JPH0788133A - Disposable diaper - Google Patents

Abstract

PURPOSE:To constitute a disposable diaper so that a reverse side sheet is not broken, and also, an adhesive part is not peeled off at the time of attaching and peeling off the diaper and in the course of using it by constituting the diaper so that the reverse side has specific horizontal direction tension breaking strength, and the adhesive part has specific adhesive strength to the reverse side sheet. CONSTITUTION:This disposable diaper is provided with a liquid permeable surface sheet 2, a liquid impermeable reverse side sheet 3 and an absorbent 4 interposed between them. Also, in both left and right side edge parts 8 in waist parts 5, 5' before and behind the disposable diaper 1 for abutting on the waist of a wearer at the time of wearing, lug pieces 10, 20 are formed, respectively, and in the lug piece 10 of both the left and right side edge parts of the waist part 5', an adhesive part 11 and a peeling part corresponding to the adhesive part 11 are formed respectively. Also, horizontal direction tension breaking strength of the reverse side sheet 3 is >=300g/10mm, and adhesive strength to the reverse side sheet 3 of the adhesive part 11 is within a range of 80-400g/10mm.

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 does not cause wearer's pain due to a diaper fixing tape.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
The disposable diaper has a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body interposed between these sheets, and a fastening tape for fixing the diaper during use. When the tape is not in use, the tape is bent so that the adhesive portion is adhered to the adhesive peeling portion provided on the surface sheet side of the diaper.

When the diaper is used, the adhesive portion of the fastening tape is attached to the peeling portion provided on the back sheet of the diaper so that the wearer can wear the diaper. There is a problem in that the bent portion of the fastening tape causes damage to the skin of the infant or the like who is the wearer, causing pain to the wearer.

Therefore, as a disposable diaper having the above-mentioned problem due to the bent portion, for example, without attaching the fastening tape, the adhesive pieces are attached to the ear pieces provided on both sides of the front and rear waist portions of the diaper. Disposable diapers and the like for fixing the diaper via the part have been proposed.

However, the above-mentioned conventionally proposed disposable diaper is not practically sufficient, and the back sheet is torn when the adhesive part is attached or removed or the diaper is in use, or the adhesive layer is used during diaper use. There is a problem that the parts come off.

Therefore, an object of the present invention is to prevent the diaper fixing tape from causing pain to the wearer, and to prevent the back sheet from being peeled off when the diaper fixing adhesive part is attached or removed or during use of the diaper. Without breaking
Further, it is to provide a disposable diaper in which the adhesive portion does not peel off during use of the diaper.

[0007]

As a result of various studies on a disposable diaper which can solve the above-mentioned problems, the present inventors have provided an ear piece having an adhesive portion for fixing a diaper on the waist portion of the diaper, and the back surface thereof. It has been found that a disposable diaper in which the sheet has a specific transverse tensile strength at break and the adhesive portion has a specific adhesive force to the back sheet can achieve the above object.

The present invention has been made on the basis of the above findings, and has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between these sheets, and has front and rear waists. In the disposable diaper in which the left and right side edges of the section are provided with the respective ear pieces, on the surface sheet side of the left and right ear pieces of the rear waist portion, the adhesive portions and the peeling portions corresponding to the adhesive portions, respectively, Each of the adhesive parts is provided outside, the transverse tensile breaking strength of the back sheet is 300 g / 10 mm or more, and the adhesive force of the adhesive part to the back sheet is 80.
The present invention provides a disposable diaper characterized by being in the range of 400 g / 10 mm.

[0009]

In the disposable diaper of the present invention, after the adhesive portions of the ear pieces provided on the left and right side edges of the front and rear waist portions of the disposable diaper are peeled from the peeling portion, the adhesive portions are applied to the back sheet. By attaching it, it can be used by being attached to the user. And, the disposable diaper of the present invention does not have a fastening tape and therefore does not damage the skin of the user due to the bent portion of the fastening tape, and the back sheet has a specific transverse tensile rupture strength. Since the adhesive portion has a specific adhesive force with respect to the back sheet, the back sheet is not ruptured when the diaper is attached and removed and during use, and the adhesive portion may be removed during use. Absent.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is a perspective view showing an embodiment of the disposable diaper of the present invention, and FIG. 2 is an exploded view of the disposable diaper shown in FIG.

As shown in FIG. 1, the disposable diaper 1 of the present invention has a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorber 4 interposed between these sheets. Further, ear pieces 10 and 20 are provided respectively on the left and right side edge portions 8 of the waist portions 5 and 5 ′ before and after the disposable diaper that come into contact with the wearer's waist during wearing, and the waist portion 5 ′ after the above is provided. Left and right edges of the ears 1
0, each of which is provided with an adhesive portion 11 and a peeling portion 12 corresponding to the adhesive portion 11, and the transverse tensile breaking strength of the back sheet 3 is 600 g / 10 mm.
The adhesive force of 1 for the back sheet 3 is 150 g / 10
mm.

