Multilayer electret filter and process of using same

Details Multilayer electret filter and process of using same Multilayer electret filter and process of using same

1988-09-09

1989-12-12

Woo, Jay H.

Gas separation

Means within gas stream for conducting concentrate to collector

55482, 55487, 55DIG39, 55307, 55400, B03C 902, G11C 1302

Patent

active

048865273

ABSTRACT:
A multilayer filter pack includes at least three adjacent layers of fibrous material, each of which is permanently electrically charged and not more than 10 mm thick. The upstream and middle layers are formed from fibers having a fiber diameter that decreases from layer to layer in the direction of flow and are arranged at a packing density that increases from layer to layer in the direction of flow. The third layer has a fiber diameter and packing density that is approximately equal to the fiber diameter and packing density of the first layer. The multilayer filter pack is particularly well suited for use in air-purifying systems and breath protection filters.

REFERENCES:
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patent: 3449094 (1969-06-01), Baxt et al.
patent: 4093437 (1978-06-01), Ichihara et al.
patent: 4133653 (1979-01-01), Soltis
patent: 4215682 (1980-08-01), Kubik et al.
patent: 4323374 (1982-04-01), Shinagawa et al.
patent: 4513049 (1985-04-01), Yamasaki et al.
patent: 4650506 (1987-03-01), Barris et al.
patent: 4661255 (1987-04-01), Aumann et al.
patent: 4759782 (1988-07-01), Miller et al.
"Particle Collection in Electret Fiber Filters-A Basic Theoretical and Expertmental Study" pp 346-351 from Sep./Oct. 1987 Issue of Filtration & Separation by H. Baumgartner et al.

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