JPH0564651A - Disposable diaper - Google Patents

Abstract

PURPOSE:To provide a pants type disposable diaper which facilitates to prevent the exuding and leaking from a waist part with a handy construction. CONSTITUTION:A disposable diaper 1 has a liquid permeating top sheet 2, a non-liquid permeating backsheet 3, an absorbing body 4 positioned between both the sheets, front and rear waist parts 5a and 5b positioned in the perimeter of the absorbing body 4, elastic expandable members 8, 8, and 8 forming gathers at the left and right leg parts 6 and 7 while the front and rear waist parts 5a and 5b are joined securely at left and right ends thereof. In a pants type disposable diaper thus arranged, the back sheet 3 is extended longer than the end part 3a in the longitudinal direction of the top sheet 2 at least at one of the front and rear waist parts 5a and 5b while folded back onto the surface of the top sheet 2 to form a foldback part 3a positioned on the top of the absorbing body 4.

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 infants, adults or incontinent persons, and more particularly to a so-called pants type disposable diaper.

[0002]

2. Description of the Prior Art Generally, a pants-type diaper is disclosed in
As disclosed in Japanese Patent Laid-Open No. 207605, a liquid-permeable top sheet, a liquid-impermeable back sheet, and a vertically long main body composed of an absorber interposed between these sheets, In a pair of left and right side flaps formed on both sides along the longitudinal direction of the main body, a ventral side portion and a back side portion are joined and fixed to each other to form a pair of left and right leg openings and one waist opening. There is.

This type of pants-type diaper is constructed so that a pair of leg opening peripheral portions and one waist opening peripheral portion are respectively formed to be expandable and contractable so as to fit the body shape, and usually the wearer himself or herself. Since it can be worn in an upright position, it is used for toilet training to promote "diaper separation" of infants, or for incontinence or for walkable adults.

A hydrophilic topsheet is located inside the waist portion of such a pants-type diaper, and the contact surface with the wearer's body is hydrophilic.

[0005]

However, in the conventional pants-type diaper, since the inside of the waist portion is hydrophilic, there is an inconvenience that the excrement of the excrement leaks from the waist during wearing after excreting the excrement. there were. In order to prevent such leakage, it is conceivable to perform water-repellent treatment on the inside of the waist or to provide a separate water-repellent portion, but because of the complicated structure of the diaper, the conventional pants-type disposable diaper It was difficult to provide a water repellent part on the.

Therefore, an object of the present invention is to provide a simple structure,
It is an object of the present invention to provide a pants-type disposable diaper that can easily prevent leakage from the waist.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body located between these sheets, and front and rear surfaces located around the absorbent body. In a pants-type disposable diaper, which has elastic stretchable members that form gathers on the waist and left and right leg parts, and the front and rear waist parts are joined and fixed at both left and right ends, the backsheet is the front and rear parts. At least one of the waist portions of the top sheet is extended to be longer than the end portion in the longitudinal direction of the top sheet, and is folded back to the surface of the top sheet, and includes a folded-back portion positioned above the absorber. The above object is achieved by providing a characteristic disposable diaper.

[0008]

According to the pants-type disposable diaper of the present invention, excreted excretions are absorbed by the absorbent body through the top sheet while being worn, and the absorbed excrement is then absorbed by the absorbent body. Although it tries to bleed into the waist part gradually from inside the top sheet or over the top sheet from the edge part, the inside of the waist part is repelled by the extension part where the back sheet is folded back so as to completely cover the end part of the absorber. Since the water part is formed, it does not reach the top sheet from the end part of the absorber, and even if it oozes into the waist part through the top sheet, the water repellent part is in the shape of a bag. Bleeding leakage from such a portion is prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiments shown in FIGS. In each of the drawings, FIG. 1 is a perspective view showing an embodiment of the disposable diaper of the present invention, FIG. 2 is a plan view of the top sheet side showing a state in which the disposable diaper shown in FIG. 1 is expanded, and FIG. Sectional drawing which shows the state which cut | disconnected the disposable diaper shown in FIG. 4 along XY line, FIG.4, FIG.5, FIG.6 is sectional drawing which shows the other Example of this invention.

