Filter for removing smoke and toner dust in electrophotographic/

Details Filter for removing smoke and toner dust in electrophotographic/ Filter for removing smoke and toner dust in electrophotographic/

1987-12-03

1990-07-03

Nozick, Bernard

Gas separation

Means within gas stream for conducting concentrate to collector

55124, 55155, 55487, 55524, 55528, 55316, B03C 300

Patent

active

049387863

ABSTRACT:
An air filter structure is described including a plurality of filter units, wherein a first filter unit made of electrostatically charged fibrous material is utilized at the inlet side of the air filter. The first filter unit has a comparatively greater porosity than the remaining filter units and attracts and removes toner particles charged with an opposite polarity to that of electrostatically charged fibrous material in the first filter unit. Therefore, the air, with a substantial part of toner dust removed, can more easily enter into the remaining filter units for removal of smoke, resulting in increased useful life of the air filter.

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