Enhanced electret needled filtration media and composites

Details Enhanced electret needled filtration media and composites Enhanced electret needled filtration media and composites

1997-03-14

1999-02-23

Raimund, Christopher

Fabric (woven, knitted, or nonwoven textile or cloth, etc.)

Nonwoven fabric

Including an additional nonwoven fabric

428218, 428219, 442341, 442345, 442351, 28107, B32B 506

Patent

active

058743731

ABSTRACT:
An enhanced filtering media composite formed of a first electret media layer attached uniformly onto a second non-woven fibrous media layer by a special needling construction and procedure, so as to provide a needled media composite having increased mechanical strength and particle retention capacity. The first media electret layer is composed of about 50 wt. % mixture of polypropylene and modacrylic fibers, and the second media layer is composed of 80% 3 denier.times.3 inch polyester staple and 1.4 denier.times.1.5 inch polyester staple fibers, the fibers of one layer being selectively needled into the other layer using controlled needling density penetration, depth and repetitions to provide a composite having improved mechanical strength and filtration performance.

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