CN105705123B - Underpants type disposable absorbent article - Google Patents

Underpants type disposable absorbent article Download PDF

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Publication number
CN105705123B
CN105705123B CN201480061225.6A CN201480061225A CN105705123B CN 105705123 B CN105705123 B CN 105705123B CN 201480061225 A CN201480061225 A CN 201480061225A CN 105705123 B CN105705123 B CN 105705123B
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China
Prior art keywords
waist
region
elastic
end edge
absorbent core
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CN201480061225.6A
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Chinese (zh)
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CN105705123A (en
Inventor
泷野俊介
青木克文
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Unicharm Corp
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Unicharm Corp
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Publication of CN105705123A publication Critical patent/CN105705123A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—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
    • 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
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers

Abstract

The invention provides a pants-type disposable absorbent article capable of preventing leakage of excrement from a waist opening. The diaper (10) is of the pants type, and comprises a front waist region (14), a rear waist region (15), a crotch region (16) located between the front and rear waist regions, and an absorbent core (58) located at least in the crotch region, and is configured so that both side edges (18c, 18d, 19c, 19d) of the front and rear waist regions are joined to each other to define a waist opening (22) and a pair of leg openings (23). A spacing dimension (L1) in the longitudinal direction from the outer end edge (28b) of the leakproof sheet in the front waist region to the front opening end edge is larger than a spacing dimension (L2) in the longitudinal direction from the outer end edge (29b) of the leakproof sheet in the rear waist region to the rear opening end edge. The dimension (L3) of the interval in the longitudinal direction from the front end edge of the absorbent core to the front opening end edge is smaller than the dimension (L5) of the interval in the longitudinal direction from the rear end edge of the absorbent core to the rear opening end edge.

Description

Underpants type disposable absorbent article
Technical Field
The present invention relates to pants-type disposable absorbent articles such as disposable diapers, disposable toilet training pants, disposable incontinence pants, and the like.
Background
Conventionally, there has been known a pants-type disposable absorbent article having a longitudinal direction and a transverse direction perpendicular to the longitudinal direction, including a skin-facing surface and a non-skin-facing surface on the opposite side, a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, and an absorbent core located at least in the crotch region, and having a waist opening and a pair of leg openings defined by joining both side edge portions of the front and rear waist regions to each other. For example, patent document 1 discloses an absorbent article in which: the absorbent core extends in the longitudinal direction from the crotch region to the vicinity of the end of the waist opening to the front and rear waist regions, the front and rear waist regions include a liquid-permeable top sheet disposed on the skin-facing surface and a liquid-impermeable back sheet disposed on the non-skin-facing surface, the liquid-impermeable back sheet is extended in the longitudinal direction further than the liquid-permeable top sheet, and the extended portion of the liquid-impermeable sheet is folded back toward the skin-facing surface of the liquid-permeable top sheet at the end of the front and rear waist regions to fix the extended portion to the liquid-permeable sheet.
Prior art documents
Patent document
Patent document 1 Japanese Kokai publication Hei 03-122823
Disclosure of Invention
Problems to be solved by the invention
According to the absorbent article disclosed in patent document 1, since the extended portion of the liquid-impermeable sheet of the liquid-impermeable back sheet is folded back toward the skin-facing surface of the liquid-permeable top sheet to fix the extended portion to the liquid-permeable sheet, leakage of excrement from the vicinity of the end portions in the longitudinal direction of the front and rear waist regions can be suppressed.
However, infants who are not able to stand by themselves sleep in a supine posture for many times, and frequently excrete stool, and often excrete soft stool.
When the absorbent core is disposed so as to extend from the crotch region to the vicinity of the opening end edge forming a part of the waist opening toward the rear waist region as disclosed in patent document 1, the liquid-absorbent structure has high rigidity, and if this portion is contracted by the elongation stress of the elastic body, large wrinkles or bulges are formed, and the absorbent article does not come into close contact with the waist portion, so that a gap is formed between the waist portion of the wearer and the absorbent article, and there is a risk that excrement leaks from the opening end edge.
The present invention aims to provide a pants-type disposable absorbent article capable of preventing leakage of excrement from a waist opening by improving a conventional absorbent article.
Means for solving the problems
In order to solve the above-mentioned problems, a first invention is a pants-type disposable absorbent article having a longitudinal direction and a transverse direction orthogonal to the longitudinal direction, a skin-facing surface and a non-skin-facing surface on the opposite side of the skin-facing surface, the absorbent article including a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, and an absorbent core located at least in the crotch region, wherein both side edge portions of the front and rear waist regions are joined to each other to define a waist opening and a pair of leg openings, the pants-type disposable absorbent article being characterized in that the front waist region includes a front opening end edge defining a part of the waist opening, a front waist holding region stretchable in the waist circumferential direction and located on the front opening end edge side, and a leakproof sheet located on the non-skin-facing surface side of the absorbent core, and the rear waist region includes a rear opening end edge defining a part of the waist opening, a leakproof sheet located on the non, A rear waist holding region which is stretchable in a waist circumferential direction and is located on the rear open end edge side, and the leakproof sheet is located on the non-skin-opposed surface side of the absorbent core, wherein a dimension in the longitudinal direction from an outer end edge of the leakproof sheet in the front waist region to the front open end edge is larger than a dimension in the longitudinal direction from an outer end edge of the leakproof sheet in the rear waist region to the rear open end edge, and a dimension in the longitudinal direction from the front end edge of the absorbent core to the front open end edge is smaller than a dimension in the longitudinal direction from the rear end edge to the rear open end edge of the absorbent core.
In order to solve the above-mentioned problems, a second aspect of the present invention is a pants-type disposable absorbent article having a longitudinal direction and a transverse direction orthogonal to the longitudinal direction, a skin-facing surface and a non-skin-facing surface on the opposite side of the skin-facing surface, the article including a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, and an absorbent core located at least in the crotch region, wherein both side edges of the front and rear waist regions are joined to each other to define a waist opening and a pair of leg openings, the article being characterized in that the rear waist region includes an opening edge forming a part of the waist opening, a waist stretchable region stretchable in the waist circumferential direction, a sheet forming the waist stretchable region, and a leakage-preventing sheet located on the non-skin-facing surface side of the absorbent core, the leakage-preventing sheet extending further toward the opening edge than the rear edge of the absorbent core, the waist stretch region is formed at least between the rear end edge and the opening end edge of the absorbent core, and a dimension in a longitudinal direction of a portion extending from the rear end edge to the opening end edge of the absorbent core is larger than a dimension in the longitudinal direction of the absorbent core in the rear waist region.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the pants-type disposable absorbent article including one or more embodiments of the first disclosed invention, since the dimension of the interval in the longitudinal direction from the front opening edge to the front edge of the absorbent core is smaller than the dimension of the interval in the longitudinal direction from the rear opening edge to the rear edge of the absorbent core, the rear waist region of the absorbent article can be attached to the back of the wearer while preventing the rear waist holding region from being separated from the skin of the wearer due to the rigidity of the absorbent core. Further, the dimension of the gap in the longitudinal direction from the outer end edge of the leakproof sheet in the front waist region to the front opening end edge is larger than the dimension of the gap in the longitudinal direction from the outer end edge of the leakproof sheet in the rear waist region to the rear opening end edge, so that leakage of excrement from the opening end edge of the rear waist region can be suppressed.
According to the pants-type disposable absorbent article including one or more embodiments of the second disclosed invention, since the dimension in the longitudinal direction of the portion extending from the rear end edge of the absorbent core toward the open end edge is larger than the dimension in the longitudinal direction of the absorbent core in the rear waist region, it is possible to suppress the waist stretchable region from being separated from the skin of the wearer due to the rigidity of the absorbent core, to fit the rear waist region of the absorbent article to the back of the wearer, and to suppress the leakage of excrement from the open end edge of the rear waist region.
Drawings
The drawings show specific embodiments of the present invention, but are not all indispensable structures of the invention, but include alternative and preferred embodiments.
Fig. 1 is a perspective view of a pants-type disposable diaper according to a first embodiment showing an example of a pants-type disposable absorbent article according to the present invention.
FIG. 2 is a partially broken, developed plan view of the diaper with the elastics stretched longitudinally and transversely to their maximum extension (to the extent that the folds produced by the contraction action of the elastics disappear).
Fig. 3 is a partially broken exploded perspective view of the diaper.
Fig. 4 is a schematic sectional view taken along line IV-IV of fig. 2.
Fig. 5 is a schematic sectional view taken along line V-V of fig. 2.
Fig. 6(a) is a partially broken enlarged view of the rear waist region, and fig. 6(b) is a partially broken enlarged view of the front waist region.
Fig. 7 is a perspective view of the diaper in a worn state as viewed from the front.
Fig. 8 is a perspective view of the diaper in a worn state as viewed from the back.
Fig. 9 is a schematic sectional view similar to fig. 4 of the diaper of the second embodiment.
Fig. 10 is a schematic sectional view similar to fig. 5 of the diaper of the second embodiment.
Fig. 11 is a partially broken developed plan view similar to fig. 2 of the diaper of the third embodiment.
Fig. 12 is a perspective view similar to fig. 8 of the diaper of the third embodiment.
Fig. 13 is a schematic sectional view similar to fig. 4 of the diaper of the fourth embodiment.
Fig. 14 is a schematic sectional view similar to fig. 5 of the diaper of the fourth embodiment.
Detailed Description
The following embodiments relate to underpants type disposable diapers shown in fig. 1 to 14, but are not all indispensable to the present invention, and include alternative and preferable configurations.
< first embodiment >
Referring to fig. 1 to 3, the diaper 10 has a longitudinal axis P and a transverse axis Q, a longitudinal direction Y and a transverse direction X, and a skin-facing surface and a non-skin-facing surface on the opposite side, and includes an annular elastic waist sheet 12 extending in the waist direction, a liquid-absorbent structure 11 connected to the skin-facing surface of the elastic waist sheet 12, and an elastic crotch sheet 13 attached to the skin-facing surface side of the elastic waist sheet 12. In addition, the diaper 10 has a front waist region 14, a rear waist region 15, and a crotch region 16 located between the front and rear waist regions 14 and 15, and is symmetrical with respect to the longitudinal axis P.
