end portions 50A, 50B, lateral edge portions 50C, an absorbent core 51 extending in the longitudinal direction Y at least in the crotch region 14 and a bodyside liner 52 lying on an absorbent surface of the absorbent core 51, i.e., on the skin-facing surface of the absorbent core 51.
  • the front end portion 50A may be attached to the interior waist sheet 21 of the front waist panel 20 for example with a hot melt adhesive.
  • the rear end 50B may be attached between the interior waist sheet 31 of the rear waist panel 30 and the exterior waist sheet 32, more specifically, between the interior waist sheet 31 and the reinforcing sheet 35, for example with a hot melt adhesive.
  • An intermediate portion of the absorbent structure 50 between the front and rear end portions 50A, 50B may be attached to the interior crotch sheet 43 of the crotch panel 40 for example with a hot melt adhesive.
  • the absorbent structure 50 is attached to the skin-facing surface of the interior waist sheet 21 and, in consequence, the elasticized and relatively flexible interior waist sheet 21 comes in direct contact with the wearer's skin so as to improve texture.
  • the absorbent structure 50 when the absorbent structure 50 is attached between the interior waist sheet 31 and the exterior waist sheet 32, consequently, even if a voided urine diffuses from the crotch region 14 to the portion of the absorbent structure 50 lying in the rear waist region 13, it is possible to prevent body exudates from coming in direct contact with the wearer's skin.
  • the absorbent core 51 has a mass per unit area for example in a range of about 200 to about 800 g/m 2 and includes for example core materials formed of a mixture of fluff wood pulp, superabsorbent polymer particles (SAP) and optionally contained thermal bonding staple fibers, and a liquid-permeable fibrous nonwoven fabric adapted to wrap the core materials.
  • core materials formed of a mixture of fluff wood pulp, superabsorbent polymer particles (SAP) and optionally contained thermal bonding staple fibers, and a liquid-permeable fibrous nonwoven fabric adapted to wrap the core materials.
  • SAP superabsorbent polymer particles
  • a liquid-permeable fibrous nonwoven fabric adapted to wrap the core materials.
  • various types of fibrous nonwoven fabrics such as a liquid-permeable spun bonded nonwoven fabric or an SMS nonwoven fabric each having a mass per unit area in a range of about 10 to about 30 g/m 2 may be used, for example.
  • a dimension L1 in the longitudinal direction Y of the crotch panel 40 is smaller than a dimension L2 in the longitudinal direction Y of the absorbent structure 50, so the front and rear end portions 50A, 50B of the absorbent structure 50 lie outboard of the front and rear end portions 40A, 40B of the crotch panel 40.
  • the dimension in the longitudinal direction Y of the crotch panel 40 may be set to be relatively small in this manner to reduce an area over which the crotch panel 40 overlaps with the front and rear waist panels 20, 30 and to ensure a correspondingly high breathability of the front and rear waist panels 20, 30.
  • the dimension L1 in the longitudinal direction of the crotch panel 40 is about 296 mm and the dimension L2 in the longitudinal direction of the absorbent structure 50 is about 330 mm.
  • a dimension W1 in the transverse direction X of the crotch panel 40 may be larger than a dimension W2 in the transverse direction X of the absorbent structure 50 and, in consequence, the lateral edge portions 40C of the crotch panel 40 may extend outwardly in the transverse direction X beyond the lateral edge portions 50C.
  • the portions of the crotch panel 40 extending outwardly in the transverse direction X beyond the absorbent structure 50 are the leg sheets 42 which are the constituents of the crotch panel 40 and these sheets may be flexibly put in close contact with the wearer's skin.
  • the dimension W1 in the transverse direction X of the crotch panel 40 is about 210 mm and the dimension W2 in the transverse direction X of the absorbent structure 50 is about 115 mm.
  • a dimension of the bodyside liner 52 may be larger than a dimension of the absorbent core 51 in the longitudinal direction Y, so that front and rear end portions 52A, 52B of the bodyside liner 52 extend outwardly in the longitudinal direction Y beyond the front and rear end portions 51A, 51B of the absorbent core 51.
  • the front and rear end portions 52A, 52B of the bodyside liner 52 coincide with the front and rear end portions 50A, 50B of the absorbent structure 50.
  • a front end portion 51A of the absorbent core 51 lies in the intermediate region 65 of the front waist panel 20. In other words, the front end portion 51A lies outboard of the front end portion 40A of the crotch panel 40 as viewed in the longitudinal direction Y.
  • the wearer's urethral organ is at a distance from the transverse axis 3-3 toward the front waist region 12 and, in consideration of this, the absorbent core 51 may be biased forward to absorb the urine efficiently and to prevent the urine from leaking out from the diaper 1.
  • the rear end 51B of the absorbent core 51 lies inboard of the rear end portion 40B of the crotch panel 40 as viewed in the longitudinal direction Y. In this way, the rear end portion 51b may be put in close contact with the wearer's skin under the effect of the fourth waist elastics 36 and the leg elastics 46 to prevent leakage of body exudates such as feces from the rear waist region 13.
  • the crotch panel 40 overlaps the front and rear waist panels 20, 30 in the inner end regions 61, 62 but not in the intermediate regions 65, 66 as well as in the outer end regions 63, 64. With such a unique arrangement, the wearer's legs are unlikely to be caught by the crotch panel 40 in the course of putting on the diaper 1. Were the crotch panel 40 to extend into the intermediate regions 65, 66 or the outer end regions 63, 64, the wearer's toes might be readily caught by the front and rear end portions 40A, 40B or the lateral edge portions 40C when putting on the diaper 1.
  • the front and rear end portions 40A, 40B may be put in close contact with the wearer's body under a contractile force of the third and fourth waist elastics 26, 36. In this way, the front and rear end portions 40A, 40B are unlikely to move and rub against the wearer's skin to irritate the wearer's skin.
  • the leg sheets 42 of the crotch panel 40 may be present outboard of the lateral edge portions 50C of the absorbent structure 50 in the transverse direction X.
  • Fig. 6 illustrating a state of the diaper 1 put on the wearer's body, the leg sheets 42 are put in close contact with the wearer's body H under a contractile force of the elastics 46. Consequently, outboard of the lateral edge portions 50C of the absorbent structure 50 in the transverse direction X, substantially no, or negligibly small, void spaces 53 are formed between the wearer's body H and the skin-facing surface of the diaper 1.