The disposable diaper 1 of this embodiment comprises a liquid permeable top sheet 2, a liquid impermeable back sheet 3 and
The absorbent member 4 located between the two sheets, the elastic front and rear waist members 5a and 5b and the left and right leg members 6 and 7 located around the absorbent member 4, and elastic elastic members 8, 8 and 8 for forming gathers. And front and rear waist portions 5a, 5b
In a pants-type disposable diaper in which the left and right ends are joined and fixed, the backsheet 3 extends longer than the end portion 3a in the longitudinal direction of the topsheet 2 in at least one of the front and rear waist portions 5a and 5b. The folded-back portion 3a which is taken out and folded back on the surface of the top sheet 2 and is located above the absorber 4.
It is characterized by having.

The top sheet 2 has a body 4 for absorbing excrement.
It is preferable that the liquid permeable sheet to be permeated to have 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.
As the back sheet 3, a liquid-impermeable and vapor-permeable vapor-permeable film sheet 10 obtained by adding a filler to a thermoplastic resin and stretching, or a fiber assembly is used.
Since the back sheet 3 is located on the skin side in the folded-back portion 3a, it is preferable that the back sheet 3 has a feeling close to that of underwear.

The length of the back sheet 3 in the longitudinal direction is longer than that of the top sheet 2. That is, in the back sheet 3, the folded-back portion 3a extends from the end portion of the top sheet 2 to the end portion of the absorber. Has been extended to.
The width S from the end of the absorber to the end of the folded portion 3a is 10 mm
To 80 mm, preferably 30 to 50 mm. If the width S is smaller than 10 mm, the leakproofness is insufficient, and 8
This is because if it is longer than 0 mm, the absorbency of the absorber is hindered.
At this time, the width L of the folded portion 3a is 20 mm to 80 mm in the disposable diaper for infants, and preferably 3
It is 0 mm to 80 mm.

As described above, the end portion (folded portion) 3a of the backsheet 3 is folded back to the topsheet side and fixed by adhesive so as to cover the end portion of the absorber, whereby the water-repellent backsheet is placed inside the waist portion. As a result, the bag-shaped water repellent portion is formed inside the waist portion. The absorber 4 is
It is preferable that the absorbent body 4 is formed in an hourglass shape having a narrowed center, and the absorbent body 4 is preferably composed of defibrated pulp as a main material and a high-molecular water-absorbing polymer in combination.
In addition, a material obtained by heat-treating a thermoplastic resin, a cellulose fiber, or a mixture of high molecular weight water-absorbing polymers is preferable.
The high-molecular 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 water-absorbing polymer is preferably in the form of particles having a property of absorbing and retaining a liquid 20 times or more its own weight and having a gelling property. As such a high-molecular water-absorbing polymer, starch-acrylic acid can be used. A saponified product of a (salt) graft copolymer, a crosslinked product of sodium carboxymethyl cellulose, an acrylic acid (salt) polymer and the like are preferable.

The elastic stretchable members 8, 8, 8 stretched over the waist portions 5a, 5b and the leg portions 6, 7 have a stretch ratio of 200% or more, and are made of a plurality of natural rubber, synthetic rubber, foamed polyurethane or the like. It is continuously joined to the topsheet 2 and the backsheet 3 as a thread or a band of a book. On the other hand, in the manufacturing process of such a pants-type disposable diaper, after the backsheet 3 is formed with the folded portion 3a having a long dimension in the longitudinal direction of the topsheet 2, the folded portion 3a is folded on the upper surface of the topsheet 2, The folded-back portion 3a is joined and fixed to the top sheet 2. Such joining and fixing is performed by adhesion, heat welding, or the like. As a result, an underpants type disposable diaper (prototype) in an expanded state as shown in FIG. 2 is formed. Such joining and fixing is performed by adhesion, heat welding, or the like.

