Cylindrical filter
AssigneeChisso Corporation
InventorsSatoshi Ogata, Shinichi Tokudome
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Abstract
A cylindrical filter is disclosed which comprises a wound up layer of a fibrous aggregate comprising melt-adhesive composite fibers bonded each other through the melt of a melt-adhesive component in the composite fibers and a layer of non-woven fabric of glass fibers, the layer of non-woven fabric is arranged on the outer surface of the wound up layer of the fibrous aggregate, and glass fibers have a smaller diameter than that of the melt-adhesive composite fibers. The cylindrical filter has an excellent filter rating and filter life.
Claims7
A cylindrical filter comprising a wound up innermost layer, an outermost layer, each of said layers comprising a fibrous aggregate of melt-adhesive composite fibers bonded to each other through the melt of a melt-adhesive component in said composite fibers, and a layer of a non-woven fabric of glass fibers, said layer of the non-woven fabric of glass fibers being arranged between said innermost layer and said outermost layer and circumferentially wound up at a position of 1/3 to 4/5 in a thickness direction from an inner surface of said cylindrical filter, having a porosity of 96% or greater, and occupying 10 to 50% of the thickness of said cylindrical filter, and said glass fibers having a smaller diameter than that of said melt-adhesive composite fibers.
A cylindrical filter comprising:
- an innermost layer including a fibrous aggregate of melt-adhesive composite fibers;
- a layer of non-woven fabric of glass fibers wound around the innermost layer, said glass fibers having a diameter of approximately 3 .mu.m or smaller, and said layer of non-woven fabric having a porosity of 96% or greater;
- and
- an outermost layer including a fibrous aggregate of melt-adhesive composite fibers wound around the layer of non-woven fabric.
Dependencies are inferred from the claim text.