Filter medium and breather filter structure
AssigneeDonaldson Company, Inc.
InventorsRobert M. Rogers, Keh B. Dema
Life of this patent
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Abstract
Thermoplastic bicomponent binder fiber can be combined with other media, fibers and other filtration components to form a thermally bonded filtration media. The filtration media can be used in filter units, such as breather caps. Such filter units can be placed in the stream of a mobile fluid and can remove a particulate and/or fluid mist load from the mobile stream. The unique combination of media fiber, bicomponent binder fiber and other filtration additives and components provide a filtration media having unique properties in filtration applications.
Claims19
A filter element comprising at least two layer of a nonwoven filter media, the filter element comprising:
- (a) a first media layer comprising at least two layers of a first filter medium comprising a first fiber comprising a bicomponent fiber comprising a diameter of 5 to 50 microns, and 5 to 50 wt % of a second fiber, wherein the first filter medium has a pore size of 0.2 to 50 micrometers, a permeability of 2 to 200 ft-min−1, a solidity of about 2 to 25% at 860 Pa and a basis weight of 5 to 1000 g-m−2;
- and
- (b) A second media comprising at least one media layers of a second filter medium that is different from the first filter medium and comprising a pore size of 0.5 to 100 micrometers, a permeability of 5 to 500 ft-min−1, a solidity of about 2 to 25% at 860 Pa and a basis weight of 20 to 120 g-m−2.
Dependencies are inferred from the claim text.