JPH11146895A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper by which the leakage of feces is effectively prevented. SOLUTION: The disposable diaper 1 is provided with a liquid permeable top sheet, a back sheet facing it, an absorptive main body 3 having an absorbing body, which is arranged between the sheets and a water repellent most external layer sheet 2 which is joined with the absorptive main body 3 so as to execute holding by putting the absorptive main body on a wearing person around his waist at the time of wearing. The respective both side edge parts of a belly side part positioned at the belly side of the most external layer sheet 2 and a back side part positioned at a back side are joined and fixed so as to form a waist opening part 11 and a pair of leg opening parts 7 and 7. The most external layer sheet 2 is formed through the use of nonwoven cloth, an extending/contracting elastic member (a third elastic member) 13 is arranged so as to form leg gathers 13a and parts where the leg gathers 13a are formed in the most external layer sheet 2 are separated from the back sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper, and more particularly to a disposable diaper used for infants, adults and incontinent persons.

[0002]

2. Description of the Related Art A conventional disposable diaper includes, as disclosed in Japanese Patent Publication No. 52-40267, a liquid-permeable top sheet and a liquid-impermeable back sheet.
A diaper main body is constituted from the absorbent body located between these two sheets, a stretchable elastic member is arranged on a side flap extending to the left and right of the diaper main body to form a gather, and a back side of the side flap In general, a so-called flat type diaper intended to improve fit and leakproofness by disposing fasteners at both side edges of the diaper so as to be adjustable. Further, as disclosed in Japanese Patent Application Laid-Open No. 62-250201, there has been known one in which the gathers of the leg portion are three-dimensionally formed, and the flap portion around the absorber is made water-repellent to enhance the leakage prevention effect. .

Recently, however, as disclosed in Japanese Patent Application Laid-Open No. 57-77304, the abdominal region and the dorsal region of a pair of left and right side flaps have been designed to improve fit and fit. A so-called pants-type disposable diaper has been proposed in which a pair of left and right leg openings and a waist opening are respectively formed by bonding and fixing. The pants-type disposable diaper is configured such that a leg opening and a waist opening are formed to be extendable and contractable, respectively, to fit a body shape. Such pants-type disposable diapers can usually be worn by the wearer in an upright position, and can be used for toilet training to promote the infant's "diaper detachment", or for incontinent persons or people who have difficulty walking. It is considered useful for possible adults.

[0004]

However, in the above-mentioned conventional underpants-type disposable diaper, the crotch must be formed narrow, so that the elastic member cannot be arranged separately from the absorber. As a result, it was difficult to exhibit the original elastic properties due to the influence of the rigidity of the absorber. At the same time, wrinkles and gaps are apt to occur at the joints at both side edges due to the elastic members, which has caused the excrement to leak. In addition, three-dimensional leg gathers, which are effective as leak prevention measures, also have problems in that the crotch is narrow and there is difficulty in manufacturing. Water-repellent technology, which is effective as a measure to prevent exudates, especially urine from leaking out, is also necessary in pants-type diapers, because the crotch is narrow, so that the hydrophilic part and the water-repellent part are clearly distinguished. However, sufficient effects could not be exerted.
Furthermore, in the conventional method of manufacturing pants-type diapers,
It was impossible to provide a water-repellent portion at the waist.

Accordingly, it is an object of the present invention to provide a disposable diaper which can effectively prevent excrement leakage.

[0006]

According to the present invention, there is provided an absorbent body having a liquid-permeable top sheet, a back sheet opposed thereto, and an absorber disposed between the two sheets.
A disposable diaper, wherein the absorbent body is joined, comprising a water-repellent outermost layer sheet that surrounds the wearer's waist when worn and holds the absorbent body against the wearer,
The outermost layer sheet is formed using a nonwoven fabric, and elastic members are provided to form leg gathers.A part of the outermost layer sheet where the leg gathers are formed is isolated from the back sheet. The above object has been achieved by providing a disposable diaper characterized by the following.

[0007]

According to the disposable diaper of the first aspect, the absorbent main body is joined to the outermost layer sheet, the absorbent main body is applied to the crotch part of the wearer, and worn in the same manner as ordinary underwear. During the wearing, the leg opening of the outermost layer sheet of the pants-type fits the leg of the wearer by the leg gather, so that leakage from such a portion is surely prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, a first embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view of a disposable diaper according to a first embodiment of the present invention, FIG. 2 is a partially cutaway plan view of the disposable diaper shown in FIG. 1 in an unfolded state, and FIG. 3 is a perspective view of the disposable diaper shown in FIG. Sectional view cut along line III, FIG.
FIG. 4 is a cross-sectional view of the disposable diaper shown in FIG. 1 taken along line IV-IV.

