Nonwoven fabric for filter and filter for engine
AssigneesKureha Corporation, Toyoda Boshoku Corporation
InventorHiroyuki Nakajima
Life of this patent
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Abstract
A nonwoven fabric for a filter excellent in cleaning efficiency and trapped matter retention volume is constructed by two or more different kinds of fibrous layers placed one over the other. The nonwoven fabric has an average pore size from 30 μm inclusive to 60 μm inclusive and a total pore area at 0.011 cm2/cm2 or more with respect to an entire surface of the nonwoven fabric. The average pore size is calculated according to a bubble point method as defined in ASTM F-316-80 with use of a Coulter Porometer II.
Claims15
A nonwoven fabric for a filter excellent in cleaning efficiency and trapped matter retention volume constructed by two or more different kinds of fibrous layers placed one over the other, the nonwoven fabric having an average pore size from 30 μm inclusive to 60 μm inclusive and a total pore area at 0.011 cm2/cm2 or more with respect to an entire surface of the nonwoven fabric, the average pore size being calculated according to a bubble point method as defined in ASTM F-316-80 with use of a Coulter Porometer II.
7 The nonwoven fabric for a filter according to claim 6, wherein the physical bonding is obtained by a needle punch processing or a water jet processing.
10 The process for manufacturing the nonwoven fabric according to claim 9, wherein each fibrous layer is composed of adhesive fibers and fibers to be adhered.
Dependencies are inferred from the claim text.