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US 5,665,235 AGranted
Supported fibrous web assembly
AssigneePall Corporation
InventorsMichael R. Gildersleeve, Tony Alex, Thomas C. Gsell, M. JoAnna Abes
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AssigneePall Corporation
InventorsMichael R. Gildersleeve, Tony Alex, Thomas C. Gsell, M. JoAnna Abes
Estimating the term…
The present invention provides a supported fibrous web assembly comprising a support material adhered to a nonwoven web of multicomponent fibers comprising a first polymer and a second polymer such that the second polymer is present on at least a portion of the surface of the multicomponent fibers and has a softening temperature below the softening temperatures of the first polymer and the support material, wherein the supported fibrous web assembly has a water flow rate of at least about 20% of the water flow rate of the nonwoven web of multicomponent fibers alone. The present inventive supported fibrous web assembly can further comprise a second fibrous web, which is adhered to the nonwoven web of multicomponent fibers such that the nonwoven web of multicomponent fibers is positioned between the second fibrous web and the support material, and wherein the supported fibrous web assembly has a water flow rate of at least about 20% of the water flow rate of the second fibrous web alone. The present invention also provides a filter element comprising a housing and such a supported fibrous web assembly, as well as a method of preparing such a supported fibrous web assembly and methods of using such a supported fibrous web assembly.
A supported fibrous web assembly comprising (a) a support material, (b) a first fibrous web, and (c) a second fibrous web, wherein said first fibrous web is positioned between and adhered to said support material and said second fibrous web, said first fibrous web is a nonwoven web of multicomponent fibers comprising at least about 10 wt. % of a first polymer and no more than about 90 wt. % of a second polymer such that said second polymer is present on at least a portion of the surface of said multicomponent fibers and has a softening temperature below the softening temperatures of said first polymer, second fibrous web and support material, said supported fibrous web assembly has a water flow rate of at least about 20% of the water flow rate of said second fibrous web alone, and the peel strengths as between said first fibrous web and said support material and as between said first fibrous web and said second fibrous web are at least about 50 kg/m.
A method of preparing a supported fibrous web assembly, wherein said method comprises (a) positioning a first fibrous web in contact with and between a support material and a second fibrous web to form a supported fibrous web assembly, wherein said first fibrous web is a nonwoven web of multicomponent fibers comprising at least about 10 wt. % of a first polymer and no more than about 90 wt. % of a second polymer such that said second polymer is present on at least a portion of the surface of said multicomponent fibers and has a softening temperature below the softening temperatures of said first polymer, second fibrous web and support material, (b) subjecting said first fibrous web to a temperature above the softening temperature of said second polymer and below the softening temperatures of said first polymer, second fibrous web and support material, and (c) applying pressure to said supported fibrous web assembly, while said first fibrous web is at a temperature above the softening temperature of said second polymer such that said support material and said second fibrous web are adhered to said first fibrous web, and wherein said supported fibrous web assembly has a water flow rate of at least about 20% of the water flow rate of said second fibrous web alone and peel strengths as between said first fibrous web and said support material and as between said first fibrous web and said second fibrous web of at least about 50 kg/m.
Dependencies are inferred from the claim text.