Process for the manufacture of a permeable sheet-like fibrous st

Details Process for the manufacture of a permeable sheet-like fibrous st Process for the manufacture of a permeable sheet-like fibrous st

1989-05-31

1990-12-18

Fertig, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

With subsequent cutting, grooving, breaking, or comminuting

156166, 156296, 264119, 264122, 264128, 264137, B32B 516, B29C 4302

Patent

active

049784897

ABSTRACT:
A process for the manufacture of a stiff permeable sheet-like fibrous structure which includes forming a web with 20% to 60% single fibres having a high modulus of elasticity (as herein defined) and between 7 and 50 millimeters long, and 40% to 60% by weight of a wholly or substantially unconsolidated particulate plastics material, and then treating the web by heating to melt the plastics material and passing it between a pair of nip rollers so that the plastics material can flow and wet out the fibres, the nip between the rollers being set to a dimension less than the thickness of the unconsolidated web and greater than that of the web if it were to be fully consolidated, and allowing the web to expand and remain substantially permeable after passing through the rollers.

REFERENCES:
patent: 1875018 (1932-08-01), Kliefoth
patent: 1901382 (1933-03-01), Stevenson
patent: 2388187 (1945-10-01), Salle 162164.1
"Polymer Processing", James M. McKelvey, 1962.
"Paints and Varnishes--Determination of Flow Time by Use of Flow Cups", International Standard ISO 2431, 1984.
"Part A6, Determination of Flow Time by Use of Flow Cups", British Standards Institution, 1984.
"Fibre Foam", Turner & Cogswell, 1976, presented at VIIth International Congress on Rheology in Sweden, Aug. 23-Aug. 27, 1976.
Siemens AG Digest, Abstract 24 181 Q.
1004 Abstracts Bulletin of the Institute of Paper Chemistry, vol. 53 (1982), Aug., No. 2, Appleton, Wisc., U.S.A.

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