Light weight filter felt

Details Light weight filter felt Light weight filter felt

1985-01-07

1985-08-20

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

28104, 28112, 55528, 428299, D04H 108

Patent

active

045364397

ABSTRACT:
Nonwoven fabrics of poly(m-phenylene isophthalamide) having a cross-machine modulus greater than 40, and good resistance to abrasion that is useful as a gas filtration substrate, and the process of producing such a fabric by heating an entangled web while stretching the fabric transversely 5 to 15% for a time sufficient to increase the crystallinity index at least about 0.05 units.

REFERENCES:
patent: 3508308 (1970-04-01), Bunting et al.
patent: 4100323 (1978-07-01), Forsten
patent: 4117578 (1978-10-01), Forsten

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