A disposable diaper 1 according to a first embodiment of the present invention is a so-called pants-type disposable diaper, and FIG.
As shown in FIG. 1, the absorbent body 3 having the liquid-permeable top sheet 15, the back sheet 16 opposed thereto, and the absorber 17 disposed between the two sheets, and the absorbent body 3 is joined. And a water-repellent outermost sheet 2 which surrounds the wearer's waist when worn and holds the absorbent body against the wearer. Further, the disposable diaper 1 is formed by joining and fixing both side edges of the abdominal portion located on the abdominal side and the dorsal portion located on the dorsal side of the outermost layer sheet 2 to form a waist opening 11 and a pair of leg openings. Parts 7, 7 are formed. In the disposable diaper 1, as shown in FIG. 3, the outermost layer sheet 2 is formed using a nonwoven fabric, and an elastic elastic member (third elastic member) 13 is arranged to form a leg gather 13 a. The portion of the outermost sheet 2 where the leg gathers 13 a are formed is isolated from the back sheet 16. Here, each of the waist opening 11 and the leg opening 7 is a part formed in a form when worn as shown in FIG. 1. Therefore, in a so-called unfolded diaper, the fastening tape is stopped. When it is attached to form as shown in FIG. 1, it means a portion where an opening is formed in the same place as in FIG. 1.

The outermost layer sheet 2 is formed in a substantially rectangular shape having a size substantially larger than that of the absorbent main body 3, and the absorbent main body 3 is fixed to the substantially central portion in the longitudinal direction with an adhesive A. A concave notch 6 is formed on both sides to which the absorbent main body 3 is adhered, so that the leg openings 7 are formed when the pants type is formed. Recessed part 4
A pair of left and right side flaps 8, 8, 9, 9 extend outwardly in the width direction from both sides of the absorbent main body 3, respectively, above and below the constricted portion formed with.

The respective edges of the side flaps 8, 8, 9 and 9 are adapted to fuse the upper and lower side flaps 8 and 9 together at a joint to form a pants-type. In addition, a pair of waist flaps 1 extending outward from the absorbent main body 3 are provided on the edge portions of the outermost layer sheet 2 in the longitudinal direction.
0a and 10b are provided, and when the pants type is formed, the waist opening 11 is formed. Each of the waist flaps 10a and 10b has a second elastic member 1
The third elastic member 13 is provided in the concave portion 6 of the side flap.
The waist flap gathers 12
a, the gathers 13a of the leg portions are formed to enhance the fit to the wearer at the time of wearing, and to prevent slippage. Further, a fourth elastic member 14 is stretched between the waist opening 11 and the leg openings 7, 7 when worn, so as to enhance the fit around the wearer's waist.

The absorbent main body 3 is arranged so as to be located inside the third elastic member 13 stretched in the concave portion 6 when the absorbent main body 3 is bonded to the outermost layer sheet 2, and has a leg gather 13a and a crotch gather. 5 are sequentially formed without overlapping. The absorbent main body 3 includes a liquid-permeable top sheet 15 that forms a side in contact with the wearer's skin, a liquid-impermeable back sheet 16 corresponding to the top sheet 15, a top sheet 15, and a back sheet 16. And an absorber 17 interposed therebetween. The absorbent main body 3 has a pair of left and right main body flaps 18, 18 extending outward in the width direction from both side edges of the absorber 17, and the main body flap 1.
The first elastic members 4, 4 described above are stretched along the longitudinal direction of the absorbent main body 3 so as to form crotch gathers 5 on both side edges of 8, 18.

The main body flaps 18 are free ends, and the absorbent main body 3 has only a substantially central portion of the back sheet 16 adhered to the bottom surface of the main body flaps 18 so that the inseam gathers 5 can be formed.
Facilitates formation. The top sheet 15 is preferably a liquid-permeable sheet that allows excrement to pass through the absorber 17 and has a feeling similar to underwear. Examples of such a liquid-permeable sheet include a woven fabric, a nonwoven fabric, and a porous film. Are preferred. Also, a hydrophobic compound such as a silicone oil agent or paraffin wax is applied to the peripheral portion of the top sheet 15, or a hydrophilic compound such as an alkyl phosphate ester is applied in advance and the peripheral portion is washed with warm water to repel. By performing water treatment, it is possible to prevent leakage due to bleeding of urine and the like in the peripheral portion.

The back sheet 16 is a moisture-permeable liquid-impermeable sheet that is stretched by adding a filler to a thermoplastic resin;
Alternatively, a material having a feeling similar to underwear, for example, a composite material of a film and a nonwoven fabric or a composite material of a film and a woven fabric is used. The absorbent 17 is preferably composed mainly of fibrillated pulp and used in combination with a high-molecular-weight water-absorbing polymer, and is preferably a heat-treated mixture of a thermoplastic resin, cellulose fibers, and a high-molecular-weight water-absorbing polymer. The location of the high-molecular-weight water-absorbing polymer may be any of the upper layer, the middle layer, and the lower layer, and may be a mixture with pulp. The high-molecular water-absorbing polymer has a holding performance of absorbing and holding a liquid 20 times or more its own weight, and is preferably in the form of particles having a gelling property. For example, starch-acrylic acid (salt) graft copolymer, starch-acrylonitrile acid (salt)
Polymers and the like are preferred. The shape of the absorber 17 is preferably an hourglass shape that matches the body shape of the wearer, but may be rectangular.