As described above, in the process of manufacturing the prototype of the pants-type disposable diaper, the extending portion (folding portion) 3a of the back sheet 3 is simply folded back and bonded and fixed to the top sheet 2, so that it is easily manufactured. be able to.
The disposable diaper 1 of this embodiment described above is shown in FIG.
The left and right ends of the side flaps are joined to each other in the unfolded state to form a pants type as shown in FIG.

At the time of wearing, in the pants-type state shown in FIG. 1, the wearer's feet are passed through the waist portions 5a, 5b and then the leg portions 6, 7 and pulled up to be worn. In the state of being worn, the folded-back portion 3a is provided inside the waist portions 5a and 5b.
Since the water repellent part is formed on the top sheet 2 by
The water repellent portion prevents leakage of excrement exuding through the top sheet 2.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified without departing from the gist of the present invention. For example, as shown in FIG. 4, the backsheet 3 is
A composite body in which the layer of the resin film 11 is bonded to the fiber assembly 10 with the adhesive 12 may be used.
In this case, the fiber assembly 10 is arranged outside,
The skin contact surface side of the folded-back portion 3a is placed on the fiber assembly 10
If so, the contact feeling of the skin can be improved.

Further, as shown in FIG. 5, the back sheet 3
Is based on the fiber assembly 10 and is a composite body in which the layer of the resin film 11 is bonded only with the adhesive 12 only to the portion where the absorbent body 4 is located, and only the fiber assembly 10 at the end is the folded portion 3a. It may be one. Further, as shown in FIG. 6, only the portion where the absorber 4 is located is covered with the resin film 11
Alternatively, the fiber assembly 10 may be adhesively fixed to the end portion thereof with the adhesive 12, and only the fiber assembly 10 portion may be folded back as the folding portion 3a.

[0019]

According to the disposable diaper of the present invention, it is possible to easily prevent the leakage of leakage from the waist portion with a simple structure.

[Brief description of drawings]

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

FIG. 2 is a plan view showing a developed state of the disposable diaper shown in FIG.

FIG. 3 is a cross-sectional view showing a state in which the disposable diaper shown in FIG. 2 is cut along line XY.

FIG. 4 is a cross-sectional view of a disposable diaper according to another embodiment.

FIG. 5 is a cross-sectional view of a disposable diaper according to another embodiment.

FIG. 6 is a cross-sectional view of a disposable diaper according to another embodiment.

[Explanation of reference numerals] 1 disposable diaper 2 top sheet 3 back sheet 3a folding portion

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[Procedure amendment]

[Submission date] December 7, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

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[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 3

[Correction method] Change

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[Procedure amendment 3]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

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[Procedure correction 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

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The top sheet 2 has a body 4 for absorbing excrement.
It is preferable that the liquid permeable sheet to be permeated to have 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.
The back sheet 3 is a liquid impermeable film sheet, for example,
If, although a thermoplastic resin film sheet 1 0 vapor permeability resin filler was added and the liquid-impermeable stretching the transmitting steam is used, bar Kkushito 3 folded portion 3
In a, since it is located on the skin side, it is preferable that it has a feel close to that of underwear. Therefore, the back sheet 3 is
At least as in the embodiment shown in FIGS.
Also, the folded-back portion 3a has a water-repellent fiber aggregate (formed with water-repellent fibers).
The nonwoven fabric formed is preferable.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013] Thus, the back end of the sheet 3 (folded portion) 3a folded on the top sheet side, by junction fixed so as to cover the absorbent end, inside the water repellent backsheet waist portion The bag-shaped water repellent portion is formed inside the waist portion. Returned above
The portion 3a is fixed to the top sheet 2 by joining the above
Both ends of the portion 3a (both ends in the left-right direction in FIG. 2)
Is done in. Absorber 4 is preferably formed in an hourglass shape which is substantially central constricted, as the material of the absorber 4, the fibrillated pulp is composed primarily, not preferred is that a combination of high molecular water-absorbent polymer .. The location the upper layer of the high molecular water-absorbent polymer, the middle layer may be either lower, or may be mixed with pulp. The high-molecular water-absorbing polymer is preferably in the form of particles having a property of absorbing and retaining a liquid 20 times or more its own weight and having a gelling property. As such a high-molecular water-absorbing polymer, starch-acrylic acid can be used. Saponified product of (salt) graft copolymer,
A crosslinked product of sodium carboxymethyl cellulose, an acrylic acid (salt) polymer and the like are preferable.

