Air filter having electrostatically active nonwoven fabric inliners and their use
AssigneeCarl Freudenberg KG
InventorsWolfram Schultheiss, Armin Greiner, Silke Frank
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Abstract
A multi-layer air filter is described, including a filter layer which is covered by a prefilter layer on the dust-laden gas side, which has a laid dry electrostatically effective nonwoven fabric, preferably a staple fiber nonwoven fabric, whose area weight is 10 through 100 g/m2. In particular, the filter may be used as a vacuum cleaner bag.
Claims19
A multi-layer air filter comprising a filter layer and a prefilter layer covering it on a dust-laden side thereof, the prefilter layer having a dry-laid and electrostatically effective nonwoven fabric, whose mass per unit area is from 10 to 100 g/m2 and an NaCl degree of permeability DNaCl of less than or equal to 40%.
Dependencies are inferred from the claim text.