JP2003290282A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper having a function of preventing the leakage of urine and absorbing sweat in the crotch. <P>SOLUTION: The inner surface side of a solid gather part 5 is formed from a water-repellant sheet 5b, and the outer surface side thereof is formed from a hydrophilic sheet 5a. Even when a quantity of urine is over the solid gather part 5, the urine is not immediately leaked since it is absorbed by the hydrophilic sheet 5a. Besides, since the inner surface of an outer edge 6 wrapping the crotch is the hydrophilic sheet 5a, the sweat of the crotch is absorbed to suppress the occurrence of rash or heat rash. <P>COPYRIGHT: (C)2004,JPO

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, incontinent persons, etc., and more particularly to a disposable diaper provided with a function of preventing urine leakage and absorbing sweat from the crotch part.

[0002]

2. Description of the Related Art Disposable diapers are roughly classified into flat type and pants type. As shown in FIG. 1, the flat-type disposable diaper has an absorbent body interposed between an inner liquid-permeable sheet 23 and an outer liquid-impermeable sheet 22, and a front waist portion 11 through a crotch portion 21. It is formed vertically to the rear waist portion 12, and elastic stretchable members such as rubber thread are stretched and joined to the seat, and tape-shaped elastic stretchable members are joined to the front waist portion 11 and the rear waist portion 12 to the gathered sheet. By doing so, a curved shape that fits the body is obtained, and the three-dimensional gathers 5 and 5 and the gathered outer edges 6 are provided on both sides of the central portion in which the absorber is installed.
6 is formed.

Fastening tapes 15 and 15 are provided on the rear side flaps 13 and 13 extending outward from both sides of the rear waist portion 12, respectively, and the front waist portion 11 is a fastening surface of the fastening tape. A front target tape 16 is provided, and the rear waist portion 1 is provided on the back side of the wearer when worn.
2. The front waist portion 11 is applied to the abdominal side, and the fastening tape 15 is fastened to the front target tape 16. The fastening of the fastening tape 15 forms a leg opening,
The crotch portion of the wearer is wrapped with the outer edge portion 6, and the three-dimensional gather portion 5 is located inside thereof to prevent urine leakage.

The pants-type disposable diaper has a pair of left and right by joining the rear side flaps 13 and 13 at both ends of the rear waist portion 12 of the flat type disposable diaper and the front side flaps 14 and 14 at both ends of the front waist portion 11 in advance. A leg opening and a waist opening are formed, and the basic structure is the same as the flat type.

The solid gather portion 5 and the outer edge portion 6 shown in FIG.
As shown in FIG. 6, the three-dimensional gather portion 35 and the outer edge portion 36 according to the related art corresponding to the above-mentioned state, when the outer sheet 22 and the inner sheet 23 are joined by wrapping the absorber 24, the water repellent sheet is extended. It is formed by joining together with the elastic expansion and contraction member 7. The water repellent sheet forming the three-dimensional gather portion 35 also extends to the inner surface side of the outer edge portion 36. Since the three-dimensional gather portion 5 is a water repellent sheet, urine is prevented from leaking outside.

[0006]

In the above conventional structure, when the three-dimensional gather portion 35 is formed of a water repellent sheet, even if there is an amount of urine that exceeds the absorption capacity or absorption speed of the absorber 24, it overflows. Urine is stored inside the three-dimensional gather portion 35, but once it exceeds the three-dimensional gather portion 35, the urine runs on the water-repellent sheet and immediately the outer edge portion 36.
There was a problem that it leaked out from. If the three-dimensional gather portion 35 is formed of a hydrophilic sheet, it has an effect of absorbing urine, but since it is not waterproof, it will pass through the three-dimensional gather portion 35 and leak to the outside, thus preventing leakage of urine. It cannot act as 35.

Further, since the outer edge portion 36 wraps around the wearer's crotch portion, if the inner surface portion that comes into contact with the skin is a water repellent sheet, the sweat of the crotch portion is not absorbed, and the rash and sweat rash associated with the sweat are absorbed. There was a problem that created the factor that caused it.

The present invention was devised in view of the above problems, and an object of the present invention is to provide a disposable diaper provided with a structure for effectively preventing urine leakage and absorbing the bruise of the crotch portion.

