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AssigneeHitachi Metals, Ltd.
InventorsShunji Okazaki, Yasuhiko Otsubo, Shinya Tokumaru, Hirohisa Suwabe, Toshitake Ishizawa
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A method for producing a honeycomb filter from a honeycomb structure having large numbers of flow paths partitioned by cell walls, comprising inserting a tubular member into each of the flow paths, and injecting a plugging material into each of the flow paths from the tubular member to form a plug in each of the flow paths at a position separate from the end surface of the honeycomb structure, the tubular member having an outer diameter that is 40-90% of the opening size of the flow path, the plugging material comprising at least a ceramic material having a maximum particle size that is 85% or less of the inner diameter of the tubular member, and an average particle size of 1 μm or more.
A method for producing a honeycomb filter from a honeycomb structure having large numbers of flow paths partitioned by cell walls, comprising inserting a tubular member into each of said flow paths, and injecting a plugging material into each of said flow paths from said tubular member to form a plug in each of said flow paths at a position separate from the end surface of said honeycomb structure, said tubular member having an outer diameter that is 40-90% of the opening size of said flow path, said plugging material comprising at least a ceramic material having a maximum particle size that is 85% or less of the inner diameter of said tubular member, and an average particle size of 1 μm or more.
A honeycomb filter comprising a honeycomb structure having large numbers of flow paths partitioned by cell walls, and at least plugs formed in pluralities of said flow paths at positions separate from the end surface of said honeycomb structure, the distance between said plugs and said end surface being not uniform.
A honeycomb filter comprising a honeycomb structure having large numbers of flow paths partitioned by cell walls, and at least plugs formed in said flow paths at positions separate from the end surface of said honeycomb structure, pluralities of plugs being formed in the same flow paths.
A honeycomb filter comprising a porous ceramic honeycomb structure, desired flow paths of which are plugged such that an exhaust gas passes through cell walls of the honeycomb structure, wherein it has exhaust-gas-inlet-side plugs separate from an exhaust-gas-inlet-side end surface, wherein the porosity of said cell walls is 40-80%, and wherein the porosity of said exhaust-gas-inlet-side plugs is smaller than that of said cell walls.
A honeycomb filter comprising a porous ceramic honeycomb structure, desired flow paths of which are plugged such that an exhaust gas passes through cell walls of the honeycomb structure, wherein it has exhaust-gas-inlet-side plugs separate from an exhaust-gas-inlet-side end surface, and wherein both end surfaces of said exhaust-gas-inlet-side plugs are recessed.
Dependencies are inferred from the claim text.