JPH08663A - Disposable diaper having pocket structure - Google Patents

Abstract

PURPOSE:To provide a disposable diaper which has an excrement housing pocket in a central part and by which leakage is hardly caused and a skin touch is improved. CONSTITUTION:Hydrophobic surface sheets 5 are fixed on a surface sheet, and a hydrophilic surface sheet 2 is arranged in a width directional center area of a diaper, and the hydrophobic surface sheets 5 are arranged in width directional both side areas of the diaper, and in the hydrophobic surface sheets 5, two sheets having crest parts and valley parts are opposed to each other, and the crest parts are arranged so as to be partially superposed on each other in an end part, and the valley parts are opposed to each other, and a pocket 6 is formed in a central part. Both sides of the central hydrophilic surface sheet 2 are upward folded back, and the folded-back parts and pocket part side edge parts of the hydrophobic surface sheets 5 are superposed on each other, and an extensile-contractile elastic body 7 is sandwiched in and adhered to the superposed part while keeping an elongated condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper for children or adults. More specifically, it has a pocket for storing excrement in the central portion of the diaper, and there is little leakage so that it does not damage the skin. The present invention relates to a disposable diaper with reduced pleasure.

[0002]

2. Description of the Related Art A disposable diaper having a pocket structure has been developed by the present inventors.
There are those disclosed in Japanese Patent No. 218751, Japanese Patent Application Laid-Open No. 4-150853, and the like.

Among them, for example, JP-A-4-150853
The one described in No. 1 is a disposable diaper in which an absorbent core is arranged between a front sheet and a back sheet, and the front sheet is composed of three sheets, of which One sheet is made up of a hydrophilic sheet (center surface material) that is approximately the same length as the absorbent core and is attached to the upper surface of the core, and the other two sheets are installed on the hydrophilic sheet. It is composed of a hydrophobic sheet (pocket surface material and its lining material) that covers the upper surface of the absorbent core, and a pocket for excrement is formed in the central area of the hydrophobic sheet. In addition to being provided, a stretchable elastic body that gives a contracting force is attached to both sides of the pocket so as to open the pocket upright.

In this diaper, a stretchable elastic body is sandwiched between a hydrophobic pocket surface material and a lining material and bonded to form a pocket gather. Since a hot melt adhesive is used, it is necessary to attach a backing material to the pocket surface material. Conventionally, this backing material is formed of a material different from the pocket surface material. When continuously producing diapers, the lining material is unwound from a winding other than the pocket surface material, and the stretchable elastic body is bonded between the pocket surface material and the lining material while keeping the stretched state. , If the backing material is made of a different material, the number of materials and the number of winding stands increase, so that the bonding process of the pocket gathers becomes considerably complicated.

The above-mentioned diaper is characterized in that a pocket for dropping excrement is provided in the central region of the hydrophobic sheet. In that case, the center of the pocket surface material is bored ( It must be cut out to form pockets. This hole boring consumes a considerable amount of surface material for forming pockets, and in addition, it takes a lot of trouble to process the cut material.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention has a pocket for storing excrement by reducing the amount of materials used and the number of stands so that there is little leakage and the discomfort to the skin is reduced. The purpose is to easily and economically manufacture a reduced disposable diaper.

That is, according to the present invention, both ends of the central hydrophilic sheet (center surface material) attached to the upper surface of the absorbent core are folded back and used as a backing material for the pocket surface material when forming pocket gathers. Is.

Further, according to the present invention, at the time of manufacturing a diaper, two corrugated pieces formed by cutting the central portion of the surface material with a cutting line having an S-shape in the longitudinal direction are developed, one of which is halved.
We propose a disposable diaper that uses less material than the conventional one in which the peak is formed by cutting (cutting out) the center of the surface material by shifting the wavelength and only overlapping part of the peaks. Has an aim.

Another object of the present invention is that the standing portion of the pocket for storing excrement is reinforced by a continuous and erected structure of the center surface material, and the multi-layer structure of the surface material allows the excrement to reach the skin. The purpose is to propose a disposable diaper that can reduce reversion.

[0010]

In order to achieve the above object, the diaper of the present invention is a diaper in which a liquid absorber is fixed between a liquid-impermeable back sheet and a hydrophilic top sheet. Further, a hydrophobic surface sheet is fixed on the surface sheet, the hydrophilic surface sheet is arranged in the widthwise central region of the diaper, and the hydrophobic surface sheet is arranged in both widthwise regions of the diaper, and The hydrophobic surface sheet is made by arranging two sheets with peaks and valleys facing each other, and arranging them so that the peaks partially overlap each other at the ends, with the valleys facing each other and a pocket at the center. Part of the hydrophilic surface sheet at the center is folded back upward, the folded back portion and the edge portion of the hydrophobic surface sheet on the pocket side are overlapped, and the gathered portion has pocket gathers. Is characterized in that the forming stretchable elastic member bonded sandwich while maintaining the extended state. The pocket is formed by cutting the center of the hydrophobic surface sheet with an S-shaped cutting line to unfold two formed corrugated pieces, one of which is 1
/ 2 The wavelength is shifted and the peaks are arranged so as to partially overlap each other.

