JPH11299829A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper for not damaging a wearing feeling without the need of covering an elastic extension/contraction member with two sheets. SOLUTION: This disposable diaper 1 is provided with a liquid transmissive surface sheet 2, a liquid non-transmissive back surface sheet 3 and a liquid absorptive core 4 interposed between both sheets 2 and 3 and a longitudinal direction crossed with a waist direction is constituted of a front waist area, a back waist area and a crotch area positioned between both areas. The elastic extension/contraction member 8 extended in a direction around the front and back waist areas is covered with the back surface sheet 3 for more than 1/2 of a peripheral length on a width direction cross section crossed with the longitudinal direction of the member 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 Disposable diapers of the unfoldable type and the pants type are:
A plurality of elastic elastic members are joined in a stretched state in the circumferential direction around the front and rear trunks of the back sheet, and then the stretched state is released to give elasticity around the front and rear trunks, thereby contracting the elastic elastic members. Prevent displacement during wearing by force. If the elastic elastic member is exposed from the sheet and directly touches the skin, the feel is poor and the elastic elastic member may be left on the skin. For this reason, the elastic sheet is covered by joining the top sheet to the back sheet.

[0003]

When the elastic sheet is covered with the back sheet and the top sheet, the two members are intermittently joined in the region where the elastic member is present, but the rigidity at the joint increases. , The feeling of wearing may be impaired.

[0004] An object of the present invention is to provide a disposable diaper which does not need to cover the elastic elastic member with two sheets and does not impair wearing feeling.

[0005]

In order to solve the above-mentioned problems, the present invention is based on the premise that a liquid-permeable top sheet, a liquid-impermeable back sheet, and a sheet interposed between these two sheets. The disposable diaper has a liquid-absorbent core, and has a front waist region, a rear waist region, and a crotch region located between the front waist region and the rear waist region.

[0006] Under such a premise, the feature of the present invention is that the elastically stretchable member extending in the circumferential direction of the front and rear waist region is at least １ ／ of the circumferential length in a cross section in the width direction crossing the longitudinal direction of the member. Is covered with the back sheet.

In one embodiment of the present invention, the back sheet is formed of a plastic film and a non-woven sheet bonded to an outer surface of the plastic film, and extends in a direction around the front and rear waist region. The elastic stretchable member is covered with the nonwoven fabric sheet at least half or more of a peripheral length in a cross section in a width direction crossing the longitudinal direction of the member.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A disposable diaper according to the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view of the disposable diaper 1. FIG.

The disposable diaper 1 includes a liquid-permeable top sheet 2 made of a non-woven fabric, a liquid-impermeable back sheet 3 made of a plastic film, and an intervening sheet between the top sheet 2 and the back sheet 3, which are bonded by an adhesive. An absorbent core 4 is bonded to at least one of the inner surfaces of the sheets 2 and 3.

The diaper 1 has a front waistline region 10, a rear waistline region 11, and a crotch region 12 located between the front and rear waistline regions 10, 11 in a longitudinal direction intersecting the waistline direction. The front and rear waist regions 10 and 11 overlap with each other at both side edges of the diaper 1 and are joined at a portion 5 arranged intermittently in the vertical direction, and a waist opening 6 and a pair of left and right leg openings 7 are provided. And form. Front and rear waist area 10,1
A plurality of waist elastic elastic members 8
Are joined to the inner surface of the back sheet 3 in an extended state, and two of them are traversing the width direction of the core 4. A plurality of leg elastic elastic members 9 are provided on the periphery of the leg opening 7.
Is bonded to the inner surface of the back sheet 3 in an extended state. In the leg opening 7, the side flaps 13 are formed by integrally joining the overlapping portions of the top sheet 2 and the back sheet 3 extending laterally from both side edges of the core 4. When the stretched state of the elastic elastic members 8, 9 is released, gathers are formed in the front and rear waist regions 10, 11 and the leg opening 7, respectively.

FIG. 2 is a sectional view taken along the line AA of the diaper 1 of FIG.

Each of the waist elastic elastic members 8 is covered by the inner surface of the back sheet 3 over substantially the entire periphery of the elastic elastic member 8 in a cross section in the width direction crossing the longitudinal direction. The elastic elastic member 8 is intermittently joined to the inner surface of the back sheet 3. In order not to substantially expose each of the elastic elastic members 8 from the back sheet 3, it is preferable that the elastic length of the elastic elastic member 8 be at least の or more, and more preferably 2 or more, of the perimeter of the elastic elastic member 8 in a cross section crossing the longitudinal direction. / 3
The above is covered with the inner surface of the back sheet.

