WO2016104753A1 - Disposable diaper - Google Patents

Disposable diaper Download PDF

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Publication number
WO2016104753A1
WO2016104753A1 PCT/JP2015/086348 JP2015086348W WO2016104753A1 WO 2016104753 A1 WO2016104753 A1 WO 2016104753A1 JP 2015086348 W JP2015086348 W JP 2015086348W WO 2016104753 A1 WO2016104753 A1 WO 2016104753A1
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WO
WIPO (PCT)
Prior art keywords
waist
side
sheet
diaper
high rigidity
Prior art date
Application number
PCT/JP2015/086348
Other languages
French (fr)
Japanese (ja)
Inventor
友美 衛藤
中嶋 海陽
田中 嘉則
Original Assignee
ユニ・チャーム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2014-266711 priority Critical
Priority to JP2014266711 priority
Application filed by ユニ・チャーム株式会社 filed Critical ユニ・チャーム株式会社
Publication of WO2016104753A1 publication Critical patent/WO2016104753A1/en

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent 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
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent 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
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/496Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs

Abstract

A disposable diaper is provided with side flaps that feel pleasant against the skin and that make it possible to increase the bonding strength with a waist belt. The disposable diaper (10) is provided with a diaper main body (16) and a pair of waist belts (17) for connecting front and back waist areas (11) and (12). The pair of waist belts (17) are bonded to the diaper main body (16) via bonding lines (18A) and (18B) that approach a vertical center line (P) from a leg opening (15) side toward a waist opening (14) side. The diaper main body (16) comprises side flaps (40) that extend in the longitudinal direction (Y) on the outside of the width direction (X) of the edge sections on both sides of an absorbent body (23). The side flaps (40) comprise high rigidity areas (41) in edge sections thereof that extend along the leg openings (15), said high rigidity areas (41) having high rigidity compared to other areas. Both ends (41A) and (41B) of the high rigidity areas (41) are positioned on the bonding lines (18A) and (18B).

Description

Disposable diapers

This invention relates to a disposable diaper.

Conventionally, it has a front and rear waist region, a crotch region located between the front and rear waist regions, a diaper body having an absorber, a pair of waist belts for connecting the front and rear waist regions, a waist opening and a pair of leg openings Disposable diapers comprising are known. For example, in the disposable diaper disclosed in Patent Document 1, a pair of waist belts are joined to a diaper body via a joining line that approaches a longitudinal center line from the leg opening side toward the waist opening side. A pair of side flaps are formed on the outer side in the lateral direction of the absorber. The side flap is composed of a plurality of laminated sheet members, and has a substantially uniform rigidity as a whole. The side flap is joined to the waist belt through a joining line, and forms a leg opening together with the waist belt.

Japanese Patent Laid-Open No. 9-10261

The diaper described in Patent Document 1 seems to be underwear to the wearer compared to a diaper in which the front and rear waist regions are formed by an annular waist belt and a diaper in which the front and rear waist regions and the crotch region are formed by an integral sheet member. Can give an impression.

However, in the diaper described in Patent Document 1, when the diaper is pulled up by gripping the waist belt, if the joint strength at the joint between the waist belt and the side flap is relatively low, the leg opening side of the joint line In the vicinity of the end portion, the side flap is easily broken. On the other hand, if the rigidity of the entire side flap is increased in order to increase the bonding strength, the flexibility of the side flap is impaired, and the touch is lowered.

An object of the present invention is to provide a disposable diaper that is an improvement of the conventional technology, can increase the bonding strength with a waist belt, and includes a side flap that is comfortable to the touch.

The present invention has a longitudinal direction and a lateral direction, and a longitudinal center line that bisects the dimension in the lateral direction, and includes a front and rear waist region, a crotch region located between the front and rear waist regions, and an absorber. A disposable diaper comprising a diaper body, a pair of waist belts for connecting the front and rear waist regions, a waist opening and a pair of leg openings.

According to the present invention, in the diaper, the pair of waist belts are joined to the diaper main body via a joining line whose spacing decreases from the leg opening side toward the waist opening side in the front and rear waist region. The diaper body has side flaps extending in the longitudinal direction outside the lateral edges of both side edges of the absorbent body, and the side flaps have other regions at the edges extending along the leg openings. It has a high-rigidity region having a higher rigidity than that of the two, and both end portions of the high-rigidity region are located on the joining line.

The diaper main body includes a liquid-permeable inner layer sheet, a liquid-impermeable outer layer sheet, the absorber positioned between the inner and outer layer sheets, and a pair of side sheets disposed on both sides of the absorber. The high rigidity region is formed by disposing a separate elastic sheet on the side seat, so that the leg opening edge is fitted to the body in a plane without a gap, and the side leakage of excrement is prevented. It can be prevented.

The side sheet includes a first sheet positioned on the skin facing surface side and a second sheet positioned on the non-skin facing surface side, and the elastic sheet is positioned between the first and second sheets. For this reason, both side edges of the elastic sheet are not exposed to the outside and peel off, or do not feel uncomfortable by touching the skin.