[0011]

In the diaper of the present invention, the hydrophobic surface sheet is further fixed on the hydrophilic surface sheet, the hydrophilic surface sheet is arranged in the central region in the width direction of the diaper, and the hydrophobic surface sheet is the diaper. The hydrophobic surface sheets are arranged on both side regions in the width direction, and the two sheets each having a ridge portion and a valley portion are opposed to each other, and the ridge portions are partially overlapped at an end portion, Since a pocket is formed in the center, excrement is dropped into the pocket, and the hydrophobic surface sheets on the outer layers on both sides of the pocket prevent the excrement from returning to the skin. .
The stretchable elastic body for forming pocket gathers prevents the excrement from leaking over the pockets by opening the pockets upright. The standing portion of the pocket for storing excrement is reinforced by the continuous and erected structure of the center surface material, and the multilayer structure of the surface material reduces the return of excrement to the skin.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a developed plan view showing an embodiment of a diaper according to the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG.

A description will be given below with reference to FIGS. 1 and 2.
In the figure, reference numeral 1 is a liquid impermeable back sheet, 2 is a hydrophilic top sheet, and 3 is an absorber fixed between both sheets. When viewed from above, the back sheet has an hourglass shape in which the center portion is constricted inward, and an hourglass-shaped absorber 3 having a smaller area than the back sheet is placed in the center portion, and crotch gathers are formed on both side edges thereof. Stretchable elastic bodies 4 are arranged, and these are integrally bonded to the surface sheet.

Reference numeral 5 is a hydrophobic surface sheet which is fixed on the hydrophilic surface sheet 2. As shown in the figure, the hydrophilic surface sheet 2 is arranged in the widthwise central region of the diaper, and the hydrophobic surface sheet 5 is arranged in both widthwise regions of the diaper. The hydrophobic surface sheets 5 and 5 are arranged such that two sheets having peaks and valleys face each other, and the peaks are partially overlapped at the ends, and the valleys face each other at the center. By doing so, the pocket 6 for storing excrement is formed.

In this specification, the hydrophilic sheet 2 provided in the center portion in the width direction of the diaper may be referred to as a center surface material, and the hydrophobic sheet provided in both side regions in the width direction of the diaper for providing the pockets 6. 5 may be called a pocket surface material.

In the case of this embodiment, the opening of the pocket is
In the center of the surface material, expand two corrugated pieces formed by cutting along the longitudinal S-shaped cutting line, and shift one of them by 1/2 wavelength to overlap the peaks with each other. The pocket openings are formed by arranging them so that they face each other (see FIGS. 1 and 3). In this example, the pocket opening width is 70 mm, the product width is 310 mm, the center surface material folding position (width) is 140 mm, and the center surface material folding width is 35 mm. By the way, the width (14) of the center surface material is 210 mm.

In the diaper of the present invention, both sides of the hydrophilic surface sheet (center surface material) 2 are folded back upward, and the folded back portion 2a and the edge portion of the hydrophobic surface sheet (pocket surface material) 5 on the pocket side. 2a is overlapped. That is, while the stretchable elastic body 7 for forming pocket gathers is kept in the stretched state, it is sandwiched in parallel with the longitudinal direction of the surface material and bonded by a hot melt adhesive to the overlapped portion, so that the center surface material is folded and used as a backing material. ing. Therefore, it is not necessary to wind another material or prepare a bearing stand. The stretchable elastic body 7 for forming pocket gathers is attached at a position 10 mm from the opening end of the pocket.

As the liquid impermeable back sheet 1 used in the present invention, for example, a polyethylene film, a water repellent non-woven fabric, a polylaminated non-woven fabric or the like is used, and as the hydrophilic top sheet 2, a dry non-woven fabric, a perforated film, A hydrophilic treated non-woven fabric of hydrophobic fibers or the like is used. The absorbent body 3 arranged between the two sheets is composed of two or more layers of absorbent fiber layers such as fluff pulp and rayon, and is usually a tissue paper and a dry pulp nonwoven fabric above and below the upper and lower absorbent bodies. It is used by arranging a water-permeable sheet made of, for example. Super absorbent particles can be arranged between the layers. The super absorbent polymer particles referred to herein are generally known super absorbent polymer particles alone or a mixture of them with activated carbon, carboxymethyl cellulose, zeolite or the like. The shape of the absorber in this embodiment is an hourglass shape with the center constricted, but the planar shape may be formed as a substantially rectangular shape as a whole. As the hydrophobic surface sheet 5, a hydrophobic fiber nonwoven fabric, for example, a polypropylene spunbonded nonwoven fabric material can be used.

