Filter plug
AssigneesMitsubishi Acetate Co., Ltd., Mitsubishi Rayon Co., Ltd.
InventorsKazuhiko Morifuji, Hirohumi Okura, Takashi Sakai
Life of this patent
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Abstract
A filter plug having a dual structure comprising filter element A made from a crimped long filter tow in a form of a plug, filter element B, joined to said A, prepared by wrapping a core material consisting of a long fiber tow in a sheet-formed product having grooves which is formed from a material having an air permeability of 8 liters/minute or less and an air permeable wrapping paper and/or a wrapping paper with perforated openings on its periphery which is wrapping therein said filter elements A and B so that the outer grooves parts of the sheet-formed product pass through in the longer direction of the filter plug.
Claims9
A cylindrical filter plug having an axial core of filter material and an outer skin of wrapping paper which permits air to pass therethrough,
- the core comprising a first filter element and a second filter element axially arranged and jointed to each other, the first filter element comprising a crimped long fiber tow, the second filter element comprising a core of long fiber tow peripherally surrounded by a corrugated sheet having grooves extending in the longitudinal direction of the filter plugs, the corrugated sheet having an air permeability of 0.005 to 8 liters/minute.
A cylindrical filter plug having an axial core of filter material and an outer skin of wrapping paper which permits air to pass therethrough,
- the core comprising a first filter element and a second filter element axially arranged and joined to each other, the first filter element comprising a crimped long fiber tow, the second filter element comprising a core of long fiber tow peripherally surrounded by a corrugated sheet having grooves extending in the longitudinal direction of the filter plugs.
A cylindrical filter plug having an axial core of filter material and an outer skin of wrapping paper which permits air to pass therethrough,
- the core comprising a first filter element and a second filter element axially arranged and joined together, the first filter element comprising a crimped long fiber tow, the second filter element comprising a core of long fiber tow peripherally surrounded by a corrugated sheet having grooves extending in the longitudinal direction of the filter plugs, the corrugated sheet having an air permeability sufficient to pass air therethrough and .ltoreq.8 liters/minute.
Dependencies are inferred from the claim text.