JPH0630963A - Disposable diaper - Google Patents

Abstract

PURPOSE:To provide a disposable diaper which enables the changing of a stained part by excrements, effective prevention of leaked excrements and moreover, easy formation of a cubic gathering. CONSTITUTION:This disposable diaper 1 is provided with a top sheet 15, a back sheet 16, an absorbing body 3 arranged between both the sheets and an outermost layer sheet 2 which has the absorbing body 3 joined thereon so as to be kept on a wearing person. An absorbent 17 is shaped in the figure of a sandglass having a recess at the center thereof. Elastically stretching members are spread on both side rims of side flap parts 18 and 18 extending on both sides of the absorbing body while both the side rim parts of the side flap parts are folded to the side of the absorbent. Both longitudinal end parts 18a and 18a of the side flap parts are joined securely on the surface of the top sheet above the absorbent.

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 or incontinent persons.

[0002]

2. Description of the Related Art A conventional disposable diaper includes a liquid-permeable top sheet and a liquid-impermeable back sheet, as disclosed in, for example, Japanese Patent Publication No. 52-40267.
A diaper body is composed of an absorbent body located between these two sheets, and elastic members are arranged on side flaps extending to the left and right of the diaper body to form gathers, and the back side of the side flaps. Generally, a so-called flat type diaper intended to improve fitability and leakproofness is provided by disposing a fastener on both side edges of the diaper so as to be adjustable. Further, as disclosed in Japanese Patent Laid-Open No. 62-250201, it is known that the gathers of the leg portions are made three-dimensional, and the flap portions around the absorber are made water repellent to enhance the leakproof effect. .

However, recently, as disclosed in Japanese Patent Laid-Open No. 57-77304, the abdominal region and the dorsal region of a pair of left and right side flaps are mutually opposed for the purpose of improving fit and wearability. A so-called pants-type disposable diaper in which a pair of left and right leg openings and a waist opening are formed by joining and fixing is proposed. The pants-type disposable diaper is configured such that the leg opening and the waist opening are formed to be expandable and contractable to fit the body shape. Such pants-type disposable diapers can usually be worn by the wearer himself in an upright position, for toilet training to promote "diaper separation" of infants, or for incontinent or ambulatory persons. It is said to be useful for possible adult use.

[0004]

However, in the conventional pants-type disposable diaper described above, since the crotch part has to be formed narrow, the elastic elastic member cannot be arranged apart from the absorbent body. As a result, it was difficult to exhibit the original stretchable physical properties due to the influence of the rigidity of the absorber. At the same time, wrinkles and gaps are likely to occur at the joint portions of the both side edge portions due to the elastic elastic member, which causes excrement to leak. In addition, there is a problem in that the leg gather is three-dimensionally effective as a leakage prevention measure because the crotch is narrow and it is difficult to manufacture.

A peripheral water-repellent technique which is effective as a measure for preventing leakage of excrement, especially urine, also has a narrow crotch part in a pants-type diaper, which clearly distinguishes the hydrophilic part from the water-repellent part. Since it cannot be formed, a sufficient effect could not be exhibited. Further, the conventional disposable diaper absorbs and retains excrement only in the vicinity of the urination point, only such a portion is soiled, and other portions, for example, the side portions of the waist are not substantially soiled. Therefore, throwing away the entire diaper is wasteful and uneconomical.

Therefore, it is an object of the present invention to provide a disposable diaper which can effectively prevent the leakage of excrement and can easily form a three-dimensional gather. Another object of the present invention is to provide a disposable diaper in which only the soiled portion due to excrement can be replaced.

[0007]

SUMMARY OF THE INVENTION The present invention comprises a liquid-permeable topsheet, a liquid-impermeable and vapor-permeable backsheet opposed to the topsheet, and an absorber disposed between these sheets. An absorbent main body having, and an outermost layer sheet which is joined to the absorbent main body and surrounds the waist of the wearer when worn and holds the absorbent main body against the wearer, and the ventral side portion of the outermost layer sheet and A disposable diaper having a waist opening and a pair of leg openings formed by joining and fixing both side edges of each of the back side portions, wherein the shape of the absorber is an hourglass shape having a recess in the center in the longitudinal direction, Stretchable elastic members are stretched in the longitudinal direction at both side edges of the side flaps extending to both sides in the width direction of the absorbent main body, and both side edges of the side flaps having the stretchable elastic members are stretched. Part is on the absorber side The object is achieved by providing a disposable diaper, which is folded back and has both longitudinal ends of the folded back side flap portion bonded and fixed to the surface of the top sheet above the absorber. It was done.

