Filter medium and breather filter structure
AssigneeDonaldson Company, Inc.
InventorsRobert M. Rogers, Keh B. Dema
Life of this patent
Estimating the term…
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.
Claims13
1-13. (canceled)
A wet laid layer comprising a thermally bonded sheet, the sheet comprising:
- (a) about 10 to 90 wt % of a bicomponent fiber;
- and (b) an effective amount of a second fiber to obtain a pore size of about 0.5 to 100 micrometers, a permeability of about 5 to 500 ft-min.−1, a thickness of about 0.2 to 50 mm, a solidity of about 2 to 25%, a basis weight of about 10 to 1000 g-m−2.
A nonwoven filtration medium comprising:
- a loading layer having an average pore size of 5 to 30 micrometers, wherein the loading layer comprises bicomponent fibers and glass fibers, wherein the bicomponent fibers have a concentric sheath-core structure;
- and
- an efficiency layer having an average pore size of 0.5 to 3 micrometers.
A multilayer nonwoven filtration medium comprising:
- a loading layer having an average pore size of 5 to 30 micrometers;
- and
- an efficiency layer having an average pore size of 0.5 to 3 micrometers;
- wherein one or more layers comprise bicomponent binder fibers and glass fibers.
A nonwoven filtration medium comprising:
- bicomponent binder fibers having a fiber diameter of 5 to 50 micrometers;
- glass fibers having a fiber diameter of 0.1 to 30 micrometers;
- and
- monocomponent fibers.
A filtration medium comprising a thermally bonded sheet, the sheet comprising:
- about 20 to 80 wt % of a bicomponent binder fiber having a fiber diameter of about 5 to 50 micrometers;
- and
- an effective amount of glass fiber blended with the bicomponent binder fiber;
- wherein glass fiber is selected from the sources comprising an average fiber diameter of about 0.1 to 1 micrometer, 0.3 to 2 micrometers, 0.5 to 5 micrometers, 0.75 to 7 micrometers, 1 to 10 micrometers, 3 to 30 micrometers in a combination of two or more sources thereof, and in that said selected sources include the source which comprises an average fiber diameter of 3 to 30 micrometers.
A filtration medium in the form of a thermally bonded nonwoven structure, the medium comprising an amount of bicomponent fibers blended with glass fibers, wherein the bicomponent fibers are concentric sheath/core PET/PET fibers.
Dependencies are inferred from the claim text.