Absorbent material and a method of making same

Details Absorbent material and a method of making same Absorbent material and a method of making same

1996-03-14

1997-05-13

Page, Thurman K.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Wearing apparel, fabric, or cloth

442361, 442403, 442415, A61L 1522

Patent

active

056290055

ABSTRACT:
An absorbent material suitable for use as a medical or hygienic absorbent and comprises a non-woven fibre sheet having dense surface layers 10 and between these layers a less dense region where most of the fibres extend in the plane of the sheet. Transversely extending fibres 16 help to bind the material, the fibres also being bonded to some extent by a hot melt bonding material, e.g. core/sheath-type bi-component fibres. The material is made by forming a blend of fibres, including a minor weight of hot melt fibres, by cross-lapping a plurality of layers 14 to form a web, subjecting the web to needling at low punch density with penetration through the web, thereafter subjecting surface regions 10 of the web to higher punch density needling to form the dense surface layer 10 at each face from the web. The web is then heated, e.g. by high temperature air, to soften the hot melt material and to cause it to bond adjacent fibres while retaining its fibrous form and without significant shrinkage of the web as a whole.

REFERENCES:
patent: 4537822 (1985-08-01), Nanri et al.
patent: 4761322 (1988-08-01), Raley
patent: 4804378 (1989-02-01), Shiba et al.
patent: 4857065 (1989-08-01), Seal
patent: 4892534 (1990-01-01), Datta
patent: 5104703 (1992-04-01), Rachman
patent: 5217782 (1993-06-01), Moretz

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