As the stretchable elastic body 4 for forming the crotch gather and the stretchable elastic body 7 for forming the pocket gather, natural or synthetic thread-shaped or band-shaped rubber, urethane non-woven fabric, urethane foam and the like can be used. Between these sheets,
Bonding is performed using a water resistant adhesive such as a hot melt adhesive or a synthetic resin adhesive. It is also possible to use heat sealing or ultrasonic sealing.

FIG. 3 is an explanatory view showing each surface material and the step of forming the pocket gather portion. As can be seen from the figure, both sides of the center surface material 2 are folded back upward, and the folded back portion 2a and the pocket side edge 5a of the pocket surface material 5 are overlapped with each other, and a stretchable elastic body for pocket gather formation is provided therebetween. 7 is attached in an extended state in parallel with the longitudinal axis of the sheet. In addition, each surface material is integrated by the adhesive fixing portion 8 of the elastic elastic body 7, the overlapping adhesive portion 9 of the pocket surface material, and the adhesive portion 10 of the pocket surface material and the center surface material to integrate the lower back sheet 1, the absorber 3 or It is adhered to the stretchable elastic body 4 for forming the crotch gather.

In the embodiment of FIG. 4, the pocket opening width a is set to 1
This is an example in which it is set to 00 mm. Pocket depth (If the center surface material folding width is the same as in Fig. 3, the folding position a is 170 mm, and the center surface material width (14) a is 240 mm.
mm. In FIG. 5, the pocket opening width b is 70 mm, the center surface material folding width b is 50 mm, the folding position b is 170 mm, and the center surface material width (14) b is 2 mm.
This is an example of 70 mm.

The one shown in FIG. 3 (Embodiment 1) is
The amount of surface material used is the smallest of the three, products can be manufactured at low cost, and the small opening area of the pocket exposes the hydrophilic part (center surface material) 2 that gives discomfort to the skin after excretion. Can be made smaller. In the structure shown in FIG. 4 (embodiment 2), the storage capacity of the pocket can be made large, and the risk of excrement overcoming the pocket opening and leaking can be reduced. What is shown in FIG. 5 (Embodiment 3) is
Since the accommodation capacity of the pocket can be made large and the opening area of the pocket is small, the exposure of the hydrophilic portion (center surface material) 2 can be made small, so that discomfort after excretion is small.

[0023]

According to the present invention, both ends of the central hydrophilic sheet (center surface material) attached to the upper surface of the absorbent core are folded back to be used as a backing material when forming pocket gathers. Unlike conventional products, the amount of material used and the number of stands can be reduced.

Further, according to the present invention, at the time of manufacturing a diaper, two corrugated pieces formed by cutting the central portion of the surface material with a cutting line having an S-shape in the longitudinal direction are developed, and one of them is halved.
The material used can be reduced compared with the case where the pocket is formed by cutting (cutting out) the center of the surface material only by shifting the wavelength and partially overlapping the peaks.

According to the present invention, the standing portion of the pocket for storing excrement is reinforced by the continuous structure of the center surface material, and the multilayer structure of the surface material can reduce the return of excrement to the skin. In this respect, it has an industrially excellent effect.

[Brief description of drawings]

FIG. 1 is a developed plan view showing an embodiment of a diaper according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA in FIG.

FIG. 3 is an explanatory diagram showing a process of forming each surface material and a pocket gather portion.

FIG. 4 is an explanatory diagram showing a process of forming a surface material and a pocket gather portion which is a modified example of the present invention.

FIG. 5 is an explanatory diagram showing a process of forming a surface material and a pocket gather portion, which is a modified example of the present invention, similar to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Back sheet 2 Hydrophilic surface sheet 3 Absorber 4 Stretchable elastic body for crotch gather formation 5 Hydrophobic surface sheet 6 Pocket 7 Pocket gatherable stretchable elastic body 8 Adhesive fixing part 9 Adhesive part 10 Adhesive part

Claims (2)

[Claims] 1. A diaper having a liquid absorbent body fixed between a liquid-impermeable backsheet and a hydrophilic topsheet, wherein a hydrophobic topsheet is further fixed on the topsheet, The hydrophobic surface sheet is arranged in the central region in the width direction of the diaper, the hydrophobic surface sheet is arranged in both regions in the width direction of the diaper, and the hydrophobic surface sheet is provided with two peaks and troughs. Facing the seats,
And at the end, the peaks are arranged so as to partially overlap each other, the valleys are faced to each other, and a pocket is formed at the center,
Further, both sides of the central hydrophilic surface sheet are folded back upward, and the folded back portion and the pocket side edge of the hydrophobic surface sheet are overlapped, while the stretchable elastic body is maintained in the stretched state at the overlapped portion. A disposable diaper with a pocket structure characterized by being sandwiched and bonded. 2. A pocket is formed by cutting the center of a hydrophobic surface sheet with an S-shaped cutting line to develop two formed corrugated pieces, and shifting one of them by a half wavelength to form a mountain portion thereof. 2. The disposable diaper having a pocket structure according to claim 1, wherein the disposable diaper is formed by arranging so as to partially overlap.