Filter medium and 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.
Claims23
A filtration medium comprising a depth loading medium having a thickness of 0.1 to 2 mm comprising a thermally bonded nonwoven structure comprising bicomponent fibers blended with glass fibers, wherein the bicomponent fibers have a concentric sheath-core structure consisting essentially of polyester or polyamide, the filtration medium having a solidity of about 2 to 25%, a basis weight of about 10 to 300 g/m2, and a compressibility of 25% or less when pressure is varied from 0.125 lb/in2 to 0.625 lb/in2.
Dependencies are inferred from the claim text.