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A method for producing a cordierite-based ceramic honeycomb filter comprising the steps of introducing a plugging material of a cordierite-forming material into predetermined flow paths of a sintered, cordierite-based ceramic honeycomb having an outer diameter of 150 mm or more, and drying and sinte

A method for producing a cordierite-based ceramic honeycomb filter comprising the steps of introducing a plugging material of a cordierite-forming material into predetermined flow paths of a sintered, cordierite-based ceramic honeycomb having an outer diameter of 150 mm or more, and drying and sintering the resultant plugs, the sintering step comprising a temperature-elevating process, a temperature-keeping process and a temperature-lowering process, and the temperature-elevating process having a temperature-elevating speed of 70-500° C./hr from 800° C. to the highest keeping temperature.

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1. A method for producing a cordierite-based ceramic honeycomb filter comprising the steps of introducing a plugging material into predetermined flow paths of a sintered, cordierite-based ceramic honeycomb having an outer diameter of 150 mm or more, and drying and sintering the resultant plugs, said

1. A method for producing a cordierite-based ceramic honeycomb filter comprising the steps of introducing a plugging material into predetermined flow paths of a sintered, cordierite-based ceramic honeycomb having an outer diameter of 150 mm or more, and drying and sintering the resultant plugs, said sintering step comprising a temperature-elevating process, a temperature-keeping process and a temperature-lowering process, and said temperature-elevating process having a temperature-elevating speed of 100-500° C./hr from 800° C. to the highest keeping temperature, wherein said plugging material consists essentially of cordierite-forming materials, a binder, a lubricant and water, and wherein said cordierite-forming materials contain 5-22% by mass of silica having an average particle size of 10-25 μm, and wherein said plugs are heated faster in a portion near a cell wall than in an inside portion distant from said cell wall. 2. The method for producing a cordierite-based ceramic honeycomb filter according to claim 1, wherein said temperature-lowering process has a temperature-lowering speed of 30-400° C./hr from the highest keeping temperature to 800° C. 3. The method for producing a cordierite-based ceramic honeycomb filter according to claim 1, wherein said sintering is conducted in a continuous furnace. 4. The method for producing a cordierite-based ceramic honeycomb filter according to claim 3, wherein said continuous furnace is a roller heath type. 5. The method for producing a cordierite-based ceramic honeycomb filter according to claim 1, wherein said temperature-elevating process has a temperature-elevating speed of 150-300° C./hr from 800° C. to the highest keeping temperature. 6. The method for producing a cordierite-based ceramic honeycomb filter according to claim 1, wherein said plugging material is sintered to a cell wall before shrinking. 7. The method for producing a cordierite-based ceramic honeycomb filter according to claim 1, wherein said highest keeping temperature is in the range of 1350-1450° C.