[0009]

In order to achieve the above object, the first invention of the present application is such that an absorber is interposed in the central portion between a liquid-permeable inner sheet and a liquid-impermeable outer sheet, and In a disposable diaper in which a three-dimensional gather portion is formed on both outer sides of the central portion, the three-dimensional gather portion has an outer surface having hydrophilicity and an inner surface having water repellency. It is characterized by being formed, and the three-dimensional gather part has a role of a bank to prevent leakage of urine because the inner surface has water repellency, and when the amount of urine is large Even if it crosses the three-dimensional gather part, since the outer surface has hydrophilicity, urine that has crossed the three-dimensional gather part is absorbed by the hydrophilic surface, and immediately it does not leak to the outside. I won't.

In the three-dimensional gather portion having the above-mentioned function, the inner surface is formed of a water repellent sheet, or the three-dimensional gather portion is formed of a hydrophilic sheet, and the inner surface of the three-dimensional gather portion is water repellent. Or by forming the three-dimensional gather portion with a water repellent sheet and coating the outer surface thereof with a hydrophilic agent.

In the second invention of the present application, an absorbent body is interposed in the central portion between the liquid-permeable inner sheet and the liquid-impermeable outer sheet, and the three-dimensional gather portions are provided on both outer sides of the central portion. In the disposable diaper having outer edge portions formed on both outer sides, the three-dimensional gather portion has outer and inner surfaces formed of hydrophilic sheets, and the space between both sides of the hydrophilic sheet. In the three-dimensional gather portion, the water-repellent sheet interposed between both surfaces of the hydrophilic sheet serves as a bank to prevent leakage of urine. If the volume of urine is large, it may cross over the three-dimensional gathers, but since there is a hydrophilic sheet on the outer side as well, the urine that has crossed over the three-dimensional gathers is absorbed by the hydrophilic sheet and immediately goes outside. Does not leak.

In each of the above constructions, by forming the surface of the outer edge portion in contact with the body with a sheet having hydrophilicity, the sweat of the crotch portion, which easily sweats, can be absorbed by the hydrophilic sheet. It is possible to prevent the occurrence of rashes and sweats.

By forming the surface of the outer edge portion contacting the body and the outer surface of the three-dimensional gather portion with a sheet having the same hydrophilicity, the sheet forming the three-dimensional gather portion is extended outward. By doing so, the surface of the outer edge portion that comes into contact with the body can be formed, and the manufacturing can be facilitated and the cost can be reduced.

The hydrophilic sheet preferably has a water retention amount of 0.5 to 3.5 g / 100 cm ² , and the material itself has the above water retention amount, or 1 to 40 g / g. A sheet containing a material having water retention property can be applied. 1-40g / g
The water retention property of means that 1 to 40 g of artificial urine is absorbed per 1 g of a material (for example, cotton).

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The embodiments described below are examples of embodying the present invention and do not limit the technical scope of the present invention.

FIG. 1 shows the overall structure of a disposable diaper 1, which is configured in a so-called flat type. The disposable diaper 1 is formed vertically symmetrically from the front waist portion 11 on the abdominal side of the wearer to the rear waist portion 12 on the back side through the crotch portion 21. In the front waist portion 11 and the rear waist portion 12, a tape-shaped elastic elastic member (here, foamed polyurethane) is embedded between both sheets, which are gathered when an outer sheet 22 and an inner sheet 23, which will be described later, are joined, The three-dimensional gathers 5 and the outer edge portions 6 are formed in a gathered state by joining thread-like elastic stretchable members (thread rubber here) to the left and right sides in an extended state, and a shape that fits a curved body as a whole. Is formed in.

Further, fastening tapes 15 and 15 having adhesive surfaces are provided on the rear side flaps 13 and 13 extending from the rear waist portion 12 side to the left and right, and the easily peelable surface is provided on the front waist portion 11. Front target tape 16
Is provided. The fastening tape 15 is formed in a tape shape extending from a base portion 15a provided with an easily peelable surface attached to the rear side flap 13 to a tab portion 15b provided with an adhesive surface. The adhesive surface of the tab portion 15a is attached to the easily peelable surface of the base portion 15a, and when the tab portion 15b is used, as shown by a broken line in FIG.
It can be peeled off from a. This disposable diaper 1
When using the front waist portion 12 with the rear waist portion 12 on the wearer's back side through the crotch and the front waist portion 11 on the abdominal side, the rear side flaps 13 and 13 on the rear waist portion 12 side and the front side on the front waist portion 11 side. Since the flaps 14 and 14 overlap each other on the body side, the tab portion 15b of the fastening tape 15 is peeled off from the base portion 15a to remove the front target tape 16 from the front target tape 16.
When it is fastened with an adhesive surface, it can be worn by the wearer in the form of pants. Since the marking line 16a is displayed on the front target tape 16, the fixing position of the fastening tape 15 is determined according to the wearer's physique and body shape by using the marking line 16a as a guide to obtain the most fitted wearing state. You can

