Spunbond vacuum cleaner webs
AssigneeKimberly-Clark Worldwide, Inc.
InventorDavid Grant Midkiff
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Abstract
There is provided a vacuum cleaner filter medium which is a nonwoven spunbond web of conjugate spunbond fibers. The web has a Frazier permeability of at least 250 CFM, an NaCI efficiency of at least 65 percent, a Gurley Stiffness of at least 20 mg, and a pressure drop of 0.5 or less mm H.sub.2 O. The conjugate fibers are made from polymers, more particularly polyolefins, still more particularly polypropylene and polyethylene in a side-by-side configuration. The filter medium is treated by a hot-air knife and through-air bonded during the production process. The medium is also electret treated. The medium has sufficient stiffness to be converted into a filter by conventional techniques. While this invention is directed mainly to air purification and filtration, other gasses may be filtered as well.
Claims8
A filter for vacuum cleaners comprising a nonwoven web of spunbond conjugate fibers having a Frazier permeability of at least 250 CFM, an NaCI efficiency of at least 65 percent, a pressure drop of 0.5 or less mm H.sub.2 O, and a Gurley Stiffness of at least 20 mg, wherein said web has been subjected to hot air knife treatment.
A vacuum cleaner filter comprising a nonwoven web of crimped polypropylene/polyethylene side-by-side spunbond conjugate fibers having a basis weight between about 51 gsm and about 170 gsm and having a Frazier permeability of at least 250 CFM, an NaCI efficiency of at least 65 percent, a pressure drop of 0.5 or less mm H.sub.2 O, and a Gurley Stiffness of at least 20 mg, formed by a process wherein said web is subjected to hot air knife treatment, through-air bonding and electret treatment.
Dependencies are inferred from the claim text.