  • the crotch panel 40 does not overlap with the front waist panel 20 in the intermediate regions 65 and, in consequence, the leg sheets 42 are not present outboard of the lateral edge portions 50C of the absorbent structure 50 in the transverse direction X, in a region where the absorbent core 51 extends outwardly beyond the front end portion 40A of the crotch panel 40 in the longitudinal direction Y.
  • the absorbent core 51 is in contact with the interior waist sheet 21 of the front waist panel 20.
  • void spaces 53 larger than those formed in the inner end regions 61 in Fig. 6 are formed between the wearer's body H and the skin-facing surface of the diaper 1.
  • the void spaces are formed between the front waist panel 20 and the wearer's body H when the bodyside liner 52 comes in contact with the wearer's body H due to the fact that the absorbent core 51 is thicker than other constituents such as the sheets.
  • the void spaces 53 formed between the wearer's body H and the diaper 1 may improve breathability of the diaper 1.
  • the void spaces 53 formed on opposite sides of the absorbent structure 50 tend to be highly humid, so the void spaces 53 may efficiently inhibit a stuffiness within the diaper 1.
  • the absorbent structure 50 extends only into the inner end regions 62 in the rear waist region 30 according to at least one embodiment, it is possible to arrange the absorbent structure 50 so as to extend to the intermediate region 66 and the outer end region 64. In this case, void spaces similar to the void spaces 53 in the front waist panel 20 will be formed also in the rear waist panel 30.
  • the interior waist sheets 21, 31 are respectively located on the skin-facing surface of the intermediate regions 65, 66. Since the crotch panel 40 does not overlap with the intermediate regions 65, 66, the interior waist sheets 21, 31 come in direct contact with the wearer's skin in the intermediate regions 65, 66 during use of the diaper 1. Specifically, the interior waist sheets 21, 31 come in contact with the wearer's skin over a larger area than where the crotch panel 40 overlapping with the intermediate regions 65, 66 comes in contact with the wearer's skin. Since the interior waist sheets 21, 31 are formed of an elastic fibrous nonwoven fabric, it is possible to put the front and rear waist regions 12, 13 of the diaper 1 in close contact with the wearer's body over a large area and, in addition, to improve the texture.
  • the constituent elements of the diaper 1 are not limited to those described in the present description and other various types of materials widely used, or to be developed, in the relevant technical field may be used without limitation unless otherwise stated.
  • the terms “first”, “second”, “third” and “fourth” used herein are merely to distinguish the similar elements and/or similar positions.
  • a wearing article having a longitudinal direction, a transverse direction, and opposite skin-facing and non-skin-facing surfaces, the article including: front and rear waist panels respectively defining front and rear waist regions; a crotch panel defining a crotch region; and an absorbent structure lying on the skin-facing surface of at least the crotch panel and extending in the longitudinal direction, wherein: the crotch panel has front and rear end portions extending in the transverse direction and lateral edge portions extending in the longitudinal direction, wherein the front and rear end portions are respectively joined to the skin-facing surface of the front and rear waist panels; and a dimension in the longitudinal direction of the crotch panel is smaller than a dimension in the longitudinal direction of the absorbent structure.
  • a dimension in the transverse direction of the crotch panel is larger than a dimension in the transverse direction of the absorbent structure, and the lateral edge portions of the crotch panel extend outwardly in the transverse direction beyond the absorbent structure.
  • the front and rear waist panels respectively have outer end regions disposed with first and second waist elastics extending in the transverse direction and contractibly attached thereto under tension, inner end regions provided with third and fourth waist elastics extending in the transverse direction and contractibly attached thereto under tension, and intermediate regions respectively lying between the inner and outer end regions; and the front and rear end portions of the crotch panel are respectively overlapped with and joined to the inner end regions of the front and rear waist panels.
  • the crotch panel has a base sheet lying in a midsection as viewed in the transverse direction, and leg sheets lying on opposite sides of the base sheet so as to extend outwardly in the transverse direction beyond the absorbent structure.
  • the leg sheets are disposed with leg elastics extending in the longitudinal direction and contractibly attached thereto under tension.
  • the absorbent structure includes an absorbent core having front and rear end portions extending in the transverse direction, and lateral edge portions extending in the longitudinal direction, and a bodyside liner lying on the skin-facing surface of the absorbent core; and the rear end portion of the absorbent core lies inboard of the rear end portion of the crotch panel as viewed in the longitudinal direction.
  • the front end portion of the absorbent core lies outboard of the front end portion of the crotch panel as viewed in the longitudinal direction.
  • the respective intermediate regions of the front and rear waist panels include, on the skin-facing surface, interior waist sheets formed of an elastic fibrous nonwoven fabric.
  • a front end portion of the absorbent structure is attached to the skin-facing surface of the interior waist sheet of the front waist panel.
  • the absorbent core is in contact with the interior waist sheet of the front waist panel.
  • the front and rear waist panels include, on the non-skin-facing surface, exterior waist sheets, and a rear end portion of the absorbent structure is attached between the interior waist sheet and the exterior waist sheet of the rear waist panel.
  • the interior waist sheets are configured to come in direct contact with a wearer's skin in the intermediate regions, during use of the wearing article, over a larger area than where the crotch panel overlapping with the intermediate regions is configured to come in contact with the wearer's skin.
  • the leg sheets are not present outboard of the lateral edge portions of the absorbent structure in the transverse direction, in a region where the absorbent core extends outwardly beyond the front end portion of the crotch panel in the longitudinal direction.
  • a wearing article having a longitudinal direction, a transverse direction, and opposite skin-facing surface and non-skin-facing surface, the article including: front and rear waist panels respectively defining front and rear waist regions; a crotch panel defining a crotch region; and an absorbent structure lying on the skin-facing surface of at least the crotch panel and extending in the longitudinal direction, wherein: the crotch panel has front and rear end portions extending in the transverse direction and lateral edge portions extending in the longitudinal direction, wherein the front and rear end portions are respectively joined to the skin-facing surface of the front and rear waist panels; the absorbent structure includes an absorbent core having front and rear end portions extending in the transverse direction, and lateral edge portions extending in the longitudinal direction; the rear end portion of the absorbent core lies inboard of the rear end portion of the crotch panel as viewed in the longitudinal direction; and the front end
  • the present disclosure described above may include at least following embodiments, which may be taken in isolation or in combination with one another.
  • the front and rear waist panels respectively have outer end regions disposed with first and second waist elastics extending in the transverse direction and contractibly attached thereto under tension, inner end regions provided with third and fourth waist elastics extending in the transverse direction and contractibly attached thereto under tension, and intermediate regions respectively lying between the inner and outer end regions; and the front and rear end portions of the crotch panel are respectively overlapped with and joined to the inner end regions of the front and rear waist panels.