Since the elastic sheet is disposed on at least one of the skin facing surface side and the non-skin facing surface side of the side sheet, elasticity can be imparted to the non-elastic side sheet.

Since the plurality of leg elastic bodies extending in the vertical direction are arranged in the high rigidity region, the fitting property at the leg opening edge can be improved together with the elastic sheet.

The leg elastic body is disposed between sheet members stacked in the high rigidity region, and a plurality of waist elastic bodies are disposed on the waist belt, and the leg elastic body and the waist elastic body are disposed. Since the body does not overlap each other in the thickness direction of the sheet member, it is possible to avoid the concentration of stress due to the overlapping, and to fit the leg opening edge in a planar shape.

Since the width dimension of the high-rigidity region is 3 to 30 mm, the leg opening edge can be fitted to the wearer's thigh in a planar shape.

According to one or more embodiments of the disposable diaper according to the present invention, the side flap has a high rigidity region having higher rigidity than other regions at the edge extending along the leg opening, Since both ends of the high rigidity region are located on the joining line, the joining strength between the waist belt and the side flaps is increased at the end of the joining line on the leg opening side, and the side flaps are torn. Can be prevented. Furthermore, in the side flaps, the high rigidity area is located at the edge of the side flaps that form the leg openings, and the other areas are relatively low in rigidity, so that the flexibility of the side flaps is maintained. , Can feel better.

The perspective view of a diaper shown as an example of the disposable diaper in 1st Embodiment of this invention. The top view in the state where it was extended in the vertical direction and the horizontal direction of a diaper, and the inner surface of a waist belt and the inner surface of a diaper main part were contacted. The expansion | deployment top view in the state which uncouple | bonded the joining line in the front-and-rear waist area of a diaper, and extended the diaper main body and the waist belt to the vertical direction and the horizontal direction. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. The enlarged view of the area | region enclosed with the V line | wire of FIG. (A) The partial enlarged view of the area | region enclosed by the V (a) line | wire of FIG. (B) The elements on larger scale of the area | region enclosed with the V (b) line | wire of FIG. The front view of the diaper of the state which shrunk in the aspect which the inner surface of the front waist area and the inner surface of the rear waist area contact | abutted mutually. The front view of a diaper which shows a mode when wearing. The side view of a diaper in a wearing condition. Sectional drawing similar to FIG. 5 of the diaper 10 in an example of a modification.

Each embodiment described below relates to the disposable diaper shown in FIGS. 1 to 10 as an example of the present invention, and includes not only an indispensable structure of the invention but also a selective and preferable structure. 2 to 4, each elastic body to be described later is naturally gathered on the member to which each elastic body is attached by the contracting force in the lateral direction X and the longitudinal direction Y against the contracting force. It is in a state of being stretched to such an extent that it appears to be substantially lost visually.

1 to 3, a diaper 10 which is an example of a disposable diaper according to the present invention includes a longitudinal direction Y and a transverse direction X orthogonal thereto, a skin facing surface and a non-skin facing surface on the opposite side thereof, A longitudinal center line P that bisects the length dimension in the direction X and a lateral center line Q that bisects the length dimension in the longitudinal direction Y; a front waist region 11; a rear waist region 12; And a crotch region 13 located between the front waist region 11 and the rear waist region 12. The diaper 10 is substantially symmetric with respect to the longitudinal center line P, and has a waist opening 14 and a pair of leg openings 15.

The diaper 10 includes a diaper main body 16 having an absorber 23 and extending in the longitudinal direction Y, and a pair of waist belts 17 for connecting the front and rear waist regions 11 and 12. The pair of waist belts 17 is arranged substantially symmetrically with respect to the longitudinal center line P, and is formed of a plurality of independent seal portions that approach the longitudinal center line P from the leg opening 15 side toward the waist opening 14 side. It joins to the diaper main body 16 via line (seal line) 18A, 18B. The seal portion is applied by a known joining means, for example, various heat welding means such as hot embossing and sonic processing. As for the waist belt 17, the skin opposing surface and the skin opposing surface of the diaper main body 16 are mutually fixed in joining line 18A, 18B. By having such a joining mode, the joining lines 18A and 18B do not touch the wearer's body and give a sense of incongruity or irritation. As long as the effects of the present embodiment described later can be obtained, known joining means such as a hot melt adhesive can be used for the joining lines 18A and 18B in addition to the heat welding means. The waist belt 17 is formed by a pair of elastic panels, but can be formed from the same sheet material as the diaper body 16 by a manufacturing method described later.

