JPH11216163A - Pants type diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a side flapping part from becoming stuffy and to provide a comfortable touch for a wearer by making an inner sheet which is composed of sheets made from non-woven fabric contain hydrophilic fibers of a certain % by weight. SOLUTION: The absorptive main body 16 of the throwaway diaper consists of a top sheet 10 that is permeable, a back sheet 11 that is impermeable and an absorber 9 which is arranged between the two sheets. An outer covering 12 consists of a sheet 13 of outer layer that is made from non-woven fabric and a sheet 14 of inner layer that is made from non-woven fabric which is layered on the outer sheet 13. Between the outer sheet 13 that is around the opening for leg and the sheet of inner layer, elastic part 4 for the opening for leg is arranged. As the sheet 14 of inner layer should be permeable so as to absorb sweats of an user, it is made from non-woven fabric that contains 3-60% of hydrophilic fibers. The outer sheet 13 is made from gas permeable and water impermeable non-woven fabric in order to prevent itself from being steamed and to stop a leakage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper which is formed in a pants-type in advance.

[0002]

2. Description of the Related Art Conventionally, as a disposable diaper, for example, in a side flap of a flat type diaper as disclosed in Japanese Patent Laid-Open Publication No. Sho 57-77304, portions corresponding to left and right side abdominal parts when worn are joined in advance. A so-called pants-type diaper that is fixed and provided with an opening around the waist and an opening around the leg has been proposed. In such a pants-type disposable diaper, for example,
JP-A-16920, JP-A-4-289201, JP-A-4-166150 and JP-A-4-28920
As described in No. 1, the openings around both feet,
Stretch elasticity is applied to the opening around the waist and further to both sides around the waist in order to enhance the diaper's ability to follow and fit the wearer. Such pants-type disposable diapers can be detached and worn by a wearer, and their demand is increasing even when the diapers are separated from infants or for adults such as incontinent persons.

However, since these existing diapers are entirely covered with a liquid-impermeable back sheet, they cause stuffiness and cause discomfort to the wearer. In particular, since the side flap portion corresponding to the waist of the wearer is formed by bonding a liquid-impermeable back sheet and a liquid-permeable top sheet, sweat absorbed by the wearer is not absorbed and the skin and the diaper surface are not absorbed. It is inferior to the so-called crispness, which is a good wearing feeling without accumulation of moisture between the skins. For this reason, a contrivance has been made to use a moisture-permeable film typified by porous polyethylene as a liquid-impermeable backsheet. This improves some stuffiness but has little effect. Further, as described in JP-A-3-162854, it has been proposed to provide ventilation holes in both sides of the waist, that is, in the liquid-impermeable back sheet at the side flaps. Although this is also slightly improved, its effect is small, and if the wearer sweats a lot in the area where the film is not perforated, moisture will collect between the skin and the diaper surface, Inferior feeling.

An object of the present invention is to solve the above-mentioned problems, and to provide a side flap by using a hydrophilic sheet on both sides around the waist, that is, a side flap portion formed of a breathable sheet, and a side that comes into contact with the skin. An object of the present invention is to provide a pants-type disposable diaper that prevents stuffiness of a part, keeps the humidity in a diaper comfortable for a wearer, and has a very good wearing feeling.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an absorbent body comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the two sheets. The absorbent body is joined, and comprises an exterior member which surrounds the waist from the wearer's belly to the wearer and holds the absorbent body against the wearer at the time of wearing, and opposing both sides of the front body and the rear body of the exterior member In a pants-type disposable diaper in which edges are joined to form a waist opening and a pair of leg openings, and a stretchable elastic member is arranged along the opening, the exterior member is formed from a nonwoven sheet. An outer layer sheet, and an inner layer sheet made of a nonwoven sheet laminated on the outer layer sheet, wherein the inner layer sheet contains 3 to 6 hydrophilic fibers.
A pants-type disposable diaper characterized by containing 0% by weight.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A pants-type disposable diaper according to the present invention comprises an outer layer sheet and an inner layer sheet which hold an absorbent main body and an outer member forming the pants is formed of a nonwoven fabric.
Further, the inner layer sheet contains hydrophilic fibers.
With such a configuration, the pants-type disposable diaper of the present invention can effectively prevent the waist-side portion, that is, the side flap portion from becoming uneven, and has an extremely good wearing feeling. It is.

The liquid-permeable topsheet used in the present invention is a liquid-permeable nonwoven fabric or woven fabric made of synthetic fibers made of polyester, polypropylene, polyethylene, other thermoplastic resin, or the like. Also, natural fibers may be used, such as a combination of synthetic fibers and natural fibers.
Can be manufactured from a wide range of materials. In any case, since the topsheet is a portion that comes into direct contact with the skin, the topsheet may be soft and comfortable, and may be liquid-permeable.