  • the respective intermediate regions of the front and rear waist panels include, on the skin-facing surface, interior waist sheets formed of an elastic fibrous nonwoven fabric; and a front end portion of the absorbent structure is attached to the skin-facing surface of the interior waist sheet of the front waist panel.
  • the absorbent core is in contact with the interior waist sheet of the front waist panel.
  • the front and rear waist panels include, on the non-skin-facing surface, exterior waist sheets, and a rear end portion of the absorbent structure is attached between the interior waist sheet and the exterior waist sheet of the rear waist panel.
  • the interior waist sheets are configured to come in direct contact with a wearer's skin in the intermediate regions, during use of the wearing article, over a larger area than where the crotch panel overlapping with the intermediate regions is configured to come in contact with the wearer's skin.
  • the crotch panel has a base sheet lying in a midsection as viewed in the transverse direction, and leg sheets lying on opposite sides of the base sheet so as to extend outwardly in the transverse direction beyond the absorbent structure; the leg sheets are disposed with leg elastics extending in the longitudinal direction and contractibly attached thereto under tension; and the leg sheets are not present outboard of the lateral edge portions of the absorbent structure in the transverse direction, in a region where the absorbent core extends outwardly beyond the front end portion of the crotch panel in the longitudinal direction.
  • the dimension in the longitudinal direction of the crotch panel is set to be smaller than that of the absorbent structure so that each area over which the crotch panel overlaps with the front and rear waist panels may be reduced. In this way, breathability in the front and rear waist panels may be ensured.
  • Embodiments of the present invention are applicable to, for example, pull-on diapers, toilet-training pants and incontinent pants or the like.

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Abstract

A diaper (1) includes elastic front and rear waist panels (20, 30) respectively defining front and rear waist regions (12, 13), a crotch panel (40) defining a crotch region (14) and attached to the front and rear waist panels (20, 30) and an absorbent structure (50) located on an interior side of the crotch panel (40) and extending in a longitudinal direction (Y). A dimension (L1) in a longitudinal direction (Y) of the crotch panel (40) is smaller than a dimension (L2) of the absorbent structure (50) and front and rear end portions (50A, 50B) of the absorbent structure (50) lie outboard of front and rear end portions (40A, 40B) of the crotch panel (40) as viewed in a longitudinal direction (Y). A dimension (W1) in a transverse direction (X) of the crotch panel (40) is larger than a dimension (W2) of the absorbent structure (50) and lateral edge portions (40C) of the crotch region (40) extend outwardly in the transverse direction (X) beyond lateral edge portions (50C) of the absorbent structure (50).

Description

WEARING ARTICLE
The present disclosure relates to wearing articles, for example, pull-on diapers, toilet-training pants, incontinence pants and the like.
Background
Wearing articles are known having a crotch region joined to front and rear waist regions. For example, JP 2008-508082 A (PTL 1) discloses a pull-on diaper in which front and rear end portions of a main absorbent body defining a crotch region are joined to an annular elastic belt defining front and rear waist regions.
JP 2008-508082 A
Summary
In the wearing article disclosed in PTL 1, the main absorbent body includes a liquid-permeable topsheet, a liquid-impermeable backsheet, an absorbent core interposed between these sheets and a pair of barrier-cuffs arranged so as to extend in a longitudinal direction along lateral edge portions of the core. All these elements (except the absorbent core) have the same dimension in the longitudinal direction, and front and rear regions of these elements are respectively overlapped with and joined to the annular elastic belt. In the regions of the annular elastic belt in which the main absorbent body is overlapped with the annular elastic belt, the inventor(s) has noted that there is a likelihood that the breathability might be deteriorated and eventually a stuffiness or a diaper rash might be induced.
Some embodiments provide a wearing article which has a longitudinal direction, a transverse direction, a skin-facing surface, and a non-skin-facing surface opposite to the skin-facing surface. The wearing article includes front and rear waist panels respectively defining front and rear waist regions, a crotch panel defining a crotch region, and an absorbent structure lying on the skin-facing surface of at least the crotch panel and extending in the longitudinal direction.
The crotch panel has front and rear end portions extending in the transverse direction and lateral edge portions extending in the longitudinal direction. The front and rear end portions are respectively joined to the skin-facing surface of the front and rear waist panels and a dimension in the longitudinal direction of the crotch panel is smaller than a dimension in the longitudinal direction of the absorbent structure.
Some embodiments provide a wearing article which has a longitudinal direction, a transverse direction, a skin-facing surface, and a non-skin-facing surface opposite to the skin-facing surface. The wearing article includes front and rear waist panels respectively defining front and rear waist regions, a crotch panel defining a crotch region, and an absorbent structure lying on the skin-facing surface of at least the crotch panel and extending in the longitudinal direction.
The crotch panel has front and rear end portions extending in the transverse direction and lateral edge portions extending in the longitudinal direction. The front and rear end portions are respectively joined to the skin-facing surface of the front and rear waist panels. The absorbent structure includes an absorbent core having front and rear end portions extending in the transverse direction, and lateral edge portions extending in the longitudinal direction. The rear end portion of the absorbent core lies inboard of the rear end portion of the crotch panel as viewed in the longitudinal direction. The front end portion of the absorbent core lies outboard of the front end portion of the crotch panel as viewed in the longitudinal direction.
The drawings illustrate specific embodiments of the present invention including optional and preferred embodiments as well as essential features of the invention.
Fig. 1 is a perspective view of a diaper as an example of a wearing article according to some embodiments of the present invention. Fig. 2 is a partially cutaway developed plan view with respective elastics in a state of the maximum elongation in a longitudinal direction as well as in a transverse direction. Fig. 3 is an exploded perspective view of the diaper. Fig. 4 is a sectional view taken along line IV-IV in Fig. 2. Fig. 5 is a scale-enlarged sectional view taken along line V-V in Fig. 2. Fig. 6 is a view similar to Fig. 5, illustrating a state during use of the diaper. Fig. 7 is a scale-enlarged sectional view taken along line VII-VII in Fig. 2. Fig. 8 is a view similar to Fig. 7, illustrating a state during use of the diaper.
The embodiments described below relate to a diaper as illustrated in Figures 1 through 8, including both optional and preferred features as well as those features which are essential features of the present invention.
