Disposable diaper

• US 6,099,515 A
• Filed: 01/25/1999
• Issued: 08/08/2000
• Est. Priority Date: 01/30/1998
• Status: Expired due to Term

• Current Assignee: Unicharm Corporation
• Original Assignee: Unicharm Corporation
• Inventors: Sugito, Tomoko
• Primary Examiner(s): YASKO JR, JOHN D
• Application Number:
  US09/236,071
• Time in Patent Office: 561 Days
• Field of Search: 604/385.1, 604/385.2, 604/378, 604/379, 604/358, 604/365, 604/367, 604/374, 604/375
• US Class Current: 604/385.01
• CPC Class Codes: A61F 13/4946 the edge leakage prevention means being an absorbent medium A61F13/49426 takes precedence
• CPC Class Codes: A61F 13/536 having discontinuous areas of compression
• CPC Class Codes: A61F 2013/4587 with channels or deep spot depressions on the upper surface A61F13/4704 and A61F13/49001 take precedence
• CPC Class Codes: A61F 2013/530532 the maximum being at certain depth in the thickness
• CPC Class Codes: A61F 2013/530562 being arranged in discontinuous pattern

Abstract

A disposable diaper includes a liquid-absorbent core which is formed by laminating a fibrous layer principally comprising fluff pulp fibers with a particle layer principally comprising superabsorptive polymer particles. The core is divided along longitudinal lines of the diaper. Each pair of adjacent core divisions present side walls opposed to each other and the particle layer is partially exposed in these side walls.

Claims

1. A disposable diaper comprising a liquid-pervious topsheet, a liquid-impervious backsheet and a liquid-absorbent core disposed therebetween, defining a front waist region, a rear waist region and a crotch region extending therebetween, wherein said core is at least partially divided along longitudinal lines extending from said front waist region into said rear waist region via said crotch region so as to form a plurality of core divisions, wherein:

said core comprises at least one fibrous layer principally consisting of fluff pulp and at least one particle layer principally consisting of superabsorptive polymer particles, substantially forming a laminate of said fibrous layer and said particle layer underlying said fibrous layer, wherein said particle layer is partially exposed in side walls of the respective core divisions.

2. A disposable diaper according to claim 1, wherein said core is divided not only along said longitudinal lines but also along transverse lines extending orthogonally to the longitudinal lines.

3. A disposable diaper according to claim 1, wherein said topsheet extends downwards along each pair of opposite side walls between each pair of adjacent core divisions so as to be placed upon and bonded to said backsheet.