JPS6285001A - Disposable diaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disposable diaper. More specifically, it relates to disposable diapers that are inexpensive and compact, with no leakage, improved fit in the crotch area.

(Background of the Invention) As is well known, disposable diapers consist of a liquid-permeable top sheet made of a nonwoven fabric such as polyester, polypropylene, or V-yon, and a liquid-impermeable back sheet made of a film such as polyethylene. A silk-like pad sandwiched between
They are made of absorbent materials such as water-absorbent paper and superabsorbent polymers, and are becoming widely used because they are convenient to carry.

These disposable diapers usually have elastic members attached along both side edges of the crotch area to prevent urine leakage.

Conventionally, disposable diapers generally referred to as elastic type diapers are known in which elastic members such as thread rubber are inserted into both side edges of the crotch section of the diaper and gears are provided at the lower abdomen section. In these cases, there is relatively little leakage into the crotch area. However, during use, the elastic members such as thread rubber get stuck in the legs and come in too close contact with the red, drooping, and bulging legs, resulting in poor breathability and problems such as stuffiness and diaper rash.

In addition, since the elastic member is processed into diapers in a stretched state, the productivity of diapers is poor, and there are also problems from a cost perspective.
In addition, the gears were placed near the crotch of the bag, which made it bulky and caused problems in packaging and carrying.

There are also known improved products that use elastic members that shrink when wet with water, but in this case, they only shrink when wet with urine, causing problems such as leakage from the armpits, or shrinking on one side and tightening the legs. There was a problem.

In order to solve the above-mentioned problems, the inventors of the present invention conducted extensive studies and discovered an inexpensive and compact disposable diaper that does not leak, fits snugly around the crotch area, and does not cause stuffiness or rash.The present invention. completed.

(Objective of the Invention) That is, the present invention solves the problems of conventional disposable diapers as described above, and provides an inexpensive and compact disposable diaper that is desirable as a disposable diaper. .

(Structure of the Invention) The present invention provides a disposable diaper having an absorbent material between a liquid-permeable front sheet and a liquid-impermeable back sheet I, which The cushioning sheet is fixed along the side edges of the cushioning sheet, and both longitudinal edges are folded upward inside the fixed portion of the cushioning sheet.
This disposable diaper is made by fixing the top sheet of the folded portion and the opposing top sheet at the crotch area.

The cushioning sheet in the present invention is used to improve the adhesion between the diaper and the crotch area, and is suitable for use in the crotch area. For this purpose, a foamed plastic sheet, non-woven fabric sheet, laminated paper, etc. can be used.

The cushioning sheet is fixed by hot-melt adhesive or heat-sealing between the top sheet and the back sheet at both longitudinal edges of the crotch of the diaper. After fixing the cushioning sheet in the liquid on both sides, fold back the top sheet of the diaper inside the cushioning sheet area, and then fold the top sheet of the folded side edge and the facing top sheet.
It is fixed by hot melt adhesive etc. on the inside part of the cushioning sheet from the fixed part.

The topsheets may be fixed to each other in the form of a plurality of dots in the center of the crotch region or in one spot.

When actually using the diaper of the present invention, the folded portion of the cushioning sheet is spread outward, and the diaper is worn so that the cushioning sheet portion fits snugly around the user's crotch.

As the foamable plastic sheet 1, any of foamable polyethylene, polystyrene, and polyurethane can be used, but a foamable polyethylene sheet is preferable from the viewpoint of flexibility and strength when folded. The thickness of the foamable plastic sheet 1- may be in the range of 0.5 to 50 mm, but preferably 0 to 2.0 mm. Also, the width of the foamable plastic sheet is 5 to 50 mm. The length may be within any range, but it is preferably 10 to 25 m.

Hydrophobic materials such as nylon, polyester, and polypropylene are good materials for nonwoven sheets, but
Even if it is a rayon-based material, the object of the present invention can be achieved as long as it has been subjected to 1.9 water treatment. Nonwoven fabrics that can be used include both wet and dry methods.
A nonwoven fabric produced by the needle pan process or the like is suitable because it can be made relatively thick. In addition, the sheet of cardboard may be a single sheet of paper or a so-called laminated paper made by laminating several sheets of paper, but it must be soft to the skin, and it must be soft to the skin, such as water-absorbing paper. A stack of several sheets of paper is suitable. Further, in order to make it waterproof, it is desirable that this sheet be treated with water repellent treatment. The thickness of both the nonwoven fabric sheet and the cardboard sheet may be in the range of α5 to 50 m, but preferably 1.5 m.
0~&0LIll. Also, the width of the sheet is 5
The length may be in the range of ~30 meters, but is preferably 10 to 25 meters. The length at both edges should cover the crotch area sufficiently.

Furthermore, the nonwoven fabric sheet or cardboard sheet fixed between the top sheet and the back sheet can be treated to be water repellent to prevent urine from leaking to the armpits. Commercially available silicone-based, fluorine-based, etc. can be used as clear water treatment agents.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIGS. 1 and 2 are developed plan views of a diaper with a portion of the top sheet cut away to explain an example of the disposable diaper of the present invention. FIG. 3 shows a cross-sectional view of the diaper shown in FIGS. 1 and 2 along line x-x', and FIG. XX' line of the diaper of the present invention (in Figures 1 and 2), in which both side edges are folded upward on the inside, and the top sheet of the folded part and the opposing top sheet are bonded at one point in the crotch area. FIG. 3 is a cross-sectional view showing the state of the point adhesive 6 when the both side line parts are expanded outward when the device is attached to a baby.

