JPH0810285A - Disposable diaper - Google Patents

Abstract

PURPOSE:To obtain a disposable diaper which has an excellent property to prevent leakage in the joint part of the front surface sheet and rear surface sheet in the girth part of a wearing person and an excellent fit to the girth part of the wearing person and property to prevent slipping by laying a waist barrier arranged with elastic stretching members at the back side girth part. CONSTITUTION:This disposable diaper has the liquid permeable front surface sheet 2, the liquid impermeable rear surface sheet 3, an absorber 4 interposed therebetween and the waist barrier 20. An waist aperture and leg apertures are formed by joining the belly side girth part existing on the user's belly side and the back side girth part 5' existing on the back side. Further, the waist barrier 20 is laid between the absorber 4 and the front surface sheet 2 from the end edge of the waist aperture in the back side girth part 5'. The waist barrier 20 is bent to the front surface sheet 2 side on the absorber 4 to a double structure and the elastic stretching members 21 are so arranged as to be clamped by the waist barrier 20. One of the elastic stretching members 21 is arranged on the absorber 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disposable diapers, more specifically, diapers for infants, training pants, and adult diapers.
Alternatively, it relates to a disposable diaper used for incontinence.

[0002]

2. Description of the Related Art A general flat type disposable diaper has a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorbent material interposed between these sheets 2 and 3. The waist opening 6 and the pair of leg openings 7 are provided by joining the abdominal waistline portion 5 that includes the body 4 and is located on the abdominal side of the wearer when worn, and the back side waistline portion 5 ′ that is located on the back side. , 7 are formed (see FIG. 1 showing an embodiment of the present invention).

However, the conventional disposable diaper has a problem that when the wearer is sleeping, excrement leaks from the joint between the topsheet 2 and the backsheet 3 in the waistline of the wearer. Therefore, in order to solve the above problems, various disposable diapers have been proposed in which the leakage prevention property of excrement from the joint between the top sheet and the back sheet is improved.

For example, Japanese Unexamined Patent Publication (Kokai) No. 58-54002 proposes a disposable diaper in which waist barriers are arranged on the waist and waist sides of the diaper. In the disposable diaper, the above waist barrier is used. Since it does not have elasticity, the fit of the waist part is poor, and there is a gap in the waist part, which often causes leakage for urine that has been excreted well and for stool that does not easily soak into the absorbent body. In addition, there was a problem that the diaper would shift during wearing due to poor fit. In addition, JP-A-6
1-275402 discloses a disposable diaper in which elastic waist barriers are arranged on the ventral side and the back waistline of the diaper, but in the disposable diaper, the waist barrier functions as a waist gather. Since it is a single unit that combines, it is very difficult to mount (unsatisfactory mountability) because unnecessary parts shrink to improve fitability, and because thermoplastic resin is used, the elastic force has a manufacturing limit. However, there is a problem in that an effective strength against a slippage of the diaper cannot be obtained, and further in terms of processing, the processing is extremely difficult (workability is poor).

Therefore, an object of the present invention is to provide a disposable article which is excellent in leakage prevention at the joint between the top sheet and the back sheet in the waist area of the wearer, and which is excellent in fit and displacement prevention to the waist area of the wearer. To provide diapers.

[0006]

According to the present invention, a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorber 4 and a waist barrier 20 interposed between these two sheets 2 and 3.
The waist opening 6 and the pair of leg openings 7, which are provided by joining the abdominal waistline portion 5 located on the abdominal side of the wearer and the back side waistline portion 5 ′ located on the back side, when In the disposable diaper which forms 7, the above-mentioned waist barrier 2
No. 0 is laid in the back waistline portion 5 ′ from the edge portion of the waist opening 6 to between the absorber 4 and the surface sheet 2, and the waist barrier 2
0 has a double structure in which it is bent toward the surface sheet 2 side on the absorbent body 4, and an elastic stretchable member 21 is arranged so as to be sandwiched by the waist barrier 20. The above object is achieved by providing a disposable diaper characterized in that at least one of 21 is arranged on the absorbent body 4.

[0007]

In the disposable diaper of the present invention, since the waist barrier having the elastic stretchable member is laid on the back waistline portion, the waist diaper fits around the waistline portion of the wearer and is less likely to be displaced. There is no leakage from the joint portion of the top sheet and the back sheet in the section, and even if the wearer excretes a large amount during use, the excrement leakage is excellent.