Referring to Fig. 1, a diaper 1 as an example of the wearing article according to some embodiments of the present invention has a longitudinal direction Y in parallel to a longitudinal axis 2-2 and a transverse direction X in parallel to transverse axis 3-3, and opposite skin-facing and non-skin-facing surfaces. The wearing article includes a front waist region 12, a rear waist region 13, a crotch region 14 lying between the front and rear waist regions 12, 13, elastic front and rear waist panels 20, 30 respectively defining the front and rear waist regions 12, 13, a crotch panel 40 defining the crotch region 14 and attached to the side of the skin-facing surface of the front and rear waist panels 20, 30, and an absorbent structure 50 located on the interior side of the crotch panel 40 so as to extend in the longitudinal direction Y.
The front and rear waist panels 20, 30 may be respectively defined by inner end portions 20A, 30A, outer end portions 20B, 30B and lateral edges 20C, 30C. The lateral edge portions 20C and the lateral edge portions 30C may be joined to each other along a series of seams 15 arranged at intervals in the longitudinal direction Y by, for example, fusion-bonding techniques such as a heat-embossing/debossing processing and an ultrasonic processing to form an annular elastic waist panel, thereby defining a waist-opening 16 and a pair of leg-openings 17.
Referring to Figs. 2 through 4, in one example, the front and rear waist panels 20, 30 respectively have interior waist sheets 21, 31 lying on the side of the skin-facing surface and exterior waist sheets 22, 32 lying on the side of the non-skin-facing surface. The exterior waist sheets 22, 32 have a width dimension in the longitudinal direction Y larger than that of the interior waist sheets 21, 31 and extend outwardly in the longitudinal direction Y beyond inner and outer end edges of the interior waist sheets 21, 31. The interior waist sheets 21, 31 and the exterior waist sheets 22, 32 are joined to each other with for example a hot melt adhesive distributed to at least one of the inner surfaces thereof or a fusion-bonding technique.
Materials which may be used as the exterior waist sheets 22, 32 include fibrous nonwoven fabrics such as an SMS (spunbonded/meltblown/spunbonded) fibrous nonwoven fabric, a spun bonded fibrous nonwoven fabric, an air-through fibrous nonwoven fabric, a plastic sheet or a laminated sheet of one of these fibrous nonwoven fabrics and the plastic sheet, for example each having a mass per unit area in a range of about 10 to about 30 g/m2.
Materials which may be used as the interior waist sheets 21, 31 include one or a combination of elastic fibrous nonwoven fabrics such as a spun bonded fibrous nonwoven fabric, a melt blown fibrous nonwoven fabric, a heat-rolled fibrous nonwoven fabric, an SMS fibrous nonwoven fabric, an air-laid fibrous nonwoven fabric and an air-through fibrous nonwoven fabric. The elastic nonwoven fabrics may be formed from an elastomeric resin such as a polyethylene-based or polyurethane-based elastomeric resin, or from a thermoplastic resin such as polyethylene-, polypropylene-, polyester- or an acryl-based thermoplastic resin. As material of the interior waist sheets 21, 31, an inelastic fibrous nonwoven fabric also may be employed.
The exterior waist sheets 22, 32 may have folded regions 22A, 32A defined by portions of the exterior waist sheets 22, 32 extending outwardly in the longitudinal direction Y beyond the outer end portions of the interior waist sheets 21, 31 and folded inwardly in the longitudinal direction Y and extension regions 22b, 32b extending from the inner end portions of the interior waist sheets 21, 31 toward the transverse axis 3-3. Within the folded regions 22A, 32A, a plurality of thread, strand or string first and second waist elastics 24, 34 may be contractibly attached under tension, for example with a hot melt adhesive. The first and second waist elastics 24, 34 extend in the transverse direction X across the entire regions 22A, 32A. These first and second elastics 24, 34 arranged in this manner are particularly effective to keep the waist-opening 16 of the diaper 1 in close contact with the wearer's body and to prevent body exudates such as urine from leaking beyond the waist opening periphery.
The extension regions 22B, 32B may be disposed with elongate reinforcing sheets 25, 35 formed for example of a fibrous nonwoven fabric, and thread, strand or string third and fourth waist elastics 26, 36 may be contractibly attached under tension respectively between the reinforcing sheets 25, 35 and the extension regions 22B, 32B respectively, for example with a hot melt adhesive. The third and fourth waist elastics 26, 36 are respectively not continuous in vicinities of the longitudinal axis 2-2, to form inelastic regions 37A, 37B. As a method of forming these inelastic regions 37A, 37B of respective midsections of the front and rear waist regions 12, 13, for example, the adhesive may be distributed on respective opposite lateral portions of the exterior waist sheets 22, 32 exclusive of the respective midsections, then the third and fourth waist elastics 26, 36 continuously fed under tension onto the regions distributed with the adhesive as well as the inelastic regions 37A, 37B may be secured to the region distributed with the adhesive, and portions of the third and fourth elastics 26, 36 extending on the inelastic regions 37A, 37B may be cut so that respective inner end portions in a length direction of the third and fourth elastics 26, 36 may contract (snap back). Alternatively, portions of the third and fourth elastics 26, 36, predetermined to extend across the inelastic regions 37A, 37B, may be inhibited from being elongated in order to form the inelastic regions 37A, 37B. It is also possible to deprive or inhibit a contractile property of the portions of the third and fourth waist elastics 26, 36 extending under tension across the inelastic regions 37A, 37B in order to form the inelastic regions. The formation of the inelastic regions 37A, 37B ensures that the absorbent structure 50 located on the longitudinal axis 2-2 is prevented from getting wrinkled/creased, and the contractile force of the third and fourth waist elastics 26, 36 ensures that the leg-openings 17 are kept in close contact with the wearer's body to prevent leakage of body exudates such as urine.
As the first to fourth waist elastics, for example, an elastic material having a fineness in a range of about 310 to about 940 dtex and an elongation ratio in a range of 2.0 to 3.5 may be used.
The front and rear waist panels 20, 30 as illustrated have inner end regions 61, 62 in which the third and fourth waist elastics 26, 36 are arranged, outer end regions 63, 64 in which the first and second waist elastics 24, 34 are arranged and intermediate regions 65, 66 defined between these regions 61, 62 and 63, 64. The dimension in the longitudinal direction Y of the respective inner end regions 61, 62 may be in a range of about 10 to about 40% of the dimension in the longitudinal direction Y of the front and rear waist panels 20, 30, respectively, and, in at least one embodiment, by way of example, this dimension is about 27.3% (about 30 mm).
