JP2001238908A - Throw-away diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throw-away diaper which allows the easy check of the existence of urination without impairing absorption performance. SOLUTION: The throw-away diaper consists of a liquid permeable top sheet, a liquid impermeable back sheet and an absorber arranged between both of these sheets and is formed by arranging tissue having wet tensile strength of <=0.5 N/m between the liquid impermeable back sheet and the absorber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper to be used as a diaper for infants or incontinent persons, and more particularly, to easily confirm that urine is discharged in a diaper without impairing absorption performance. It relates to a disposable diaper that can be used.

[0002]

2. Description of the Related Art Conventionally, in a disposable diaper, if the confirmation of excrement is delayed, the excrement comes into contact with the wearer's skin for a long time or the inside of the diaper is moist for a long time. Since there is a problem that it may cause discomfort and eventually cause skin irritation and the like, various methods for confirming the presence or absence of excrement have been proposed.

For example, diapers having a wetting function have been proposed. Japanese Utility Model Laid-Open No. 57-162304 discloses a diaper in which a powder ink microencapsulated with a hydrophilic film material is applied to the inner surface of a liquid-impermeable back sheet. Japanese Utility Model Publication No. 3-40272 discloses a diaper in which a water-insoluble resin layer which is transparent and translucent when wet with a liquid and is opaque when dried is provided on the inner surface of a liquid-impermeable back sheet. Such a disposable diaper has a high effect of informing the wearer of excretion, so that the time from excretion to diaper change can be shortened, and the wearer does not feel discomfort due to excrement for a long time. . However, depending on the state of use, ink for informing excretion may adhere to the body, causing a problem of giving the wearer discomfort.

[0004] As a liquid-impermeable back sheet,
2. Description of the Related Art A disposable diaper using a moisture-permeable film obtained by adding a filler to a thermoplastic resin and stretching the film has been proposed. Japanese Utility Model Publication No. 3-50896 discloses a diaper having excellent breathability using a breathable sheet such as a nonwoven fabric. Such a diaper prevents stuffiness inside the diaper due to sweat or urine, and gives the wearer a comfortable feeling of wearing. However, these diapers are inferior in the property of visually confirming excrement (hereinafter, referred to as visual recognition), and thus have a problem that they discomfort the wearer when excreting stool or a large amount of urine.

Further, Japanese Patent Application Laid-Open No. 10-85257 proposes a diaper using a sheet having a transparent portion as a liquid-impermeable back sheet. Such a diaper can reduce the time from excretion to diaper change because excrement and the colored absorbent due to the excrement can be seen through, and give the wearer long discomfort due to the excrement. There is no. However, there is a problem in that excrement may be seen by people other than the person changing the diaper, and there may be a problem that those who see it may feel discomfort.
Furthermore, in the case of an absorbent containing a large amount of superabsorbent polymer, urine is excreted because urine is absorbed by the superabsorbent polymer over time as compared with immediately after excretion. There was also a problem that it became difficult to understand.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional disposable diaper and makes it possible to easily visually recognize that urine is urinated without impairing the absorption performance. It is an object of the present invention to provide a disposable diaper that can be replaced at an appropriate time, does not cause discomfort to the wearer, and prevents stuffiness and leakage.

[0007]

Means for Solving the Problems The present invention for solving the problems of the above-mentioned conventional disposable diapers includes the following inventions. (1) In a disposable diaper including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between these two sheets, the liquid-impermeable back sheet and the absorbent sheet A disposable diaper, wherein thin paper is disposed between the body and the thin paper, and the wet tensile strength of the thin paper measured according to JIS P8135 is 0.5 N / m or less.

(2) The disposable diaper according to the above item (1), wherein the thin paper wraps the absorber.

(3) The disposable diaper according to the above (1) or (2), wherein the thin paper has a residual rate of wet tensile strength, measured according to JIS P8135, of 15% or less. .

(4) The disposable diaper according to any one of the above (1) to (3), wherein the thin paper has a color pattern.

(5) Any one of the above items (1) to (4), wherein the thin paper contains at least 10% of used paper.
Use diapers as described in the section.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A disposable diaper according to the present invention comprises a JIS P8135 between a liquid-impermeable back sheet and an absorber.
A thin paper having a wet tensile strength of 0.5 N / m or less measured according to the method described above is provided. The disposable diaper of the present invention having such a configuration allows the tissue paper to tear after urination, so that it is possible to easily recognize that urination has occurred through the back sheet in a state where the diaper is worn, and at an appropriate time. Can be exchanged, so that the wearer does not feel uncomfortable and can prevent stuffiness and leakage.

In general, the thin paper used for a disposable diaper is a thin paper called a tissue. In order to fix and hold the absorber, for example, as described in JP-A-61-119260, Although its wet tensile strength (width direction) has a strength of 75 to 125 g / 25.4 cm (28.9 to 48.2 N / m), the tissue paper used in the present invention is easy to contact with urine. The wet tensile strength is 0.5 N / m or less. If the wet tensile strength is larger than 0.5 N / m, the thin paper is hardly torn, which is not preferable.