The liquid-impermeable back sheet used in the present invention may be a liquid-impermeable film such as polyethylene,
Materials made of non-woven fabric or woven fabric bonded to a liquid-impermeable film, non-woven fabric, woven fabric, etc., which have leak-proof properties, with no particular restrictions, and the moisture in the absorbent does not exude to the outside of the diaper Is fine. Further, in order to give a cloth-like appearance, it may be embossed in a pattern or may be finished with a matte finish. When a film is used, a known moisture-permeable film that allows only water vapor to pass therethrough while being liquid-impermeable may be used, which is preferable from the viewpoint of preventing stuffiness. Moreover, in order to improve the fit to the wearer, a stretchable material may be used, and a polyurethane film, a natural rubber sheet, a foam sheet, or the like can be used. A laminated material may be used.

The exterior member used in the present invention is a non-woven fabric made of synthetic fibers made of polyester, polypropylene, polyethylene, other thermoplastic resin, or the like.
Woven fabric is used. Of the exterior members, the outer layer sheet disposed outside the diaper is preferably a breathable nonwoven fabric made of water-repellent synthetic fibers. On the other hand, the inner layer sheet disposed inside needs to be a hydrophilic liquid-permeable nonwoven fabric, and thus contains 3 to 60% by weight of hydrophilic fibers. Hydrophilic fibers used in the present invention, polyester, fibers subjected to hydrophilic treatment of synthetic fibers such as polyethylene, acrylic acid polymer, starch-based water-absorbing fibers,
Natural fibers such as rayon and cotton are preferable, and natural fibers having water absorbency are particularly preferable. When the content of the hydrophilic fiber is less than 3% by weight, sweat of the wearer cannot be absorbed, moisture is accumulated between the skin and the inner layer sheet, and the feeling of dryness is poor. Conversely, if the hydrophilic fiber is contained in excess of 60% by weight, the inner sheet itself retains a large amount of water,
It does not emanate to the outside of the diaper.

The absorbent used in the present invention is formed of cotton-like pulp, a highly water-absorbing polymer, a hydrophilic sheet or the like, and is not particularly limited as long as it has water-absorbing properties. The absorbent used in the present invention 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. In addition, the absorbent in which the superabsorbent polymer is uniformly mixed may be heat-compressed 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 sheets,
Waste paper pulp sheet or mechanical pulp sheet is obtained by fibrillating with a crusher and has a fiber size of 5 mm or less.
Pulp materials are not limited to conifers, but include hardwoods, straws,
Bamboo and kenaf are also applicable. The amount of this pulp used is
Depending on the intended absorber, for example, it may vary depending on whether it is used alone, a plurality of layers are used, or another absorbent is used in combination. However, the amount is generally 50 to 400 g / m ² .

Examples of the superabsorbent polymer include starch-based, cellulose-based and synthetic polymer-based substances. 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, Saponified starch-acrylamide graft copolymer, starch-acrylonitrile-2
-Saponified acrylamide-2-methylpropanesulfonic acid graft copolymer, acrylic acid (salt) polymer, polyethylene oxide crosslinked with acrylic acid, crosslinked product of sodium carboxymethylcellulose, crosslinked polyvinyl alcohol-maleic anhydride reactant Things.

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 compounding 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 cotton-like pulp.
By weight, such amount of superabsorbent polymer material is substantially uniformly distributed in the floc. When the superabsorbent polymer material absorbs water and swells, the particles have minimal interference with each other, continuously contact and have a small permeation barrier, and permeate and absorb urine and body fluid in three-dimensional directions.

The shape of the absorber may be an hourglass, a rectangle, a T
There is no particular limitation on the character shape, etc., as long as the shape fits the 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 stretchable elastic member is disposed in an extended state at the opening around the leg, the opening around the waist, and the like, and is adhered 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.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pants-type disposable diaper according to the present invention; however, the present invention is not limited thereto. FIG. 1 is a perspective view showing a pants-type disposable diaper according to the present invention. In FIG. 1, the pants-type disposable diaper has a front body 5 and a back body 6 whose opposite side edges are adhesively closed by side seams 7 to form a waist opening 1 and a pair of leg openings 2. A stretchable elastic member is arranged along each opening. Further, a plurality of waist-elastic elastic members 8 are arranged around the waist of the front body 5 and the back body 6.

