Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1977-10-07
1978-07-11
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
28104, 55DIG16, 55528, 428300, 428359, D04H 108
Patent
active
041003233
ABSTRACT:
A scrimless, dimensionally stable filter felt suitable for high temperature gas filtration is comprised of at least 80% by weight poly(m-phenylene isophthalamide) staple fibers having at least a low degree of crystallinity and a staple length of 4 to 16 cm., and has a felt density of 0.15 to 0.4 g./cm..sup.3 and an air permeability of 3 to 30 m..sup.3 /min./m..sup.2 (0.degree. C. basis pressure differential = 1.27 g./cm..sup.3.
REFERENCES:
patent: 2910763 (1959-11-01), Lauterbach
patent: 3133138 (1964-05-01), Alexander
patent: 3920428 (1975-11-01), Kinsley
patent: 3937860 (1976-02-01), Gusman et al.
Bell James J.
E. I. Du Pont de Nemours and Company
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