Filter media for long-term high temperature applications
AssigneeSouthern Felt Company, Inc.
InventorsEric Winters, John Lewis, Brian Fields, Jin Choi
Life of this patent
Estimating the term…
Abstract
A filter media is generally described including an upstream layer of a nonwoven fiber having a denier between about 5.0 and 7.0 and a weight of between about 3.0 and 5.0 opsy, optionally a scrim, and a cap layer of a fiber having a denier between about 0.1 and 5.0, and a weight between about 2.0 and 4.0 opsy carried by the upstream layer and disposed downstream from the upstream layer. The upstream layer, scrim and cap layer can have a weight of about 4.0 opsy, 2.0 opsy and 3.0 opsy respectively. A downstream layer can be disposed between the upstream layer and the cap layer.
Claims22
A filter media configured for long term high temperature applications, comprising:
- an upstream layer comprised of nonwoven fiber having a denier between about 5.0 and 7.0, and a weight of between about 3 and 5 opsy;
- and
- a cap layer comprising a first fiber having a denier between about 1.0 and 2.0 and a second fiber having a denier between about 1.75 and 2.75, wherein the cap layer has a weight between about 2.0 and 4.0 opsy, carried by said upstream layer and disposed downstream from said upstream layer,
- wherein the filter media exhibits a substantially stable tensile strength at a temperature of at least about 300° F. for at least about 24 hours, and wherein pressure drop across the filter media is less than about 10.4 inches Hg for a flow rate of oil or transmission fluid up to about 40.7 lpm at a temperature of about 24° C.
A filter media configured for long term high temperature applications, comprising:
- an upstream layer of nonwoven fiber, wherein said upstream layer has a thickness greater than about 50% of the overall thickness of said filter media, a weight in the range of 20% to 60% of the total weight of said filter media and an average fiber diameter between about 10 to 40 microns;
- a scrim disposed adjacent to said upstream layer, arranged downstream from said upstream layer, said scrim being between about 10% to 40% of the total weight of said filter media;
- and
- a cap layer of nonwoven fiber carried by said scrim disposed downstream of said upstream layer having a denier between about 0.1 to 5.0 , a weight of about 10% to 30% of the total weight of said filter media and a fiber diameter between about 1 to 21 microns,
- wherein the filter media exhibits a substantially stable tensile strength at a temperature of at least about 300° F. for at least about 24 hours, and wherein pressure drop across the filter media is less than about 10.4 inches Hg for a flow rate of oil or transmission fluid up to about 40.7 lpm at a temperature of about 24° C.
A filter media configured for long term high temperature applications, comprising:
- an upstream layer of nonwoven fiber, wherein said upstream layer has at least one of the following characteristics:
- (a) a thickness greater than about 50% of the overall thickness of said filter media, (b) a weight in the range of 20% to 60% of the total weight of said filter media, and (c) an average fiber diameter between about 10 to 40 microns;
- and
- a cap layer of nonwoven fiber carried by a scrim and disposed downstream of said upstream layer, wherein the cap layer has at least one of the following characteristics:
- a denier between about 0.1 to 5.0, a weight of about 10% to 30% of the total weight of said filter media and a fiber diameter between about 1 to 21 microns,
- wherein the filter media exhibits a substantially stable tensile strength at a temperature of at least about 300° F. for at least about 24 hours, and wherein pressure drop across the filter media is less than about 10.4 inches Hg for a flow rate of oil or transmission fluid up to about 40.7 lpm at a temperature of about 24° C.
Dependencies are inferred from the claim text.