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US 6,974,490 B2Granted
Air filtration arrangements having fluted media constructions and methods
AssigneeDonaldson Company, Inc.
InventorsGary R. Gillingham, Mark A. Gogins, Thomas M. Weik
Life of this patent
Estimating the term…
Abstract
Filter arrangements include a barrier media in the form of fluted media treated with a deposit of fine fibers. The media is particularly advantageous in high temperature (greater than 140 to 240° F.) systems. Such systems may include engine systems, gas turbine systems, and fuel cell systems. Filter arrangements may take the form of media packs having a circular cross-section or a racetrack shaped cross-section, or media packs formed in a panel configuration.
Claims66
A filter element arrangement comprising:
- (a) a media pack including a corrugated substrate secured to a non-corrugated substrate;
- each substrate being selected from media comprising natural fibers and media comprising a mixture at natural and synthetic fibers;
- each substrate having a filter efficiency measured under ATSM 1215-89 with 0.78μ monodispersed polystyrene spherical particles, at 20 fpm, and a basis weight of less than about 200 grams-m−2, said substrates forming a plurality of flutes in said media pack;
- wherein:
- (i) selected ones of said flutes are open at a first end portion and closed at a second end portion;
- and selected ones of said flutes being closed at a first end portion and open at a second end portion;
- and
- (ii) said substrates each comprising at least one surface that is at least partially covered by a layer comprising a line fiber layer having a basis of weight of about 0.01 to 240 micrograms-cm−2, the fine fiber comprising a polymer selected from the group consisting or:
- (A) nylon 66, the fine fiber having a fiber size of about 0.01 to 0.5 micron;
- (B) a blend of a hydrophobic additive and a polymer comprising a blend of at least two different nylon polymers, the fine fiber having a fiber size of about 0.01 to 0.5 micron;
- (C) a blend of a hydrophobic additive and a nylon polymer comprising a nylon other than a copolymer formed from a cyclic lactam and a C6-10 diamine monomer or a C6-10 diacid monomer, the fine fiber having a fiber size of about 0.01 to 0.5 micron;
- or
- (D) mixtures thereof;
- (c) a seal system secured to an outside of the media pack, for sealing the filter arrangement in place, during use.
11 more elements
A filter element arrangement comprising:
- (a) a media pack including a corrugated substrate secured to a non-corrugated substrate;
- each substrate being selected from media comprising natural fibers and media comprising a mixture of natural and synthetic fibers;
- each substrate having a filter efficiency measured under ASTM 1215-89 with 0.78μ monodispersed polystyrene spherical particles, at 20 fpm, and a basis weight of less than about 200 grams-m−2, said substrates forming a plurality of flutes in said media pack;
- wherein:
- (i) selected ones of said flutes are open at a first end portion and closed at a second end portion;
- and selected ones of said flutes being closed at a first end portion and open at a second end portion;
- and
- (ii) said substrates each comprising at least one surface that is at least partially covered by a layer comprising a fine fiber layer having a basis of weight of about 0.01 to 240 micrograms-cm−2, the fine fiber comprising a polyvinyl alcohol polymer, the fiber having a fiber size of about 0.01 to 0.5 micron;
- (c) a seal system secured to an outside of the media pack, for sealing the filter arrangement in place, during use.
6 more elements
A filter element arrangement comprising:
- (a) a media pack including corrugated substrate secured to a non-corrugated substrate;
- each substrate being selected from media comprising natural fibers and media comprising a mixture of natural and synthetic fibers;
- each substrate having a filter efficiency measured under ASTM 1215-89 with 0.78μ monodispersed polystyrene spherical particles, at 20 fpm, and a basis weight of less than about 200 grams-m−2, said substrates forming a plurality of flutes in said media pack;
- wherein:
- (i) selected ones of said flutes are open at a first end portion and closed at a second end portion;
- and selected ones of said flutes being closed at a first end portion and open at a second end portion;
- and
- (ii) said substrates each comprising at least one surface that is at least partially covered by a layer comprising a fine fiber layer having a basis of weight of about 0.01 to 240 micrograms-cm−2, the fine fiber comprising a polyvinyl chloride polymer, the fiber having a fiber size of about 0.01 to 0.5 micron;
- (b) a seal system secured to an outside of the media pack, for sealing the filter arrangement in place, during use.
6 more elements
Dependencies are inferred from the claim text.