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US 5,672,188 AGranted
High capacity filter media
AssigneeAAF International
InventorKyung-Ju Choi
Life of this patent
Estimating the term…
Abstract
A fluid filter arrangement including layered filter media capable of successively filtering varying sized particulate matter from a treated fluid stream with each layer of the layered filter media having a substantially equal terminal pressure drop thereacross.
Claims19
A composite filter arrangement of fibrous layers of filter media for removing particulate matter from a fluid stream comprising:
- an upstream first layer having upstream and downstream faces of a mixture of preselected fiber filter media components, said first upstream layer being of preselected thickness with said fiber components being of preselected fiber diameter to provide a first preselected fluid permeability and;
- at least a second successive intermediate layer of polymeric fibers of filter media of preselected thickness and fiber diameter to provide a second preselected fluid permeability, each of said layers having a substantially equal terminal pressure drop thereacross.
A composite filter arrangement of fibrous layers of filter media for removing particulate matter from a fluid stream comprising:
- an upstream first layer of an air laid mixture of cotton and polyester fiber filter media with said cotton fibers having diameters in the approximate range of ten to twenty eight micrometers (10-28 um) and said polyester fibers having diameters in the approximate range of five to sixteen micrometers (5-16 um), said first upstream layer having an approximate thickness of zero point one two five inches (0.125"), a basis approximate weight of two point five ounces per square yard (2.5 oz/sq.yd.), and an approximate air permeability of five hundred cubic feet per minute per square foot (500 CFM/sq.ft.) with a binder of ethylene vinyl chloride applied to opposite faces thereof;
- a facing second layer of melt blown polymeric fibers having an approximate thickness of zero point zero zero six inches (0.006"), an approximate basis weight of zero point three two ounces per square yard (0.32 oz/yd.sup.2) with fiber diameters in the approximate range of one to thirteen micrometers (1-13 um) with an average fiber being of approximately six micrometers (6 um) in diameter and with the second layer having an approximate air permeability of nine hundred cubic feet per minute per square foot (900 CFM/sq.ft.);
- and, a facing third layer of melt blown polymeric fibers also having an approximate thickness of zero point zero zero six inches (0.006"), with an approximate basis weight of zero point two four ounces per square yard (0.24 oz/yd.sup.2) with fiber diameters in the approximate range of one to ten micrometers (1-10 um) with an average of the fibers being of approximately five micrometers (5 um) diameter and with the third layer having approximate air permeability of seven hundred cubic feet per minute per square foot (700 CFM/sq.ft.);
- the second layer of filter media having more ropings (Strand clusters) than said third layer and with said first, second and third layers having substantially equal terminal pressure drops thereacross.
1 more element
Dependencies are inferred from the claim text.