More specifically, in the disposable diaper 1 of this embodiment, as shown in FIGS. 1 and 2, the absorbent body 4 is curved and formed in the shape of an hourglass in which the crotch region is entangled. The crotch region of the seat 3 is also curved in accordance with the shape of the absorber 4 as described above, and the absorber 4 is sandwiched and fixed by the topsheet 2 and the backsheet 3. Further, the waist portions 5, 5 ′ and the leg portions 6 on the front and rear sides of the peripheral portion of the absorbent body 4 allow the wearer to fit the waist portions 5, 5 ′ and the leg portions 6 when the diaper is worn. An elastic elastic member 7 is provided by being fixed by the top sheet 2 and the back sheet 3.

The surface sheet 2 is preferably a liquid-permeable sheet that allows excrement to permeate into the absorbent body and has a feeling similar to 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.

Further, the absorbent body 4 is preferably one in which a high molecular weight water-absorbing polymer mainly composed of defibrated pulp is used in combination, and a heat-treated mixture of thermoplastic resin, cellulose fiber and high-molecular weight water-absorbing polymer is preferably used. preferable. 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. Further, the high molecular weight water-absorbing polymer is preferably in the form of particles having a retaining property capable of absorbing and retaining a liquid 20 times or more its own weight and having a gelling property,
Examples of such high-molecular water-absorbing polymer include starch-acrylic acid (salt) graft copolymer, starch-
Preferable examples include saponified products of acrylonitrile copolymer, crosslinked products of sodium carboxymethyl cellulose, and acrylic acid (salt) polymers.

Further, the elastic elastic member 7 is preferably a rubber thread, a flat rubber, a film type rubber, a film-like polyurethane foam, or the like. The stress at 50% elongation is 50 to 100 g, and the elastic property. A non-woven fabric type having air permeability is preferable.

Thus, the disposable diaper 1 of this embodiment is
Ear pieces 10 and 20 are provided on the left and right side edge portions 8 of the waist portions 5 and 5 ′ before and after the disposable diaper that come into contact with the waist of the wearer at the time of wearing, and the left and right sides of the waist portion 5 ′ after the above. Adhesive portions 11 and peeling portions 12 corresponding to the adhesive portions 11 are provided on the selvages 10 of both side edge portions 8, respectively, and the transverse tensile breaking strength of the back sheet 3 is 600 g / 10 mm. The adhesive force of the part 11 to the back sheet 3 is 150 g / 10 mm.

Both left and right edge portions 8 of the front waist portion 5 described above.
Each ear piece 20 is formed by extending the top sheet 2 and the back sheet 3 respectively.

The ear pieces 10 on the left and right side edge portions 8 of the rear waist portion 5'are formed by laminating the same members as the topsheet 2 and the backsheet 3 together. Further, it is provided via the stretchable portion 13 formed of a stretchable member provided along the side edge portion 8. Since the ear piece 10 is provided via the stretchable portion, the ear piece 10 has excellent fit when the diaper is used, and the diaper is easily put on when the diaper is worn.

As the elastic member, urethane foam,
An elastic film, an elastic nonwoven fabric, etc. can be used preferably. Further, the ear pieces 10 on the left and right side edge portions 8 of the rear waist portion 5 ′ are formed to be larger than the ear pieces 20 on the left and right side edge portions 8 of the front waist portion 5 described above. This makes it easier to fix the diaper when using it.

When the diaper is not used, the adhesive section 11 is brought into contact with the peeling section 12 to protect the adhesive section 11, and when the diaper is used, the adhesive section 11 is applied to the back sheet. By attaching it, the wearer can wear the diaper and use it. In the present invention, the transverse tensile strength at break of the back sheet is 300 g /
10 mm or more, preferably 500 to 1200 g /
It is 10 mm. The transverse tensile strength at break is 300 g /
When it is less than 10 mm, the back sheet may be broken during use of the diaper or when the adhesive part is attached and removed.

As the back sheet 3 having the transverse tensile strength at break, a stretched, vapor-permeable, liquid-impermeable sheet made of a thermoplastic resin with a filler added thereto is preferable, and it is close to underwear. Those having a feeling are preferable. As such a liquid impermeable sheet, for example, a film made of polyethylene, polypropylene, polyester, vinyl, a rubber-based film, a blend thereof, or the like, a composite material of the film and a non-woven fabric, or the like is preferably given. In addition, the liquid-impermeable sheet is a method of improving strength, for example, a method of modifying the resin itself (a method of blending a resin having rigidity or viscosity or a method of using a high molecular weight base polymer), a sheet The film may be stretched (uniaxially or biaxially) to orient the molecules to improve its strength and then used.

Further, the back sheet 3 used in this embodiment is treated with a release agent on the entire surface thereof. Further, the adhesive section is formed by applying an adhesive to a tape material.