<Diaper body>
Referring to FIGS. 3 to 5, the diaper body 16 is defined by a front end edge 16a and a rear end edge 16b which are opposed to each other in the longitudinal direction Y, and both side edges 16c and 16d which are opposed to each other in the lateral direction X. It has a front end portion 20A located between the front end edges 16a, a rear end portion 20B located between the rear end edges 16b, and an intermediate portion 20C located between the front and rear end portions 20A and 20B. The front and rear end edges 16a and 16b are substantially symmetrical with respect to the vertical center line P and extend in a convex shape toward the outside in the vertical direction Y. The front and rear end portions 20A and 20B are located in the front and rear waist regions 11 and 12 of the diaper 10, respectively, and the intermediate portion 20C is located in the crotch region 13.

The diaper main body 16 includes a liquid-permeable inner layer sheet 21 located on the skin facing surface, a liquid-impervious outer layer sheet 22 located on the non-skin facing surface, and an absorbent body located between the inner and outer layer sheets 21 and 22. 23, and a liquid-impervious or liquid-impervious leak-proof sheet 24 positioned between the absorber 23 and the outer layer sheet 22. On both sides of the inner and outer layer sheets 21, 22, a pair of side sheets 25 that are spaced apart from each other in the horizontal direction X and extend in the vertical direction Y are disposed. Moreover, the diaper main body 16 is the part (namely, the outer side of the horizontal direction of the absorber 23) which extends to the outer side of the horizontal direction X from the both-sides edge of the inner / outer layer sheets 21 and 22 and the leak-proof sheet 24 of the side sheet 25. , The side flaps 40 are made up of the inner and outer layer sheets 21 and 22 and the region not including the leak-proof sheet 24.

The inner layer sheet 21 has a substantially octagonal shape and has a mass of about 15 to 35 g / m 2 , preferably about 18 to 24 g / m 2, a hydrophilically treated hydrophobic air-through fiber nonwoven fabric, spunbond fiber nonwoven fabric, and point bond fiber nonwoven fabric. Etc. are preferably formed. The outer layer sheet 22 is approximately the same shape and size as the inner layer sheet 21, and has a hydrophobic spunbond / meltblown / spunbond (hereinafter referred to as “preferred”) having a mass of about 15-30 g / m 2 , preferably about 18-24 g / m 2. It is preferably formed from a fiber nonwoven fabric or a spunbond fiber nonwoven fabric (referred to as SMS).

The absorbent body 23 has front and rear end edges 23a and 23b that are curved outward in the vertical direction Y, and both side edges 23c that extend in the vertical direction Y between the front and rear end edges, and is a liquid absorption molded in a required shape. And a liquid diffusible core cover sheet such as tissue paper covering the liquid absorbent core. As the absorbent core, wood fluff pulp, superabsorbent polymer particles, or a mixture thereof can be used. The liquid-absorbent core and the core cover sheet can be joined to each other using a known joining means such as a hot melt adhesive.

The leak-proof sheet 24 is disposed so as to cover at least the entire non-skin facing surface (bottom surface) of the absorbent body 23, and a known joint such as a hot melt adhesive is interposed between the absorbent body 23 and the outer layer sheet 22. It can be joined by means. As the leak-proof sheet 24, for example, a liquid-permeable, preferably liquid-impervious and breathable plastic film can be used, and the leak-proof sheet 24 covers the entire non-skin facing surface of the absorbent body 23. Thus, the body fluid absorbed by the absorber 23 can be prevented from leaking to the outside of the diaper 10. Although not shown, the decorative element can be transmitted from the outer layer sheet 22 having a required light transmittance by using a sheet having decorative elements such as a pattern and a color as the leak-proof sheet 24.

Referring to FIGS. 4 and 5, the pair of side sheets 25 are disposed on both sides in the lateral direction X of the absorbent body 23, and a publicly known hot melt adhesive or the like is provided between the leak-proof sheet 24 and the inner layer sheet 21. It is joined by the joining means. The side sheet 25 is formed of a first sheet 25A located on the absorber 23 side and a second sheet 25B located on the outer layer sheet 22 side, and both sheets 25A and 25B are joined by a known means such as a hot melt adhesive. Has been. As the side sheet 25, for example, a hydrophobic SMS fiber nonwoven fabric or a spunbond fiber nonwoven fabric having a mass of about 10 to 30 g / m 2 can be used.

Between the outer edge portion of the first sheet 25A and the outer edge portion of the second sheet 25B, a plurality of leg elastic bodies 26 extending in the vertical direction, and leg elasticity located on the skin facing surface side of the leg elastic bodies 26 A sheet 27 is disposed. The side flap 40 has a high-rigidity area 41 in which the leg elastic sheet 27 is disposed and a low-rigidity area 42 that is located only in the lateral direction X and that is formed only from the sidesheet 25. The high rigidity area 41 has a higher rigidity than the low rigidity area 42 because the number of stacked sheets is larger than that of the low rigidity area 42. In this way, in order to form a region having higher rigidity than the low rigidity region 42 along the leg opening edge, the side sheet 25 is bent instead of or together with the leg elastic sheet 27. A part may be located or an inelastic auxiliary sheet may be arranged.

