Aromatic polyamide paper with thickened edge areas and process f

Details Aromatic polyamide paper with thickened edge areas and process f Aromatic polyamide paper with thickened edge areas and process f

1990-07-13

1991-07-02

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-uniform, irregular or configured web or sheet

162109, 162146, 162195, 162208, D21F 1100

Patent

active

050283006

ABSTRACT:
Disclosed is an elongate, nonwoven flexible sheet structure and a method for its manufacture. The sheet structure consists essentially of a commingled mixture of about 45 to about 70% by weight short fibers of aromatic polyamide and about 30 to about 55% by weight fibrids of poly(meta-phenylene isophthalamide). The sheet structure has an interior thickness remote from the edges of between about 75 and about 150 microns with a thickened area along and adjacent each of the side edges having a maximum thickness which is at least about 5% greater in average thickness than the interior thickness of the sheet along and adjacent the thickened areas.

REFERENCES:
patent: 3493463 (1970-02-01), Baker
patent: 3756908 (1973-09-01), Gross
patent: 4239591 (1980-12-01), Blake
patent: 4818343 (1989-04-01), Laine

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