Between the interior waist sheets 21, 31 and the exterior waist sheets 22, 32, graphic display films 23, 33 formed of plastic material may be interposed, so that these graphic display films may be respectively located on midsections in the transverse direction X of the front and rear waist regions 12, 13. The graphic display films 23, 33 may be printed on the non-skin-facing surface with graphics (not shown) or the like, which are visually recognizable from the outside.
The crotch panel 40 has front and rear end portions 40A, 40B extending in the transverse direction X and overlapping with the front and rear waist panels 20, 30, and lateral edge portions 40C extending in the longitudinal direction Y wherein the front and rear end portions 40A, 40B are respectively overlapped with and joined to the interior surface regions 61, 62 of the front and rear waist panels 20, 30. Specifically in the illustrated embodiment, the crotch panel 40 respectively overlaps with each of the front and rear panels 20, 30 in a range of about 10 to about 40% of dimensions in the longitudinal direction Y of each of the front and rear waist panels.
The crotch panel 40 may include a base sheet 41 lying in a midsection in the transverse direction X, and a pair of leg sheets 42 lying on opposite sides of and attached to lateral edge portions of the base sheet 41. The front and rear end portions 40A, 40B are respectively defined by front and rear end portions of the base sheet 41 and the leg sheets 42 and the lateral edge portions 40C are defined by respective outer lateral edge portions 42C of the leg sheets 42.
The base sheet 41 includes an interior crotch sheet 43 and an exterior crotch sheet 44. While various types of fibrous nonwoven fabrics or plastic films may be used as material of the interior and exterior crotch sheets 43, 44, the interior crotch sheet 43 is preferably formed of a leakage barrier plastic film and the exterior crotch sheet 44 is preferably formed of a fibrous nonwoven fabric providing a texture superior to that of the plastic film in consideration that the exterior crotch sheet 44 partially constituting the exterior surface of the diaper 1. The leg sheets 42 may have respective inner lateral edge portions attached between the interior and exterior crotch sheets 43, 44.
Each of the leg sheets 42 may have the outer lateral edge portion 42C folded inwardly in the transverse direction X and a plurality of thread, strand or string leg elastics 46 extending in the longitudinal direction Y may be attached within a sleeve defined by the folding portion 45. Thus the leg sheets 42 are elasticized with the leg elastics 46. As material of the leg elastics 46, for example elastic materials having a fineness in a range of about 310 to about 620 dtex and an elongation ratio in a range of about 2.0 to about 3.0 may be used, and the elastics are contractibly attached under tension within the sleeve with a hot melt adhesive. The leg elastics 46 include the innermost leg elastic 46A closest to the longitudinal axis 2-2, i.e., lying on the innermost side in the transverse direction X, the outermost leg elastic 46B lying on the outermost side in the transverse direction X and intermediate leg elastics 46C lying between the leg elastic 46A and the leg elastic 46B. According to at least one embodiment, each of the innermost leg elastic 46A and the outermost leg elastic 46B is defined by a single elastic thread, and the intermediate leg elastics 46C are defined by four elastic threads. The outermost leg elastic 46B extends across the outer lateral edge portion 42C of the associated leg sheet 42, and the outer lateral edge portion 42C is folded inwardly along the outermost leg elastic 46B.
The innermost leg elastic 46A may have a tensile stress higher than those of the outermost leg elastic 46B and the intermediate leg elastics 46C. For example, an elastic thread having a fineness of about 470 dtex and an elongation ratio of about 2.45 may be used for the innermost leg elastic 46A and an elastic thread having a fineness of about 310 dtex and an elongation ratio of about 2.45 may be used for the outermost leg elastic 46B and the intermediate leg elastics 46C.
If the tensile stress of the innermost leg elastic 46A in the respective leg sheets 42 is set to be higher than that of each of the outermost leg elastic 46B and the intermediate leg elastics 46C, in consequence, the crotch panel 40 may be put in close contact with the wearer's body in a region sufficiently close to the absorbent structure 50 to prevent a leakage of body exudates. If the tensile stresses of the outermost leg elastic 46B and the intermediate leg elastics 46C are set to be relatively low, in consequence, it is possible to prevent the leg sheets 42 from being curled inwardly of the diaper 1 and to keep the leg sheets 42 in close contact with groins of the wearer.
In the front waist panel 20, the third leg elastics 26 extending in the transverse direction X may intersect (or overlap) with all of the innermost leg elastic 46A, the outermost leg elastic 46B and the intermediate leg elastics 46C. Consequently, the absorbent structure 50 may be kept in contact with the wearer's body under a contractile force of the third waist elastics 26 and a gap, through which body exudates might leak, is unlikely to be formed between the wearer's body and the absorbent structure 50 due to movements of the wearer's thighs. In the rear waist panel 30, the fourth waist elastics 36 extending in the transverse direction X may intersect (or overlap) with the outermost leg elastic 46B and at least one of the intermediate leg elastics 46C, but not with the remaining intermediate leg elastics 46C and the innermost leg elastic 46A. In consequence, in the rear waist region 13, a contractile force of particularly the fourth waist elastics 36 does not work directly on the absorbent structure 50, and cracks and/or wrinkles potentially causing a leakage of body exudates are unlikely to be generated.
As used herein, "the leg elastics 46 intersect with the third and fourth waist elastics 26, 36" is meant that the reinforcing sheets 25, 35 respectively disposed with the third and fourth waist elastics 26, 36 contractibly attached thereto under tension and the leg sheets 42 disposed with the leg elastics 46 contractibly attached thereto under tension are joined to each other and consequently an effective elongation region of the leg elastics 46 and effective elongation regions of the third and fourth leg elastics 26, 36 are substantially in a coordinating relationship.
The base sheet 41 of the crotch panel 40 is disposed on the skin-facing surface thereof with the absorbent structure 50. The absorbent structure 50 may have a longitudinally long pad-like configuration and includes the front and rear end portions 50A, 50B, lateral edge portions 50C, an absorbent core 51 extending in the longitudinal direction Y at least in the crotch region 14 and a bodyside liner 52 lying on an absorbent surface of the absorbent core 51, i.e., on the skin-facing surface of the absorbent core 51. The front end portion 50A may be attached to the interior waist sheet 21 of the front waist panel 20 for example with a hot melt adhesive. The rear end 50B may be attached between the interior waist sheet 31 of the rear waist panel 30 and the exterior waist sheet 32, more specifically, between the interior waist sheet 31 and the reinforcing sheet 35, for example with a hot melt adhesive. An intermediate portion of the absorbent structure 50 between the front and rear end portions 50A, 50B may be attached to the interior crotch sheet 43 of the crotch panel 40 for example with a hot melt adhesive. The absorbent structure 50 is attached to the skin-facing surface of the interior waist sheet 21 and, in consequence, the elasticized and relatively flexible interior waist sheet 21 comes in direct contact with the wearer's skin so as to improve texture. In addition, when the absorbent structure 50 is attached between the interior waist sheet 31 and the exterior waist sheet 32, consequently, even if a voided urine diffuses from the crotch region 14 to the portion of the absorbent structure 50 lying in the rear waist region 13, it is possible to prevent body exudates from coming in direct contact with the wearer's skin.