The leg elastic body 26 is formed of a plurality of string-like or strand-like elastic materials attached so as to be contractible in the longitudinal direction Y between the front end edge 16a and the rear end edge 16b of the diaper body 16. . The leg elastic sheet 27 is a belt-like elastic member that is attached to be stretchable in the longitudinal direction Y between the front end edge 16a and the rear end edge 16b of the diaper body 16, and is an elastic member formed from flat rubber or elastic fiber. It is formed from a stretchable nonwoven fabric. By arranging the leg elastic body 26 and the leg elastic sheet 27 on both sides of the diaper main body 16, a leg elastic region (high rigidity region 41 and The same region) is formed. Referring to FIG. 3, since the leg elastic sheet 27 extends from the front end edge 16a to the rear end edge 16b of the diaper main body 16, both ends of the high rigidity region 41, that is, both ends 41A and 41B in the longitudinal direction Y are , Located on the joining lines 18A, 18B. In the present embodiment, the side sheet 25 is formed of two sheets 25A and 25B, but may be formed by bending and fixing a single fiber nonwoven fabric, or formed from an extended portion of the outer layer sheet 22. May be. The leg elastic sheet 27 may be disposed on the skin facing surface side or the non-skin facing surface side of the side sheet 25, but is disposed between the first sheet 25A and the second sheet 25B as in the present embodiment. As a result, it is possible to prevent the side edge from being exposed to the outside and peeling off from the outside, and to reduce the uncomfortable feeling caused by the side edge directly touching the skin.

<Waist belt>
Referring to FIGS. 2 and 3, the waist belt 17 has both end edges (front and rear end edges) 17a and 17b joined to the diaper body 16 via joining lines 18A and 18B, and both side edges 16c and 16d of the diaper body 16. It has a lower edge 17c that forms a leg opening 15 and an upper edge 17d that forms a waist opening edge. The waist belt 17 is divided into an upper portion 51 located on the waist opening side (first side edge side) and a lower portion 52 located on the leg opening side (second side edge side). The width-wise dimension of the upper part and the lower part is approximately 30 to 70% of the width dimension W1 of the waist belt 17 and preferably 50%. Therefore, for example, in the case of an M size of a normal adult diaper, the width dimension W1 of the waist belt 17 is about 70 mm, and the width dimension of the upper and lower portions 51 and 52 is about 35 mm.

The waist belt 17 has inner and outer layers 31 and 32 formed from a waist sheet 30 made of fiber nonwoven fabric. Between the inner and outer layers 31, 32, a plurality of waist elastic bodies 33, 34 formed of a string-like or strand-like elastic material are attached so as to be contracted in an expanded state. The waist elastic bodies 33, 34 include an upper waist elastic body 33 disposed in the upper portion 51 and a lower waist elastic body 34 disposed in the lower portion 52.

A waist elastic sheet 35 formed of an elastic fiber nonwoven fabric is disposed on the lower edge 17c side of the waist sheet 30. The waist elastic sheet 35 is disposed so that a part thereof overlaps with the lower waist elastic body 34 located at the bottom. Further, the waist sheet 30 is fixed in a state where a part thereof is bent inward on the upper edge 17d side. A plurality of upper waist elastic bodies 33 are arranged in the bent portion 36. Moreover, the upper waist elastic body 33 arrange | positioned at the bending part 36 and the upper waist elastic body 33 arrange | positioned at main parts other than the bending part 36 of the waist sheet 30 have shifted | deviated in thickness direction, respectively. Preferably it is. Thereby, concentration of the extension stress by the upper waist elastic body 33 overlapping in the thickness direction can be avoided, and fit to the body can be realized in a wide range. Furthermore, when the bent portion 36 is positioned at the edge of the waist opening, the light transmittance is locally lowered, and an appearance like underwear like shorts is exhibited.

In the present embodiment, ten upper waist elastic bodies 33 are arranged in the upper portion 51 of the waist belt 17. The six upper waist elastic bodies 33 (including the elastic body arranged in the bent portion 36) arranged on the waist opening side have a thickness of 450 to 500 dtex and extend 3.0 to 3.5 times. It is fixed in the state. The four elastic bodies arranged on the leg opening side of the upper waist elastic body 33 have a thickness of 600 to 650 dtex and are fixed while being stretched 2.5 to 3.0 times. Yes. Seven lower waist elastic bodies 34 are arranged in the lower portion 52, and the lower waist elastic body 34 has a thickness of 600 to 650 dtex and is fixed in a state of being stretched 2.5 to 3.0 times. Has been. The pitch (separation dimension) between the elastic bodies in the upper waist elastic body 33 and the lower waist elastic body 34 is an equal interval, and is 5.0 to 6.0 mm.

