Process for high performance, permeable fibrous structure

Details Process for high performance, permeable fibrous structure Process for high performance, permeable fibrous structure

1996-04-22

1998-07-14

McCamish, Marion E.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156311, 427244, 427180, 427185, 442417, B32B 3120

Patent

active

057798478

ABSTRACT:
A novel, high performance yet permeable, tough, fibrous structure, and a process for making the structure are disclosed. The fibrous structure includes a stabilized microstructure of improved uniformity of fiber and particulate distribution. Beneficially, the fibrous structure is of improved structural integrity and stiffness, as a result of being reduced in thickness.
The process includes the steps of dry forming a fibrous web including crimped staple composite fibers, thereafter distributing and entrapping the functional particles in the web, and thereafter heating the fibrous web to form a microstructure-stabilized fibrous web. According to the process, the microstructure-stabilized fibrous web is thereafter by an additional heat treating step carried out without application of pressure to the web, heated to a thermoforming temperature, and thereafter the heated web is reduced in thickness and yet microstructural relative geometry is maintained. IR heat may be used. A nip gap is advantageously used to reduce the heated web in thickness.

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patent: 5582865 (1996-12-01), Rezuke et al.
patent: 5605746 (1997-02-01), Groeger et al.
patent: 5626820 (1997-05-01), Kinkead et al.

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