[0008]

In the disposable diaper according to the first aspect, the absorbent body is joined to the outermost layer sheet, the absorbent body is applied to the crotch of the wearer, and the disposable diaper is worn in the same manner as normal underwear. During wearing, the side flap portion of the absorbent main body is erected by the elastic force of the elastic elastic members arranged on the both side edges of the absorbent body to form a bag-shaped three-dimensional gather for holding excrement. It Such a bag-shaped three-dimensional gather is easily formed with a simple configuration in which elastic elastic members are stretched on both side edges of the side flaps, and the both ends in the longitudinal direction are joined and fixed by folding it. can do.

According to the second aspect of the invention, since the second leg gather is formed on the outermost layer sheet,
The leakage of excrement can be surely prevented. According to the disposable diaper of claim 3, since the absorbent main body can be separated from the outermost sheet, the outermost sheet can be reused by exchanging with another absorbent main body after excretion. is there.

[0010]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 1 is a perspective view of a disposable diaper of an embodiment of the present invention, FIG. 2 is a plan view of the disposable diaper shown in FIG. 1 in an unfolded state, and FIG. 3 shows a method for manufacturing the absorbent main body shown in FIG. 4 is a plan view showing the absorbent main body shown in FIG. 1, and FIG. 5 is a state in which the absorbent main body shown in FIG. 4 is in use, and is cut along line IV-IV in FIG. FIG. 6 is a cross-sectional view showing a portion of the absorbent main body shown in FIG. 4, which is a usage state of the absorbent main body shown in FIG.

Disposable diaper 1 according to an embodiment of the present invention
Is a so-called pants-type disposable diaper, and as shown in FIGS. 1 and 2, a liquid-permeable top sheet 15 and
An absorbent main body 3 having a liquid-impermeable and vapor-permeable back sheet 16 opposite thereto and an absorber 17 arranged between the both sheets, and the absorbent main body 3 is joined and worn when worn. The absorbent body 3 surrounding the waist of the wearer
The outermost layer sheet 2 for holding the wearer against the wearer is provided, and the waist opening 11 and the pair of leg openings 7 are formed by joining and fixing both side edges of the ventral side portion and the back side portion of the outermost layer sheet 2. 7 is formed, and the shape of the absorbent body 17 is an hourglass shape having a recess in the center in the longitudinal direction, and the side flap portions 18, 18 extending on both sides in the width direction of the absorbent body 3 are disposed. Elastic elastic members (hereinafter referred to as second elastic elastic members) 26, 26 are stretched along the longitudinal direction on both side edges, and both side edges of the side flaps 18, 18 having the elastic elastic members are stretched. The portion is folded back to the absorber side, and both longitudinal end portions 18a, 18a of the folded back side flap portion are joined and fixed to the surface of the top sheet 15 above the absorber.

An elastic elastic member (hereinafter referred to as a first elastic elastic member) 24 is stretched on both side edges of the outermost sheet 2, and the first elastic elastic member 24 forms a first leg gather 24a. Has been done. The outermost layer sheet 2 is
The absorbent main body 3 is formed in a substantially quadrangular shape having a size substantially larger than that of the absorbent main body 3, and the absorbent main body 3 is detachably fixed to the approximate center in the longitudinal direction by an adhesive. Absorbent body 3
The recessed portions 6 are formed on both side portions to which the are bonded so that the leg openings 7 are formed when the pants type is formed. A pair of left and right side flaps 8, 8 and 9, 9 extend outward in the width direction from both sides of the absorbent body 3 above and below the constricted portion where the recessed portion 6 is formed. ing.

The respective side edges of the side flaps 8, 8 and 9, 9 are adapted to be fused together at the joints of the upper and lower side flaps 8, 9 to form a pants type. In addition, at both end edges in the longitudinal direction of the outermost layer sheet 2,
A pair of waist flaps 10a, 10b extending outward of the absorbent main body 3 are provided, and when a pants type is formed,
A waist opening 11 is formed. The waist flaps 10a and 10b are respectively stretched with a third stretch elastic member 12, and the recesses 6 of the side flaps are stretched with the above-described first stretch elastic member 24. The waist flap gathers 12a and the first leg gathers are respectively stretched. 24a is formed to improve the fit to the wearer when worn and prevent slipping. Also, the waist opening 1 when worn
1 and the leg openings 7, 7 between the fourth elastic member 1
4 is stretched to enhance the fit of the wearer's waistline.