The adhesive force of the adhesive portion to the back sheet is in the range of 80 to 400 g / 10 mm, preferably 120 to 200 g / 10 mm. If the adhesive strength is less than 80 g / 10 mm, the adhesive part may peel off during use of the diaper, and 400 g /
When it is more than 10 mm, the back sheet may be broken or the adhesive section may not be peeled off when peeling the adhesive section from the back sheet. As the above-mentioned pressure-sensitive adhesive and release agent, generally known ones can be appropriately selected and used so as to satisfy the above-mentioned range of pressure-sensitive adhesive strength.

The transverse tensile strength at break and the adhesive strength can be determined by carrying out the tests shown below and.

The above-mentioned transverse tensile strength test 1) Apparatus Universal tensile tester (manufactured by Orientec) 2) Sample As shown in FIG. 3, the front part 31 of the back sheet 3 of the diaper,
2 points each from the central portion 32 and the rear portion 33, 6 points in total [10 mm x (test area A 100 mm + preliminary area B2
5 mm × 2)]. 3) Measuring method 1. Measurement conditions Temperature 20 ° C, Humidity 65% RH 2. Tensile conditions Distance between chucks 100 mm Tensile speed 300 mm / min Chart speed 300 mm / min 3. Tensile Rupture Strength Test Method The breaking strength of each sampled sample in the horizontal direction was determined by the above apparatus, and the obtained value was defined as the tensile fracture strength.

Adhesive strength test 1) Apparatus Tensilon universal testing machine (manufactured by Orientec Co., Ltd.), 25 mm width 1 kg rubber roller, acrylic plate 2) Measurement conditions Tensile speed 300 mm / min Chuck distance 110 mm 3) Sample pretreatment 20 ℃, humidity 65% RH 4) Testing method Double-sided tape (MD30mm) was attached to an acrylic plate (30mm × 125mm × 3mm), and the back sheet was attached to this so that the surface on which the adhesive part of the ear piece was attached was the front surface. Attach it, and use this as the adherend, stick only the adhesive part of the ear piece,
A 25 mm wide 1 kg rubber roller was reciprocated once for pressure bonding, and a 180 ° peeling test was performed under the above conditions to obtain an average load, and the adhesive strength of the adhesive portion against the back sheet (g / 10 m
m). The same measurement was carried out for five samples (back sheet and adhesive part), and the average is shown.

Next, another embodiment of the present invention will be described with reference to FIG. The points that are not particularly described are the same as in the above-described embodiment. Here, FIG. 4 is a development view showing another embodiment of the disposable diaper of the present invention.

In the disposable diaper 1A shown in FIG. 4, the left and right ear pieces 10A of the rear waist portion 5A 'are made of elastic members. That is, the ear edge 10A has a stretchable member formed into the shape shown in FIG.
A and the peeling part 12A are attached and formed.

The present invention is not limited to the above-mentioned embodiment, and for example, an example in which the elastic member is provided only in a part of the ear piece has been described, but the entire ear piece is elastic. It may be formed of a member, and the example in which the entire back sheet is subjected to the peeling treatment has been described. However, the back sheet may be one obtained by subjecting the back sheet to a peeling treatment, or one in which a peeling tape is laid. You may use.

[0031]

EFFECT OF THE INVENTION The disposable diaper of the present invention does not cause a pain to the wearer due to the tape for fixing the diaper,
Further, the back sheet is not torn when the adhesive part for fixing the diaper is attached or removed, or during use of the diaper, and further, the adhesive part is not removed during use of the diaper.

[Brief description of drawings]

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

FIG. 2 is a development view of the disposable diaper shown in FIG.

FIG. 3 is a schematic plan view showing sampling points of a sample in a transverse tensile strength test.

FIG. 4 is a development view showing another embodiment of the disposable diaper of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Topsheet 3 Backsheet 4 Absorber 5 Front waist part 5'After waist part 6 Leg part 7 Elastic elastic member 8 Side edge part 10 Ear piece 11 Adhesive part 12 Exfoliating part 13 Elastic part 20 Ear piece

Claims (4)

[Claims] 1. A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between these sheets, and ear pieces are provided at both left and right edges of the front and rear waist portions. In the disposable diaper that is, on the surface sheet side of the left and right ear pieces of the waist after the above,
Adhesive parts and peeling parts corresponding to the adhesive parts are respectively provided with the adhesive parts positioned outside, and the transverse tensile breaking strength of the back sheet is 300 g / 10.
mm or more, and the adhesive strength of the adhesive portion to the back sheet is 80 to 4
Disposable diaper characterized by being in the range of 00 g / 10 mm. 2. The left and right ear pieces of the waist portion after the above,
The disposable diaper according to claim 1, wherein each of the disposable diapers is provided via a stretchable portion. 3. The left and right ear pieces of the waist portion after the above,
Each of them is made of a stretchable material.
The disposable diaper described. 4. The left and right ear pieces of the waist portion after the above,
The disposable diaper according to any one of claims 1 to 3, wherein the disposable diaper is larger than the ear pieces on both left and right edges of the front waist portion.