Filtration media having a slit-film layer
AssigneeTransweb, LLC
InventorKumar Ogale
Life of this patent
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Abstract
A composite filter media for a vacuum cleaner comprising a first filtration layer comprising a slit film having a plurality of continuous electrostatically-charged polyolefin filaments disposed substantially parallel to each other along their lengths; and a second filtration layer comprising a high-efficiency filtration media selected from wet-laid filter paper, dry-laid filter paper, and nonwoven filter media; wherein said first filtration layer is disposed in series with said second filtration layer, with respect to an air flow direction through said vacuum cleaner, to form a composite.
Claims23
A composite filter media for a vacuum cleaner comprising:
- a. a first filtration layer comprising an electrostatically-charged polyolefin slit-film formed from a plurality of continuous electrostatically-charged polyolefin filaments disposed substantially parallel to each other along their lengths;
- and
- b. a second filtration layer comprising a high-efficiency filtration media selected from wet-laid filter paper, dry-laid filter paper, and nonwoven filter media;
- wherein said first filtration layer is disposed in series with and upstream from said second filtration layer, with respect to an air flow direction through said vacuum cleaner, to form a composite.
A disposable vacuum cleaner filter comprising:
- a. an outer layer comprising a high-efficiency filtration media selected from wet-laid filter paper, dry-laid filter paper, and nonwoven filter media;
- and
- b. an inner layer comprising a slit film having a plurality of continuous electrostatically-charged polyolefin filaments disposed substantially parallel to each other, wherein at least a portion of said filaments are interconnected at two or more points along their length;
- wherein said outer layer is disposed peripherally to said inner layer and at least a portion of said outer later is bonded to said inner layer to form a composite filter material, and
- wherein said inner layer is disposed upstream of said outer layer with respect to an air flow direction through said vacuum cleaner filter.
A method for removing particulate matter entrained in a gas comprising:
- a. traversing gas entrained with particulate matter through a filter comprising:
- (i) a first layer comprising a slit film having a plurality of continuous electrostatically-charged polyolefin filaments disposed substantially parallel to each other along their lengths, wherein at least a portion of said filaments are interconnected at two or more points along their lengths;
- and (ii) a second filtration layer comprising a high-efficiency filtration material selected from wet-laid filter paper, dry-laid filter paper, and nonwoven filter media;
- wherein said first filtration layer is disposed upstream of said second filtration layer with respect to the direction of said traversal;
- and
- b. removing at least a portion of said particulate matter from said gas.
Dependencies are inferred from the claim text.