< elastic waist piece >
The elastic waist panel 12 has an elastic belt function for fixing the liquid-absorbent structure 11 to the crotch of the wearer, and has a front waist panel 18 forming the front waist region 14 and a rear waist panel 19 forming the rear waist region 15. The front waist panel 18 has a horizontally oblong shape defined by an inner end edge 18a, an outer end edge 18b, and both side edges 18c and 18d between the inner and outer end edges 18a and 18 b. The rear waist panel 19 has a horizontally oblong shape defined by an inner end edge 19a, an outer end edge 19b, and both side edges 19c and 19d between the inner and outer end edges 19a and 19 b. The side edges 18c, 18d of the front waist panel 18 and the side edges 19c, 19d of the back waist panel 19, which correspond to each other, are overlapped with each other and joined at the seams 20 arranged intermittently in the longitudinal direction Y by a known means, for example, thermal embossing/embossing, or thermal fusion by sound waves or the like, thereby defining the waist opening 22 and the pair of leg openings 23. The waist opening 22 is formed by a front opening end edge 22a on the front waist panel 18 and a rear opening end edge 22b on the rear waist panel 19. In the present invention, the diaper 10 in which the waist opening 22 overlaps with each other so that the upper end of the front waist panel 18 is aligned with the upper end of the rear waist panel 19 and the lower end of the front waist panel 18 is aligned with the lower end of the rear waist panel 19 is included, and the diaper in which the upper and lower ends of one of the front and rear waist panels 18, 19 protrude in the upper and lower directions with respect to the upper and lower ends of the other of the front and rear waist panels 18, 19 is not included. However, the upper and lower end portions of the front and rear waist panels 18 and 19 are aligned with each other, and this includes a case where the upper and lower end portions are slightly shifted from each other in the vertical direction due to a manufacturing error. The term "slightly offset" as used herein means that the upper end portions and the lower end portions of the front and rear waist panels 18 and 19 are offset from each other by 10mm or less in the longitudinal direction Y in the production of the diaper 10. In the present invention, the front and rear waist regions 14 and 15 are portions whose both side edge portions are connected by the seam 20, and the inner end edges 18a and 19a are lower ends of the connecting portions where the seam 20 is located, and are not portions located on the crotch region 16 side apart from the connecting portions.
The front and rear waist panels 18 and 19 have waist inner layers (waist inner layer sheets) 24 and 25 on the skin-facing surface side and waist outer layers (waist outer layer sheets) 26 and 27 on the non-skin-facing surface side, respectively. The waist outer layers 26, 27 have a width dimension in the longitudinal direction Y greater than that of the waist inner layers 24, 25, and extend further outward in the longitudinal direction Y from the outer end edges 24a, 25a of the waist inner layers 24, 25.
< waist outer layer >
For the waist outer layers 26, 27, a mass of about 15-30 g/m can be used2SMS (spunbond, meltblown, spunbond) fiber nonwoven fabric, spunbond nonwoven fabric, hot air nonwoven fabric, plastic sheet, or a laminated sheet of the arbitrary fiber nonwoven fabric and the plastic sheet. The waist inner layers 24 and 25 and the waist outer layers 26 and 27 are joined by a suitable adhesive applied to at least one of the inner surfaces, such as a hot melt adhesive or a known hot melt means.
< inner layer of waist >
The waist inner layers 24 and 25 can be formed using elastic fiber nonwoven fabrics, for example, spun bond fiber nonwoven fabrics, melt blown fiber nonwoven fabrics, hot roll fiber nonwoven fabrics, SMS fiber nonwoven fabrics, air-laid fiber nonwoven fabrics, and air-through fiber nonwoven fabrics, which are well-known fibers having elasticity, alone or in combination. The elastic nonwoven fabric can be formed of, for example, an elastic resin such as polyethylene and polyurethane, or a thermoplastic resin such as polyethylene, polypropylene, polyester, and propylene. As the waist inner layers 24 and 25, a non-elastic fiber nonwoven fabric can be used, but as described later, since the waist inner layer 25 of the rear waist region 15 is a portion that directly contacts the body of the wearer, it is preferable that at least the waist inner layer 25 is an elastic fiber nonwoven fabric for the purpose of improving softness and skin touch.
< leakproof sheet >
Referring to fig. 2 and 3, front and rear leakproof sheets 28, 29 are arranged between the waist inner layers 24, 25 and the waist outer layers 26, 27, at the center portions in the transverse direction X of the front and rear waist regions 14, 15, between the waist outer layers 26, 27 and the reinforcing layer 30. Referring to fig. 4 and 5, the outer end edges 28b, 29b of the front and rear leakproof sheets 28, 29 extend further toward the front and rear opening end edges 22a, 22b than the front and rear end flaps 54a, 55a of the liquid-absorbent structure 11. The inner edges 28a, 29a of the front and rear leakage preventing sheets 28, 29 extend toward the crotch region 16 side than the front and rear edges 58a, 58b of the absorbent core 58. It is preferable that the non-skin-facing surfaces of the front and back leakproof sheets 28, 29 are printed with a pattern (not shown) that can be visually recognized from the outside.
The front and rear leakproof sheets 28 and 29 may be formed of a liquid-impermeable and moisture-permeable sheet made of a plastic material such as a polyethylene film or a polypropylene film, or may be formed of a nonwoven fabric of fibers treated with, for example, a water repellent in order to improve the liquid permeability.
Referring to fig. 6(a), (b), the interval L1 in the longitudinal direction Y from the outer end edge 28b of the front leakage preventive sheet 28 of the front waist region 14 to the front opening end edge 22a is larger than the interval L2 in the longitudinal direction Y from the outer end edge 29b of the rear leakage preventive sheet 29 of the rear waist region 15 to the rear opening end edge 22 b. The spacing dimension L1 is, for example, 10 to 50mm, and the spacing dimension L2 is, for example, 1 to 30 mm.
< waist elastic bodies >
Referring to fig. 4 and 5, the extending portions of the waist outer layers 26, 27 extending outward in the longitudinal direction Y from the outer end edges 24a, 25a of the waist inner layers 24, 25 of the front and rear waist panels 18, 19 are folded back toward the skin-facing surface side. In the folded portions 26a, 27a formed by folding back, the plurality of front and rear waist elastic bodies 31, 32 are contractibly fixed in an extended state via an appropriate adhesive, for example, a hot-melt adhesive. Further, between the waist outer layers 26, 27 and the liquid-absorbent structure 11, an elongated reinforcing layer 30 formed of a fibrous nonwoven fabric and front and rear leakproof sheets 28, 29 are disposed. Between the reinforcing layer 30 and the front and rear leakproof sheets 28 and 29, a plurality of front and rear waist elastic members 33 and 34 and front and rear waist elastic members 35 and 36 are contractibly fixed in an extended state by a suitable adhesive, for example, a hot melt adhesive.
< front waist region >
The front waist region 14 has a front waist outer elastic region 37 located on the front opening end edge 22a side, a front waist inner elastic region 38 located on the crotch region 16 side, and a front waist inner elastic region 39 located between the front waist outer elastic region 37 and the front waist inner elastic region 38. The absorbent core 58 is not contained in the front waist outer elastic region 37, and a part of the absorbent core 58 is contained in the front waist middle elastic region 39 and the front waist inner elastic region 38.
The front waist region 14 has a front waist stretch region 49a formed between the front end edge 58a of the absorbent core 58 and the front opening end edge 22 a.
The front waist outer elastic region 37 has a plurality of front waist elastic bodies 31, the plurality of front waist elastic bodies 31 being separated from each other by a certain dimension in the longitudinal direction Y and extending in the transverse direction X, for example, in a linear, string or strand shape.
The front waist elastic region 39 has a plurality of front waist elastics 33, the plurality of front waist elastics 33 being separated from each other by a specified dimension in the longitudinal direction Y and extending in the transverse direction X, for example, in a linear, string, or strand shape.
The front waist inner elastic region 38 has a plurality of front waist elastic bodies 35, the plurality of front waist elastic bodies 35 being separated from each other by a certain dimension in the longitudinal direction Y and extending in the transverse direction X, for example, in a linear, string or strand shape. Instead of arranging the linear, string-like, or string-like waist elastic members 31, 33, and 35, elastic sheets may be arranged to impart elasticity to the front waist outer elastic region 37, the front waist inner elastic region 38, and the front waist elastic region 39.
< rear waist region >
The rear waist region 15 has a rear waist outer elastic region 40 located on the rear opening end edge 22b side, a rear waist inner elastic region 41 located on the crotch region 16 side, and a rear waist middle elastic region 42 located between the rear waist outer elastic region 40 and the rear waist inner elastic region 41. The absorbent core 58 is not included in the rear waist outer elastic region 40, and the rear waist elastic region 42, although not including the absorbent core 58, is adjacent to the rear end edge 58b of the absorbent core 58 and includes a part of the absorbent core 58 in the rear waist inner elastic region 41.
The rear waist outer elastic region 40 has a plurality of rear waist elastic bodies 32 therein, the plurality of rear waist elastic bodies 32 being separated from each other in the longitudinal direction Y by a certain dimension and extending in the transverse direction X, for example, in a string shape, a string shape or a strand shape.
The rear waist elastic region 42 has a plurality of rear waist elastic bodies (rear waist elastic bodies) 34 therein, the plurality of rear waist elastic bodies 34 being separated from each other by a certain dimension in the longitudinal direction Y and extending in the transverse direction X, for example, in a linear, string, or strand shape. The rear waist elastic member 34 is disposed on the non-skin-facing surface side of the liquid-absorbent structure 11.