The absorbent core 51 has a mass per unit area for example in a range of about 200 to about 800 g/m2 and includes for example core materials formed of a mixture of fluff wood pulp, superabsorbent polymer particles (SAP) and optionally contained thermal bonding staple fibers, and a liquid-permeable fibrous nonwoven fabric adapted to wrap the core materials. As material of the bodyside liner 52, various types of fibrous nonwoven fabrics such as a liquid-permeable spun bonded nonwoven fabric or an SMS nonwoven fabric each having a mass per unit area in a range of about 10 to about 30 g/m2 may be used, for example.
Particularly referring to Fig. 2, a dimension L1 in the longitudinal direction Y of the crotch panel 40 is smaller than a dimension L2 in the longitudinal direction Y of the absorbent structure 50, so the front and rear end portions 50A, 50B of the absorbent structure 50 lie outboard of the front and rear end portions 40A, 40B of the crotch panel 40. The dimension in the longitudinal direction Y of the crotch panel 40 may be set to be relatively small in this manner to reduce an area over which the crotch panel 40 overlaps with the front and rear waist panels 20, 30 and to ensure a correspondingly high breathability of the front and rear waist panels 20, 30. According to at least one embodiment, the dimension L1 in the longitudinal direction of the crotch panel 40 is about 296 mm and the dimension L2 in the longitudinal direction of the absorbent structure 50 is about 330 mm.
A dimension W1 in the transverse direction X of the crotch panel 40 may be larger than a dimension W2 in the transverse direction X of the absorbent structure 50 and, in consequence, the lateral edge portions 40C of the crotch panel 40 may extend outwardly in the transverse direction X beyond the lateral edge portions 50C. The portions of the crotch panel 40 extending outwardly in the transverse direction X beyond the absorbent structure 50 are the leg sheets 42 which are the constituents of the crotch panel 40 and these sheets may be flexibly put in close contact with the wearer's skin. According to at least one embodiment, the dimension W1 in the transverse direction X of the crotch panel 40 is about 210 mm and the dimension W2 in the transverse direction X of the absorbent structure 50 is about 115 mm.
In the absorbent structure 50, a dimension of the bodyside liner 52 may be larger than a dimension of the absorbent core 51 in the longitudinal direction Y, so that front and rear end portions 52A, 52B of the bodyside liner 52 extend outwardly in the longitudinal direction Y beyond the front and rear end portions 51A, 51B of the absorbent core 51. The front and rear end portions 52A, 52B of the bodyside liner 52 coincide with the front and rear end portions 50A, 50B of the absorbent structure 50. A front end portion 51A of the absorbent core 51 lies in the intermediate region 65 of the front waist panel 20. In other words, the front end portion 51A lies outboard of the front end portion 40A of the crotch panel 40 as viewed in the longitudinal direction Y. During use of the diaper 1, the wearer's urethral organ is at a distance from the transverse axis 3-3 toward the front waist region 12 and, in consideration of this, the absorbent core 51 may be biased forward to absorb the urine efficiently and to prevent the urine from leaking out from the diaper 1. The rear end 51B of the absorbent core 51 lies inboard of the rear end portion 40B of the crotch panel 40 as viewed in the longitudinal direction Y. In this way, the rear end portion 51b may be put in close contact with the wearer's skin under the effect of the fourth waist elastics 36 and the leg elastics 46 to prevent leakage of body exudates such as feces from the rear waist region 13.
The crotch panel 40 overlaps the front and rear waist panels 20, 30 in the inner end regions 61, 62 but not in the intermediate regions 65, 66 as well as in the outer end regions 63, 64. With such a unique arrangement, the wearer's legs are unlikely to be caught by the crotch panel 40 in the course of putting on the diaper 1. Were the crotch panel 40 to extend into the intermediate regions 65, 66 or the outer end regions 63, 64, the wearer's toes might be readily caught by the front and rear end portions 40A, 40B or the lateral edge portions 40C when putting on the diaper 1.
Also, by attaching the crotch panel 40 exclusively to the inner end regions 61, 62, the front and rear end portions 40A, 40B may be put in close contact with the wearer's body under a contractile force of the third and fourth waist elastics 26, 36. In this way, the front and rear end portions 40A, 40B are unlikely to move and rub against the wearer's skin to irritate the wearer's skin.
Referring to Fig. 5, in the inner end region 61 of the front waist panel 20, the leg sheets 42 of the crotch panel 40 may be present outboard of the lateral edge portions 50C of the absorbent structure 50 in the transverse direction X. Referring to Fig. 6 illustrating a state of the diaper 1 put on the wearer's body, the leg sheets 42 are put in close contact with the wearer's body H under a contractile force of the elastics 46. Consequently, outboard of the lateral edge portions 50C of the absorbent structure 50 in the transverse direction X, substantially no, or negligibly small, void spaces 53 are formed between the wearer's body H and the skin-facing surface of the diaper 1.
Referring to Fig. 7, in at least one embodiment the crotch panel 40 does not overlap with the front waist panel 20 in the intermediate regions 65 and, in consequence, the leg sheets 42 are not present outboard of the lateral edge portions 50C of the absorbent structure 50 in the transverse direction X, in a region where the absorbent core 51 extends outwardly beyond the front end portion 40A of the crotch panel 40 in the longitudinal direction Y. In Fig. 7, the absorbent core 51 is in contact with the interior waist sheet 21 of the front waist panel 20. Referring to Fig. 8 illustrating a state of the diaper 1 put on the wearer's body, in the intermediate regions 65 of the front waist panel 20 and outboard of the lateral edge portions 50C of the absorbent structure 50 in the transverse direction X, void spaces 53 larger than those formed in the inner end regions 61 in Fig. 6 are formed between the wearer's body H and the skin-facing surface of the diaper 1. The void spaces are formed between the front waist panel 20 and the wearer's body H when the bodyside liner 52 comes in contact with the wearer's body H due to the fact that the absorbent core 51 is thicker than other constituents such as the sheets. The void spaces 53 formed between the wearer's body H and the diaper 1 may improve breathability of the diaper 1. The void spaces 53 formed on opposite sides of the absorbent structure 50 tend to be highly humid, so the void spaces 53 may efficiently inhibit a stuffiness within the diaper 1.
