Nonwoven filter media for gas
AssigneeKimberly-Clark Corporation
InventorsRichard D. Pike, Richard M. Peterson
Life of this patent
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Abstract
The present invention provides a filter medium, which contains an electretized nonwoven web of crimped fibers selected from the group consisting of spunbond filaments and staple fibers, wherein the nonwoven web has a Frazier permeability equal to or greater than about 100 ft.sup.3 /min/ft.sup.2 and a density between about 0.01 g/cm.sup.3 and about 0.095 g/cm.sup.3.
Claims26
A filter medium comprising an electretized nonwoven web of crimped fibers selected from the group consisting of spunbond filaments and staple fibers, wherein said nonwoven web has a Frazier permeability equal to or greater than about 100 ft.sup.3 /min/ft.sup.2 and a density between about 0.01 g/cm.sup.3 and about 0.095 g/cm.sup.3, and wherein said crimped fibers are crimped before they are formed into said nonwoven web and have a crimp level of at least 2 crimps per extended inch, as measured in accordance with ASTM D3937-82.
A filter medium comprising an electretized nonwoven web of crimped conjugate fibers selected from the group consisting of spunbond filaments and staple fibers, wherein said nonwoven web has a Frazier permeability equal to or greater than about 100 ft.sup.3 /min/ft.sup.2 and a density between about 0.01 g/cm.sup.3 and about 0.095 g/cm.sup.3, and wherein said crimped fibers are crimped before they are formed into said nonwoven web and have a crimp level of at least 2 crimps per extended inch, as measured in accordance with ASTM D3937-82.
A fluid filter medium comprising an electretized nonwoven web of crimped conjugate spunbond filaments, wherein said nonwoven web has a Frazier permeability equal to or greater than about 100 ft.sup.3 /min/ft.sup.2 and a density between about 0.01 g/cm.sup.3 and about 0.095 g/cm.sup.3, and wherein said crimped filaments are crimped before they are formed into said nonwoven web and have a crimp level of at least 2 crimps per extended inch, as measured in accordance with ASTM D3937-82.
Dependencies are inferred from the claim text.