The rear waist inner elastic region 41 has a plurality of rear waist elastic bodies 36 therein, the plurality of rear waist elastic bodies 36 being separated from each other in the longitudinal direction Y by a certain dimension and extending in the transverse direction X, for example, in a linear, string or strand shape. Instead of arranging the linear, string-like, or string-like waist elastic members 32, 34, and 36, for example, elastic sheets may be arranged to impart elasticity to the rear waist outer elastic region 40, the rear waist inner elastic region 41, and the rear waist middle elastic region 42.
Waist elastic body
The extension stress in the transverse direction X of the front and rear waist outer elastic regions 37, 40 is set to be greater than the extension stress in the transverse direction X of the front and rear waist elastic regions 39, 42. In the present embodiment, the front and rear waist elastic members 31 and 32 are members in which an elastic member having a fineness of 470 to 940dtex, for example, a string-like, strand-like or string-like shape, is attached to be stretchable by about 1.6 to 3.5 times. The front and rear waist elastic members 33, 34 are members formed by retractably attaching elastic members having a fineness of 310 to 780dtex, for example, in the form of threads, strings or strands, while being extended by about 1.8 to 2.8 times. By setting the fineness and the extension ratio of the front and rear waist elastic bodies 31, 32 to be larger than those of the front and rear waist elastic bodies 33, 34 in this way, the extension stress of the front and rear waist outer elastic regions 37, 40 can be made larger than that of the front and rear waist elastic regions 39, 42.
Specifically, the front and back waist outer elastic regions 37, 40 have an elongation stress at 171% at maximum elongation of about 0.7 to 1.7N/mm, and the front and back waist inner elastic regions 39, 42 have an elongation stress at 171% at maximum elongation of about 0.4 to 1.4N/mm. In this way, the front and rear waist outer elastic regions 37 and 40 have relatively large extension stress and stably fit to the body of the wearer, and therefore, even if the extension stress of the leg elastic regions 62 is set relatively low, downward displacement of the diaper 10 can be prevented. The extension stress of the front and rear waist outer elastic regions 37, 40 may be made equal to the extension stress of the front and rear waist elastic regions 39, 42.
The difference in the set elongation stress is not limited to the case of using materials having different fineness and elongation ratio of the elastic body. This can also be achieved, for example, by: forming an elastomer from different materials; and forming the elastic bodies from the same material and providing a difference in the spaced distance of the elastic bodies from each other in each elastic region. Of course, the desired elongation stress in each elastic region can be set by appropriately combining the material used, the fineness and elongation ratio of the elastic body, and the distance between the elastic bodies.
< method for measuring elongation stress >
The elongation stress in the front and rear waist outer and inner elastic regions 37 to 40 was measured by the following method using a tensile tester (INSTRON model 5564) manufactured by INSTRON japan ltd (japanese: インストロンジャパンカンパニーリミテッド). First, in a tensile testing machine, the dimension R of the gap between a pair of upper and lower chucks (clamps) was set to the same size as the dimension X of the diaper in the natural state (the distance between the side seam portions in the waist region), and the measurement was performed under the conditions of the cycle mode and the tensile speed of 100 mm/min.
Then, a measurement sample having a length dimension in the transverse direction X of 3 to 5cm is cut out from the diaper 10 so as not to include the liquid-absorbent structure 11, the measurement sample is stretched in the transverse direction X until the state where wrinkles due to the contraction force of each waist elastic body disappear, and the dimension between the seams 20 at both side edge portions in this state is defined as a dimension R1 at maximum elongation (not shown). In addition, the test specimen used in this maximum dimension R1 was not used for the determination of the elongation stress. Then, both side edge portions of the sample cut out from the diaper 10 are fixed to the upper and lower chucks, respectively. In this state, the sample is pulled in the vertical direction so that the upper and lower chucks are separated from each other until the sample is elongated to a desired length.
The dimension R1 at the maximum elongation measured in advance was defined as 100%. The sample was elongated until the distance between the chucks R was about 87% of the maximum distance between the chucks R1. Then, the sample stretched to about 87% of the maximum dimension R1 was gradually contracted, and the elongation stress at a distance of about 71% between the upper and lower chucks was measured, and the value per unit width (about 30mm) calculated based on the width of the sample was used as the measured value (N/30 mm).
The front and rear waist elastic members 35 and 36 included in the front and rear waist inner elastic regions 38 and 41 are members formed by retractably attaching elastic members having a fineness of about 310 to 620dtex, for example, in the form of threads, strings, or strands, while being extended by about 1.1 to 3.5 times. The front and rear waist inner elastic regions 38, 41 have an elongation stress of about 0.2 to 1.2N/mm at a maximum elongation of 171%. The extension stress of the front and rear waist inner elastic regions 38, 41 was measured in the same manner as the extension stress of the front and rear waist outer elastic regions 37, 40 and the front and rear waist elastic regions 39, 42 by cutting a sample of about 30mm from the front and rear waist sheets 18, 19.
By making the fineness and the elongation ratio of the front and rear waist elastic bodies 31, 32 larger than those of the front and rear waist elastic bodies 35, 36, the extension stress (tensile strength) of the front and rear waist inner elastic regions 38, 41 can be made lower than that of the front and rear waist outer elastic regions 37, 40.
By making the fineness and the elongation ratio of the front and rear waist elastic members 33, 34 larger than those of the front and rear waist elastic members 35, 36, the extension stress (tensile strength) of the front and rear waist inner elastic regions 38, 41 can be made lower than that of the front and rear waist elastic regions 39, 42.
In the diaper, when a plurality of waist elastic members are provided from the vicinity of the absorbent core to the opening end edge side of the waist opening, the waist elastic members positioned in the vicinity of the absorbent core are less likely to contract due to the relatively high rigidity of the liquid-absorbent structure, and the waist elastic members positioned on the opening end edge side exert a required contraction force, so that the lateral dimension of the region on the opening end edge side is reduced, and the front and rear waist panels are fitted to the body of the wearer. In the present embodiment, the front and rear waist outer elastic regions 37, 40 do not include the absorbent core 58, and the front and rear waist outer elastic regions 37, 40 are formed between the front and rear end edges 58a, 58b and the front opening end edges 22a, 22b of the absorbent core 58, so that the front and rear waist elastic bodies 31 to 34 are stretched with little influence of the rigidity of the absorbent core 58 on the front and rear waist elastic bodies 31 to 34. Therefore, the front and rear waist outer elastic regions 37, 40 on which the front and rear waist elastics 31 to 34 are disposed have a dimension in the waist circumferential direction smaller than the dimension in the waist circumferential direction at the front and rear end edges 58a, 58b of the absorbent core 58, and therefore the front and rear waist outer elastic regions 37, 40 are fitted to the body of the wearer. In particular, since the front and rear waist outer elastic regions 37 and 40 expand and contract with respect to the irregularities of the back of the wearer, the occurrence of a gap between the back and the rear waist panel 19 is suppressed, and leakage of excrement from the rear opening end edge 22b of the rear waist region 15 can be suppressed. The same is true in the front waist region 14.
The front and rear waist elastics 31 to 34 extend continuously in the transverse direction X in the front and rear waist outer elastic regions 37, 40 and the front and rear waist elastic regions 39, 42, so that these front and rear waist elastics 31 to 34 are continuous in the waist circumferential direction. Therefore, in the front and rear waist outer elastic regions 37, 40 and the front and rear waist elastic regions 39, 42 of the front and rear waist panels 18, 19, the diaper 10 can be pressed against the wearer from the entire circumference of the waist, and the diaper 10 can be fitted to the body of the wearer.
In the front waist inner elastic region 38 of the front waist region 14, the front waist elastic body 35 is not positioned at the center of the liquid-absorbent structure 11 in the lateral direction X, and there is no risk that the contraction force thereof acts on the liquid-absorbent structure 11 to cause wrinkles, which cause leakage of body fluid.
In the rear waist inner elastic region 41 of the rear waist region 15, the rear waist elastic member 36 is not positioned at the center of the liquid-absorbent structure 11 in the lateral direction X, and there is no risk that the contraction force thereof acts on the liquid-absorbent structure 11 to cause wrinkles, which cause leakage of body fluid.
The elastic waist sheet 12 has a waist holding region 51a extending in the longitudinal direction Y by a predetermined length L9 from the opening end edge 22a of the front waist sheet 18 toward the crotch region 16, and a waist center region 51b extending in the longitudinal direction Y by a predetermined length L10 from the lower end edge of the waist holding region 51a toward the crotch region 16 and adjacent to the waist holding region 51a (see fig. 1, 4, and 5).
The waist holding region 51a is a region formed between the front end edge 58a and the front opening end edge 22a of the absorbent core 58 in the front waist sheet 18 and set according to the length dimension L9 in the longitudinal direction Y, and is a region set according to the length dimension L9 from the rear opening end edge 22b toward the crotch region 16 side in the rear waist sheet 19. The longitudinal Y length dimension L9 of the waist holding region 51a is equal to the longitudinal dimension of the waist central region 51b, for example.
Specifically, the length dimension L9 is 10 to 60mm, and the length dimension L10 is 10 to 60 mm.
The waist holding region 51a is formed by the front waist holding region 49b on the front waist panel 18 side and the rear waist holding region 50b on the rear waist panel 19 side. The front waist holding region 49b and the front waist stretching region 49a are the same region.
The front waist holding region 49b is configured by laminating the waist inner layer 24, the waist outer layer 26, the reinforcing layer 30, the front leakproof sheet 28, the body-side liner 59 of the liquid-absorbent structure 11, the outer cover 60 and the leakproof sheet 61 without including the absorbent core 58. Therefore, a part of the front waist holding region 49b has a portion configured by stacking 7 sheets. In addition, the front waist holding region 49b includes, for example, 3 front waist elastomers 31 and 1 front waist elastomer 33.