FIG. 2 shows a configuration of the three-dimensional gather portion 5 and the outer edge portion 6 according to the first embodiment as a cross section taken along line XX of FIG. The three-dimensional gather portion 5 joins the hydrophilic sheet 5a arranged on the outer side and the water repellent sheet 5b arranged on the inner side, and at the same time as the top portion of the three-dimensional gather portion 5, the elastic stretchable member (thread rubber). ) 7 is extended and joined. The hydrophilic sheet 5a forming the three-dimensional gathered portion 5 extends to the outer edge portion 6, and is joined together with the elastic sheet 7 in the stretched state sandwiched between the outer sheet 22 enclosing the absorber 24 and the inner sheet 23 in the central portion. It

The hydrophilic sheet 5a is the inner sheet 23.
The same material can be applied, and woven cloth, non-woven cloth, porous film and the like are preferable, and water retention capacity is 0.5 to 3.5 g / 1.
Those having 00 cm ² are preferred. The hydrophilic sheet is made of a material having a water retention capacity of 1 to 40 g / g in an amount of 3 to 5
Those contained in 0% sheet can be applied.
If the content of the water-retaining material exceeds 50%, problems such as the material being exposed from the surface of the sheet and adhering to the skin tend to occur. Therefore, the content is preferably 50% or less.

A specific example of the hydrophilic sheet is a hydrophilic air-through non-woven fabric manufactured by Rengo Co., Ltd., and has a basis weight of 40 g / m ^2.
Can be used. As the water-retaining material, natural fibers such as cotton, pulp, and polymer water-absorbing agent can be used. For example, a hydrophilic air-through nonwoven fabric containing about 10% cotton can be used.

The water retention is measured by the sheet test piece 10c.
After measuring the weight of m × 10 cm and immersing it in artificial urine for 5 seconds, the test piece is placed on kitchen paper and left for 5 minutes, and the increment from the original weight is taken as the water retention amount.

The water-repellent sheet 5b can be made of the same material as the outer sheet 22, is a film obtained by adding a filler to a thermoplastic resin and stretched, and is preferably a moisture-permeable sheet that allows vapor to pass therethrough, and is a disposable diaper. It is possible to suppress stuffiness when the device 1 is attached. It is preferable that the absorbent body 24 is composed mainly of defibrated pulp and a high-molecular water-absorbing polymer together. The high-molecular water-absorbing polymer is preferably in the form of particles having a property of absorbing and retaining a liquid and gelling, such as starch-acrylic acid (salt) graft copolymer, saponification product of starch-acrylonitrile copolymer,
A cross-linked product of sodium carboxymethyl cellulose or the like can be applied.

When the disposable diaper 1 having the above-mentioned structure is attached to a wearer such as an infant and urine is excreted, the inner sheet 23
When the amount of urine is large or the number of times is large and the amount of absorption and the absorption rate of the absorber 24 are exceeded, the urine is accumulated on the inner surface sheet 23. Since the inner surface of the gather portion 5 is the water-repellent sheet 5b, the collected urine does not flow out. If the amount of urine further increases, urine leakage may occur beyond the solid gather portion 5, but the outer surface of the solid gather portion 5 has a hydrophilic sheet 5.
Since it is a, urine that has passed through the three-dimensional gather portion 5 is absorbed by the hydrophilic sheet 5a and does not immediately flow out from the outer edge portion 6.

