JP2002153508A - Throwaway diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feel of a fabric to the outside of the waist area and improve the adhesiveness of the peripheries of leg openings in a throwaway diaper. SOLUTION: The rear sheet 3 of a throwaway diaper 1 comprises a plastic film 21 covering the entire rear of the diaper 1 and a pair of nonwoven fabrics 22 and 23 joining with the outside of the film 21, covering the anterior and posterior waist areas 6 and 7 of the film 21, and anteriorly and posteriorly separating from each other in the crotch area 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a disposable diaper.

[0002]

2. Description of the Related Art Conventionally, the use of a liquid-impermeable plastic film such as a polyethylene film for a liquid-impermeable backing sheet of a disposable diaper is well known as a conventional technique.
Further, Japanese Patent Application Laid-Open No. 3-86159 discloses a technique in which a composite sheet composed of a plastic film and a nonwoven fabric bonded to the outer surface thereof is used as a back sheet.

[0003]

In the conventional diapers using a plastic film as a back sheet, a consumer often dislikes the touch peculiar to the plastic film. As taught by the above-mentioned prior art, if the outer surface of such a film is a composite sheet coated with a nonwoven fabric, the outer surface of the diaper will feel like a cloth, and the problems specific to the film will be solved. However, if the back sheet is such a composite sheet, the rigidity is higher than in the case of using only a film, and the gathers generated by contraction of the elastic members around the waist and the legs have a large pitch. If the gather pitch is large around the legs, in other words, if fine gathers are not obtained around the legs, the diaper will decrease the adhesion around the legs and contribute to body fluid leakage from around the legs .

An object of the present invention is to provide a disposable diaper that improves the touch around the front and rear torso and at the same time improves the adhesion to the leg circumference.

[0005]

In order to solve the above-mentioned problems, in the present invention, a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-absorbing core interposed between these sheets are provided. And the front waist area and the rear waist area,
A crotch region located between these two regions, wherein the front and back sheets extend from both sides of the core to form front and rear waist side edges and a crotch region side edge, and the crotch region side edge It is premised on a disposable diaper having a leg elastic elastic member at each of the parts.

The present invention is based on the premise that the back sheet is integrally joined to the liquid-permeable plastic film and the outer surfaces of the plastic films in the front and rear waist regions, and is separated from each other in the crotch region. And the entire outer surface around the front and rear waist, including the front and rear waist side edges, is covered with the nonwoven fabric. The rigidity is lower than the rigidity of a region where the top sheet extending outward from both side edges of the core and the respective portions of the back sheet in the surrounding area overlap and join.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the disposable diaper according to the present invention will be described below with reference to the accompanying drawings.

A diaper 1 shown in a partially broken plan view in FIG.
Is composed of a front sheet 2 on the skin contact side, a back sheet 3 on the non-skin contact side, and a liquid-absorbent core 4 interposed between the two sheets 2, 3. It has a region 7 and a crotch region 8 located between both regions 6 and 7. The front and back sheets 2 and 3 are joined at portions extending from the four circumferences of the core 4, and front and rear waist edges 10 and 11, front and rear waist side edges 12 and 13, and crotch side edges 14. And the crotch side edge 14 is curved inward to fit around the wearer's leg. Front and rear waist edges 10,1
1 and the crotch region side edge portion 14, there are waist elastic members 16 and 17 and leg elastic members 18 between the front and back sheets 2 and 3 and extend to the inner surface of any of the sheets 2 and 3. Joined in a state. The tape fastener 1 is detachable from the left and right rear waist circumference side edges 13 to the front waist circumference side edge 12.
9 is extended.

For the topsheet 2, a liquid-permeable nonwoven fabric or a liquid-permeable open-hole plastic film is used.

The back sheet 3 is formed of a liquid-impermeable or gas-impermeable liquid-permeable plastic film 21 that covers the entire back surface of the diaper 1, and is substantially the same shape and size as the front waist region of the film 21. , A non-woven fabric 22 integrally joined thereto, and a non-woven fabric 23 substantially the same shape and size as the rear waist region of the film 21 and integrally joined thereto. As is clear from FIG. 1, the elastic elastic member 18 extends from the crotch region 8 to the lower edges of the front and rear waist regions 6 and 7 where the nonwoven fabrics 22 and 23 are located.

In the back sheet 3 of such a diaper 1, the front and rear waist regions 6, 7 where the wearer's or mother's hand often touches are non-woven fabrics 22, 23 on the outermost sides, so that Become. The inseam area 8 where there is little chance of touching the hand,
Since the nonwoven fabrics 22 and 23 are not provided and are constituted only by the plastic film 21, the nonwoven fabrics 22 and 23 are used here.
As a result, the rigidity of the back sheet 3 is reduced. As a result, when the elastic member 18 contracts, relatively fine gathers are formed on the crotch region side edge portion 14, and the diaper 1 has good adhesion to the leg circumference. The distance between the nonwoven fabrics 22 and 23 in the front-back direction of the diaper is 100 to 5 in the stretched diaper.
It is preferably in the range of 00 mm, with large spacing dimensions applied to adult diapers. The bonding between the nonwoven fabrics 22, 23 and the plastic film 21 can be performed by using an adhesive such as a hot-melt adhesive, or by using a heat welding technique, similarly to the bonding of the other members of the diaper 1. . The nonwoven fabrics 22 and 23 may or may not have the same size or outer shape.

[0012]

In the diaper according to the present invention, since the rigidity of the crotch region between the front and rear waist regions is lower than that of the front and rear waist regions, the back sheet of the entire diaper is formed of a composite sheet of a plastic film and a nonwoven fabric. Unlike the conventional diapers that have been configured, fine gathers are formed in the crotch region by the elastic members around the legs so that they can easily adhere to the periphery of the legs. In addition, since the composite sheet is disposed only in the front and rear waist regions that require tensile strength and appearance, the material can be saved.

[Brief description of the drawings]

FIG. 1 is a partially broken plan view of a disposable diaper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diaper 2 Top sheet 3 Back sheet 6 Front waist area 7 Rear waist area 8 Inseam area 18 Elastic elastic member 21 Film 22, 23 Nonwoven fabric

Claims (3)

[Claims] A liquid-permeable top sheet, a liquid-impervious back sheet, and a liquid-absorbent core interposed between these two sheets. A crotch region located between the regions, the front and back sheets extend from both sides of the core to form front and rear waist side edges, and a crotch region side edge, and the crotch region side edge In a disposable diaper having leg elastic elastic members around each, the back sheet is a liquid-impermeable plastic film,
The front and rear waist circumference including a pair of thermoplastic synthetic fiber nonwoven fabrics integrally joined to the outer surfaces of the plastic films in the front and rear waist areas and separated from each other in the crotch area, and including the front and rear waist side edges. The entire outer surface area is covered with the nonwoven fabric, and thus the rigidity of the crotch region side edge portion extends outward from both side edges of the core in the front and rear waist region. The diaper according to claim 1, wherein the diaper has a lower rigidity than a region where the portion overlaps and is joined. 2. The size in which the nonwoven fabric in the front and rear waist region is separated in the front and rear direction of the diaper is 100 to 500.
The diaper according to claim 1, which is in the range of mm. 3. The diaper according to claim 1, wherein the elastic elastic member extends from the crotch region to a lower edge of the front and rear waist region where the nonwoven fabric is located.