In the rear waist region 15, the rear waist holding region 50b set to the length dimension L9 from the rear opening end edge 22b includes, for example, 6 front waist elastic members 32, and is configured by laminating the waist inner layer 25, the waist outer layer 27, and the rear leakproof sheet 29 without including the absorbent core 58, the bodyside liner 59, the outer cover 60, the leakproof sheet 61, and the reinforcing layer 30 of the liquid absorbent structure 11. Therefore, the rear waist holding region 50b has a portion configured by stacking 4 sheets. Therefore, the rear waist holding region 50b has a portion in which the number of sheets constituting the front waist holding region 49b is smaller than the number of sheets constituting the rear waist holding region 50 b. Therefore, the thickness dimension of the rear waist holding region 50b of the rear waist panel 19 can be made smaller than the thickness dimension of the front waist holding region 49b of the front waist panel 18, so that the rear waist panel 19 can be strongly pressed against the body of the wearer, while the front waist panel 18 can be pressed in the front waist region 14 so as not to apply an excessive force to the body of the wearer. The above-described action and effect can also be achieved by: the front and rear waist panels 18 and 19 are formed such that the mass per unit area of the sheet forming the rear waist holding region 50b is smaller than the mass per unit area of the sheet forming the front waist holding region 49 b.
The waist center region 51b is disposed adjacent to the front waist holding region 49b so as to extend from the lower edge of the front waist holding region 49b to the crotch region 16 by a predetermined length L10 in the longitudinal direction Y in the front and rear waist panels 18 and 19. Thus, the waist central region 51b is formed by the front waist central region 49c and the rear waist panel 19 which are located at the same position in the longitudinal direction Y.
The front waist central region 49c is formed to include, for example, a part of the front end edge 58a of the absorbent core 58 and 1 front waist elastic body 33.
The rear waist central region 50c is formed so as to include, for example, 1 rear waist elastic body 34 without including the absorbent core 58.
Since the fineness and the elongation ratio of the front and rear waist elastic bodies 31, 32 are set to be larger than those of the front and rear waist elastic bodies 33, 34 as described above, the waist-surrounding elongation stress of the front and rear waist holding regions 49b, 50b per unit length in the longitudinal direction Y can be made larger than the waist-surrounding elongation stress of the front and rear waist central regions 49c, 50c per unit length in the longitudinal direction Y.
Therefore, in the front and rear waist holding regions 49b, 50b in which the extension stress is large, the front and rear waist panels 18, 19 are stably fitted to the body of the wearer, so the extension stress of the front and rear waist central regions 49c, 50c can be set relatively small, and the extension stress of the leg elastic regions 62 can be set relatively small. Therefore, even if the extension stress of the leg elastic region 62 is low, the diaper 10 can be prevented from being displaced downward.
< crotch part piece >
The elastic crotch panel 13 is formed of a liquid-impermeable crotch sheet 44. As the crotch sheet 44, a single-layer or multi-layer sheet member formed of various known fibrous nonwoven fabrics or moisture-permeable plastic films can be used.
The elastic crotch panel 13 has front and rear end portions 46, 47 and an intermediate portion 48 located between the front and rear end portions 46, 47. The front and rear end portions 46, 47 are fixed to the skin-facing surfaces on the side of the inner end edges 18a, 19a of the front and rear waist panels 18, 19 via joining regions to which hot melt adhesive is applied, the joining regions being located on the non-skin-facing surfaces. The intermediate portion 48 is fixed to the liquid-absorbent structure 11 positioned on the skin-facing surface side.
< liquid-absorbing Structure >
The liquid-absorbent structure 11 has an elongated pad shape including front and rear end portions 54 and 55, an intermediate portion 56, an absorbent core 58 extending in the longitudinal direction Y at least in the crotch region 16, a body-side liner (topsheet) 59 positioned on the skin-facing surface side of the absorbent core 58, an outer cover (backsheet) 60 positioned on the non-skin-facing surface side of the absorbent core 58, and a leakproof sheet 61 positioned on the non-skin-facing surface side of the outer cover 60. A suitable adhesive, such as a hot melt adhesive, is applied to substantially the entire non-skin-facing surface of the liquid-absorbent structure 11 in a known pattern. The front and rear end portions 54, 55 are fixed to the skin-facing surfaces of the front and rear waist sheets 18, 19 via the adhesive, respectively, and the intermediate portion 56 is fixed to the skin-facing surface of the elastic crotch sheet 13 via the adhesive. As shown in fig. 3, the front end portion 54 of the liquid-absorbent structure 11 is fixed to the skin-facing surface of the waist inner layer 24 of the front waist sheet 18, and the rear end portion 55 is fixed to the skin-facing surface of the waist outer layer 27 between the waist inner layer 25 and the waist outer layer 27 of the rear waist sheet 19. The front end portion 54 of the liquid-absorbent structure 11 is fixed to the skin-facing surface of the waist inner layer 24, so that the relatively soft waist inner layer 24 having elasticity is in direct contact with the skin of the wearer, and the skin feel is improved. Further, since the rear end portion 55 is fixed between the waist inner layer 25 and the waist outer layer 27, even if the excreted body fluid diffuses from the crotch region 16 to the rear end portion 55 of the liquid-absorbent structure 11 positioned in the rear waist region 15, the body fluid can be prevented from directly contacting the skin of the wearer.
The mass of the absorbent core 58 is about 300 to 900g/m2The core material is composed of a mixture of wood fluff pulp, super absorbent polymer particles (SAP), and optionally heat-fusible artificial fibers, and a liquid-permeable fiber nonwoven fabric (not shown) covering the core material. The body-side pad 59 can have a mass of about 10 to 30g/m2And various known fibrous nonwoven fabrics such as liquid-permeable spunbond nonwoven fabrics and SMS nonwoven fabrics. The outer coating layer 60 can have a mass of about 10 to 30g/m2The nonwoven fabric of (2) can be a liquid-impermeable spunbonded nonwoven fabric, an SMS nonwoven fabric, a moisture-permeable plastic sheet, or a laminate of a fiber nonwoven fabric and a plastic sheet.
The absorbent core 58 extends continuously in the longitudinal direction Y, and the rear end edge 58b is disposed below the front end edge 58a in the longitudinal direction Y.
The front end 54 of the liquid-absorbent structure 11 has a front end flap 54a formed of a body-side liner 59, an outer cover 60, and a leakproof sheet 61. The rear end portion 55 of the liquid-absorbent structure 11 has a rear end flap 55a formed of the body-side liner 59, the outer cover 60, and the leakproof sheet 61.
Referring to fig. 6(a), in the longitudinal direction Y, a spacing dimension L3 in the longitudinal direction Y from the front end edge 58a of the absorbent core 58 to the front opening end edge 22a is smaller than a longitudinal dimension L4 of the absorbent core 58 in the front waist region 14.
Referring to fig. 6(b), the dimension L5 in the longitudinal direction Y of the portion extending from the rear end edge 58b of the absorbent core 58 toward the rear opening end edge 22b side is larger than the dimension L6 in the longitudinal direction Y of the absorbent core 58 in the rear waist region 15.
The interval L3 in the longitudinal direction Y from the front end edge 58a of the absorbent core 58 to the front opening end edge 22a in the front waist region 14 is smaller than the interval L5 in the longitudinal direction Y from the rear end edge 58b of the absorbent core 58 to the rear opening end edge 22b in the rear waist region 15.
In this diaper 10, since the dimension L5 in the longitudinal direction of the portion extending from the rear end edge 58b of the absorbent core 58 toward the rear opening end edge 22b side is larger than the dimension L6 in the longitudinal direction Y of the absorbent core 58 in the rear waist region 15, the length dimension in the longitudinal direction Y of the absorbent core 58, which is relatively high in rigidity in the rear waist region 15, can be made small, and the length dimension in the longitudinal direction Y (L5 (see fig. 6)) of the rear waist stretchable region 50a, in which the absorbent core 58 is not present, can be made large in the rear waist region 15. Therefore, as shown in fig. 8, since the area of the rear waist stretchable region 50a where the absorbent core 58 is not present is increased, a gap is not generated between the concave portion of the wearer's back and the rear waist stretchable region 50a of the rear waist sheet 19, and leakage of excrement from the rear opening end edge 22b of the waist opening 22 can be prevented.
The abdomen of the wearer's waist is projected outward, and the back is depressed inward. When the diaper is worn by a wearer, a force is applied to the front and rear waist panels of the diaper in a direction projecting outward, but the front and rear waist panels are pressed against the waist by contraction force of the waist elastic member or the like. In this diaper 10, since the interval L3 in the longitudinal direction Y from the front end edge 58a to the front opening end edge 22a of the absorbent core 58 is smaller than the interval L5 in the longitudinal direction Y from the rear end edge 58b to the rear opening end edge 22b of the absorbent core 58 (see fig. 6), as shown in fig. 7 and 8, the length L4 in the longitudinal direction Y of the absorbent core in the front waist region 14 can be made larger than the length L6 in the longitudinal direction Y of the absorbent core in the rear waist region 15, and the rigidity of the front waist sheet 18 against the abdomen can be made relatively large, while the rigidity of the rear waist sheet 19 against the back can be made relatively small. Therefore, the front waist panel 18 having relatively high rigidity can be pressed weakly toward the abdomen on the abdomen side protruding outward, while the rear waist panel 19 having relatively low rigidity can be pressed strongly by the rear waist elastic members 32, 34, and 36 on the back side having a portion recessed inward. In the diaper 10, the front and rear waist sheets 18 and 19 are pressed against the wearer by making the rigidity of the front waist sheet 18 and the rigidity of the rear waist sheet 19 different from each other in consideration of the unevenness of the waist, and therefore, the diaper 10 can be prevented from being displaced downward with respect to the waist of the wearer. In addition to this effect, since the interval L1 in the longitudinal direction Y from the outer end edge 28b of the front leakage preventive sheet 28 of the front waist region 14 to the front opening end edge 22a is larger than the interval L2 in the longitudinal direction Y from the outer end edge 29b of the rear leakage preventive sheet 29 of the rear waist region 15 to the rear opening end edge 22b, the length in the longitudinal direction Y of the rear leakage preventive sheet 29 in the rear waist region 15 can be made larger, and therefore leakage of excrement from the rear opening end edge 22b of the waist opening 22 can be reliably prevented.