In FIGS. 1 to 3, numeral 1 is the top sheet, 2 is the back surface, 5 is the absorbent material, 4 is the foamed plastic sheet, 5 is the fastening tape, and 6 is the folded surface y.
) and the opposing top sheet are glued together to show the nine-point adhesive area.

The absorbent material 3 is made of cotton-like pulp, water-absorbent paper, and super-absorbent polymer, and usually the super-absorbent polymer is present in a layer or uniformly inside the cotton-like bulb, which is then covered with water-absorbent paper, and this absorbent material is The material is adhered to the back sheet 2 in a linear or planar form using a hot melt adhesive. Further, the foamable plastic 7-t 4 and the back sheet are fixed by hot-melt adhesion or heat-on adhesion. Further, a top sheet 1 made of a nonwoven fabric such as polyvarnish 7-1v is bonded to a back sheet 2, a foamable plastic sheet 4, and an absorbent 5 using a hot melt adhesive to integrate them. Furthermore, both sides of the diaper in the longitudinal direction are folded back inside the foamed plastic sheet 4, and the bottom surface sheet of the folded side edges and the facing surface sheet are bonded to each other using hot melt adhesive or the like, and the bonding points 6 are bonded. (See Figure 3). By doing so, it is possible to wrap the package in a folded state when wrapping it, but when putting it on a baby, the folded part should be spread outward as shown in Figure 6 (in this case, the crotch area should be The part where the dot bonding point 6 in the center is separated spreads out as shown in FIG. 3.) It becomes possible to shift the foamable plastic sheet 4 so that it extends over the baby's crotch area.

When a hydrophobic foamed plastic sheet is used, it is possible to prevent urine from leaking into the armpits. Furthermore, unlike when using an elastic material, the legs are not tightly tightened, so there is no problem of diaper rash or sores due to stuffiness.

The absorbent material 3 may be either rectangular (as shown in FIG. 1) or of the type shown in FIG. 2.

Example 1 A disposable diaper was prepared in which the shape of the absorbent material was rectangular as shown in FIG. 1 and the cross-sectional structure shown in FIG. 6. That is, on the inside of the cushioning sheet 4 on both sides of the diaper, both side edges are folded upward along the cushioning sheet, and the topsheet of the folded portion and the facing topsheet are placed one by one at the center of the crotch area. The point was fixed.

In Fig. 6, numeral 1 is the top sheet, 2 is the back side V+T,
4 is a foamable plastic sheet, 11 is water-absorbing paper, 12 is an upper layer cotton-like bulb, 15 is a lower layer cotton-like pulp, and 14 is a super absorbent polymer.

As the liquid-permeable nonwoven fabric 2, a polyester μ nonwoven fabric (manufactured by Kuraflex Co., Ltd.) weighing 25 g/kg was used, and 4. 7 sheets of highly water-absorbent polymer were evenly distributed and 2097@" moisture-resistant water-absorbing paper was used as the water-absorbing paper. Also, a foamed plastic sheet was made by Nippon Styrene Vapor Co., Ltd. with a thickness of 2.0 m and a width of 20 m. I used a mirror mat.

Twenty-four of the above diapers were given to seven babies aged from 4 months to 17 months, and urine leakage from the crotch during use was tested. For comparison, we also tested a commercially available product that uses gearsers that shrink when wet. The results are shown in Table 1.

The disposable diaper of the present invention is not only a diaper that can sufficiently prevent urine leakage, but also does not require stretching and attaching, unlike when attaching an elastic body, and therefore productivity can be increased. Not only that, but it is compact and convenient to carry without being bulky like when gears are attached. Moreover, it has the great advantage of reducing transportation costs.

[Brief explanation of drawings]

1 and 2 are for explaining an example of the disposable diaper of the present invention, and FIG. 3 is a developed plan view of the diaper with part of the surface y-1 cut away, and FIG. A cross-sectional view taken along the line XX' of the diaper shown in Fig. 2, and Fig. 4 show that both edges of the cushion sheet of the diaper shown in Figs. 1 and 2 are folded upward at any one of the fixed parts. FIG. 3 is a cross-sectional view of the diaper of the present invention in which the top sheet of the folded portion and the opposing top sheet are point-bonded at the center of the crotch area, at a portion corresponding to the line x-x' in FIGS. 1 and 2; FIG. 6 is a cross-sectional view showing the dot-bonded portion when both side edges are expanded outward when worn on a baby, and FIG. 6 is a cross-sectional view of a diaper having a structure different from that shown in FIG. 3. DESCRIPTION OF SYMBOLS 1... Top sheet, 2... Back sheet, 5... Absorbent material, 4... Foamed plastic sheet, 6... Adhesive part

Claims (1)

[Claims] 1. A disposable diaper having an absorbent material between a liquid-permeable top sheet and a liquid-impermeable back sheet; A cushioning sheet is fixed along the length of the cushioning sheet, both edges in the longitudinal direction are folded upward inside the fixed part of the cushioning sheet, and the top sheet of the folded part and the opposing top sheet are fixed at the crotch area. Throw away diapers. 2. The disposable diaper according to claim 1, wherein the cushioning sheet is a foamed plastic sheet. 3. The disposable diaper according to claim 1, wherein the cushioning sheet is a nonwoven fabric sheet. 4. The disposable diaper according to claim 1, 2, or 3, wherein the cushioning sheet has a thickness of 0.5 to 3 mm and a width of 5 to 30 mm.