FILTRATION MEDIA HAVING A SLIT-FILM LAYER
First Claim
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1. A composite filter media for a vacuum cleaner comprising:
- a. a first filtration layer comprising an electrostatically-charged polyolefin slit-film; 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 said second filtration layer, with respect to an air flow direction through said vacuum cleaner, to form a composite.
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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.
43 Citations
26 Claims
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1. A composite filter media for a vacuum cleaner comprising:
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a. a first filtration layer comprising an electrostatically-charged polyolefin slit-film; 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 said second filtration layer, with respect to an air flow direction through said vacuum cleaner, to form a composite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A disposable vacuum cleaner filter comprising:
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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. - View Dependent Claims (24)
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25. A method for removing particulate matter entrained in a gas comprising:
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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; andb. removing at least a portion of said particulate matter from said gas.
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26. A composite filter media for a vacuum cleaner prepared by a process comprising the steps of:
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a. providing a polyolefin film; b. slitting said film to form a single layer of filaments that are substantially parallel along their lengths, wherein at least a portion of said filaments are interconnected at two or more points along their lengths; and c. bonding at least a portion of said filaments to a high-efficiency filtration material to form a composite, wherein said high-efficiency filtration material is selected from wet-laid filter paper, dry-laid filter paper, and nonwoven filter media.
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Specification