When the absorbent main body 3 is bonded to the outermost layer sheet 2, the first stretchable elastic member 24 stretched over the recessed portion 6.
The first leg gathers 24a and the second leg gathers 26a are formed so as not to overlap one another in order. The absorbent main body 3 is a liquid-permeable topsheet 15 that forms the side that contacts the wearer's skin.
And a corresponding liquid-impermeable backsheet 16 of the topsheet 15 and an absorber 17 interposed between the topsheet 15 and the backsheet 16, and as shown in FIG. As a whole, it is formed in a substantially quadrangular shape, and the absorber 17 is formed in an hourglass shape having a concave portion at the center in the longitudinal direction.

The side flaps 18, 18 extending outward in the width direction of the absorber are provided with second stretchable elastic members 26 at both side edges thereof over both ends in the longitudinal direction.
The elastic member 26 has a distance M from both side edges of the side flaps 18, 18 of 1 mm to 10 mm, preferably 2 mm to 5 mm.
It is located in the position. As shown in FIGS. 4 and 5, the both side edge portions 18a, 18a including the second elastic member 26 are arranged so that the topsheet 2 is located near the both side edge portions in the longitudinal direction of the absorber and above the absorber. Although folded back so as to overlap, the width N of the folded back portion is 5 mm to 50 mm, preferably 10 mm to 30 mm. This is because if the width N is less than 5 mm, sufficient bag-shaped gathers cannot be erected.
This is because the bag-shaped gather will be crushed if it is more than 0 mm.

In the folded portion of the side flap, both edge portions 18a, 18a in the longitudinal direction thereof are adhered to each other by the adhesive material A above the absorbent sheet. Adhesive length (application length of adhesive A) L
Has a dimension substantially equal to the length in the longitudinal direction of the hourglass-shaped wide portion, and the length L is 10 mm to 100 m.
m, preferably 20 mm to 60 mm.

The side flaps 18, 18 are free portions, and the absorbent main body 3 has a bottom surface,
Only the substantially central portion of the back sheet 16 is adhered to the central portion 20 of the outermost layer sheet 2 to facilitate the formation of the second leg gathers 26a and 26a in the free state.

Next, the materials of the main components of this embodiment will be described. The top sheet 15 is a body for absorbing excrement 1
It is preferable that the liquid-permeable sheet that permeates to No. 7 has a feel close to that of underwear, and as such a liquid-permeable sheet, for example, woven cloth, non-woven cloth, porous film and the like are preferable. Further, the top sheet 15 may be repelled by a method of applying a hydrophobic compound such as a silicone oil or paraffin wax to the peripheral edge portion, or a method of applying a hydrophilic compound such as an alkyl phosphate ester in advance and washing the peripheral edge with warm water. By applying water treatment, it is possible to prevent leakage due to bleeding of urine or the like in the peripheral portion.

The back sheet 16 is a liquid impermeable sheet having moisture permeability obtained by adding a filler to a thermoplastic resin, and a sheet having a feeling similar to underwear, for example, a composite material of a film and a non-woven fabric or a film and a woven fabric. A cloth composite material or the like is used. The absorbent 17 is preferably made of defibrated pulp as a main material and used in combination with a high-molecular water-absorbing polymer. In addition, it is preferably made of heat-treated mixture of thermoplastic resin, cellulose fiber and high-molecular water-absorbing polymer. The high water absorbing polymer may be present in any of the upper layer, the middle layer and the lower layer, or may be a mixture with pulp. The high molecular weight water-absorbing polymer is preferably in the form of particles having a retention property capable of absorbing and retaining a liquid 20 times or more its own weight and having a gelling property. For example, starch-acrylic acid (salt) graft copolymer, starch-acrylonitrile acid (salt) polymer and the like are preferable.

First, second, third, and fourth elastic members 2
4, 26, 12, and 14 are generally joined in a stretched state to the absorbent main body 3 and the outermost layer sheet 2 by means known in the art such as ultrasonic welding, heat welding, and adhesive. As a material, any material known in the art such as thread rubber, flat rubber, film-type rubber or tape-shaped foamed polyurethane may be used, and one or a plurality thereof may be used. It is particularly preferable that the elastic elastic member has a stress of 70 to 100 g at 150% elongation.

As the adhesive material A, a known peelable adhesive material or the like is used, and it is adhered in a dot shape or a linear shape inside the absorbent main body 3, preferably inside the absorbent body 17. As the material of the adhesive A, hot melt adhesive, styrene
Butadiene copolymer, acrylic ester copolymer, vinyl acetate, ethylene / olefin copolymer, petroleum resin, cold glue, etc. are used.

