Filter

Details Filter Filter

1979-08-10

1981-03-24

Nozick, Bernard

Gas separation

Flexible or collapsible bag type

Seaming, reinforcing or bag structure

55291, 55302, 55473, 55487, 55498, 55524, 55528, B01D 4600

Patent

active

042577918

ABSTRACT:
There is provided a filter wherein the filtering means has a non-woven needled textile filter fabric with an overall bulk density of at least 6 pounds per cubic foot and bulk density gradient such that the bulk density at the face surface of the fabric is greater than the bulk density at the back surface of the fabric. In conjunction with that bulk density gradient is a filtering gradient such that the fineness of filtration at the back face surface is greater than the fineness of filtration at the surface. The filter may be in any convenient form, such as the bag of an air conveyor filter or a vacuum cleaner filter.

REFERENCES:
patent: 1530674 (1925-03-01), Jackson
patent: 2138874 (1938-12-01), Myers
patent: 2933154 (1960-04-01), Lauterbach
patent: 2980204 (1961-04-01), Jordan
patent: 3399516 (1968-09-01), Hough, Jr. et al.
patent: 3483679 (1969-12-01), Balbierer
patent: 3675403 (1972-07-01), Ruffo
patent: 4093437 (1978-06-01), Ichihara et al.
patent: 4100323 (1978-07-01), Forsten
patent: 4164400 (1979-08-01), Wald
Dietrich-Dust Filtration with Needle Felts-Filtration and Separation, Jul.-Aug. 1972, pp. 438-443. _

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