While the absorbent structure 50 extends only into the inner end regions 62 in the rear waist region 30 according to at least one embodiment, it is possible to arrange the absorbent structure 50 so as to extend to the intermediate region 66 and the outer end region 64. In this case, void spaces similar to the void spaces 53 in the front waist panel 20 will be formed also in the rear waist panel 30.
Still in at least one embodiment, in the front and rear waist panels 20, 30, the interior waist sheets 21, 31 are respectively located on the skin-facing surface of the intermediate regions 65, 66. Since the crotch panel 40 does not overlap with the intermediate regions 65, 66, the interior waist sheets 21, 31 come in direct contact with the wearer's skin in the intermediate regions 65, 66 during use of the diaper 1. Specifically, the interior waist sheets 21, 31 come in contact with the wearer's skin over a larger area than where the crotch panel 40 overlapping with the intermediate regions 65, 66 comes in contact with the wearer's skin. Since the interior waist sheets 21, 31 are formed of an elastic fibrous nonwoven fabric, it is possible to put the front and rear waist regions 12, 13 of the diaper 1 in close contact with the wearer's body over a large area and, in addition, to improve the texture.
The constituent elements of the diaper 1 are not limited to those described in the present description and other various types of materials widely used, or to be developed, in the relevant technical field may be used without limitation unless otherwise stated. The terms "first", "second", "third" and "fourth" used herein are merely to distinguish the similar elements and/or similar positions.
Various embodiments in accordance with the disclosure of a first aspect may be arranged in at least one or more of the following features:
(1) A wearing article having a longitudinal direction, a transverse direction, and opposite skin-facing and non-skin-facing surfaces, the article including:
front and rear waist panels respectively defining front and rear waist regions;
a crotch panel defining a crotch region; and
an absorbent structure lying on the skin-facing surface of at least the crotch panel and extending in the longitudinal direction, wherein:
the crotch panel has front and rear end portions extending in the transverse direction and lateral edge portions extending in the longitudinal direction, wherein the front and rear end portions are respectively joined to the skin-facing surface of the front and rear waist panels; and
a dimension in the longitudinal direction of the crotch panel is smaller than a dimension in the longitudinal direction of the absorbent structure.
The present disclosure described above may include at least the following embodiments, which may be taken in isolation or in combination with one another:
(1.1) A dimension in the transverse direction of the crotch panel is larger than a dimension in the transverse direction of the absorbent structure, and the lateral edge portions of the crotch panel extend outwardly in the transverse direction beyond the absorbent structure.
(1.2) The front and rear waist panels respectively have
outer end regions disposed with first and second waist elastics extending in the transverse direction and contractibly attached thereto under tension,
inner end regions provided with third and fourth waist elastics extending in the transverse direction and contractibly attached thereto under tension, and
intermediate regions respectively lying between the inner and outer end regions; and
the front and rear end portions of the crotch panel are respectively overlapped with and joined to the inner end regions of the front and rear waist panels.
(1.3) The crotch panel has a base sheet lying in a midsection as viewed in the transverse direction, and leg sheets lying on opposite sides of the base sheet so as to extend outwardly in the transverse direction beyond the absorbent structure.
(1.4) The leg sheets are disposed with leg elastics extending in the longitudinal direction and contractibly attached thereto under tension.
(1.5) The absorbent structure includes an absorbent core having front and rear end portions extending in the transverse direction, and lateral edge portions extending in the longitudinal direction, and a bodyside liner lying on the skin-facing surface of the absorbent core; and
the rear end portion of the absorbent core lies inboard of the rear end portion of the crotch panel as viewed in the longitudinal direction.
(1.6) The front end portion of the absorbent core lies outboard of the front end portion of the crotch panel as viewed in the longitudinal direction.
(1.7) The respective intermediate regions of the front and rear waist panels include, on the skin-facing surface, interior waist sheets formed of an elastic fibrous nonwoven fabric.
(1.8) A front end portion of the absorbent structure is attached to the skin-facing surface of the interior waist sheet of the front waist panel.
(1.9) The absorbent core is in contact with the interior waist sheet of the front waist panel.
(1.10) The front and rear waist panels include, on the non-skin-facing surface, exterior waist sheets, and a rear end portion of the absorbent structure is attached between the interior waist sheet and the exterior waist sheet of the rear waist panel.
(1.11) The interior waist sheets are configured to come in direct contact with a wearer's skin in the intermediate regions, during use of the wearing article, over a larger area than where the crotch panel overlapping with the intermediate regions is configured to come in contact with the wearer's skin.
(1.12) The leg sheets are not present outboard of the lateral edge portions of the absorbent structure in the transverse direction, in a region where the absorbent core extends outwardly beyond the front end portion of the crotch panel in the longitudinal direction.
Various embodiments in accordance with the disclosure of a second aspect may be arranged in at least one or more of the following features:
(2) A wearing article having a longitudinal direction, a transverse direction, and opposite skin-facing surface and non-skin-facing surface, the article including:
front and rear waist panels respectively defining front and rear waist regions;
a crotch panel defining a crotch region; and
an absorbent structure lying on the skin-facing surface of at least the crotch panel and extending in the longitudinal direction, wherein:
the crotch panel has front and rear end portions extending in the transverse direction and lateral edge portions extending in the longitudinal direction, wherein the front and rear end portions are respectively joined to the skin-facing surface of the front and rear waist panels;
the absorbent structure includes an absorbent core having front and rear end portions extending in the transverse direction, and lateral edge portions extending in the longitudinal direction;
the rear end portion of the absorbent core lies inboard of the rear end portion of the crotch panel as viewed in the longitudinal direction; and
the front end portion of the absorbent core lies outboard of the front end portion of the crotch panel as viewed in the longitudinal direction.
The present disclosure described above may include at least following embodiments, which may be taken in isolation or in combination with one another.
(2.1) The front and rear waist panels respectively have
outer end regions disposed with first and second waist elastics extending in the transverse direction and contractibly attached thereto under tension,
inner end regions provided with third and fourth waist elastics extending in the transverse direction and contractibly attached thereto under tension, and
intermediate regions respectively lying between the inner and outer end regions; and
the front and rear end portions of the crotch panel are respectively overlapped with and joined to the inner end regions of the front and rear waist panels.