[0008]

Embodiments of the disposable diaper of the present invention will be described below with reference to the drawings. 1 is a perspective view showing a first embodiment of the disposable diaper of the present invention, FIG. 2 is a partially cutaway enlarged development view showing a waist portion after the disposable diaper shown in FIG. 1, and FIG. 2 is an enlarged cross-sectional view taken along the line II ′ of FIG.

As shown in FIGS. 1 and 2, the disposable diaper 1 of this embodiment has a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorbent body interposed between these sheets 2 and 3. 4 and a waist barrier 20, and the waist opening 6 and the pair of waist openings 6 and a pair of waist abdomen 5'located on the back side of the wearer and a back waistline 5'located on the wearer's abdomen when worn. The leg openings 7, 7 are formed. And the said waist barrier 20 is the said back side waist part 5 ',
The waist barrier 20 is laid from the edge portion of the waist opening 6 between the absorber 4 and the topsheet 2, and the waist barrier 20 is bent toward the topsheet 2 on the absorber 4. And has a double structure,
An elastic stretchable member 21 is arranged so as to be sandwiched by the waist barrier 20, and at least one of the elastic stretchable members 21 is arranged on the absorber 4.

More specifically, as shown in FIG. 1 and FIG.
In the disposable diaper 1 of the present embodiment, the absorber 4 is formed in a rectangular shape, and the topsheet 2 and the backsheet 3 are curved in an hourglass shape in which the crotch portions are twisted. Then, as shown in FIG. 2, in the leg portion 7, between the topsheet 2 and the backsheet 3, and in the front and rear waist portions 9 and 9 ′, the topsheet 2 and the waist. Elastic members 8 are respectively stretched between the barriers 20 and the barriers 20. As a result, as shown in FIG. 1, the elastic members 8 are contracted in a free state, so that the waist opening 6 and the leg openings 7 of the diaper can be obtained. The waist gathers and leg gathers are formed around the periphery of the ′ so that the waist gathers and the leg gathers of the wearer can be fitted. Further, tape fasteners 10 for joining the abdominal waistline portion 5 and the backside waistline portion 5 ′ are provided on both left and right edges of the backside waistline portion 5 ′.

The surface sheet 2 is preferably a liquid permeable sheet that allows excrement to permeate into the absorbent body and has a feeling close to that of underwear. Examples of such a liquid permeable sheet include woven fabric and non-woven fabric. , And porous films are preferred. In addition, a method of applying a hydrophobic compound such as a silicone oil or paraffin wax to the peripheral edge of the surface sheet 2 or a method of previously applying a hydrophilic compound such as an alkyl phosphate ester to the entire surface and washing the peripheral edge with warm water is performed. By applying a water repellent treatment, it is possible to prevent leakage due to bleeding of urine or the like at the peripheral edge.

The back sheet 3 is preferably a vapor-permeable, liquid-impermeable sheet that is permeable to vapor and is stretched by adding a filler to a thermoplastic resin, and preferably has a feel similar to that of underwear. As such a liquid impermeable sheet, for example, a composite material of a film and a non-woven fabric is preferably cited. Further, in this embodiment, the back sheet 3 has the fastening tape 1 on the entire surface thereof.
It is made of a material such as 0, which can be adhered in a peelable manner, for example, moisture-permeable polypropylene.

The absorbent body 4 is preferably a combination of a high-molecular water-absorbing polymer mainly composed of defibrated pulp,
Further, it is preferable to heat-treat a mixture of thermoplastic resin, cellulose fiber, and high-molecular water-absorbing polymer. The high-molecular water-absorbing polymer may be present in any of the upper layer, the middle layer, and the lower layer of the absorbent body 4, or may be a mixture with pulp. In addition, the water-absorbing polymer has a weight of 20
It is preferable to use particles in the form of particles having a gelling property, which has a retention performance capable of absorbing and retaining twice or more times the amount of liquid.
Preferable examples include acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked sodium carboxymethyl cellulose, acrylic acid (salt) polymers.

As the elastic member 8, thread rubber,
Preferred examples thereof include flat rubber, film type rubber, and film-like polyurethane foam, and those having a stress at 50% elongation of 40 to 100 g are preferable.

