Nonwoven filter material
AssigneeMinnesota Mining and Manufacturing Company
InventorJohn C. Winters
Life of this patent
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Abstract
Improved microfibrous filtration laminate comprising a highly permeable layer of a self-supporting nonwoven fabric which provided support for a layer of a randomly intertangled nonwoven mat of electret-containing microfibers of synthetic polymers are disclosed. The filtration laminate, which is particularly useful as disposable filter bags or as a lining material for disposable paper filter bags for vacuum cleaners, is characterized by thickness and handling characteristics approaching that of paper filter material typically use in disposable vacuum clean bags but having improved performance in the areas of an immediate, high particle capture efficiency, minimal flow restriction and long service life.
Claims16
A disposable microfibrous filter material especially suited for use as a dust and debris collection device for vacuum cleaning apparatus, said microfibrous filter material comprising a laminate structure of a porous layer of self-supporting, thermoplastic, nonwoven fabric having an air permeability of at least 300 m.sup.3 /min/m.sup.2 and a layer of a randomly intertangled nonwoven mat of electretcontaining microfibers of synthetic polymer coextensively deposited directly on and adhering to said self-supporting nonwoven fabric, said laminate structure having an air permeability of from about 5 to 50 m.sup.3 /min/m.sup.2
Dependencies are inferred from the claim text.