Further, since the hydrophilic sheet 5a forming the three-dimensional gather portion 5 is extended on the inner surface side of the outer edge portion 6, the hydrophilic sheet 5a is formed on the outer edge portion 6 located at the crotch of the wearer. The state of touching is obtained. The crotch part of the human body is a part that easily sweats and does not easily wick sweat, and infants are prone to rashes and eczema that accompany sweat, but because the hydrophilic sheet 5a touches the skin of the crotch part Absorbed,
It is possible to prevent the occurrence of rashes and sweats.

FIG. 3 shows the construction of the three-dimensional gather portion 8 and the outer edge portion 6 according to the second embodiment. The other construction of the disposable diaper 1 is the same as that shown in FIG.

In FIG. 3, the three-dimensional gather 8 is formed of a hydrophilic sheet 8a whose inner surface is coated with a water repellent 8b. The hydrophilic sheet 8a covers the inner surface side of the outer edge portion 6. A silicone oil, paraffin wax, or the like can be applied as the water repellent 8b. By coating them on the inner surface of the hydrophilic sheet 8a, the surface of the hydrophilic sheet 8a on the female side can be coated. It can give water repellency.

According to the structure of the second embodiment described above, when urine collects on the inner side of the solid gather portion 8, the water repellent 8b is coated on the inner surface of the solid gather portion 8. As a result, urine does not pass through the three-dimensional gather portion 8, so that urine leakage can be prevented. Even if the amount of urine that exceeds the three-dimensional gather portion 8 is absorbed by the hydrophilic sheet 8a, urine does not immediately leak.

Since the inner surface of the outer edge portion 6, that is, the surface that contacts the crotch portion is extended and covered with the hydrophilic sheet 8a of the three-dimensional gather portion 8, it is possible to absorb the sweat from the crotch portion. It suppresses the occurrence of rash and sweats associated with.

FIG. 4 shows the construction of the three-dimensional gather portion 9 and the outer edge portion 6 according to the third embodiment. The other construction of the disposable diaper 1 is the same as that shown in FIG.

In FIG. 4, the three-dimensional gather portion 9 is formed of a water repellent sheet 9b whose outer surface is coated with a hydrophilic agent 9a, and the water repellent sheet 9b has an outer edge portion 6.
The inner surface side of. As the hydrophilic agent 9a, a hydrophilic compound such as an alkyl phosphate ester can be applied. By coating the hydrophilic compound on the outer side of the water repellent sheet 9b, the outer side of the water repellent sheet 9b can be coated. The surface can be rendered hydrophilic.

According to the configuration of the third embodiment described above, when urine collects on the inner side of the three-dimensional gather portion 8, since the inner side of the three-dimensional gather portion 8 is the water-repellent sheet 9b, the urine is collected. A coating of a hydrophilic agent 9a applied to the outer surface of the water-repellent sheet 9b even when the urine is prevented from leaking through the three-dimensional gathered portion 9 and the urine amount exceeds the three-dimensional gathered portion 8. Since urine is absorbed by the surface, urine does not immediately leak.

Further, a water-repellent sheet 9b having a three-dimensional gather portion 8 is extended on the inner surface side of the outer edge portion 6, and the inner surface touching the crotch portion is the surface of the water-repellent sheet 9b coated with the hydrophilic agent 9a. Therefore, the sweat from the crotch part can be absorbed, and the generation of rash and sweat rash associated with sweat can be suppressed.

FIG. 5 shows the construction of the three-dimensional gather portion 10 and the outer edge portion 6 according to the fourth embodiment. The other construction of the disposable diaper 1 is the same as that shown in FIG.

In FIG. 5, the three-dimensional gather portion 10 is formed in such a manner that the water repellent sheet 10b is sandwiched between the hydrophilic sheets 10a. The hydrophilic sheet 10a extending from the inner surface side of the outer edge portion 6 to the three-dimensional gather portion 10 wraps the elastic stretchable member 7 on the top of the three-dimensional gather portion 10, and is folded back with the water-repellent sheet 10b sandwiched inside. When the inner side sheet 23 and the outer side sheet 22 are joined by embedding and fixing the elastic expansion / contraction member 7 made of three rubber threads on one side, they are joined at the same time.

According to the configuration of the fourth embodiment described above, when urine is accumulated on the inner side of the three-dimensional gather portion 10, the water-repellent sheet 10b is sandwiched between the hydrophilic sheets 10a of the three-dimensional gather portion 10. Therefore, leakage of urine is prevented, and even if there is an amount of urine that exceeds the three-dimensional gather portion 10, the hydrophilic sheet 10a of the three-dimensional gather 10 absorbs urine, so that urine does not immediately leak.