< various sizes of diaper >
Referring to FIG. 2, preferably, the diaper 10 has a dimension L11 in the longitudinal direction Y of about 350 to 600mm, the diaper 10 has a dimension W1 in the transverse direction X of about 300 to 430mm, the crotch region 16 has a dimension L12 in the longitudinal direction Y of about 180 to 300mm, and the side edge 18d of the front waist region 14 has a dimension L13 in the longitudinal direction Y (which is the same as the dimension in the longitudinal direction Y of the side edge 19d of the rear waist region 15) of about 60 to 130 mm.
< elastic side flap >
Referring to fig. 2 and 3, the elastic crotch panel 13 further has a pair of elastic side flaps 43 positioned on the outer sides in the transverse direction X from both side edges of the liquid-absorbent structure 11. The elastic side flaps 43 are formed by bending portions formed by bending both sides of the crotch sheet 44 and a plurality of leg elastic bodies 52 arranged in the bent portions, extending in the longitudinal direction Y, and formed in a string or a bundle. The front and rear end portions of the elastic side flaps 43 (parts of the front and rear end portions 46 and 47 of the elastic crotch panel 13) are fixed in the outward direction in the lateral direction X. The elastic side flap 43 has an inelastic region 63 disposed on the side edge 11c of the liquid-absorbent structure 11 and a leg elastic region 62 disposed on the outer side of the inelastic region 63 in the transverse direction X and having a leg elastic body 52 disposed thereon.
In the leg elastic region 62, a plurality of, for example, linear, string-like, or strand-like leg elastic bodies 52 are arranged, which are separated from each other by a predetermined dimension in the transverse direction X and extend in the longitudinal direction Y. In addition, instead of arranging the plurality of leg elastic bodies 52 in a linear, string, or strand shape, the leg elastic region 62 may be provided with elasticity by arranging an elastic sheet.
The leg elastic body 52 is a member in which an elastic material having a fineness of 210 to 470dtex, for example, a string shape, a strand shape, or a string shape, is attached to be stretchable by about 1.8 to 3.0 times.
When a sample of about 30mm can be cut from the elastic side flaps 43, the extension stress of the leg elastic regions 62 is measured in the same manner as the extension stress of the front and rear waist outer elastic regions 37, 40 and the like. In the case where a sample of about 30mm cannot be cut out, the sample is cut out so that the dimension in the longitudinal direction Y is constant, the elongation force is measured, and the measured value is converted into the elongation stress in the case where the width of the sample is 30 mm.
By making the fineness and the extension ratio of the leg elastic members 52 larger than those of the front and rear waist elastic members 31, 32, the extension force of the leg elastic regions 62 can be made lower than the extension forces of the front and rear waist outer elastic regions 37, 40.
The front and rear waist outer elastic regions 37 and 40 exert forces on the front and rear waist panels 18 and 19 so as to expand and contract in the transverse direction X, while the leg elastic regions 62 exert forces on the elastic crotch panel 13 so as to expand and contract in the longitudinal direction Y. The force is applied to the portions where the front and back waist panels 18 and 19 and the elastic crotch panel 13 intersect with each other. According to the diaper 10 of the present embodiment, since the extension stress of the front and rear waist outer elastic regions 37 and 40 is made larger than the extension stress of the leg elastic regions 62, the front and rear waist outer elastic regions 37 and 40 can be suppressed from expanding and contracting in the longitudinal direction Y, while being expandable and contractible in the transverse direction X, and the diaper 10 can be fitted to the waist of the wearer.
By making the fineness and the elongation ratio of the front and rear waist elastic members 33, 34 larger than those of the leg elastic members 52, the elongation force of the leg elastic regions 62 can be made lower than that of the front and rear waist elastic regions 39, 42.
The front and rear waist panels 18 and 19 are urged to expand and contract in the transverse direction X by the front and rear waist elastic regions 39 and 42, and the crotch panel 13 is urged to expand and contract in the longitudinal direction Y by the leg elastic regions 62. The force is applied to the portions where the front and back waist panels 18 and 19 and the elastic crotch panel 13 intersect with each other. According to the diaper 10 of the present embodiment, since the extension stress of the front and rear waist elastic regions 39, 42 is made larger than the extension stress of the leg elastic regions 62, the front and rear waist outer elastic regions 37, 40 are suppressed from being stretched in the longitudinal direction Y, and are stretchable in the transverse direction X, so that the diaper 10 can be fitted to the waist of the wearer.
As an example of the present embodiment, a diaper 10 in which a front waist sheet 18 and a rear waist sheet 19, which are separated in the longitudinal direction Y, are connected by a liquid-absorbent structure 11 is used, and the present invention can be applied to a diaper in which the liquid-absorbent structure 11 is disposed on the skin-facing surface of the main body formed of a sheet member in which front and rear waist regions 14 and 15 and a crotch region 16 are continuous. However, a diaper in which a front waist panel and a rear waist panel separated in the longitudinal direction are joined by a liquid-absorbent structure generally has only elastic bodies extending in the longitudinal direction and elastic bodies extending in the transverse direction. Therefore, the front and rear waist panels 18 and 19 may be displaced downward with respect to the waist of the wearer by the contractive force of the elastic member extending in the longitudinal direction. The present invention is effective particularly for the diaper described above because the front and rear waist panels 18 and 19 can be prevented from shifting downward with respect to the waist of the wearer as described above.
As an example of the present embodiment, the diaper 10 in which the front and rear leakproof sheets 28 and 29 have liquid impermeability and in which a pattern composed of various visual elements visually recognizable from the outside is printed on the non-skin-facing surfaces of the front and rear leakproof sheets 28 and 29 is used, but a liquid permeable film and a sheet on which the pattern is printed may be separately provided.
In the above embodiment, the diaper 10 in which the front waist panel 18 includes the front leakage preventing sheet 28 and the rear waist panel 19 includes the rear leakage preventing sheet 29 as the front and rear leakage preventing sheets 28 and 29 has been described as an example, but the front and rear leakage preventing sheets 28 and 29 may be formed of 1 sheet of leakage preventing sheet extending from the front waist region 14 to the rear waist region 15 in the longitudinal direction Y without being separately provided on the front waist panel 18 and the rear waist panel 19.
In the above-described embodiment, the example in which the front waist region 14 has the elastic body non-disposed region in which the elastic body is not disposed between the front waist inner elastic region 38 and the front waist elastic region 39 in the longitudinal direction Y has been described, but the elastic body non-disposed region may not be provided.
In the above embodiment, the example in which the rear waist region 15 has the elastic body non-disposed region where no elastic body is disposed between the rear waist inner elastic region 41 and the rear waist middle elastic region 42 in the longitudinal direction Y has been illustrated, but the elastic body non-disposed region may not be provided.
In the diaper 10 of the above embodiment, the case where the extension stress in the front and rear waist outer elastic regions 37, 41 is greater than the extension stress in the front and rear waist elastic regions 39, 42 has been described. However, the present invention is not limited to this case, and the extension stress in the front and rear waist portion elastic regions 39, 42 may be equal to the extension stress in the front and rear waist portion outer elastic regions 37, 41.
< second embodiment >
Referring to fig. 9, in the present embodiment, the liquid-absorbent structure 11 is also formed of an absorbent core 58, a body-side liner 59 (topsheet), an outer cover (backsheet) 60, and a leakproof sheet 61. On the other hand, the front waist panel 18 does not include the front leakproof sheet 28 and the reinforcing layer 30, and the leakproof sheet 61 of the liquid-absorbent structure 11 extends toward the front opening end edge 22 a. In addition, the waist inner layer 24 extends in the longitudinal direction Y to the vicinity of the front opening end edge 22 a. Further, front waist elastics 31, 33, 35 are disposed between the waist inner layer 24 and the waist outer layer 26. The leakproof sheet 61 is disposed between the waist inner layer 24 and the outer cover 60. The absorbent core 58 is covered with a core wrap sheet, not shown.
Referring to fig. 10, the rear waist panel 19 does not include the rear leakproof sheet 29 and the reinforcing layer 30, and the leakproof sheet 61 of the liquid-absorbent structure 11 extends toward the rear opening end edge 22 b. In addition, the waist inner 25 extends in the longitudinal direction Y to the vicinity of the rear opening end edge 22 b. Further, rear waist elastics 32, 34, 36 are disposed between the waist inner layer 25 and the waist outer layer 27. The leakproof sheet 61 is disposed between the waist inner layer 25 and the outer cover 60.
Referring to fig. 9 and 10, the interval L7 in the longitudinal direction Y from the one outer end edge 61a of the leakage-preventing sheets 61 in the front waist region 14 to the front opening end edge 22a is larger than the interval L8 in the longitudinal direction Y from the other outer end edge 61b of the leakage-preventing sheets 61 in the rear waist region 15 to the rear opening end edge 22 b.
The diaper 10 according to the second embodiment has the same action and effect as the diaper 10 of the first embodiment. In addition, the leakproof sheets 61 of the liquid-absorbent structure 11 eliminate the need to provide the front and rear leakproof sheets 28 and 29 on the front and rear waist sheets 18 and 19, and thus the parts can be manufactured at low cost and easily.
< third embodiment >
Referring to fig. 11, in the present embodiment, the first patterns 71 are disposed on both sides of the elastic crotch panel 13, and the first patterns 71 are configured to be visually recognizable from the non-skin-facing surface of the diaper 10. In fig. 11, a region where the first pattern 71 is formed is denoted by reference numeral 72. The first pattern 71 includes a first component 73 extending in the lateral direction X.
