Filter element and method
First Claim
Patent Images
1. A filter element comprising a layered composite of non-woven air laid and wet laid media, comprising at least three layers of a nonwoven filter media, the filter element comprising:
- (a) An upstream media comprising at least two media layers of a first filter medium that is an air laid medium, the medium comprising 1 to 100 wt % of 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 50 to 100 micrometers, a permeability of 50 to 800 ft-min−
1, a solidity of about 2 to 25% at 860 Pa, a basis weight of 150 to 350 g-m−
2, and a compressibility of greater than 0.7 between 860 Pa and 3860 Pa; and
(b) at least two media layers of a filter medium that is a wet laid medium comprising a pore size of 4 to 200 micrometers, a permeability of 50 to 800 ft-min−
1, a solidity of about 2 to 25% at 860 Pa, a basis weight of 20 to 120 g-m−
2, and a compressibility of about 0.5 to 1.0 between 860 Pa and 3860 Pa,(c) at least two media layers of a filter medium that is a wet laid medium comprising a pore size of 4 to 200 micrometers, a permeability of 1 to 1000 ft-min−
1, a solidity of about 2 to 25% at 860 Pa, a basis weight of 20 to 120 g-m2, and a compressibility of about 0.5 to 1 between 860 Pa and 3860 Pa,wherein the filter element is capable of filtering both solid and liquid particulates from a heavily loaded fluid stream.
1 Assignment
0 Petitions
Accused Products
Abstract
A filter element having multiple formed layers of filtration media is disclosed. The media are layered so as to form a pore size gradient. The filter element is capable of removing both solid and liquid particulates from a moving fluid stream. The filter element has high strength and compressibility. The layers can be supported on a porous or perforate support to provide mechanical stability during filtering operations. The filtration media layers can be formed into various filter element forms such as panels, cartridges, inserts, and the like.
495 Citations
44 Claims
-
1. A filter element comprising a layered composite of non-woven air laid and wet laid media, comprising at least three layers of a nonwoven filter media, the filter element comprising:
-
(a) An upstream media comprising at least two media layers of a first filter medium that is an air laid medium, the medium comprising 1 to 100 wt % of 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 50 to 100 micrometers, a permeability of 50 to 800 ft-min−
1, a solidity of about 2 to 25% at 860 Pa, a basis weight of 150 to 350 g-m−
2, and a compressibility of greater than 0.7 between 860 Pa and 3860 Pa; and(b) at least two media layers of a filter medium that is a wet laid medium comprising a pore size of 4 to 200 micrometers, a permeability of 50 to 800 ft-min−
1, a solidity of about 2 to 25% at 860 Pa, a basis weight of 20 to 120 g-m−
2, and a compressibility of about 0.5 to 1.0 between 860 Pa and 3860 Pa,(c) at least two media layers of a filter medium that is a wet laid medium comprising a pore size of 4 to 200 micrometers, a permeability of 1 to 1000 ft-min−
1, a solidity of about 2 to 25% at 860 Pa, a basis weight of 20 to 120 g-m2, and a compressibility of about 0.5 to 1 between 860 Pa and 3860 Pa,wherein the filter element is capable of filtering both solid and liquid particulates from a heavily loaded fluid stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
-
Specification