The outermost layer sheet 2 is preferably a liquid-impermeable, air-permeable, highly flexible sheet having a feel similar to underwear, and is a non-woven fabric subjected to a water-repellent treatment. Also,
The outermost layer sheet 2 may be formed of only the nonwoven fabric,
A liquid-impermeable film obtained by laminating one or both sides of the liquid-impermeable film with a nonwoven fabric is excellent in the feel and the function of preventing leakage due to bleeding of urine and the like.

First, second, third and fourth elastic members 4, 1
2, 13, 14 are generally the absorbent body 3 in the extended state.
The outermost layer sheet 2 is bonded to the outermost layer sheet 2 by means known in the art such as ultrasonic welding, heat welding, and an adhesive. As the material,
Any material known in the art, such as thread rubber, flat rubber, film-type rubber or tape-like foamed polyurethane, may be used, and one or more may be used. It is particularly preferable that such an elastic member has a stress at the time of 150% elongation of 70 to 100 g. Adhesive A
A known adhesive or the like is used, and is adhered in a dot-like or linear manner inside the absorbent main body 3, preferably inside the absorber 17. As a material of the adhesive A, a hot melt adhesive, a styrene / butadiene copolymer, an acrylate copolymer, vinyl acetate, an ethylene / olefin copolymer, a petroleum resin, a cold glue, or the like is used.

Next, the operation of the first embodiment will be described. As shown in FIG. 1, the side edges of the side flaps 8 and 9 of the outermost layer sheet 2 in the unfolded state shown in FIG.
A pants-type diaper having a waist opening 11 and a pair of leg openings 7, 7 is formed. This outermost sheet 2
, The absorbent body 3 is adhered to the inside thereof with an adhesive A.

At the time of wearing, the pants-type diaper is pulled up by passing both feet through the waist opening 11, and the legs are worn through the leg openings 7,7. During the wearing, gathers are formed at the waist opening 11 and the leg openings 7, 7 of the outermost layer sheet 3, so that fit to the wearer, followability, and leakage prevention are achieved. Further, the fit of the fourth elastic member 14 to the wearer around the waist is improved.

During wear, crotch gathers 5 are formed in the absorbent main body 3 so that excretions and the like can be removed.
From the outermost layer sheet 2 is prevented. Further, since the double gathers are formed together with the leg gathers of the leg openings 7, 7 of the outermost layer sheet 2, the leakage is reliably prevented from the legs.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

[0021]

According to the disposable diaper of the present invention, it is possible to provide a disposable diaper capable of effectively preventing excretion from leaking.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disposable diaper according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of the disposable diaper shown in FIG. 1 in a developed state.

FIG. 3 is a sectional view of the disposable diaper shown in FIG. 1 taken along the line III-III.

FIG. 4 is a cross-sectional view of the disposable diaper shown in FIG. 1 taken along line IV-IV.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 21 Disposable diaper 2, 22 Outermost layer sheet 3, 23 Absorbent main body 4 First elastic member 5 Inseam gather 12 Second elastic member 12a Waist gather 15 Top sheet 16 Back sheet 17 Absorbent A Adhesive 25 Central area

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI A41B 13/02 K

Claims (5)

[Claims] 1. An absorbent body having a liquid-permeable top sheet, a back sheet opposed thereto, and an absorber disposed between the two sheets, and the absorbent body is joined and worn when worn. A disposable diaper having a water-repellent outermost layer sheet surrounding the waist of the user and holding the absorbent body against the wearer, wherein the outermost layer sheet is formed using a nonwoven fabric, and is a stretchable elastic member. Are disposed to form a leg gather, and a portion of the outermost layer sheet where the leg gather is formed is isolated from a back sheet. 2. A side edge along the longitudinal direction of the absorbent main body is a free end, and a crotch gather is formed in a crotch part which rises upward when worn by arranging an elastic member at least on the both side edges. Disposable diapers characterized by the following. 3. The waist opening of the outermost layer sheet,
The disposable diaper according to claim 1, wherein a waist gather is formed by an elastic member. 4. A waist gather which is formed between a waist opening and a leg opening of the outermost layer sheet by a stretchable elastic member to tighten a waist around a wearer. The disposable diaper described in Crab. 5. The disposable diaper according to claim 1, wherein the back sheet is water-repellent.