Although not shown, in order to cover the periphery of each elastic elastic member 8 with the back sheet 3, a pair of first rolls and a pair of second rolls disposed downstream of the first rolls are provided.
A coating device for intermittently applying an adhesive to the elastically stretchable member 8, the coating device being disposed between the first roll and the second roll, and a pair of third rolls disposed downstream of the second roll; And to use. The elastic member 8 and the back sheet 3 move from the first roll to the third roll along the longitudinal direction. A plurality of grooves each having an arc-shaped cross section slightly larger than the cross section in the width direction of the elastic elastic member 8 are formed over the entire circumference in one circumferential direction of the pair of second rolls.

The elastically stretchable member 8 moves while being stretched due to a difference in rotation speed between the first roll and the second roll, and an adhesive is applied by a coating device during the stretching process. Furthermore, the elastic elastic member 8 contacts the inner surface of the back sheet 3 and heads toward the second roll. In the second roll, the elastic elastic member 8 extends along the groove of the second roll, and the outer surface of the back sheet 3 abuts on the peripheral surface of the second roll. At this time, the elastic elastic member 8 is in a state of being pressed against the inside of the groove of the second roll, and a part of the back sheet 3 pressed by the elastic elastic member 8 together with the elastic elastic member 8 It enters the groove of two rolls. The elastic elastic member 8 and a part of the back sheet 3 are joined inside the groove, and the periphery of each elastic elastic member 8 is covered with the back sheet 3. The back sheet 3 to which the elastic elastic member 8 is bonded is directed to the third roll. For the waist elastic elastic member 8, it is preferable to use string-like natural rubber or synthetic rubber having a circular or elliptical cross-section in the width direction. It is preferable to use a melt adhesive.

FIGS. 3 and 4 are cutaway views of a mode different from FIG.

In FIG. 3, a liquid-permeable top sheet 2, a liquid-impervious back sheet 3, and an absorbent core 4 interposed between the top sheet 2 and the back sheet 3 are provided. Each of the elastic members 8 is joined to the outer surface of the back sheet 3, and substantially the entire periphery of the elastic stretch member 8 in a cross section in a width direction crossing the longitudinal direction is covered with the back sheet 3.

In FIG. 4, the back sheet 3 is formed by a plastic film 3a and a nonwoven fabric 3b bonded to the outer surface of the plastic film 3a. Each of the waist elastic elastic members 8 is joined to the inner surface of the nonwoven fabric 3b, and substantially the entire periphery of the elastic elastic member 8 in the width direction cross section that intersects the longitudinal direction is covered by the inner surface of the nonwoven fabric 3b. Each elastic elastic member 8 is made of non-woven fabric 3b
It can also be joined to the outer surface of the device. 3 and 4,
Preferably, 1/2 or more, more preferably 2/3 or more, of the perimeter in the cross section in the width direction intersecting the longitudinal direction of the elastic elastic member 8 is the outer surface of the back sheet or the back sheet 3.
Is covered with the nonwoven fabric 3b.

[0019]

According to the disposable diaper according to the present invention,
There is no need to cover the elastic sheet with the top sheet and the back sheet. Since the number of joints between the top sheet and the back sheet in the region where the elastic elastic member is present can be reduced, it is useful for improving the feeling of wearing.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a mode different from that of FIG. 1;

FIG. 4 is a cross-sectional view of a mode different from FIGS.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diaper 2 Top sheet 3 Back sheet 3a Plastic film 3b Nonwoven fabric sheet 4 Absorbent core 8 Waist elastic elastic member 10 Front waist area 11 Rear waist area 12 Inseam area

Continued on the front page (72) Inventor Toshifumi Ohtsubo 1531-7 Takasuka, Wadahama, Toyohama-cho, Mitoyo-gun, Kagawa Pref. Unicharm Corporation

Claims (2)

[Claims] 1. A liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-absorbent core interposed between these two sheets, and a longitudinal direction intersecting a waist direction is a front waist area. And a rear waist region and a crotch region located between the two regions. An elastic elastic member extending in a circumferential direction around the front and rear waist region includes a longitudinal portion of the member. The diaper according to claim 1, wherein at least 1/2 of the perimeter in a cross section in a width direction crossing the direction is covered with the back sheet. 2. The elastic sheet according to claim 2, wherein the back sheet is formed of a plastic film and a non-woven fabric bonded to an outer surface of the plastic film, and the elastically stretchable member extending in a circumferential direction around the front and rear waist region is provided. The diaper according to claim 1, wherein at least half of the circumference in a cross section in a width direction intersecting with the longitudinal direction is covered with the nonwoven fabric.