Filter media and structure
First Claim
Patent Images
1. A filter medium comprising:
- two layers, the layers consisting essentially of,a loading layer adjacent to an efficiency layer, the efficiency layer having a mean flow pore size smaller than the loading layer, the loading layer consisting essentially of a blend of;
about 5% to 50 wt % of a bicomponent binder fiber,about 50 to 95 wt % of a media fiber consisting of a glass fiber, andabout 0.5 to 25 wt % of a binder resin,wherein the loading layer has a basis weight of about 30 to 250 g-m−
2 andwherein the loading layer provides a permeability of 10 to 40 ft-min−
1, and a wet bursting strength of 5 to 50 lb-in−
2, inclusive; and
the efficiency layer consisting essentially of a blend of,about 5% to 50 wt % of a bicomponent binder fiber,about 50 to 95 wt % of a media fiber consisting of a glass fiber, andabout 0.5 to 25 wt % of a binder resin,wherein the efficiency layer has a basis weight of about 30 to 250 g-m−
2 andwherein the efficiency layer provides a permeability of 10 to 40 ft-min−
1, and a wet bursting strength of 5 to 50 lb-in−
2, inclusive.
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Abstract
In the filtration of fluid materials, the removal of particulate from the moving stream requires substantial pressure to maintain flow and substantial capacity for removing particulate. The filters of the invention are rugged, high wet strength materials having a basis weight, permeability and efficiency suitable to obtain substantial reduction in particulate loading from liquid streams without plugging or mechanical failure. In particular, the filters of the invention permit the removal of substantial proportions of particulate from non-aqueous streams including lubricant oils, hydraulic fluids and other contaminated streams.
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Citations
33 Claims
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1. A filter medium comprising:
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two layers, the layers consisting essentially of, a loading layer adjacent to an efficiency layer, the efficiency layer having a mean flow pore size smaller than the loading layer, the loading layer consisting essentially of a blend of; about 5% to 50 wt % of a bicomponent binder fiber, about 50 to 95 wt % of a media fiber consisting of a glass fiber, and about 0.5 to 25 wt % of a binder resin, wherein the loading layer has a basis weight of about 30 to 250 g-m−
2 andwherein the loading layer provides a permeability of 10 to 40 ft-min−
1, and a wet bursting strength of 5 to 50 lb-in−
2, inclusive; andthe efficiency layer consisting essentially of a blend of, about 5% to 50 wt % of a bicomponent binder fiber, about 50 to 95 wt % of a media fiber consisting of a glass fiber, and about 0.5 to 25 wt % of a binder resin, wherein the efficiency layer has a basis weight of about 30 to 250 g-m−
2 andwherein the efficiency layer provides a permeability of 10 to 40 ft-min−
1, and a wet bursting strength of 5 to 50 lb-in−
2, inclusive. - 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)
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24. A filter loading medium consisting essentially of a medium and an optional support, the medium being a blend of:
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about 1 to 15 wt % of a bicomponent binder fiber; about 50 to 90 wt % consisting of a glass fiber; and about 0.5 to 25 wt % of a latex resin, the bicomponent binder fiber, the glass fiber, and the latex resin have a basis weight of about 25 to 75 g-m−
2, andwherein the bicomponent binder fiber, the glass fiber, and the latex resin provide a permeability of 90 to 160 ft-min−
1, and a wet bursting strength of 5 to 50 lb-in−
2, inclusive. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification