Polymeric fiber and glass fiber composite filter media

Details Polymeric fiber and glass fiber composite filter media Polymeric fiber and glass fiber composite filter media

1997-04-14

1998-07-28

Smith, Duane

Gas separation

Flexible or collapsible bag type

Seaming, reinforcing or bag structure

55486, 55487, 55527, 55528, 210488, 210492, 210509, 442390, B01D 3916, B01D 3920

Patent

active

057857253

ABSTRACT:
A composite filter media for bag or pocket filters and the like includes an upstream dirt-holding layer of fine polymeric fibers and a downstream high efficiency filtration layer of glass fibers. The upstream layer includes polymeric microfibers having a mean fiber diameter ranging from about 2.5 to about 4.5 microns, lofting fibers and binder fibers; and weighs between about 2.0 and about 7.0 grams per square foot. The glass fiber layer has a weight between about 1.2 and about 2.7 grams per square foot; the average diameter of the fibers in the glass fiber layer is within a range from 3.0.times.10.sup.-5 to 4.1.times.10.sup.-5 inches; and the fibers are bonded together at their points of intersection with a binder. The composite filter media has an average air filtration efficiency of at least 80%.

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