In the waist belt 17, the lower waist elastic body 34 and the leg elastic sheet 27 are arranged in the lower portion 52, so that the unit of the lower portion 52 is larger than the elongation stress in the lateral direction X per unit area of the upper portion 51. The elongation stress in the lateral direction X per area is high. Thus, by making the elongation stress of the upper portion 51 relatively low, the waist opening can be easily expanded when worn. On the other hand, since the extension stress of the lower part 52 is relatively high, it can be stably fitted to the wearer's body around the leg and can exhibit a required holding force. In particular, the diaper 10 is a so-called low-rise type that has a shallow crotch, where the width dimension of the waist belt 17 is smaller than the width dimension of the diaper body, and is easily displaced by the movement of the wearer during wear. Such a positional shift can be suppressed by being stably fitted to the body at 52.

<Method for measuring elongation stress>
The elongation stress of the upper part 51 and the lower part 52 was measured by the following method using a tensile tester manufactured by Instron Japan Company Limited. First, the absorbent body 23 is removed from the diaper 10, and the regions forming the front and rear waist regions 11 and 12 extending in the direction around the waist are cut out to obtain an annular elastic panel. By cutting along a cut line extending in the direction around the waist at the center portion in the direction Y), the annular sample 1 corresponding to the upper portion 11A of the front and rear waist regions 11 and 12, and the lower portion 11B of the front and rear waist regions 11 and 12 Are obtained, and the dimensions of the samples 1 and 2 in the contracted state are measured (K1, K2), respectively.

First, when measuring the elongation stress of the sample 1, the separation distance between the upper and lower hooks of the tensile tester is adjusted so as to be the length dimension K1 in the contracted state of the sample 1, and the upper hook (fixing tool) is measured. One end of the sample 1 (the portion corresponding to the central portion 17f in the longitudinal direction of the waist belt 17 shown in FIG. 7), the other end of the sample 1 (the longitudinal length of the waist belt 17 shown in FIG. 7) on the lower hook (movable tool). A portion corresponding to the central portion 17e in the direction) is attached. In addition, before extending | stretching, the distance between hooks is finely adjusted so that extension stress may be set to 0.1N. Thereafter, the tensile tester is set to the cycle mode, and the upper hook is moved at a tensile speed of 300 mm / min. For example, for the sample 1 (upper part), when the dimension K1 at the time of contraction is 244 mm, the sample 1 is further extended 235 mm and then returned to the origin twice. And the return stress at the time of the second extension of 181 mm was measured and used as the extension stress of Sample 1. On the other hand, the elongation stress of Sample 2 was also determined by the same measurement method as Sample 1.

According to the measurement results obtained by the above measurement method, the outbound stress of sample 1 was 1.082N and the outbound stress of sample 2 was 1.083N, both of which were almost the same magnitude. Therefore, in the front and rear waist regions 11 and 12, the extension stress when stretched in the direction around the waist is substantially the same, and when worn, the entire front and rear waist regions 11 and 12 are expanded with a relatively small force. Can do. On the other hand, the return stress of Sample 1 was 3.476 N, and the return stress of Sample 2 was 4.557 N. Therefore, in a wearing state, it can be said that the leg opening side of the front and rear waist regions 11 and 12 fits the body more than the waist opening side.

The lower waist elastic body 34 disposed in the lower portion 52 is attached at a lower expansion ratio than the upper waist elastic body 33 disposed in the upper portion 51. Specifically, the difference between the expansion ratio of the lower waist elastic body 34 and the expansion ratio of the upper waist elastic body 33 is 0.5 times or less. Specifically, the expansion ratio of the upper waist elastic body 33 is 3.2 to 3.7 times, and the expansion ratio of the lower waist elastic body 34 is 2.7 to 3.2 times. In this way, by setting the expansion ratio of the lower waist elastic body 34 to be relatively low, the amount of contraction of the lower portion 52 is smaller than that of the upper portion 51, and the leg opening is smaller in the contracted state than in the expanded state. Since it does not become extremely small and it is easy to insert the leg into the leg opening, it can be smoothly worn without the tip of the leg getting caught in the leg opening. In addition, by adjusting the leg elastic sheet 27 in the lower portion 52 instead of adjusting the pitch and number of the upper waist elastic body 33 and the lower waist elastic body 34, the size of the leg opening edge in the contracted state is reduced to the leg. The elastic sheet 27 is larger than the state in which the elastic sheet 27 is not arranged, the leg opening can be made larger, and further, the upper and lower parts 51 and 52 are set so as to cause a difference in elongation stress. Even when 52 has a relatively high elongation stress, it fits in a planar shape and the biting into the skin is suppressed.

Further, it is preferable that the thickness of the lower waist elastic body 34 is larger than that of the upper waist elastic body 33. Thus, by setting the thickness of the lower waist elastic body 34 to be relatively large, it is possible to exert a relatively large elongation stress at a low magnification, and to realize the fit of the leg opening edge. it can.

