JPS62223301A - Disposable diaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disposable diaper characterized by the arrangement of elastic bands around the waist and around the legs, particularly around the former. As long as it is included in the concept of a so-called diaper, it can be suitably used regardless of whether it is used by infants, the elderly/sick people, or incontinent people.

[Conventional technology]

2. Description of the Related Art Disposable diapers have conventionally been known that are equipped with an elastic band for elastically bringing the waistband or leg area of the diaper into close contact with the wearer's body area. It is also known to use rubber, plastic foam, plastic that develops elasticity through heat treatment, etc. as the material for the elastic band. In particular, as a diaper equipped with an elastic band around the waist, there is a diaper in which air passages are provided between the front and back sheets by intermittently adhering the band in the length direction.
It is disclosed in each publication of No. 44601 and No. 60-17101.

[Problem that the invention seeks to solve]

Conventional diapers, including those disclosed in the above-mentioned publications, have the following characteristics due to the characteristics of the elastic bands themselves:
No technical idea for measuring breathability between the inside and outside of the diaper is disclosed.

In the diapers disclosed in the above-mentioned publications, in order to provide the ventilation passages, elastic bands must be intermittently bonded to the front and back sheets of the diaper to form gears of a required size, otherwise the desired effect will not be achieved. However, the larger the unevenness of gears, the worse the appearance and feeling of wearing, and the greater the risk of excrement leaking from there.

[Means for solving problems]

By using a specific elastic band, the present invention can measure the breathability between the inside and outside of the diaper, and even when the band is intermittently bonded between the front and back sheets of the diaper, It is an object of the present invention to provide a disposable diaper in which the bonding interval can be set narrow enough to prevent excrement from leaking, thereby solving the above-mentioned problems.

The gist of the means of the present invention for achieving the above object is as follows: a water-permeable top sheet, a water-impermeable back sheet, an absorbent core interposed between the front and back sheets, and a longitudinally opposing Between at least one of the front and back sheets, a waist flap formed by the front and back sheet portions extending from the edge and a side flap formed by the front and back sheet portions extending from the laterally opposite edges of the core. and an elastic band interposed therein, the elastic band being made of a breathable foam sheet, the outer edge of which is exposed between the outer edges of the front and back sheets.

In a preferred embodiment of the invention, the elastic band has a thickness of 1 to 3 m and a width of at least 5 m.
, the number of cells (bubbles) is 20 to 70/1nch, and
Open-cell urethane foam sheets are used.

〔Example〕

Further, the present invention will be explained based on illustrated embodiments.
It is as follows.

As shown in FIG. 1, an absorbent core 3 is relatively immovably interposed between a water-permeable top sheet 1 and a water-impermeable back sheet 2 via an adhesive (not shown). . The top sheet 1 is made of nonwoven fabric, porous plastic film, etc.
Further, the back sheet 2 is made of a plastic film, a laminate sheet of the plastic film and a nonwoven fabric, and the like.

The core 3 is made of a cotton-like bulb mixed with superabsorbent polymer powder. Front and back sheets 1,
The outer peripheral portion of the core 3 extends from the outer peripheral edge of the core 3 to form a waist flap 4 and side flaps 5.

An elastic band 6 is interposed between the front and back sheets 1 and 2 of the waist flap 4 while being stretched in the length direction, that is, in the lateral direction of the diaper.

The outside 96a of the elastic band 6 is a front and back sheet of 1°2
It is exposed by being positioned so as to join with those of la and 2a.