FIG. 2 is a development view showing a state in which the side seam 7 of the pants-type disposable diaper of FIG. 1 is released and deployed. In FIG. 2, the disposable diaper is made of an absorbent body 16.
And an exterior member 12 for holding the same. The absorbent body 16 is joined to a central region along the longitudinal direction of the exterior member 12, and a region of the exterior member 12 where the absorbent body 16 does not exist is a side flap portion 15. It has become. Further, a waist opening elastic member 3 is arranged in the waist opening 1 of the exterior member 12, a leg opening elastic member 4 is arranged in the leg opening 2, and furthermore, the waist periphery is provided. Is provided with a waist elastic member 8.

FIG. 3 is a sectional view showing a state in which the pants-type disposable diaper shown in FIG. 2 is cut along the line XX ′. In FIG. 3, the disposable diaper is made of an absorbent body 16.
And an exterior member 12.
Numeral 6 is composed of a liquid-permeable top sheet 10, a liquid-impermeable back sheet 11, and an absorber 9 disposed between these two sheets, and the top sheet 10 and the back sheet 11 are joined. Elastic member 1 on the side edge
7 are arranged, and a three-dimensional gather 18 is formed. Further, the exterior member 12 includes an outer layer sheet 13 made of a nonwoven fabric.
And an inner layer sheet 14 made of a nonwoven fabric laminated on the outer layer sheet 13, and the leg-opening elastic member 4 is disposed between the outer layer sheet 13 and the inner sheet 14 located at the leg-opening. Have been. Further, the inner layer sheet 14 needs to be hydrophilic in order to absorb the sweat of the wearer, and is formed of a nonwoven fabric containing 3 to 60% of a hydrophilic fiber. It is formed of a breathable water-repellent nonwoven fabric to prevent oozing.

The method of manufacturing the outer layer sheet 13 and the inner layer sheet 14 constituting the exterior member 12 includes a wet papermaking method, a card method,
The web may be formed by an air laid method, a spun bond method, or the like, and may be uniformly formed into a sheet by a hot embossing method, an adhesive coating method, a high-pressure water jet treatment method, a needle punch method, or the like, and there is no particular limitation.

The basis weight of the inner layer sheet 14 can be arbitrarily determined, but is preferably 10 to 100 g / m ² . If the basis weight is less than 10 g / m ² , the nonwoven fabric is too thin, and the glue for bonding is exuded. Conversely, if it exceeds 100 g / m ² , the obtained nonwoven fabric becomes hard, and the wearing feeling is remarkably poor.

The underpants-type disposable diaper of the present invention having the outer layer member 12 having the above-mentioned structure is particularly suitable for the inner layer sheet 14 which is hydrophilic in the side flap portion 15 because the sweat absorbed by the wearer is appropriately absorbed. There is no accumulation of moisture between the wearer and the diaper surface, and the moisture absorbed by the inner layer sheet 14 is radiated to the outside of the diaper via the outer layer sheet 13, so that the moisture absorbed and diverted by the wearer in the diaper is absorbed. It is carried out constantly and makes it possible to keep the humidity inside the diaper comfortable.

[0022]

According to the pants-type disposable diaper of the present invention, the exterior member forming the pants is formed of an inner layer sheet made of a hydrophilic non-woven fabric and an outer layer sheet made of a breathable water-repellent non-woven fabric. Can be efficiently absorbed and diffused to the outside, thereby preventing unevenness and having an excellent wearing feeling.

[0023]

[Brief description of the drawings]

FIG. 1 is a perspective view showing a pants-type disposable diaper according to the present invention.

FIG. 2 is a development view showing an extended state in which a side seam of the pants-type disposable diaper of FIG. 1 is released and deployed.

FIG. 3 is a cross-sectional view showing a state where the pants-type disposable diaper of FIG. 2 is cut along the line XX ′.

[Explanation of symbols]

 1. Opening around waist 2. Opening around leg 3. Elastic elastic member around waist 4. Elastic elastic member around leg 5. Front body 6. Rear body 7. Side seam 8. Waist elastic elastic member 9 .Absorbent body 10. Liquid permeable top sheet 11. Liquid impermeable back sheet 12. Exterior member 13. Outer layer sheet 14. Inner layer sheet 15. Side flap 16. Absorbent body 17. Elastic elastic member 18. Three-dimensional gather

Claims (1)

[Claims] 1. An absorbent body comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the two sheets, and the absorbent body is joined and worn. An exterior member that surrounds the waist from the wearer's belly and holds the absorbent body against the wearer, and joins the opposite side edges of the front body and the back body of the exterior member to form a waist area. In a pants-type disposable diaper in which an opening and a pair of leg openings are formed, and a stretchable elastic member is arranged along the opening, the exterior member includes an outer layer sheet made of a nonwoven fabric sheet,
A pants-type disposable diaper comprising an inner layer sheet made of a nonwoven fabric sheet laminated on an outer layer sheet, wherein the inner layer sheet contains 3 to 60% by weight of a hydrophilic fiber.