Referring to FIGS. 2 and 3, the waist belt 17 has a length dimension L3 of the upper edge 17d larger than a length dimension L4 of the lower edge 17c when the diaper 10 is unfolded by peeling the joining line 18A. Large and trapezoidal. Specifically, for example, in a normal M size diaper, the length dimension (the length dimension of the upper portion 51) L5 of the upper edge 17d of the waist belt 17 is 550 to 600 mm, and the length dimension of the lower edge 17c. (Length dimension of lower portion 52) L6 is 300 to 350 mm, and dimension W1 in the width direction is 60 to 95 mm. Even in a state where the waist belt 17 is contracted, the length dimension L6 of the lower part 52 is smaller than the length dimension L5 of the upper part 51. In the state where the waist belt 17 is extended and contracted, the length dimension L6 of the lower part 52 is 50 to 80% of the length dimension L5 of the upper part 51.

Referring to FIGS. 6 (a) and 6 (b), the waist belt 17 is a diaper through joint lines 18A and 18B so that the first side edge 17c side is the leg opening edge side and the second side edge 17d side is the waist opening edge side. The main body 16 is joined to the front and rear end portions 20A and 20B so as to be contractable in an extended state. In this embodiment, it intersects perpendicularly with the waist opening edge in the intersection 61 of the boundary line 60 of the waist belt 17 and the diaper main body 16 which forms the inner edge of the joining line 18A, and a waist opening edge (it extends in parallel with the longitudinal centerline P). ) The intersection angle θ1, which is the intersection angle between the imaginary line 62 and the boundary line, is the difference between the imaginary line 64 and the boundary line perpendicular to the waist opening edge at the intersection 63 of the boundary line and the waist opening edge forming the inner edge of the joint line 18B. It is the same as the intersection angle θ2. However, if necessary, the crossing angles θ1 and θ2 may be different from each other. In that case, the front side (abdominal side) and the rear side (back side) of the diaper 10 can be easily worn at the time of wearing. Can be identified.

When the diaper 10 is worn, the wearer or the wear assistant concentrates the force to grip and lift the waist belt 17 and the force to pull the waist elastic bodies 33 and 34 in the direction around the waist. The stress concentrates at the intersections 61 and 63 between the waist opening and the joining line 18A, and the tearing is likely to occur. In the joining line 18A, since a plurality of sheets are joined and integrated by heat welding means instead of a hot melt adhesive, the rigidity is relatively high, and even when such force is concentrated. It is possible to suppress the diaper 10 from being broken. Further, in order to prevent the breakage from the intersection points 61 and 63, the bonding area of the entire bonding lines 18A and 18B or the portion on the intersection points 61 and 63 side is made larger than that of other portions to locally increase the bonding strength. The sheet strength may be increased by attaching a reinforcing sheet to a region including the portion.

Referring to FIG. 3, the longitudinal dimension Y2 of the absorbent body 23 is about 65 to 95% of the longitudinal dimension L1 of the diaper 10 (diaper body 16). Usually, the longitudinal dimension of the absorbent body is about 60% of the longitudinal dimension of the diaper, and is a portion formed only of a sheet member positioned on the outer side in the longitudinal direction from the absorbent body of the diaper. The area is relatively large. In the present embodiment, the absorbent body 23 has a length dimension sufficient to exhibit the required absorption performance, while comparing the area of the portion consisting only of the sheet member positioned outside in the longitudinal direction Y. By making it small, it can manufacture with fewer materials and can suppress manufacturing cost. Further, since the front and rear end edges 23a and 23b of the absorbent body 23 and the front and rear end edges 16a and 16b of the diaper main body 16 are closer to each other than a normal diaper, the waist opening is lower than the umbilicus part in the worn state. It becomes a clean wearing aspect with low rise like that.

Referring to FIG. 7, the diaper 10 has a curved shape such that the waist opening is convex downward as a whole. That is, since the position of the center part in the lateral direction of the front and rear waist regions 11 and 12 is located below the both side portions, the length dimension of the upper and lower areas is the same or the length dimension of the upper area is lower. Compared to a conventional diaper larger than the length of the side area, it can give a clean impression and is excellent in design.

Referring to FIG. 8, when the waist belt 17 is pulled up when the diaper 10 is worn, stress is concentrated on the joining lines 18A and 18B. In particular, at the end 45 on the side of the leg opening 15 in the joining lines 18A and 18B, the second side edge 17b of the waist belt 17 is in a non-wearing position (position of the second side edge 17b indicated by a virtual line in FIG. 5). In this state, the tensile stress increases and the tearing is likely to occur. In the diaper 10 of the present embodiment, both end portions 41A and 41B of the high rigidity region 41 extend to the end portions 45 of the joining lines 18A and 18B. Therefore, the end portion 45 is laminated as compared with the low rigidity region 42. The number of sheets being increased (see FIG. 6) increases the bonding strength at the seal portion. Thereby, even if stress concentrates on the end portion 45 of the joining lines 18A and 18B, it is possible to effectively prevent the side flap 40 from being broken at the end portion 45 and in the vicinity thereof. Moreover, in the side flap 40, since the flexible low-rigidity area | region 42 is located inside the high-rigidity area | region 41, the touch can be improved.