Next, the operation of this embodiment will be described.
Pants type in which the side edges of the side flaps 8 and 9 of the outermost sheet 2 in the unfolded state shown in FIG. 2 are joined to each other to form a waist opening 11 and a pair of leg openings 7 and 7 as shown in FIG. Form a diaper. The outermost layer sheet 2 has an absorptive main body 3 adhered to the inside by an adhesive A so as to be peelable. At the time of wearing, the pants-type diaper is pulled up by passing both legs through the waist opening 11 and passing through the legs through the leg openings 7, 7. During wearing, the waist flap gathers 12a in the waist opening 11 of the outermost layer sheet 3 and the leg openings 7, 7 are first in the leg openings 7, 7.
The leg gathers 24a are formed, and are designed to have a fit to the wearer, followability, and leakage prevention. Further, the fourth stretchable elastic member 14 improves the fit of the wearer around the waist.

Further, since the absorbent main body 3 is adhered to the outermost layer sheet only at the central portion thereof, the second elastic member 2 is stretchable.
6, the side flaps 18 are easily erected to form a bag-shaped three-dimensional gather, so that excrement can be reliably held in the bag-shaped portion. Moreover, the formation of such a three-dimensional gather can be easily manufactured by simply folding and adhering the flap portion on which the stretchable elastic member 26 is stretched, as shown in FIG.

While wearing the absorbent body 3, the
The leg gathers 26a are formed to prevent leakage of excrement or the like from the absorbent main body 3 to the outermost layer sheet 2.
Further, since the double gathers are formed together with the first leg gathers 24a of the leg openings 7 of the outermost layer sheet 2, reliable leakage prevention from the leg portions is achieved. Then, after excretion of the excrement, the absorbent main body 3 is peeled off from the outermost layer sheet 2, and a new absorbent main body 3 is adhered to the outermost layer sheet 2 for replacement. Thus, according to the first embodiment, it is possible to easily replace only the absorbent main body that is soiled with excrement.

[0025]

EFFECTS OF THE INVENTION According to the disposable diaper of the present invention, leakage of excrement can be effectively prevented, and moreover there is no swelling. Also,
According to the disposable diaper of the present invention, it is possible to replace only the soiled portion due to excrement.

[Brief description of drawings]

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

FIG. 2 is a plan view of the disposable diaper shown in FIG. 1 in an unfolded state.

FIG. 3 is a plan view showing a method for manufacturing the absorbent main body shown in FIG.

4 is a plan view of the absorbent main body shown in FIG. 1. FIG.

5 is a cross-sectional view showing a natural state of the absorbent main body shown in FIG. 3 and showing a portion cut along line IV-IV in FIG. 3. FIG.

6 is a cross-sectional view showing a natural state of the absorbent main body shown in FIG. 3 and showing a portion cut along line VV in FIG. 3. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Outermost layer sheet 3 Absorbent body 7 Leg opening 11 Waist opening 15 Top sheet 16 Back sheet 17 Absorber 18 Side flaps 18a Side edges of side flaps 26 Stretched on both side edges of side flaps Elastic elastic member

Claims (3)

[Claims] 1. An absorbent main body having a liquid-permeable top sheet, a liquid-impermeable and vapor-permeable back sheet opposite thereto, and an absorber arranged between these sheets, and the absorbent body. An outermost layer sheet to which the absorbent body is joined and surrounds the waist of the wearer when worn and holds the absorbent body against the wearer, and both side edges of the ventral side portion and the back side portion of the outermost layer sheet. A disposable diaper in which a waist opening and a pair of leg openings are formed by joining and fixing the absorbent body, and the shape of the absorbent body is an hourglass shape having a recess in the center in the longitudinal direction, and both sides in the width direction of the absorbent main body. Stretchable elastic members are stretched in the longitudinal direction on both side edges of the side flap portion extending to the side flap portions, and both side edge portions of the side flap portion having the stretchable elastic member are folded back toward the absorber side. , Folded Disposable diaper longitudinal ends of the side flaps is characterized in that it is joined and fixed to the surface of the above the top sheet of the absorbent body was. 2. The disposable diaper according to claim 1, wherein a stretch elastic member is provided in the leg opening of the outermost sheet, and leg elastic is formed by the stretch elastic member. 3. The disposable diaper according to claim 1, wherein the absorbent main body is detachably joined to the outermost layer sheet.