The second pattern 74a is formed on the non-skin-facing surface of the front leakproof sheet 28 in the present embodiment, and the second pattern 74a is configured to be visually recognizable from the non-skin-facing surface of the diaper 10. In fig. 11, a region where the second pattern 74a is formed is denoted by reference numeral 75. The second pattern 74a is formed, for example, over the entire width of the front leakage preventive sheet 28 in the transverse direction X. The second pattern 74a includes a second constituent element 76 extending in the longitudinal direction Y. In the front waist sheet 18, the non-display region 80 in which the second pattern 74a is not formed is formed on the front opening edge 22a side of the region 75 in which the second pattern 74a is formed.
Further, a second pattern 74b is formed on the non-skin-facing surface of the rear leakproof sheet 29, and the second pattern 74b is configured to be visually recognizable from the non-skin-facing surface of the diaper 10. In fig. 11, a region where the second pattern 74b is formed is denoted by reference numeral 77. The second pattern 74b is formed, for example, over the entire width of the rear leakage preventive sheet 29 in the transverse direction X. The second pattern 74b includes a second constituent element 78 extending in the longitudinal direction Y. In the rear waist panel 19, a non-display region 81 in which the second pattern 74b is not formed is formed on the rear opening edge 22b side of the region 77 in which the second pattern 74b is formed.
Referring to fig. 12, in the rear waist region 15, a plurality of gathers 79 extending in the longitudinal direction Y are generated due to contraction of the rear waist elastic 32 and the rear waist elastic 34. If the direction in which the gathers 79 generated in the rear waist region 15 extend is the same as the direction in which the constituent elements 78 that constitute the second pattern 74b extend, the rear opening end edge 22b in the rear waist region 15 can be made noticeable, and the configuration can be such that, assuming that the rear waist panel 19 is rolled, the wearer or a third person can easily know the rolling by the second constituent elements 78. This is also the same on the front waist region 14 side.
In addition, if the first pattern 71 and the second pattern 74b are formed to have the same structure, it can be easily known where the portion where the drain leakage can be prevented is disposed.
< fourth embodiment >
Referring to fig. 13, the front waist sheet 18 of the present embodiment includes front waist elastics 31, 33, 35 arranged at predetermined intervals in the longitudinal direction Y, and has a front outer end region 137 positioned on the front opening end 22a side, a front inner end region 138 positioned on the crotch region 16 side, and a front intermediate region 139 positioned between the front outer end region 137 and the front inner end region 138, with the length dimension in the longitudinal direction Y from the front opening end 22a to the lower end being equally divided into three.
Referring to fig. 14, the rear waist panel 19 of the present embodiment has rear waist elastics 32, 34, 36 arranged at predetermined intervals in the longitudinal direction Y, and has a rear outer end region 140 located on the rear opening end edge 22b side, a rear inner end region 141 located on the crotch region 16 side, and a rear intermediate region 142 located between the rear outer end region 140 and the rear inner end region 141, with the length dimension in the longitudinal direction Y from the rear opening end edge 22b to the lower end edge being trisected.
Since the fineness and the elongation ratio of the waist elastic members 31 to 36 are set as described above, the elongation stress in the respective regions 140 to 142 of the rear waist region 15 has a correlation: rear outer end region 140 is greater than intermediate region 142 > rear inner end region 141. Therefore, even if the extension stress of the leg elastic region 62 is set to be relatively small, the diaper 10 can be prevented from being displaced downward.
In addition, the correlation of the extension forces in the leg elastic region 62 and the rear outer end region 140 preferably satisfies the relationship of leg elastic region 62 < rear outer end region 140, and the correlation of the extension forces in the leg elastic region 62 and the rear intermediate region 142 preferably satisfies the relationship of leg elastic region 62 < rear intermediate region 142.
When the wearer of the diaper 10 is an infant, the wearer may perform a special operation such as raising the waist and putting the toes into the mouth, or crossing the legs in a lying state. In this operation, the rear inner end region 141 is stretched by the contraction action of the leg elastic regions 62, and the entire rear waist region 15 moves while being displaced forward, thereby causing a problem that the back side of the infant is exposed. In this case, when the extension of the leg elastic regions 62 is larger than the respective regions 140 to 142 of the rear waist region 15, the rear waist region 15 is easily moved forward by the contraction action of the leg elastic regions 62. In the present embodiment, since the elongation force of the leg elastic regions 62 is made smaller than the elongation force of the rear outer end region 140 and the rear intermediate region 142, even if a force for stretching the leg elastic regions 62 in the forward direction acts on the rear inner end region 141 due to contraction of the leg elastic regions 62, the rear inner end region 141 is not largely displaced and the entire rear waist region 15 is not moved in the forward direction. Further, by making the extension force of the rear intermediate region 142 and the rear outer end region 140, which are opposed to each other in the waist position from the most protruding portion of the hip of the wearer, relatively large, even if a force for stretching the leg elastic regions 62 in the forward direction acts on the rear inner end region 141, the portions of the rear intermediate region 142 and the rear outer end region 140 in the rear waist region 15 are positioned so as to be caught on the upper ends of the hip.
As the components constituting the pants-type disposable diaper 10, various known materials other than those described in the present specification and commonly used in the art can be used without limitation as long as they are not specifically described. In addition, the terms "first", "second", and "third" used in the specification and the claims are used only for distinguishing the same elements, positions, and the like.
The above disclosure of the present invention can be summarized as at least the following matters.
< first invention >
A pants-type disposable absorbent article having a longitudinal direction and a transverse direction orthogonal to the longitudinal direction, having a skin-facing surface and a non-skin-facing surface on the opposite side of the skin-facing surface, and including a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, and an absorbent core located at least in the crotch region, wherein both side edges of the front and rear waist regions are joined to each other to define a waist opening and a pair of leg openings, wherein in the pants-type disposable absorbent article, the front waist region includes a front opening end edge defining a part of the waist opening, a front waist holding region stretchable in the waist circumferential direction and located on the front opening end edge side, and a leakproof sheet located on the non-skin-facing surface side of the absorbent core, and the rear waist region includes a rear opening end edge defining a part of the waist opening, a leakproof sheet located on the non-skin-facing surface side of the absorbent core, A rear waist holding region which is stretchable in a waist circumferential direction and is located on the rear open end edge side, and the leakproof sheet is located on the non-skin-opposed surface side of the absorbent core, wherein a dimension in the longitudinal direction from an outer end edge of the leakproof sheet in the front waist region to the front open end edge is larger than a dimension in the longitudinal direction from an outer end edge of the leakproof sheet in the rear waist region to the rear open end edge, and a dimension in the longitudinal direction from the front end edge of the absorbent core to the front open end edge is smaller than a dimension in the longitudinal direction from the rear end edge to the rear open end edge of the absorbent core.
< second invention >
A pants-type disposable absorbent article having a longitudinal direction and a transverse direction orthogonal to the longitudinal direction, having a skin-facing surface and a non-skin-facing surface on the opposite side of the skin-facing surface, and including a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, and an absorbent core located at least in the crotch region, wherein both side edge portions of the front and rear waist regions are joined to each other to define a waist opening and a pair of leg openings, wherein the rear waist region includes an opening end edge forming a part of the waist opening, a waist stretchable region stretchable in a waist circumferential direction, a sheet forming the waist stretchable region, and a leakage-preventing sheet located on the non-skin-facing surface side of the absorbent core, the leakage-preventing sheet extending toward the opening end edge side beyond the rear end edge of the absorbent core, the waist stretch region is formed at least between the rear end edge and the opening end edge of the absorbent core, and a dimension in a longitudinal direction of a portion extending from the rear end edge to the opening end edge of the absorbent core is larger than a dimension in the longitudinal direction of the absorbent core in the rear waist region.
The underpants type disposable absorbent article of the present invention disclosed in the above paragraphs includes at least the following embodiments, which may be selectively employed separately or in combination with each other.
(1) The liquid absorbing structure comprises the absorbent core, and has a top sheet located on the skin-facing surface of the absorbent core, a back sheet located on the non-skin-facing surface of the absorbent core, and the leakproof sheet arranged on the non-skin-facing surface of the back sheet.
(2) The liquid absorbing structure comprises the absorbent core, and has a top sheet located on the skin-facing surface of the absorbent core, a back sheet located on the non-skin-facing surface of the absorbent core, and a liquid-impermeable sheet located on the non-skin-facing surface of the back sheet, wherein the liquid-impermeable sheet is disposed on the non-skin-facing surface of the liquid absorbing structure.
(3) The absorbent core extends continuously in the longitudinal direction, and a position of a rear end edge of the absorbent core is disposed below a position of a front end edge of the absorbent core in the longitudinal direction.
(4) The front waist holding region and the rear waist holding region are set based on a length from the front opening end edge of the front waist region to the front end edge of the absorbent core, and the rear waist holding region has a portion in which the number of sheets forming the front waist holding region is smaller than the number of sheets forming the rear waist holding region.
(5) The sheet forming the rear waist holding region has a smaller mass per unit area than the sheet forming the front waist holding region.
(6) The front waist region and the rear waist region have a front waist center region and a rear waist center region, the front waist center region and the rear waist center region extend from a lower end edge of the front waist holding region to the crotch region by a predetermined length dimension in the longitudinal direction and are adjacent to the front and rear waist holding regions, and an elongation stress in the waist circumferential direction of the rear waist holding region per unit length in the longitudinal direction is larger than an elongation stress in the waist circumferential direction of the rear waist center region per unit length in the longitudinal direction.
(7) The rear waist holding region includes a rear waist elastic body disposed on the non-skin-facing surface side of the liquid absorbent structure and extending in the transverse direction, and the rear waist elastic body extends continuously in the waist circumferential direction.
(8) A pattern that can be visually confirmed from the outside is displayed on the non-skin-facing surface of the leakproof sheet, and the pattern has a constituent element extending in the longitudinal direction.
(9) In a case where the longitudinal length from the rear opening end edge to the lower end edge on the crotch region side is trisected, the rear waist region has a rear outer end region located on the rear opening end edge side, a rear inner end region located on the crotch region side, and a rear intermediate region located between the rear outer end region and the rear inner end region, and the rear outer end region, the rear inner end region, and the rear intermediate region have a correlation of elongation stresses such that the rear intermediate region is not less than the rear outer end region > the rear inner end region.