The material forming the fastening tape 10, that is, the tape material, the adhesive material, etc., is not limited, and a material forming a normal fastening tape can be used.

The characteristic parts of the disposable diaper 1 of this embodiment will be described. In the disposable diaper 1 of this embodiment, as shown in FIGS. 2 and 3, the waist barrier 20 has a rectangular shape. Yes, in the back waistline portion 5 ′, from the end edge portion of the diaper so that the end edge portion of the waist opening portion 6 and the side edge of the waist barrier 20 overlap with each other substantially at the center in the width direction. It is laid between the absorber 4 and the topsheet 2.
Further, the waist barrier 20 is folded on the absorber 4 toward the surface sheet 2 to have a double structure. Further, three elastic stretchable members 21 are arranged along the width direction of the disposable diaper 1 and at a predetermined interval in the longitudinal direction of the disposable diaper 1 so as to be sandwiched by the bent waist barrier 20. Of the elastic elastic members 21, the second elastic elastic member 21b and the third elastic elastic member 21c are arranged on the absorber 4. Further, as shown in FIGS. 1 and 2, the elastic stretchable members 21a and 21b are arranged such that the left and right ends thereof are overlapped with the edge portions of the portion of the tape fastener 10 fixed to the diaper. The elastic expansion / contraction member 21a and the elastic expansion / contraction member 21b are interlocked with the movement of the tape fastener 10.

The material for forming the waist barrier 20 may be a mixture of a polyolefin compound and an inorganic compound, and the thickness thereof is preferably 20 to 150 μm, more preferably 30 to 50 μm. The thickness is 20
When it is less than μm, the strength of the waist barrier 20 is weak,
The workability at the time of manufacturing the diaper is poor, and when it exceeds 150 μm, the diaper becomes stiff and the usability is deteriorated.

As the material for forming the elastic expansion / contraction member 21, the same material as the elastic member 8 can be used, but in this embodiment, rubber thread is used. Since the rubber thread is a polyurethane type, it is particularly preferable among the above-mentioned materials. The expansion ratio of the elastic stretchable member 21 is preferably 30 to 150%, and is 50 to 150%.
% Is more preferable, and 50 to 100% is the most preferable. When the expansion rate is less than 30%, the fit property is deteriorated, and when the expansion ratio is more than 150%, the absorbent article performance is deteriorated because the entire diaper shrinks in the width direction. Therefore, it is preferably within the above range.

Further, as shown in FIG.
The width N of the ya 20 is 30 to 100 mm, and further 45 to 65 m.
m is preferred, and the weight of the diaper is
Side edge of the waist barrier 20 and the first elastic expansion and contraction
Distance n from member 21a₁Is 20 to 45 mm
Preferably, the first elastic elastic member 21a and the second elastic elastic member 21a
Distance n from the contracting member 21b₂Is 2 to 15 mm
Preferably, the second elastic elastic member 21b and the third elastic elastic member 21b
Distance n from the contracting member 21c₃Is 2 to 15 mm
Preferably, the third elastic expansion / contraction member 21c and the waste cloth are further provided.
Distance n between the barrier 20 and the side edge of the absorber 4 side_FourIs
It is preferably 0 to 10 mm. In addition, the elastic expansion and contraction
Length W of member 21₁Is the width W of the diaper₀Ratio with W₁/
W ₀= 70 to 100% is preferable.

In order to effectively develop the leakage prevention effect of the waist barrier 20, the edge of the absorbent body 4 on the back waistline portion 5'side and the waist barrier 2 are formed.
The distance n ₅ (see FIG. 3) from the side edge on the absorber 4 side of 0 is 5c.
It is preferably m or less, more preferably 1 to 3 cm.

In order to dispose the elastic stretchable member 21 on the waist barrier 20, the elastic stretchable member 21 is entirely stretched on the waist barrier 20 in the same manner as the elastic member 8 is stretched on the diaper. The waist barrier 20 can be laid in a predetermined position of the diaper by a generally known method.