Referring to FIG. 5 again, the width dimension W2 of the high rigidity region 41 is in the range of about 3 to 30 mm in consideration of the balance between the fit by the high rigidity region 41 and the touch by the low rigidity region 42. Is more preferable, and a range of about 5 to 15 mm is more preferable. Further, the leg elastic body 26 and the lower waist elastic body 34 are arranged so as not to overlap each other in the thickness direction Z. Thereby, it is possible to suppress the tensile force due to the elastic bodies 26 and 34 from being concentrated on one point on the joining lines 18A and 18B (see the enlarged view in FIG. 8), and to be more difficult to break. Furthermore, in the plan view shown in FIG. 2, a part of the leg elastic body 26 is positioned outside the lower waist elastic body 34 in the lateral direction X, thereby effectively preventing the side leakage of excrement from the leg opening edge. Can be prevented.

As described above, in the diaper 10, the bent portion 36 is positioned at the edge of the waist opening 14, so that the portion where the bent portion 36 is located is more than the other portions of the waist belt 17, as in the leg opening 15. High rigidity is also formed in the waist high rigidity region. Therefore, when the diaper 10 is worn, the diaper 10 can be pulled up by placing a finger on the boundary between the high rigidity region of the waist and the relatively low rigidity region adjacent thereto. The boundary is easy to bend due to the difference in rigidity, and the high rigidity region of the waist is convex as compared to the adjacent part. Becomes easier. Furthermore, since the waist high rigidity region extends to the joining lines 18A and 18B of the front and rear waist regions 11 and 12, the number of sheets stacked is increased at the end of the joining lines 18A and 18B on the waist opening 14 side. Therefore, the bonding strength is increased, and the occurrence of tearing from the end portion can be prevented.

The diaper 10 of the present embodiment can give an impression of underwear as compared to a diaper whose front and rear waist regions are formed by an annular waist belt, and is a relatively shallow crotch that is preferred for light incontinence for adults. It is suitable as a waist type (low-rise type) diaper. When the diaper 10 is used for light incontinence, the thickness dimension of the absorber 23 is relatively small, and a leak-proof flap that rises toward the wearer is formed on the skin facing surface side of the absorber 23. Preferably not. Further, in order to give an impression like underwear and increase flexibility, the number of sheet members laminated in the low-rigidity region 42 is preferably two or less, and more preferably one. On the other hand, in the high rigidity region 41, it is preferable that two or more (preferably 2 to 3) sheet members are laminated and an elastic material (for example, a leg elastic body) is disposed.

Referring to FIG. 9, the waist elastic sheet 35 gradually becomes narrower from the both end portions 35A and 35B located on the joining lines 18A and 18B side toward the center portion 35C in the waist direction in the upper portion 51 of the leg opening 15. It is the narrowest in the central part (the narrowest part) 35C. Similarly, the leg elastic sheet 27 is gradually narrowed from both end portions 27A and 27B located on the side of the joining lines 18A and 18B toward the central portion (the narrowest portion) 27C in the waist direction. The portion 27C is the narrowest. Since the waist elastic sheet 35 and the leg elastic sheet 27 have such a shape, the both ends 27A, 27B, 35A, and 35B of both sheets located on the joining lines 18A and 18B side are within the wearer's body. The center of the thigh is easily fitted to the root of the thigh where a gap is easily formed between the diaper 10 and the center portions 27C and 35C are placed in contact with the vicinity of the hip bone and the outer portion of the thigh with the least movement in the body. By contacting, it is possible to achieve an appropriate fit to the body while suppressing the material cost compared to the case where the entire elastic sheet is formed with the same width dimension. In addition, by displacing the narrowest part 35C of the waist elastic sheet 35 and the narrowest part 27C of the leg elastic sheet 27 slightly forward from the center part of the respective length dimensions, a wide area on the buttock side. Since the front portion of the leg opening is larger than the rear portion, the leg opening is closer to the line of the leg opening of the underwear, and it is easier to fit the body together with the underwear.

<Modification>
FIG. 10 is a cross-sectional view similar to FIG. 5 of the diaper 10 in an example of a modification. In the present modification, in the high rigidity region 41, an auxiliary sheet 70 made of a fiber nonwoven fabric having elasticity or inelasticity is fixed to the skin facing surface side of the side sheet 25 (or the first side sea 25A) with an adhesive. . As described above, by arranging the auxiliary sheet 70 in the high rigidity region 41, the number of stacked sheets becomes larger than that in the low rigidity region 42, and the difference in rigidity between both the regions 41 and 42 becomes clear. The auxiliary sheet 70 may be fixed not to the skin facing surface side of the side sheet 25 but to the non-skin facing surface side, and may be formed from a plurality of sheets instead of one sheet.

In addition to the materials described in the specification, various known materials that are usually used in this type of article can be used without limitation for each component member constituting the diaper 10 of the present invention. In the specification and claims, the terms “first” and “second” are used only to distinguish similar elements, positions, and the like.