(10) Having leg elastic regions disposed along a portion of the leg opening, the leg elastic regions and the extension forces in the rear outer end region being related in that the leg elastic regions < the rear outer end region, the leg elastic regions and the extension forces in the rear intermediate region being related in that the leg elastic regions < the intermediate region.
Description of reference numerals
10 underpants type disposable absorbent article (Disposable pull-on diaper)
11 liquid-absorbing structure
14 front waist region
15 rear waist region
16 crotch region
18 front waist panel
19 rear waist piece
22 waist opening
22a front opening edge
22b rear opening edge
23 leg opening
28 front leakproof sheet (front leakproof sheet)
29 rear leakproof sheet (rear leakproof sheet)
32 first rear waist elastic body
34 second rear waist elastic body (rear waist elastic body)
49a front waist stretch region
49b front waist holding region
49c front waist central region
50a rear waist stretch region
50b rear waist holding area
50c front waist center region
58 absorbent core
58a front edge
58b rear end edge
59 body side pad (Top sheet)
60 outer cover (back sheet)
61 leakproof sheet
62 leg elastic region
74a second pattern
76 second constituent element (constituent element)
137 front outer end area
138 front inner end region
139 front middle region
140 rear outer end region
141 rear inner end region
142 rear middle area
L1 distance in the longitudinal direction from the outer end edge of the front leakproof sheet in the front waist region to the front opening end edge
L2 distance in the longitudinal direction from the outer end edge of the rear leakproof sheet in the rear waist region to the rear opening end edge
L3 the interval dimension in the longitudinal direction from the front end edge of the absorbent core to the front opening end edge
L5 distance between the rear end edge of the absorbent core and the rear opening end edge
Longitudinal dimension of absorbent core in rear waist region of L6
L9 longitudinal dimension of waist holding region (longitudinal dimension from front opening edge in front waist region to front end of absorbent core)
L10 longitudinal dimension of waist central region (longitudinal dimension extending from lower edge of front waist holding region to crotch region)
In the X transverse direction
Y is longitudinal.

Claims (15)

1. A pants-type disposable absorbent article having a longitudinal direction and a transverse direction orthogonal to the longitudinal direction, having a skin-facing surface and a non-skin-facing surface on the opposite side of the skin-facing surface, and including a front waist region, a rear waist region, a crotch region located between the front waist region and the rear waist region, and an absorbent core located at least in the crotch region, wherein both side edge portions of the front waist region and the rear waist region are joined to each other to define a waist opening and a pair of leg openings, the pants-type disposable absorbent article being characterized in that,
the absorbent core is contained in a liquid-absorbent structure,
the front waist region includes a front opening edge defining a part of the waist opening, a front waist holding region which is stretchable in the waist circumferential direction and is positioned on the front opening edge side, a leakproof sheet positioned on the non-skin-facing surface side of the absorbent core, a front waist outer elastic region positioned on the front opening edge side, a front waist inner elastic region positioned on the crotch region side, and a front waist inner elastic region positioned between the front waist outer elastic region and the front waist inner elastic region,
the extension stress of the front waist outer elastic region is greater than the extension stress of the front waist inner elastic region,
the extension stress of the elastic region in the front waist portion is smaller than the extension stress of the elastic region in the front waist portion,
in the front waist inner elastic region, a waist elastic body is not located at the widthwise center of the liquid-absorbent structure,
the front end edge of the absorbent core is located in the elastic region in the front waist portion,
the rear waist region includes a rear opening end edge defining a part of the waist opening, a rear waist holding region which is stretchable in the waist circumferential direction and is located on the rear opening end edge side, the leakproof sheet located on the non-skin-facing surface side of the absorbent core, a rear waist external elastic region located on the rear opening end edge side, a rear waist internal elastic region located on the crotch region side, a rear waist internal elastic region located between the rear waist external elastic region and the rear waist internal elastic region, and an elastic body non-disposition region located between the rear waist internal elastic region and not disposed with a waist elastic body,
the extension stress of the rear waist outer elastic region is greater than the extension stress of the elastic region in the rear waist portion,
the extension stress of the rear waist inner elastic region is smaller than the extension stress of the rear waist inner elastic region,
in the rear waist inner elastic region, a waist elastic body is not located at the widthwise center of the liquid-absorbent structure,
the absorbent core is not included in the rear waist region, and the rear end edge of the absorbent core is adjacent to the rear waist region,
the dimension of the interval in the longitudinal direction from the outer end edge of the leakage preventive sheet in the front waist region to the front opening end edge is larger than the dimension of the interval in the longitudinal direction from the outer end edge of the leakage preventive sheet in the rear waist region to the rear opening end edge, and the dimension of the interval in the longitudinal direction from the front end edge of the absorbent core to the front opening end edge is smaller than the dimension of the interval in the longitudinal direction from the rear end edge of the absorbent core to the rear opening end edge.
2. A pants-type disposable absorbent article having a longitudinal direction and a transverse direction orthogonal to the longitudinal direction, having a skin-facing surface and a non-skin-facing surface on the opposite side of the skin-facing surface, and including a front waist region, a rear waist region, a crotch region located between the front waist region and the rear waist region, and an absorbent core located at least in the crotch region, wherein both side edge portions of the front waist region and the rear waist region are joined to each other to define a waist opening and a pair of leg openings, the pants-type disposable absorbent article being characterized in that,
the absorbent core is contained in a liquid-absorbent structure,
the front waist region includes a front opening edge defining a part of the waist opening, a front waist holding region which is stretchable in the waist circumferential direction and is positioned on the front opening edge side, a leakproof sheet positioned on the non-skin-facing surface side of the absorbent core, a front waist outer elastic region positioned on the front opening edge side, a front waist inner elastic region positioned on the crotch region side, and a front waist inner elastic region positioned between the front waist outer elastic region and the front waist inner elastic region,
the extension stress of the front waist outer elastic region is greater than the extension stress of the front waist inner elastic region,
the extension stress of the elastic region in the front waist portion is smaller than the extension stress of the elastic region in the front waist portion,
in the front waist inner elastic region, a waist elastic body is not located at the widthwise center of the liquid-absorbent structure,
the front end edge of the absorbent core is located in the elastic region in the front waist portion,
the rear waist region includes a rear opening end edge forming a part of the waist opening, a rear waist holding region being stretchable in the waist circumferential direction and located on the rear opening end edge side, a sheet forming the rear waist holding region, the leakproof sheet located on the non-skin-opposed surface side of the absorbent core, a rear waist outer elastic region located on the rear opening end edge side, a rear waist inner elastic region located on the crotch region side, a rear waist inner elastic region located between the rear waist outer elastic region and the rear waist inner elastic region, and an elastic body non-disposition region located between the rear waist inner elastic region and the rear waist middle elastic region and not having a waist elastic body disposed therein,
the extension stress of the rear waist outer elastic region is greater than the extension stress of the elastic region in the rear waist portion,
the extension stress of the rear waist inner elastic region is smaller than the extension stress of the rear waist inner elastic region,
in the rear waist inner elastic region, a waist elastic body is not located at the widthwise center of the liquid-absorbent structure,
the absorbent core is not included in the rear waist region, and the rear end edge of the absorbent core is adjacent to the rear waist region,
the leakproof sheet extends from the rear end edge of the absorbent core to the opening end edge side,
the waist stretch region is formed at least between the rear end edge and the opening end edge of the absorbent core,
a dimension in the longitudinal direction of a portion extending from the rear end edge to the open end edge side of the absorbent core is larger than a dimension in the longitudinal direction of the absorbent core in the rear waist region.
3. The absorbent article according to claim 1 or 2,
a plurality of first front waist elastics are located in the front waist outer elastic region,
a plurality of second front waist elastics are located in the front waist elastic region,
a third plurality of front waist elastics are located in said front waist inner elastic region,
by setting the fineness and the elongation ratio of the first front waist elastic body to be larger than the fineness and the elongation ratio of the second front waist elastic body, the elongation stress of the front waist outer elastic region can be made larger than the elongation stress of the front waist elastic region,
setting the fineness and the elongation ratio of the second front waist elastic body to be larger than the fineness and the elongation ratio of the third front waist elastic body makes it possible to reduce the elongation stress of the front waist inner elastic region to be smaller than the elongation stress of the front waist elastic region,
a plurality of first back waist elastics are located in the back waist outer elastic region,
a second plurality of back waist elastics are located in the back waist middle elastic region,
a third plurality of back waist elastics are located in the back waist inner elastic region,
the elongation stress of the rear waist portion outer elastic region can be made larger than the elongation stress of the rear waist portion middle elastic region by setting the fineness and the elongation ratio of the first rear waist portion elastic body larger than the fineness and the elongation ratio of the second rear waist portion elastic body,
setting the fineness and the elongation ratio of the second rear waist elastic body to be larger than the fineness and the elongation ratio of the third rear waist elastic body makes it possible to make the elongation stress of the rear waist inner elastic region smaller than the elongation stress of the rear waist elastic region,
the dimension in the longitudinal direction of the elastic body non-disposition region is larger than the pitch of the third rear waist elastic body in the rear waist inner elastic region and the pitch of the second rear waist elastic body in the rear waist middle elastic region.
