Method of densifying needled non-woven webs

Details Method of densifying needled non-woven webs Method of densifying needled non-woven webs

1976-06-21

1978-05-09

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

28113, 156148, 428300, B32B 500

Patent

active

040885208

ABSTRACT:
Preparation of a non-woven web of fibrous material so as to obtain a product having considerably better mechanical characteristics than the "breathable" non-woven fabrics of the prior art, without any substantial loss of its softness, drape or porosity characteristics. A starting needle punched non-woven web consisting substantially of thermoplastic synthetic fibers is subjected to pulsating sharp blow mechanical pressure applied transversely to web surface sufficient to generate heat by inter-fiber friction and deformation work subjected on the fibers to increase the temperature of fibers to soften them and bring the fibers tightly to adhere one with another and lock together because of the non-regular shape of fiber surface and cross section caused by said treatment. Simultaneously the interstices between the fibers are reduced and the web is compacted resulting in a relatively close natural leather-like non-woven fabric. Surface density and smoothness are attained by clubbing of the fiber ends, which tend to project outwardly initially beyond a face of the web, into substantially expanded form.

REFERENCES:
patent: 1002177 (1911-08-01), Reynolds
patent: 1742338 (1930-01-01), Bettison
patent: 2178528 (1939-10-01), Dalmau
patent: 2181043 (1939-11-01), Boeddinghaus
patent: 2437689 (1948-03-01), Francis
patent: 3627602 (1971-12-01), Van Dijk
patent: 3630808 (1971-12-01), Yasui

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