The thin paper of the present invention has a residual rate of wet tensile strength of 15% or less. 15% wet tensile strength retention
In the following cases, the tissue paper keeps its strength in a dry state and does not easily break, but it easily breaks when it comes into contact with urine. It is not preferable that the residual ratio of the wet tensile strength exceeds 15%, because it is difficult to be broken when it comes into contact with urine.

[0015] The thin paper of the present invention comprises an absorber and a backsheet.
Placed between, but wrapped around the entire absorber and placed
May be. Because of this, until the urination occurs,
The movement of the tissue breaks the tissue paper and causes the fluff in the absorber.
Sufficient strength so that pulp and superabsorbent polymer do not go outside
The weight is generally 10 to 40 g / m. ^Two 
It is preferred that Also, dyes are added to tissue paper.
Recolored pulp or a part of the raw material
What mixed more than 10% of used paper such as raw paper, or picture
Can be used. Such thin
If you use leaf paper, you can pass through the back sheet to tear when urinating.
It is preferable because it is easy to confirm.

The back sheet used in the present invention is a liquid impermeable film such as polyethylene, a material in which a nonwoven fabric or a woven fabric is bonded to the liquid impermeable film,
Further, it is made of a nonwoven fabric or a woven fabric having a leakproof property, and is not particularly limited as long as the moisture in the absorbent does not seep out to the outside of the diaper. Further, in order to give a cloth-like appearance, it may be embossed in a pattern or may be further matte-finished. In the case of using a film, a known moisture-permeable film that is permeable to liquid but can transmit only water vapor may be used, which is preferable because it prevents stuffiness. In addition, a stretchable material may be used to fit the wearer, and a polyurethane film, a natural rubber sheet, a foam sheet, or the like can be used. good.

The absorbent used in the present invention is formed of cotton-like pulp, a superabsorbent polymer, a hydrophilic sheet or the like, and is not particularly limited as long as it has a water absorbing property. The absorber used in the present invention,
It is made from known absorbent materials commonly used in conventional disposable diapers and other absorbent articles. That is, it is formed from a single-layer or multi-layer mat made of absorbent fibers such as cotton-like pulp and rayon, wrapped by a hydrophilic sheet, and a highly water-absorbing polymer is uniformly mixed in each mat. Alternatively, they are arranged in layers between the mats. Further, the absorbent in which the superabsorbent polymer material is uniformly mixed may be subjected to thermocompression bonding after mixing 3 to 60% by weight of the heat-fusible substance with respect to the cotton-like pulp. Only the water-absorbing polymer substance may be wrapped by the hydrophilic sheet.

As the cotton-like pulp, chemical pulp sheet,
A used paper pulp sheet or a mechanical pulp sheet obtained by defibrating with a crusher has a fiber length of 5 mm or less. Pulp raw materials are not limited to conifers,
Straw, bamboo and kenaf also apply. The amount of the pulp used varies depending on the intended absorber, for example, depending on whether the pulp is used alone, a plurality of layers are used, or another absorbent is used in combination. In general, the amount of pulp is 50 to 400 g / m ^2. It is.

As the superabsorbent polymer, starch-based, cellulose-based and synthetic polymer-based substances are used. That is, a starch-acrylic acid (salt) graft polymer, a saponified starch-ethyl acrylate graft copolymer, a saponified starch-methyl methacrylate graft copolymer, a saponified starch-acrylonitrile graft copolymer, Examples include a saponified starch-acrylamide graft copolymer, an acrylic acid (salt) polymer, polyethylene oxide crosslinked with acrylic acid, a crosslinked product of sodium carboxymethylcellulose, and a crosslinked product of a polyvinyl alcohol-maleic anhydride reactant.

Of these, those which absorb urine, bodily fluids and water at least 20 times their own weight, and those of the sodium polyacrylate type are most suitable in terms of absorption performance. The distribution amount of the superabsorbent polymer is 10 to 500 parts by weight, preferably 15 to 300 parts by weight, based on 100 parts by weight of the dried floc.
Parts by weight, and when such amount of the superabsorbent polymer is substantially uniformly distributed in the cotton-like pulp, when the superabsorbent polymer swells due to water absorption, the particles interfere with each other. Is minimized, and there is little chance of continuous contact to form a permeation barrier, so that urine and bodily fluid can be permeated and absorbed well in three-dimensional directions.

The shape of the absorber is not particularly limited, such as an hourglass shape, a rectangular shape, and a T-shape, and may be any shape that fits inseam. In general, in order to improve the feeling of wearing, it is particularly preferable to have a shape in which the crotch portion is narrowed, such as an hourglass shape or a T shape.

