Disposable Diaper

Abstract

A disposable diaper includes so that a sweat-absorbent sheet attached to the inner side of the diaper can maintain its sweat absorbing function during use of the diaper. The inner side of front or rear waist region constituting the disposable diaper is covered with a hydrophobic sheet and the sweat-absorbent sheet is bonded to the inner surface of the hydrophobic sheet. The hydrophobic sheet has a first sealing-free zone extending, inclusive of a first lower edge, in a circumferential direction so as to be left free from the inner side of the diaper and a first sealing zone extending above the first sealing-free zone and bonded to the inner side of the diaper. The sweat-absorbent sheet has a second lower edge extending in the circumferential direction above the first lower edge of the hydrophobic sheet, a second sealing-free zone extending, inclusive of the second lower edge, in the circumferential direction so as to be left free from the hydrophobic sheet and a second sealing zone extending above the second sealing-free zone and bonded to the hydrophobic sheet. A lower end of the first sealing zone is provided so as to lie below a lower end of the second sealing zone.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partially cutaway perspective view showing a diaper according to the present invention;

FIG. 2 is a partially cutaway plan view showing the diaper of FIG. 1 as disintegrated along transversely opposite sides thereof and then developed;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a sectional view illustrating an example of sweat-absorbent sheet;

FIG. 6 is a view similar to FIG. 2, illustrating one preferred embodiment of the invention; and

FIG. 7 is a view similar to FIG. 6, illustrating another preferred embodiment of the invention.

Claims

1. A disposable diaper comprising a crotch region, a front waist region extending forward from said crotch region and a rear waist region extending rearward from said crotch region wherein said front waist region and rear waist region respectively having a front edge and a rear edge cooperating together to define a peripheral edge of a waist-hole, a body fluid absorbent core extending in said crotch region and further into said front waist region and said rear waist region wherein said body fluid absorbent core has a front end in said front waist region and a rear end in said rear waist region, a liquid-pervious sheet extending on the inner side of said crotch region and a liquid-impervious sheet extending on the outer side of said crotch region so as to sandwich said body fluid absorbent core therebetween wherein on said inner side, hydrophobic sheets covering said front and rear waist regions in a zone defined between vicinity of said front edge of said front waist region and vicinity of said front end of said core rear edge, and between vicinity of said rear edge of said rear waist region and vicinity of said rear end of said core, and a sweat-absorbent sheet attached to a part of the inner surface of said hydrophobic sheet in any one of said front and rear waist regions, said disposable diaper further comprises: said hydrophobic sheet to which said sweat-absorbent sheet is attached having a vertical dimension larger than a vertical dimension of said sweat-absorbent sheet as viewed in a vertical direction of said diaper wherein said hydrophobic sheet has a first upper edge extending circumferentially of said diaper in the vicinity of the peripheral edge of said waist-hole, a first lower edge extending, inclusive of said first lower edge, circumferentially of said diaper in the vicinity of any one of said front and rear ends of said core, a first sealing-free zone extending, inclusive of said first lower edge, circumferentially of said diaper so as to be left free from said liquid-pervious sheet and a first sealing zone extending above said first sealing-free zone so as to be bonded to said liquid-pervious sheet;said sweat-absorbent sheet having a second upper edge lying below said first upper edge of said hydrophobic sheet so as to extending circumferentially of said diaper, a second lower edge lying above said first lower edge of said hydrophobic sheet so as to extend circumferentially of said diaper, a second sealing-free zone extending, inclusive of said second lower edge, circumferentially of said diaper so as to be left free from said hydrophobic sheet and second sealing zone lying above said second sealing-free zone so as to be bonded to said hydrophobic sheet; anda lower end of said first sealing section lying below a lower end of said second sealing zone.

2. The disposable diaper defined by claim 1, wherein said rear waist region is provided with a plurality of elastic members bonded thereto while stretched in circumferential direction so as to form gathers undulating in said circumferential direction and, in said sweat-absorbent sheet, said vertical dimension of said second sealing-free zone is in a range of 5 to 30 mm so that said second sealing-free zone may be formed with gathers each having a width larger than each of said gathers formed by said second sealing zone.

3. The disposable diaper defined by claim 2, wherein said sweat-absorbent sheet has a third sealing-free zone extending, inclusive of said second upper edge, in said circumferential direction so as to be left free from said hydrophobic sheet, said vertical dimension of said third sealing-free zone is in a range of 5 to 30 mm so that said third sealing-free zone may be formed with gathers each having a width larger than each of said gathers formed by said second sealing zone.

4. The disposable diaper defined by claim 1, wherein said vertical dimension of said first sealing-free zone in said hydrophobic sheet is in a range of 2 to 20 mm and there is no possibility that said first sealing-free zone might overlap said sweat-absorbent sheet even when said first sealing-free zone is folded back toward said first upper edge.