As shown in FIG. 2, the elastic band 6 is fixed to the front and back sheets 1 and 2 using a hot melt adhesive 7a.
7b. The adhesives 7a and 7b extend linearly in the width direction of the elastic band 6, that is, in the longitudinal direction of the diaper, and are applied at required intervals in the length direction, that is, in the width direction of the diaper. The distance between the adhesives 7b that joins the back sheet 2 and the elastic band 6 is narrower than the distance between the adhesives 7a that joins the top sheet 1 and the elastic band 6.
The joint surface of the top sheet 1 and the elastic band 6 has a larger contractile force than the joint surface of the back sheet 2 and the elastic band 6, so that the waist flap 4 easily bends and comes into close contact with the wearer's body side. It is like that. In the present invention, the adhesives 7a and 7b may extend linearly in the length direction of the elastic band 6, or may be applied in a planar manner over substantially the entire band. Further, the adhesive is applied in a linear or striped manner on the joint surface between the top sheet 1 and the elastic band 6 as a means for giving a difference in the shrinkage force, and is applied on the joint surface between the back sheet 2 and the elastic band 6. may be applied in a planar manner.

The distance between the outer edge of the core 3 and the opposing inner edge of the elastic band 6 is set to 5I or more, so that the waist flap 4 where the elastic band 6 is located, especially on the front side of the diaper, It is then bent inward to make it easier to fit tightly against the wearer's abdomen.

An elastic band 8 is interposed between the front and back sheets 1 and 2 of the side flap 5 while being stretched in the longitudinal direction of the side flap 5, that is, in the longitudinal direction of the diaper. Although the outer edge of this elastic band 8 is not exposed, it may be positioned and applied like the elastic band 6 on the waist flap 4.

The material for the elastic band 6 in the waist flap 4 is a breathable foam sheet, preferably with a thickness of 1 to 3 m and a width of 5 m or more (particularly preferably 15 to 35 m).
un), the number of cells (bubbles) is 20 to 70/inch・
A urethane foam sheet with a density of 20-70 kg/rn' and open cells is used. The urethane foam sheet is used as the elastic band 8 in the side flap 5 when it is intended to provide the same functions and effects as the elastic band 6 in the waist flap 4.

Otherwise, there are no particular limitations.

Note that 9 in the figure indicates a fastening piece made of adhesive tape.

〔Effect of the invention〕

According to the diaper of the present invention having the above-mentioned configuration, a breathable foam sheet is used as an elastic band in one of the waist flap and the side flap, especially in the former, and the outer edge of the foam sheet is exposed to the outer edge of the front and back sheets. The inside and outside of the diaper are connected through the elastic band, so that stuffiness inside the diaper can be reduced or suppressed. Since air permeability is achieved by utilizing the characteristics of the material of the elastic band itself, the adhesive method and adhesive method for joining the elastic band between the front and back sheets is limited to the area between the outer edges of the front and back sheets. You can choose freely, taking into consideration things such as preventing the leakage of excrement from the body.

[Brief explanation of drawings]

The drawings show an embodiment of the diaper of the present invention, in which Fig. 1 is a partially cutaway developed plan view, Fig. 2 is an enlarged sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is an assembled perspective view. . 1...Top sheet 2...Back sheet 3...
Core 4... Waist flap 5... Side flap 6... Elastic band 7a, 7b
...Adhesive S...Elastic band agent Yoshiharu Shirahama l-11 Figure 1 Figure 2

Claims (6)

[Claims] (1) Formed by a water-permeable top sheet, a water-impermeable back sheet, an absorbent core interposed between the front and back sheets, and a portion of the front and back sheets extending from longitudinally opposing edges of the core. A disposable diaper comprising: a waist flap; side flaps formed by the front and back sheet portions extending from lateral opposite edges of the core; and an elastic band interposed between at least one of the front and back sheets. The diaper is characterized in that the band is made of a breathable foam sheet, and its outer edge is exposed between the outer edges of the front and back sheets. (2) The diaper according to claim 1, wherein the foam sheet is urethane foam having open cells. (3) The diaper according to claim 1, wherein the elastic band has a thickness of 1 to 3 mm. (4) said elastic band has a width of at least 5 mm;
The diaper according to claim 1. (5) The diaper according to claim 1, wherein the elastic band is located on the waist flap. (6) The foam sheet has a cell count of 20 to 7.
The diaper according to claim 1, which has a diameter of 0/inch.