The top sheet used in the present invention is a liquid-permeable nonwoven fabric or woven fabric composed of synthetic fibers made of polyester, polypropylene, polyester, other thermoplastic resin, or the like. In addition, natural fibers may be used, and the fibers can be manufactured from a wide range of materials such as a combination of synthetic fibers and natural fibers. In any case, since the top sheet is a part that comes into direct contact with the skin, the top sheet may be soft and comfortable, and may be breathable. Since the central region of the top sheet is disposed on the absorber, it is preferably made of hydrophilic fibers so that the liquid can be transmitted quickly, and both end regions in the vertical direction are absorbed by the absorber. It is preferable that the liquid is water repellent so that the liquid does not seep outside. Further, the top sheet does not need to be constituted by a single sheet, and may be constituted by a plurality of sheets such as a center top sheet and a side top sheet. When the top sheet is composed of a plurality of sheets, each sheet may be made of a different material, or may be made of the same material.

The stretchable elastic member is arranged in an extended state around the opening around the leg, around the waist, and the like, and is bonded and fixed with a hot melt adhesive. As the elastic member, a urethane film, urethane thread, urethane foam, thread rubber or the like is used.

In the present invention, the backsheet and the tissue paper are preferably joined. The joining method is not particularly limited, as long as the back sheet and the thin paper can be joined without easily detaching before urination, and a known adhesive, a sealing method, or the like can be used. As an adhesive,
For example, an adhesive containing a styrene-butadiene-styrene copolymer, a styrene-isoprene-styrene copolymer, an acrylate ester, a vinyl acetate-ethylene-vinyl acetate copolymer as a main component, and the like can be used. By joining the absorbers in this manner, tearing of the thin paper is more easily distinguished from the back sheet side, which is preferable.

[0025]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a disposable diaper according to the present invention. FIG. 1 is a partially cutaway plan view of a disposable diaper of the present invention. As shown in FIG. 1, a disposable diaper 1 according to the present invention includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorber 4 disposed between these two sheets. . Fastener tapes 7 are attached to both lateral edges of the absorbent body 4 on the back side, and are used when worn. The disposable diaper of the present invention is not particularly limited to the tape-type diaper, but may be a pants-type diaper in which opposing side edges of the front body and the back body are adhesively closed.

FIG. 2 is a cross-sectional view of the disposable diaper of the present invention shown in FIG. 1 taken along the line XX '. In FIG. 2, the absorber 4 is wrapped in an upper thin paper 5 on the top sheet 2 side and a lower thin paper 6 on the back sheet 3 side. Urine that has passed through the top sheet 2 and the upper thin paper 5 reaches the absorber and diffuses, and thus reaches the lower thin paper 6. In the present invention, the wet tensile strength of the lower thin paper 6 measured according to JIS P8135 is 0.5 N / m or less, and if it is less than this value, the thin paper is easily broken by urine, and the back is kept in a worn state. Excretion is easily visible through the sheet.

FIG. 3 is a cross-sectional view of a configuration different from FIG. 2 in which the disposable diaper of the present invention shown in FIG. 1 is cut along the line XX ′, and the absorber 4 is made of one thin paper 6. Wrapped.

FIG. 4 is a perspective view showing a state after wearing urine in the wearing state of the disposable diaper according to the present invention. The tear 9 of the lower-layer thin paper 6 can be visually recognized through the back sheet 3 on a white background.

According to the disposable diaper of the present invention, it is possible to easily recognize through the back sheet that urination occurs in the diaper without impairing the absorption performance. It does not give a pleasant feeling and can prevent stuffiness and leakage.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of a disposable diaper of the present invention.

FIG. 2 is a cross-sectional view of the disposable diaper shown in FIG. 1 taken along line XX ′.

3 is a cross-sectional view of the disposable diaper shown in FIG. 1 taken along a line XX ′ and having a different configuration from FIG. 2;

FIG. 4 is a perspective view of the disposable diaper after urination of the present invention in a worn state.

[Explanation of symbols]

 1. Diaper for use 2. Top sheet 3. Back sheet 4. Absorber 5. Upper thin paper 6. Lower thin paper 7. Fastening tape 8. Leg elastic body 9. Torn thin tissue

Claims (5)

[Claims] 1. A disposable diaper comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the two sheets. Between the absorber,
A disposable diaper on which thin paper is disposed, wherein the wet tensile strength of the thin paper measured according to JIS P8135 is 0.5 N / m or less. 2. The disposable diaper according to claim 1, wherein the thin paper wraps the entire absorbent body. 3. The disposable diaper according to claim 1, wherein the residual tensile strength of the thin paper measured according to JIS P8135 is 15% or less. 4. The disposable diaper according to claim 1, wherein the thin paper has a color pattern. 5. The disposable diaper according to claim 1, wherein the thin paper contains at least 10% of waste paper.