Further, since the hydrophilic sheet 10b having the three-dimensional gathered portion 8 is extended on the inner surface side of the outer edge portion 6, the hydrophilic sheet 10a comes into contact with the crotch portion, and the sweat from the crotch portion is reached. Can be absorbed, and the occurrence of rash and sweat rash associated with sweat can be suppressed.

The configuration of the embodiment described above has been applied to a flat type disposable diaper, but as described above, the front side flaps 14, 14 and the rear side flaps 13, 13 are preliminarily provided on both sides. By joining them together, it can be formed into a pants-type disposable diaper, and in this pants-type disposable diaper, the three-dimensional gather portion and the outer edge portion can be similarly configured.

[0038]

As described above, according to the present invention, the three-dimensional gather portion has water repellency to prevent urine from leaking out, and at the same time, has three-dimensional hydrophilicity to absorb urine beyond the three-dimensional gather portion. Therefore, even if the amount of urine exceeds the three-dimensional gather part, urine does not leak immediately. Further, since the inner surface side of the outer edge portion that comes into contact with the crotch portion of the wearer is hydrophilic, sweat of the crotch is absorbed by the outer edge portion, and it is possible to suppress the occurrence of rash and sweat rash associated with sweat.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a disposable diaper.

FIG. 2 is a cross-sectional view showing a configuration of a three-dimensional gather portion according to the first embodiment.

FIG. 3 is a cross-sectional view showing a configuration of a three-dimensional gather portion according to a second embodiment.

FIG. 4 is a cross-sectional view showing a configuration of a three-dimensional gather portion according to a third embodiment.

FIG. 5 is a cross-sectional view showing a configuration of a three-dimensional gather portion according to a fourth embodiment.

FIG. 6 is a cross-sectional view showing a configuration of a three-dimensional gather portion according to a conventional technique.

[Explanation of symbols]

1-4 disposable diapers 5, 8, 9, 10 3D gather part 5a, 8a, 10a hydrophilic sheet 6 outer edge 8b Water repellent 9a hydrophilic agent 9b, 10b Water repellent sheet 11 Front waist 12 Rear waist 22 Outer sheet 23 Inner sheet 24 Absorber

Claims (9)

[Claims] 1. A disposable diaper in which an absorbent body is interposed in the center between a liquid-permeable inner sheet and a liquid-impermeable outer sheet, and three-dimensional gathers are formed on both outer sides of the center. 2. The disposable diaper according to claim 3, wherein the three-dimensional gather portion is formed so that the outer surface has hydrophilicity and the inner surface has water repellency. 2. The disposable diaper according to claim 1, wherein the inner surface of the three-dimensional gather portion is formed of a water repellent sheet. 3. The disposable diaper according to claim 1, wherein the three-dimensional gather portion is formed of a hydrophilic sheet, and an inner surface thereof is coated with a water repellent. 4. The disposable diaper according to claim 1, wherein the three-dimensional gather portion is formed of a water-repellent sheet, and the outer surface thereof is coated with a hydrophilic agent. 5. An absorbent body is interposed in a central portion between a liquid-permeable inner sheet and a liquid-impermeable outer sheet, and a three-dimensional gather portion is provided on both outer sides of the central portion and both outer sides thereof. In the disposable diaper in which the outer edge portion is formed, in the three-dimensional gather portion, the outer side surface and the inner side surface are formed by a hydrophilic sheet, and a water repellent sheet is provided between the hydrophilic sheets on both sides. A disposable diaper characterized by being interposed. 6. The disposable diaper according to claim 1, wherein a surface of the outer edge portion in contact with the crotch portion is formed of a hydrophilic sheet. 7. The surface of the outer edge portion in contact with the crotch portion and the outer surface of the three-dimensional gather are formed of sheets having the same hydrophilicity. The disposable diaper described. 8. The hydrophilic sheet has a water retention amount of 0.5.
3. It has about 3.5 g / 100 cm ^2.
The disposable diaper according to any one of to 7. 9. The hydrophilic sheet is 1 to 40 g /
The disposable diaper according to any one of claims 1 to 8, which contains 3 to 50% of a material having a water retention capacity of 3 g.