JP3145153B2 - Disposable diapers - Google Patents

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 disposable diaper having improved waist fitting and preventing leakage from the waist. About diapers.

[0002]

2. Description of the Related Art In general, a disposable diaper is composed of a liquid-permeable top sheet, a liquid-impermeable leak-proof sheet, and an absorber located between these two sheets. A topsheet and a leak-proof sheet extend outward from both ends in the longitudinal direction of the absorber at the waist located at the waist, and the extension forms a waist flap (first flap). ing.

Conventional disposable diapers (first prior art)
In order to prevent leakage from the waist portion and improve fit of the waist portion, there is known a configuration in which a stretchable member is disposed between a surface sheet of the waist portion and a liquid-impermeable leakproof sheet. Have been. Further, Japanese Unexamined Patent Publication No. Sho 59-1
Japanese Patent No. 44601 (second prior art) discloses the above-mentioned first technique.
Discloses a technique in which a ventilation channel is formed in a waist portion to impart ventilation.

Japanese Unexamined Patent Publication No. 57-205504 (third prior art) discloses, as means for preventing leakage from the waist, a surface sheet and a leakage prevention sheet which are extended from the absorber to the outside and meet. There is disclosed a technique in which a liquid impermeable sheet is interposed so as to overlap the absorber. JP-A-61-275402 (the fourth prior art) discloses that
An elastomer film having a heat-unstable film state and a heat-stable elastic state is extended from an absorber, and is interposed between a liquid-permeable top sheet and a liquid-impermeable leakproof sheet. A waist portion is formed by interposing the absorber so as to overlap the absorber, and a waist portion extending from the absorber is applied with heat to impart elasticity to the waist portion. ing.

[0005] Japanese Patent Application Laid-Open No. 64-267012 (Fifth Prior Art) discloses a technique in which a waist is provided with a flap having elasticity, air permeability, and leakproofness.

[0006]

However, in the above-mentioned first prior art, although the fit of the waist is improved, the body fluid that has reached saturation at both edges of the absorber in the longitudinal direction of the diaper reduces the surface chassis. There is a risk that it may leak out of the waist through the waist, and the leakage prevention force at the waist is small.

[0007] The second prior art described above has the disadvantage that body fluids leak from the ventilation channels. In the above-mentioned third prior art, although the body fluid that has reached saturation at both edges of the absorbent body in the longitudinal direction of the diaper has a large leakage prevention force, it has a poor fit at the waist portion, so that the leakage is reliably prevented. Can not.

In the above-mentioned fourth prior art, since heat is applied to give elasticity to elasticity, sufficient elasticity cannot be obtained, so that leakage occurs and sufficient elasticity is obtained. Attempting to achieve this has the problem that the part to which heat has been applied becomes hard, which hinders the feeling of wearing. In the fifth conventional technique described above, the leakage prevention force of the bodily fluid that has reached saturation at both ends of the absorber in the diaper longitudinal direction is small,
Further, there is a problem that the manufacturing cost is further increased.

Accordingly, an object of the present invention is to provide a disposable diaper capable of improving the fit at the waist and reliably preventing leakage at the waist.

[0010]

SUMMARY OF THE INVENTION The present invention comprises a liquid-permeable topsheet, a liquid-impermeable leakproof sheet, and an absorber located between these two sheets. In the disposable diaper having a waist portion located at the waist, the waist portion is formed such that the topsheet and the leak-proof sheet extend outward from at least one longitudinal end of the absorber. One flap is provided, and between the top sheet and the leak-proof sheet forming the first flap, a hydrophobic material is provided so as to open outward between the top sheet and the leak-proof sheet. A second flap made of a sheet is disposed in a V-shape, and a part of the second flap is overlapped on an end surface of the absorber, and the first flap at the V-shaped opening end is provided. The flap and the second flap Between, by providing a disposable diaper, characterized in that the elastic member expands and contracts in the circumferential direction of the waist portion is provided, in which to achieve the above objects.

In the present specification, “V-shaped” means
This is a concept of a substantially V-shape in which one is closed and the other is open, and also includes a U-shape.

[0012]

According to the disposable diaper according to the present invention, the excrement excreted in the disposable diaper is absorbed by the absorbent through the topsheet while the diaper is being worn. The absorbed excrement then tries to ooze from the end of the absorber between the top sheet of the first flap and the leak-proof sheet, but the second flap made of a hydrophobic sheet covers the end of the absorber and is V-shaped. Since they are arranged in a shape, they prevent seepage from the ends of the absorber.

Further, since an elastic member is disposed between the first flap and the second flap, the elastic member has an improved fit at the waist.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing one embodiment of the disposable diaper of the present invention, FIG. 2 is a plan view of a top sheet showing a state where the disposable diaper shown in FIG. 1 is developed, and FIG. 3 is a waist of the disposable diaper shown in FIG. FIG. 4 is a perspective view showing a cut-away waist portion, and FIG. 5 is a perspective view showing a cut-away waist portion of a disposable diaper according to another embodiment.

