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US 6,428,610 B1Granted
Hepa filter
AssigneeThe University of Tennessee Research Corporation
InventorsPeter Tsai, Sanjiv R. Malkan
Life of this patent
Estimating the term…
Abstract
The present invention is directed toward a filter media for a high efficiency particulate air (“HEPA”) filter including a multiplicity of adjacent electrostatically charged piles of nonwoven fabric. The invention further includes a method of making a HEPA filter.
Claims20
A particulate air filter media comprising:
- a. a first pile of charged nonwoven fabric having a weight in the range of 5-40 grams per square meter and one or more fibers having a diameter in the range of 1.5-2.0 microns;
- b. a second pile of nonwoven fabric having a weight in the range of 5-40 grams per square meter and one or more fibers having a diameter in the range of 1.5-2.0 microns, adjacent to said first pile;
- c. a third pile of nonwoven fabric having a weight in the range of 5-40 grams per square meter and one or more fibers having a diameter in the range of 1.5-2.0 microns, adjacent to said second pile;
- and
- d. a stiffening layer bonded to one of said piles.
2 more elements
A particulate air filter comprising:
- a. at least three adjacent piles of charged nonwoven fabric, each of said piles having a weight in the range of 5-40 grams per square meter and comprising one or more fibers having a diameter in the range of 1.5-2.0 microns, said piles comprising a first outer surface and a second outer surface;
- and
- b. a first stiffening layer bonded to said first outer surface such that the bonding area is in the range of 0.1-30% of the surface area of said first outer surface.
A method of making a particulate air filter comprising:
- a. charging at least three adjacent piles of nonwoven fabric, each of said piles having a weight in the range of 5-40 grams per square meter, and each of said piles comprising one or more fibers having a diameter in the range of 1.5-2.0 microns;
- b. collating a stiffening layer of fabric with said piles;
- c. bonding the stiffening layer to one of said piles to form a stiffened filter media having a top side and a bottom side;
- d. scoring said stiffened filter media;
- e. folding said stiffened filter media into a multiplicity of adjacent layers;
- and
- f. inserting a separator between two adjacent layers.
4 more elements
A method of making a particulate air filter comprising:
- a. charging at least three adjacent piles of nonwoven fabric, each of said piles having a weight in the range of 5-40 grams per square meter, and each of said piles comprising one or more fibers having a diameter in the range of 1.5-2.0 microns;
- b. collating a stiffening layer with said piles;
- c. bonding the stiffening layer of fabric to one of said piles to form a stiffened filter media having a top side and a bottom side;
- d. scoring said stiffened filter media;
- e. applying glue to a side of said stiffened filter media;
- f. folding said filter media into a series of V shaped pleats;
- and
- g. cutting said pleated filter media into a multiplicity of pieces having a predetermined size.
5 more elements
Dependencies are inferred from the claim text.