In the disposable diaper 1 of the present embodiment constructed as described above, the waist barrier 20 having the three elastic members 21 arranged as described above is laid on the rear waist portion 5 '. Therefore, the following effects are achieved. Elastic elastic member 2 arranged on the waist barrier 20
According to 1, the elasticity of the waist part is improved, so that the fit property of the waist part is improved, and the leak prevention effect is improved even for urine that has been urinated well and the stool that does not easily soak into the absorbent body. . In addition, the slip-off preventing effect is very high, and the improvement in the function improves the fitting property and further improves the leak preventing effect. Further, since the elastic expansion / contraction member 21 is arranged in the waist barrier 20 having a double structure, the absorbent body does not collapse or break and is excellent in workability.

The disposable diaper of the present invention is shown in FIGS.
The structure shown in FIG. 6 can also be used. Here, FIG. 4 to FIG. 6 are partially exploded enlarged development views showing the rear waist portion in the second to fourth embodiments of the disposable diaper of the present invention (FIG. 2).
(Corresponding figure). Further, the explanation given in the above-mentioned first embodiment is appropriately applied to the points other than the points described below.

In the disposable diaper of the second embodiment shown in FIG. 4, all of the two elastic elastic members 21 are provided on the absorbent body 4, and the elastic elastic member 21 is placed on the absorbent body 4. The above-mentioned waist barrier 20 only in the part to be excluded [the left and right side edges of the waist barrier 20 (area) (hatched part in FIG. 4)]
It is arranged by being adhesively fixed to. In the disposable diaper of the third embodiment shown in FIG. 5, the three elastic elastic members 21 are the portions excluding the central portion in the width direction of the diaper and the left and right end portions of the waist barrier 20 [the left and right corners of the absorbent body 4]. Only the side (and the area in the vicinity thereof) (the hatched portion in FIG. 5)] is bonded and fixed to the waist barrier 20. In the disposable diaper of the fourth embodiment shown in FIG. 6, the three elastic expansion / contraction members 21 are arranged in the width direction of the diaper only in the central portion [the absorbent body 4 and the area in the vicinity thereof (hatched portion in FIG. 6)]. It is arranged by being adhesively fixed to the waist barrier 20. still,
The present invention is not limited to the above-described embodiment, and for example, the waist barrier 20 may be provided in the abdominal waistline portion 5 with the same structure, and the elastic expansion / contraction member 21 may be provided. The number and the like can be changed as appropriate.

[0025]

EFFECT OF THE INVENTION The disposable diaper of the present invention is excellent in the leakage prevention property at the joint between the top sheet and the back sheet in the waist region of the wearer, and in the fit property and the slippage preventive property to the waist region of the wearer. It is a thing.

[Brief description of drawings]

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

FIG. 2 is a partially cutaway enlarged development view showing a waist portion after the disposable diaper shown in FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line II ′ of FIG.

FIG. 4 is a partially cutaway enlarged development view (corresponding to FIG. 2) showing a rear waist portion in the second embodiment of the disposable diaper of the present invention.

FIG. 5 is a partially cutaway enlarged development view (corresponding to FIG. 2) showing a rear waist portion in a third embodiment of the disposable diaper of the present invention.

FIG. 6 is a partially cutaway enlarged development view (corresponding to FIG. 2) showing a rear waist portion in a fourth embodiment of the disposable diaper of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 5 Abdominal girth part 5'Back girth part 6 Waist opening 7 Leg part 7'Leg opening 8 Elastic member 10 Fastening tape 20 Waist barrier 21 Elastic elastic member

Claims (3)

[Claims] 1. A liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorber 4 and a waist barrier 20 interposed between these sheets 2 and 3, and the belly of the wearer when worn. In the disposable diaper, the waist opening 6 and the pair of leg openings 7, 7 are formed by joining the abdominal waistline portion 5 located on the side and the back waistline portion 5 ′ located on the back side. In the back waistline portion 5 ′, 20 is arranged from the end edge portion of the waist opening portion 6 to the absorber 4
The waist barrier 20 is laid between the top sheet 2 and the top sheet 2, and the waist barrier 20 is double-folded on the absorber 4 toward the top sheet 2 side. An elastic elastic member 21 is disposed so as to be sandwiched by, and at least one of the elastic elastic members 21 is disposed on the absorbent body 4, which is a disposable diaper. 2. The disposable diaper according to claim 1, wherein each of the elastic elastic members 21 is arranged along the width direction of the diaper and at a predetermined interval in the longitudinal direction of the diaper. 3. The disposable diaper according to claim 1, wherein the elastic stretchable member 21 is rubber thread.