The disposable diaper 1 of the present embodiment has a liquid-permeable top sheet 2, a liquid-impermeable leak-proof sheet 3, and an absorber 4 located between these two sheets. The waist portions 5a and 5b are located on the waist of the user, and the waist portions 5a and 5b are provided with the topsheet 2 and the leak-proof sheet 3 outside at least one end in the longitudinal direction of the absorber 4. The first is formed by extending
A flap 6 is provided, and between the top sheet 2 and the leak-proof sheet 3 forming the first flap 6,
A second flap 7 made of a hydrophobic sheet is arranged in a V-shape so as to open outward between the top sheet 2 and the leak-proof sheet 3, and a part of the second flap 7 is formed as described above. An elastic member 9 which is superposed on the end surface of the absorber and extends and contracts in the peripheral direction of the waist portion between the first flap 6 and the second flap 7 at the V-shaped opening end. It is characterized by being arranged.

The topsheet 2 is preferably a liquid-permeable sheet that allows excrement to pass through the absorber 4 and has a feel similar to underwear. Such a liquid-permeable sheet may be, for example, a woven cloth or a nonwoven cloth. And a porous film are preferred. As the leak-proof sheet 3, a liquid-impermeable and vapor-permeable film sheet or fiber aggregate that is made by adding a filler to a thermoplastic resin and stretched is used.

The absorbent body 4 is formed in a rectangular shape extending in the longitudinal direction of the disposable diaper, and both ends in the longitudinal direction extend to the front and rear waist portions 5a and 5b. The shape of the absorber 4 may be an hourglass type with a center constricted to fit the crotch of the wearer. As the material of the absorbent body 4, a material containing a defibrated pulp as a main material and a polymer water-absorbing polymer is preferably used. In addition, a material obtained by heat-treating a mixture of a thermoplastic resin, cellulose fiber, or a polymer water-absorbing polymer is preferable. 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 performance of absorbing and retaining a liquid at least 20 times its own weight, and is preferably in the form of particles having a gelling property. (Salt) A saponified product of a graft copolymer, a crosslinked product of sodium carboxymethyl cellulose, an acrylic acid (salt) polymer and the like are preferable.

The formation of the first flap 6 and the second flap 7 is not limited to both the front and back waist portions 5a and 5b, and it is sufficient if at least one of them is provided. A first flap 6 and a second flap 7 are formed at the waist portions 5a and 5b, respectively.
Reliable leakage prevention and improved fit are achieved. That is, the top sheet 2 and the leak-proof sheet 3 forming the first flap 6 are extended outwardly from the longitudinal ends of the absorber 4 to the waist portions 5a and 5b with substantially the same dimensions. I have. The top sheet 2 is provided at the end (part) 4 a of the absorber 4.
, The absorbent body 4 is covered up to this point, but is separated from the absorbent body 4 at the end 4a.

A second flap 7 is interposed between the top sheet 2 and the leakage prevention sheet 3 constituting the first flap 6. The second flap 7 is disposed so as to overlap the top sheet 2 and the leak-proof sheet 3 of the first flap 6, and is further superposed on the end surface of the end 4a of the absorber. As described above, the second flap 7 is overlapped on the absorber end 4a, thereby preventing leakage of excrement oozing out of the absorber from the absorber end.

Although the second flap 7 is a hydrophobic sheet, it is preferable that the second flap 7 is impermeable to liquid and has moisture permeability.
That is, as the hydrophobic sheet of the second flap, it is preferable to use a sheet in which a moisture-permeable sheet and a hydrophobic nonwoven fabric are combined. By having moisture permeability in this way, "irritation"
This is because it is possible to prevent rash and “rash”. As such a sheet material, a liquid impermeable and water vapor permeable film stretched by adding a filler to a thermoplastic resin or a nonwoven fabric made of a hydrophobic fiber made of a heat fusible resin such as polyethylene, polypropylene, nylon, or polyester is used. Yes, these may be used alone or in combination.

The hydrophobic sheet forming the second flap 7 may be a single sheet or the above-mentioned topsheet 2
It may be composed of two sheets in correspondence with the sheet 3 and the leak-proof sheet 3. However, from the viewpoint of simplifying the structure, one sheet is folded and the top sheet 2 and the leak-proof sheet 3 are formed.
It is preferable to arrange between them. However, in order to prevent leakage of excrement oozing out of the absorber from the absorber end,
It is preferable that the hydrophobic sheet forming the second flap 7 has a width wider than the absorber width and completely covers the absorber end.

In the case of one sheet, the second flap 7 is arranged by folding the hydrophobic sheet in half, and the space between the top sheet 2 and the leak-proof sheet 3 is provided outside the end 4 a of the absorber 4. It is open in a V-shape so as to open one side. That is,
The opening 8 is formed in a substantially V-shaped cross section, as shown in FIG. Further, the second flaps 7 are arranged over both ends in the width direction of the diaper at the waist portions 5a and 5b.
c and 5c are fixedly joined. Therefore, the waist 5
a, 5b are closed at both ends 5c, 5c in the width direction,
An opening 8 is formed outside the disposable diaper.