[Procedure Amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

The elastic stretchable members 8, 8, 8 stretched over the waist portions 5a, 5b and the leg portions 6, 7 have a stretch ratio of 200% or more, and are made of a plurality of natural rubber, synthetic rubber, foamed polyurethane or the like. It is continuously joined to the topsheet 2 and the backsheet 3 as a thread or a band of a book. On the other hand, in the manufacturing process of such a pants-type disposable diaper, after the back sheet 3 is formed with the folded-back portion 3a having a long dimension in the longitudinal direction of the top sheet 2, and after the folded-back portion 3a is folded back on the upper surface of the top sheet 2, The folded-back portion 3 a is joined and fixed to the top sheet 2. Such joining and fixing is performed by adhesion, heat welding, or the like.
As a result, an underpants type disposable diaper (prototype) in an expanded state as shown in FIG. 2 is formed. Such joining and fixing is performed by adhesion, heat welding, or the like.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

The present invention is not limited to the above-mentioned embodiments, but can be variously modified without departing from the gist of the present invention. For example, as in the embodiment shown in FIG. 4, the back sheet 3, be with a complex formed by bonding a resin film sheet 10 with an adhesive 12 to the above-described water-repellent fiber assembly layer 20 Good. In this case, a layer of water repellent fiber aggregate
If 20 is arranged outside and the contact surface side of the skin in the folded back portion 3a is the layer 20 of the water-repellent fiber assembly,
The contact feeling of the skin can be improved.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

Further, as in the embodiment shown in FIG. 5, the backsheet 3 is basically composed of the layer 20 of the water repellent fiber assembly.
Only a portion where the absorber 4 is positioned resins Fimuru sheet 10
Layers are joined with adhesive 12 and both ends are water repellent fiber aggregates.
A complex of only the body of the layer 20, the water repellent of both ends of the complex
Only the layer 20 of the elastic fiber aggregate may be the folded-back portion 3a. Further, as shown in the embodiment of FIG. 6, only the portion where the absorber 4 is located is used as the resin film sheet 10 and the layer 2 of the water-repellent fiber assembly is provided with the adhesive 12 at the end thereof.
0 may be bonded and fixed, and only the layer 20 portion of the water-repellent fiber aggregate may be folded back as the folded portion 3a.

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

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[Figure 3]

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[Figure 4]

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[Document name to be corrected] Drawing

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[Figure 5]

[Procedure Amendment 12]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

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[Figure 6]

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Claims (3)

[Claims] 1. A liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber positioned between these sheets, front and rear waist portions and left and right leg portions positioned around the absorber. In a pants-type disposable diaper that has elastic stretchable members that form gathers in each, and the front and rear waist portions are joined and fixed at the left and right ends, respectively, the backsheet, in at least one of the front and rear waist portions, A disposable diaper comprising a folded-back portion that extends longer than an end portion in the longitudinal direction of the top sheet, is folded back to the surface of the top sheet, and is positioned above the absorber. 2. The back sheet is composed of a layer of a water repellent fiber assembly and a layer of a composite body of a film, and the layer of the water repellent fiber assembly is located on the side opposite to the top sheet. Item 1. The disposable diaper according to Item 1. 3. The disposable diaper according to claim 2, wherein the extending portion of the back sheet is made of only the layer of the water-repellent fiber aggregate.