(2.2) The respective intermediate regions of the front and rear waist panels include, on the skin-facing surface, interior waist sheets formed of an elastic fibrous nonwoven fabric; and
a front end portion of the absorbent structure is attached to the skin-facing surface of the interior waist sheet of the front waist panel.
(2.3) The absorbent core is in contact with the interior waist sheet of the front waist panel.
(2.4) The front and rear waist panels include, on the non-skin-facing surface, exterior waist sheets, and
a rear end portion of the absorbent structure is attached between the interior waist sheet and the exterior waist sheet of the rear waist panel.
(2.5) The interior waist sheets are configured to come in direct contact with a wearer's skin in the intermediate regions, during use of the wearing article, over a larger area than where the crotch panel overlapping with the intermediate regions is configured to come in contact with the wearer's skin.
(2.6) The crotch panel has
a base sheet lying in a midsection as viewed in the transverse direction, and
leg sheets lying on opposite sides of the base sheet so as to extend outwardly in the transverse direction beyond the absorbent structure;
the leg sheets are disposed with leg elastics extending in the longitudinal direction and contractibly attached thereto under tension; and
the leg sheets are not present outboard of the lateral edge portions of the absorbent structure in the transverse direction, in a region where the absorbent core extends outwardly beyond the front end portion of the crotch panel in the longitudinal direction.
In the wearing article according to one or more embodiments of the present invention, the dimension in the longitudinal direction of the crotch panel is set to be smaller than that of the absorbent structure so that each area over which the crotch panel overlaps with the front and rear waist panels may be reduced. In this way, breathability in the front and rear waist panels may be ensured.
Embodiments of the present invention are applicable to, for example, pull-on diapers, toilet-training pants and incontinent pants or the like.
This application claims the benefit of Japanese Application No. 2012-143516 the entire disclosure of which is incorporated by reference herein.

Claims (13)

  1. A wearing article having a longitudinal direction, a transverse direction, and opposite skin-facing and non-skin-facing surfaces, the article comprising:
    front and rear waist panels respectively defining front and rear waist regions;
    a crotch panel defining a crotch region; and
    an absorbent structure lying on the skin-facing surface of at least the crotch panel and extending in the longitudinal direction, wherein:
    the crotch panel has front and rear end portions extending in the transverse direction and lateral edge portions extending in the longitudinal direction, wherein the front and rear end portions are respectively joined to the skin-facing surface of the front and rear waist panels; and
    a dimension in the longitudinal direction of the crotch panel is smaller than a dimension in the longitudinal direction of the absorbent structure.
  2. The wearing article according to claim 1, wherein a dimension in the transverse direction of the crotch panel is larger than a dimension in the transverse direction of the absorbent structure, and the lateral edge portions of the crotch panel extend outwardly in the transverse direction beyond the absorbent structure.
  3. The wearing article according to claim 1 or 2, wherein:
    the front and rear waist panels respectively have
    outer end regions disposed with first and second waist elastics extending in the transverse direction and contractibly attached thereto under tension,
    inner end regions provided with third and fourth waist elastics extending in the transverse direction and contractibly attached thereto under tension, and
    intermediate regions respectively lying between the inner and outer end regions; and
    the front and rear end portions of the crotch panel are respectively overlapped with and joined to the inner end regions of the front and rear waist panels.
  4. The wearing article according to any one of claims 1 through 3, wherein the crotch panel has
    a base sheet lying in a midsection as viewed in the transverse direction, and
    leg sheets lying on opposite sides of the base sheet so as to extend outwardly in the transverse direction beyond the absorbent structure.
  5. The wearing article according to claim 4, wherein the leg sheets are disposed with leg elastics extending in the longitudinal direction and contractibly attached thereto under tension.
  6. The wearing article according to any one of claims 1 through 5, wherein:
    the absorbent structure includes
    an absorbent core having front and rear end portions extending in the transverse direction, and lateral edge portions extending in the longitudinal direction, and
    a bodyside liner lying on the skin-facing surface of the absorbent core; and
    the rear end portion of the absorbent core lies inboard of the rear end portion of the crotch panel as viewed in the longitudinal direction.
  7. The wearing article according to any one of claims 1 through 6, wherein the front end portion of the absorbent core lies outboard of the front end portion of the crotch panel as viewed in the longitudinal direction.
  8. The wearing article according to any of claims 3 through 7, wherein the respective intermediate regions of the front and rear waist panels include, on the skin-facing surface, interior waist sheets formed of an elastic fibrous nonwoven fabric.
  9. The wearing article according to claim 8, wherein a front end portion of the absorbent structure is attached to the skin-facing surface of the interior waist sheet of the front waist panel.
  10. The wearing article according to claim 9, wherein the absorbent core is in contact with the interior waist sheet of the front waist panel.
  11. The wearing article according to claim 9, wherein:
    the front and rear waist panels include, on the non-skin-facing surface, exterior waist sheets, and
    a rear end portion of the absorbent structure is attached between the interior waist sheet and the exterior waist sheet of the rear waist panel.
  12. The wearing article according to claim 8, wherein the interior waist sheets are configured to come in direct contact with a wearer's skin in the intermediate regions, during use of the wearing article, over a larger area than where the crotch panel overlapping with the intermediate regions is configured to come in contact with the wearer's skin.
  13. The wearing article according to claim 7, wherein the leg sheets are not present outboard of the lateral edge portions of the absorbent structure in the transverse direction, in a region where the absorbent core extends outwardly beyond the front end portion of the crotch panel in the longitudinal direction.

PCT/JP2013/003840 2012-06-26 2013-06-20 Wearing article WO2014002440A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201380034381.9A CN104427962B (en) 2012-06-26 2013-06-20 Wearing article

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012143516A JP6103834B2 (en) 2012-06-26 2012-06-26 Disposable wearing items
JP2012-143516 2012-06-26

Publications (1)

Publication Number Publication Date
WO2014002440A1 true WO2014002440A1 (en) 2014-01-03

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JP (1) JP6103834B2 (en)
CN (1) CN104427962B (en)
TW (1) TWI577357B (en)
WO (1) WO2014002440A1 (en)

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Also Published As

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CN104427962B (en) 2017-05-10
JP6103834B2 (en) 2017-03-29
TW201416065A (en) 2014-05-01
JP2014004258A (en) 2014-01-16
CN104427962A (en) 2015-03-18
TWI577357B (en) 2017-04-11

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