The first flap 6 at the end of the V-shaped opening
And the second flap 7, that is, at the peripheral portion of the opening 8,
An elastic member 9 that expands and contracts in the peripheral direction of the waist is provided, and expands and contracts in the peripheral direction of the waist 5a and 5b.
Gathers are formed around the openings 8.
By arranging the elastic members 9 in this manner, the fit of the waist portions 5a and 5b can be improved, and the prevention of excrement leakage can be improved.

The elastic member 9 has an elasticity of 200% or more and is continuous with the topsheet 2 and the second flap 7 as a band or a plurality of threads made of natural rubber, synthetic rubber, foamed polyurethane or the like. Is joined to. In the case of manufacturing the disposable diaper according to the present embodiment, when forming the flap in the conventional manufacturing process of the disposable diaper, the top sheet 2 and the leak-proof sheet 3 at the both ends in the longitudinal direction of the absorber 4 can be freely joined. In a state, the second folded flap is disposed between the top sheet 2 of the first flap and the leak-proof sheet 3 and the second flap 7 and the top sheet 2,
At least one of the second flap 7 and the leak-proof sheet 3 and at least one of the second flap 7 and the upper surface of the absorber 4 can be easily manufactured by being joined via an elastic member 9 therebetween.

At the time of wearing the disposable diaper according to the present embodiment, as shown in FIG. 1, the back waist portion 5a is attached to the wearer's back waist and the abdomen side from the deployed state of the disposable diaper shown in FIG. The waist 5b is worn so as to be applied to the waist of the wearer's abdomen, and the fastening tape 10 at the back waist is fastened to the target tape (not shown) of the abdomen.

During wearing, excrement is absorbed by the absorber 4, but thereafter gradually exudes or migrates to the end 4a of the absorber 4. Thus, the absorber 4
The excrement at the end of the absorber 4 is separated from the end 4a of the absorber 4 by the second flap 7 covering the end of the absorber 4 between the top sheet 2 and the leak-proof sheet 3 in the first flap 6. Bleeding is prevented, and leakage of excrement from the waist portions 5a, 5b is prevented.

Further, the elasticity of the elastic member 9 disposed between the first flap and the second flap improves the fit of the waist portion, thereby making it possible to provide a comfortable wearing feeling and prevent leakage. The present invention is not limited to the embodiments described above, and can be variously modified without departing from the gist of the present invention.

For example, as shown in FIG. 5, the first flap 6 and the second flap may be free ends without joining the ends 5c of the waist portions 5a and 5b in the circumferential direction of the waist. Further, the second flap may be arranged such that ends of the two hydrophobic sheets are bonded to each other in a V-shape.

[0029]

According to the disposable diaper of the present invention, it is possible to provide a disposable diaper capable of improving the fitting property at the waist and reliably preventing the waist from leaking.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the top sheet showing a state in which the disposable diaper shown in FIG. 1 is developed.

FIG. 3 is a perspective view showing a waist portion of the disposable diaper shown in FIG.

FIG. 4 is a perspective view showing a waist cut away.

FIG. 5 is a cutaway perspective view showing a waist portion of a disposable diaper according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Leak-proof sheet 4 Absorber 5a, 5b Waist 6 First flap 7 Second flap 8 Opening 9 Elastic member

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) A61F 13/49 A61F 5/44

Claims (6)

(57) [Claims] 1. A liquid-permeable top sheet, a liquid-impermeable leak-proof sheet, and an absorber located between the two sheets, and a waist portion which is located on the waist of the wearer when worn. In the disposable diaper provided, the waist portion is provided with a first flap formed by extending the top sheet and the leak-proof sheet outward from at least one end in the longitudinal direction of the absorber, A second sheet made of a hydrophobic sheet is provided between the top sheet forming the first flap and the leakage prevention sheet so as to open outward between the top sheet and the leakage prevention sheet.
The flaps are arranged in a V-shape, and a part of the second flap is overlapped on an end surface of the absorber, and the first flap and the second flap at the V-shaped opening end are provided.
A disposable diaper characterized in that an elastic member that expands and contracts in a peripheral direction of the waist portion is provided between the diaper and the flap. 2. The disposable diaper according to claim 1, wherein the hydrophobic sheet of the second flap is a liquid-impermeable and moisture-permeable sheet. 3. The disposable diaper according to claim 1, wherein the hydrophobic sheet of the second flap is made of a hydrophobic nonwoven fabric. 4. The disposable diaper according to claim 1, wherein the hydrophobic sheet of the second flap is a composite sheet of a moisture permeable sheet and a hydrophobic nonwoven fabric. 5. The disposable diaper according to claim 1, wherein the second flap is arranged by folding one hydrophobic sheet in half. 6. The disposable diaper according to claim 1, wherein the second flap is disposed by adhering ends of the two hydrophobic sheets to each other in a V-shape.