DESCRIPTION OF SYMBOLS 10 Diaper 11 Front waist area 12 Rear waist area 13 Crotch area 14 Waist opening 15 Leg opening 16 Diaper main body 17 Waist belt 18A, 18B Joining line 21 Inner layer sheet 22 Outer layer sheet 23 Absorber 25 Side sheet 26 Leg elastic body 30 Elastic sheet 33 Waist elastic body 40 Side flaps 41 High rigidity region 42 Low rigidity region 70 Elastic sheet P Vertical center line X Horizontal direction Y Vertical direction

Claims (7)

  1. A diaper main body having a longitudinal direction and a lateral direction, and a longitudinal center line that bisects the lateral dimension, a front and rear waist region, a crotch region located between the front and rear waist regions, and an absorbent body; In a disposable diaper comprising a pair of waist belts for connecting the front and rear waist regions, a waist opening and a pair of leg openings,
    The pair of waist belts are joined to the diaper main body through a joining line in which the distance between the waist opening regions decreases from the leg opening side toward the waist opening side,
    The diaper main body has side flaps extending in the longitudinal direction outside the lateral edges of both side edges of the absorbent body, and the side flaps are compared to other regions at edges extending along the leg openings. The diaper is characterized by having a high rigidity region having high rigidity, and both end portions of the high rigidity region are located on the joining line.
  2. The diaper main body includes a liquid-permeable inner layer sheet, a liquid-impermeable outer layer sheet, the absorber positioned between the inner and outer layer sheets, and a pair of side sheets disposed on both sides of the absorber. The diaper according to claim 1, wherein the high rigidity region is formed by disposing a separate elastic sheet on the side sheet.
  3. The side sheet includes a first sheet positioned on the skin facing surface side and a second sheet positioned on the non-skin facing surface side, and the elastic sheet is positioned between the first and second sheets. The diaper according to claim 1 or 2.
  4. The diaper according to claim 1 or 2, wherein the elastic sheet is disposed on at least one of a skin facing surface side and a non-skin facing surface side of the side sheet.
  5. The diaper according to any one of claims 1 to 4, wherein a plurality of leg elastic bodies extending in the longitudinal direction are arranged in the high rigidity region.
  6. The leg elastic body is disposed between sheet members stacked in the high rigidity region, and a plurality of waist elastic bodies are disposed on the waist belt, and the leg elastic body and the waist elastic body are disposed. The diaper according to claim 5, wherein the body does not overlap each other in the thickness direction of the sheet member.
  7. The diaper according to any one of claims 1 to 6, wherein a width dimension of the high rigidity region is 3 to 30 mm.
PCT/JP2015/086348 2014-12-26 2015-12-25 Disposable diaper WO2016104753A1 (en)

Priority Applications (2)

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JP2014-266711 2014-12-26
JP2014266711 2014-12-26

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JP2016566547A JP6479049B2 (en) 2014-12-26 2015-12-25 Disposable diapers
CN201580071171.6A CN107106376A (en) 2014-12-26 2015-12-25 Disposable diapers
KR1020177016998A KR20170098230A (en) 2014-12-26 2015-12-25 Disposable diaper

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WO2016104753A1 true WO2016104753A1 (en) 2016-06-30

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JP (1) JP6479049B2 (en)
KR (1) KR20170098230A (en)
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WO (1) WO2016104753A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0910261A (en) * 1995-06-29 1997-01-14 Zuiko:Kk Disposable wearing article and manufacture therefor
JP2004533886A (en) * 2001-06-29 2004-11-11 ザ プロクター アンド ギャンブル カンパニー The disposable absorbent garment having leg openings and finishing the outer leg cuffs with a highly extensible
JP2008511412A (en) * 2004-09-01 2008-04-17 ザ プロクター アンド ギャンブル カンパニー Edge band for absorbent article and manufacturing method
JP2013230263A (en) * 2012-04-27 2013-11-14 Unicharm Corp Disposable diaper

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7314967B2 (en) * 2004-05-26 2008-01-01 The Procter & Gamble Company Moisture responsive sealing members in disposable absorbent articles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0910261A (en) * 1995-06-29 1997-01-14 Zuiko:Kk Disposable wearing article and manufacture therefor
JP2004533886A (en) * 2001-06-29 2004-11-11 ザ プロクター アンド ギャンブル カンパニー The disposable absorbent garment having leg openings and finishing the outer leg cuffs with a highly extensible
JP2008511412A (en) * 2004-09-01 2008-04-17 ザ プロクター アンド ギャンブル カンパニー Edge band for absorbent article and manufacturing method
JP2013230263A (en) * 2012-04-27 2013-11-14 Unicharm Corp Disposable diaper

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JP6479049B2 (en) 2019-03-06
CN107106376A (en) 2017-08-29
JPWO2016104753A1 (en) 2017-10-12
KR20170098230A (en) 2017-08-29

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