Absorbent article

• US 7,884,259 B2
• Filed: 06/28/2005
• Issued: 02/08/2011
• Est. Priority Date: 06/28/2004
• Status: Expired due to Fees

• Current Assignee: DAIO Paper Corporation
• Original Assignee: DAIO Paper Corporation
• Inventors: Hanao, Hiroyuki, Matsui, Tomotsugu, Maeda, Toshikazu, Furudoi, Takeshi, Yano, Hiroyuki, Kubo, Taira, Fukae, Akinori, Miyashita, Yoshiharu
• Primary Examiner(s): SINGH-PANDEY, ARTI R
• Application Number:
  US11/630,913
• Publication Number:
  US 20080044616A1
• Time in Patent Office: 2,051 Days
• Field of Search: 442/417, 428/156, 604/375, 604/385.101, 604/385.19, 604/383
• US Class Current: 604/358
• CPC Class Codes: A61F 13/15203 Properties of the article, e.g. stiffness or absorbency chemical aspects A61L15/00
• CPC Class Codes: A61F 13/537 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer A61F13/538 takes precedence
• CPC Class Codes: A61F 2013/530518 the maximum being at the crotch
• CPC Class Codes: A61F 2013/530547 positioned in a separate layer or layers
• CPC Class Codes: A61F 2013/530598 in aggregates
• CPC Class Codes: A61F 2013/5307 characterized by the quantity or ratio of superabsorbent material
• CPC Class Codes: A61F 2013/530708 characterized by the absorbency properties
• CPC Class Codes: A61F 2013/530715 by the acquisition rate
• CPC Class Codes: A61F 2013/530729 by the swelling rate
• CPC Class Codes: A61F 2013/530737 by the absorbent capacity
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: Y10T 428/23 Sheet including cover or casing
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 442/699 Including particulate material other than strand or fiber material

Abstract

An absorbent article including a fiber aggregate formed by opening the tow, a super absorbent polymer particle, and a sheet covering these components. The super absorbent polymer particle are bonded to the sheet with an adhesive that is applied in a continuous plane to the entire surface or the substantially entire surface at least at the portion to be provided with the super absorbent polymer particle in this sheet.

Claims

1. An absorbent article comprising

a body fluid permeable top sheet,

a body fluid impermeable sheet,

an absorbent body provided between the body fluid permeable top sheet and the body fluid impermeable sheet, and

an exterior sheet of a non-woven fabric provided on a back surface side of the body fluid impermeable sheet,

wherein

the absorbent body includes

a fiber aggregate formed by opening a tow,

an absorbent core having a super absorbent polymer particle retained within the fiber aggregate, and

a covering sheet covering at least a backside and sides of the absorbent core;

the absorbent core has a thickness of 1 to 5 nun;

the fiber aggregate comprises crimped fibers having a fineness of 1 to 16 deniers and a degree of crimps of 15 to 50 numbers per one inch, a fiber basis weight of said fiber aggregate being 0.075 g/cm² or less;

an amount of water absorption of the super absorbent polymer particle is 50 g/g or higher, and a particle diameter of the super absorbent polymer particle is 20-850 μ

m;

a basis weight of the super absorbent polymer particle in the absorbent core is 400 g/cm² or below, and a weight ratio of super absorbent polymer particle/filament in a planer area of 5 cm×

5 cm in a region of directly receiving body fluids in the absorbent core is 3 to 9;

a holding sheet is provided, on a backside of the absorbent body, between the absorbent core and the covering sheet, the holding sheet being applied with hot melt adhesives so that the super absorbent polymer particle slipped out of the fiber aggregate is held on the holding sheet via the hot melt adhesives and prevented from moving; and

the holding sheet is composed of non-woven cloth that has a rough surface or fuzzing surface on a top face thereof.

2. The absorbent article according to claim 1 wherein the top face of the holding sheet is a non-net face at a time of manufacturing of the non-woven cloth.

3. The absorbent article according to claim 1, wherein the top face of the holding sheet is processed by one selected from marble machining, needle-punching and brushing.

4. The absorbent article according to claim 1, wherein the particle diameter of 87.9% of the super absorbent polymer particle is not less than 250 μ

m.