4. A pants-type disposable absorbent article having a longitudinal direction and a transverse direction orthogonal to the longitudinal direction, having a skin-facing surface and a non-skin-facing surface on the opposite side of the skin-facing surface, and including a front waist region, a rear waist region, a crotch region located between the front waist region and the rear waist region, and an absorbent core located at least in the crotch region, wherein both side edge portions of the front waist region and the rear waist region are joined to each other to define a waist opening and a pair of leg openings, the pants-type disposable absorbent article being characterized in that,
the absorbent core is contained in a liquid-absorbent structure,
the front waist region includes a waist inner layer located on the skin-facing surface side, a waist outer layer located on the non-skin-facing surface side, a first reinforcing layer located on the waist opening side between the waist inner layer and the waist outer layer, a second reinforcing layer located on the crotch region side apart from the first reinforcing layer in the longitudinal direction, a front opening end edge defining a part of the waist opening, and a front waist holding region which is stretchable in the waist circumferential direction and located on the front opening end edge side, a leakproof sheet positioned on the non-skin-facing surface side of the absorbent core, a front waist outer elastic region positioned on the front opening end side, a front waist inner elastic region positioned on the crotch region side, and a front waist inner elastic region positioned between the front waist outer elastic region and the front waist inner elastic region,
the front waist outer elastic region has folded back waist outer layers and a first front waist elastic body located between the waist outer layers,
the front waist inner elastic region has the second reinforcing layer and a third front waist elastic body located between the second reinforcing layer and the waist outer layer,
the front waist elastic region has the first reinforcing layer and a second front waist elastic body crossing the absorbent core,
in the front waist inner elastic region, the third front waist elastic is not located at the widthwise center of the liquid absorbent structure,
the front end edge of the absorbent core is located in the elastic region in the front waist portion,
the rear waist region includes a waist inner layer located on the skin-facing surface side, a waist outer layer located on the non-skin-facing surface side, a rear reinforcing layer located between the waist inner layer and the waist outer layer and extending in the longitudinal direction, a rear opening end edge defining a part of the waist opening, a rear waist holding region which is stretchable in the waist-circumferential direction and located on the rear opening end edge side, the leakproof sheet located on the non-skin-facing surface side of the absorbent core, a rear waist outer elastic region located on the rear opening end edge side, a rear waist inner elastic region located on the crotch region side, a rear waist inner elastic region located between the rear waist outer elastic region and the rear waist inner elastic region, and an elastomer non-disposition region located between the rear waist inner elastic region and the rear waist middle elastic region and not disposed with a waist elastomer,
the rear waist outer elastic region has a back-folded waist outer layer and a first rear waist elastic body located between the waist outer layers,
the rear waist inner elastic region has the rear reinforcing layer and a third rear waist elastic body located between the rear reinforcing layer and the waist outer layer,
the rear waist middle elastic region is located between a rear end edge of the absorbent core and the first rear waist elastic body in the longitudinal direction, has the rear reinforcing layer and a second rear waist elastic body located between the rear reinforcing layer and the waist outer layer,
in the rear waist inner elastic region, the third rear waist elastic is not located at the widthwise center of the liquid absorbent structure,
the absorbent core is not included in the rear waist region, the rear end edge of the absorbent core is adjacent to the rear waist region,
the dimension of the interval in the longitudinal direction from the outer end edge of the leakage preventive sheet in the front waist region to the front opening end edge is larger than the dimension of the interval in the longitudinal direction from the outer end edge of the leakage preventive sheet in the rear waist region to the rear opening end edge, and the dimension of the interval in the longitudinal direction from the front end edge of the absorbent core to the front opening end edge is smaller than the dimension of the interval in the longitudinal direction from the rear end edge of the absorbent core to the rear opening end edge.
5. A pants-type disposable absorbent article having a longitudinal direction and a transverse direction orthogonal to the longitudinal direction, having a skin-facing surface and a non-skin-facing surface on the opposite side of the skin-facing surface, and including a front waist region, a rear waist region, a crotch region located between the front waist region and the rear waist region, and an absorbent core located at least in the crotch region, wherein both side edge portions of the front waist region and the rear waist region are joined to each other to define a waist opening and a pair of leg openings, the pants-type disposable absorbent article being characterized in that,
the absorbent core is contained in a liquid-absorbent structure,
the front waist region includes a waist inner layer located on the skin-facing surface side, a waist outer layer located on the non-skin-facing surface side, a first reinforcing layer located on the waist opening side between the waist inner layer and the waist outer layer, a second reinforcing layer located on the crotch region side apart from the first reinforcing layer in the longitudinal direction, a front opening end edge defining a part of the waist opening, and a front waist holding region which is stretchable in the waist circumferential direction and located on the front opening end edge side, a leakproof sheet positioned on the non-skin-facing surface side of the absorbent core, a front waist outer elastic region positioned on the front opening end side, a front waist inner elastic region positioned on the crotch region side, and a front waist inner elastic region positioned between the front waist outer elastic region and the front waist inner elastic region,
the front waist outer elastic region has folded back waist outer layers and a first front waist elastic body located between the waist outer layers,
the front waist inner elastic region has the second reinforcing layer and a third front waist elastic body located between the second reinforcing layer and the waist outer layer,
the front waist elastic region has the first reinforcing layer and a second front waist elastic body crossing the absorbent core,
in the front waist inner elastic region, the third front waist elastic is not located at the widthwise center of the liquid absorbent structure,
the front end edge of the absorbent core is located in the elastic region in the front waist portion,
the rear waist region includes a waist inner layer located on the skin-facing surface side, a waist outer layer located on the non-skin-facing surface side, a rear reinforcing layer located between the waist inner layer and the waist outer layer and extending in the longitudinal direction, a rear opening end edge forming a part of the waist opening, a rear waist holding region which is stretchable in the waist-circumferential direction and located on the rear opening end edge side, a sheet forming the rear waist holding region, a leakproof sheet located on the non-skin-facing surface side of the absorbent core, a rear waist outer elastic region located on the rear opening end edge side, a rear waist inner elastic region located on the crotch region side, a rear waist middle elastic region located between the rear waist outer elastic region and the rear waist inner elastic region, and an elastic body non-disposition region located between the rear waist inner elastic region and the rear waist middle elastic region and not disposing a waist elastic body,
the rear waist outer elastic region has a back-folded waist outer layer and a first rear waist elastic body located between the waist outer layers,
the rear waist inner elastic region has the rear reinforcing layer and a third rear waist elastic body located between the rear reinforcing layer and the waist outer layer,
the rear waist middle elastic region is located between a rear end edge of the absorbent core and the first rear waist elastic body in the longitudinal direction, has the rear reinforcing layer and a second rear waist elastic body located between the rear reinforcing layer and the waist outer layer,
in the rear waist inner elastic region, the third rear waist elastic is not located at the widthwise center of the liquid absorbent structure,
the absorbent core is not included in the rear waist region, the rear end edge of the absorbent core is adjacent to the rear waist region,
the leakproof sheet extends from the rear end edge of the absorbent core to the opening end edge side,
the waist stretch region is formed at least between the rear end edge and the opening end edge of the absorbent core,
a dimension in the longitudinal direction of a portion extending from the rear end edge to the open end edge side of the absorbent core is larger than a dimension in the longitudinal direction of the absorbent core in the rear waist region.
6. The absorbent article according to any one of claims 1, 2, 4, 5,
the liquid absorbing structure is provided with a top sheet positioned on the skin-facing surface of the absorbent core, a back sheet positioned on the non-skin-facing surface of the absorbent core, and the leakproof sheet arranged on the non-skin-facing surface of the back sheet.
7. The absorbent article according to any one of claims 1, 2, 4, 5,
the liquid-absorbing structure is provided with a top sheet positioned on the skin-facing surface of the absorbent core, a back sheet positioned on the non-skin-facing surface of the absorbent core, and a liquid-impermeable sheet positioned on the non-skin-facing surface of the back sheet,
the leakproof sheet is disposed on the non-skin-facing surface of the liquid-absorbent structure.
8. The absorbent article according to any one of claims 1, 2, 4, 5,
the absorbent core extends continuously in the longitudinal direction, and the position of the rear end edge of the absorbent core is disposed below the position of the front end edge of the absorbent core in the longitudinal direction.
9. The absorbent article according to any one of claims 1, 2, 4, 5,
the front waist holding region and the rear waist holding region are set based on a length from the front opening end edge in the front waist region to the front end edge of the absorbent core,
the rear waist holding region has a portion in which the number of sheets forming the front waist holding region is smaller than the number of sheets forming the rear waist holding region.
10. The absorbent article according to any one of claims 1, 2, 4, 5,
the sheet forming the rear waist holding region has a smaller mass per unit area than the sheet forming the front waist holding region.
11. The absorbent article of claim 9,
the front waist region and the rear waist region have a front waist center region and a rear waist center region, the front and rear waist center regions extending from a lower end edge of the front waist holding region to the crotch region in the longitudinal direction by a predetermined length dimension and being adjacent to the front waist holding region and the rear waist holding region,
an elongation stress in the waist circumferential direction per unit length of the rear waist holding region in the longitudinal direction is larger than an elongation stress in the waist circumferential direction per unit length of the rear waist central region in the longitudinal direction.
12. The absorbent article of claim 9,
the rear waist holding region includes a rear waist elastic body disposed on the non-skin-facing surface side of the liquid absorbent structure and extending in the transverse direction,
the rear waist elastic body extends continuously in the waist circumferential direction.
13. The absorbent article of claim 8,
a pattern visually recognizable from the outside is displayed on the non-skin-facing surface of the leakproof sheet,
the pattern has constituent elements extending in the longitudinal direction.
14. The absorbent article according to any one of claims 1, 2, 4, 5,
in a case where the longitudinal length from the rear opening end edge to the lower end edge on the crotch region side is trisected, the rear waist region has a rear outer end region located on the rear opening end edge side, a rear inner end region located on the crotch region side, and a rear intermediate region located between the rear outer end region and the rear inner end region, and the rear outer end region, the rear inner end region, and the rear intermediate region have a correlation of elongation stresses such that the rear outer end region is not less than the rear intermediate region > the rear inner end region.
15. The absorbent article of claim 14,
having leg elastic regions disposed along a portion of the leg openings,
the leg elastic region and the rear outer end region are in a correlated relationship of extension forces in the leg elastic region < the rear outer end region,
the leg elastic region and the rear intermediate region have a correlation of extension forces in the leg elastic region < the rear intermediate region.
CN201480061225.6A 2013-11-09 2014-09-25 Underpants type disposable absorbent article Active CN105705123B (en)

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