Production method of ceramic honeycomb filter

Abstract

A method for producing a ceramic honeycomb filter having predetermined plugs comprising immersing the end portions of a ceramic honeycomb structure having large numbers of flow paths, with its end surface covered with a mask provided with holes only at positions corresponding to the predetermined flow paths, in a plugging material slurry, so that the plugging material slurry is introduced into the end portions of the predetermined flow paths, and removing plugging material protrusions formed in the flow paths that should not be plugged.

1 . A method for producing a ceramic honeycomb filter having predetermined plugs comprising immersing the end portions of a ceramic honeycomb structure having large numbers of flow paths, with its end surface covered with a mask provided with holes only at positions corresponding to the predetermined flow paths, in a plugging material slurry, so that said plugging material slurry is introduced into the end portions of the predetermined flow paths, and removing plugging material protrusions formed in the flow paths that should not be plugged. 
   
   
       2 . The method for producing a ceramic honeycomb filter according to  claim 1 , wherein said plugging material protrusions are removed before burning said plugs. 
   
   
       3 . The method for producing a ceramic honeycomb filter according to  claim 1 , wherein the end portions of said ceramic honeycomb filter are cut off to remove said plugging material protrusions. 
   
   
       4 . The method for producing a ceramic honeycomb filter according to  claim 1 , wherein a high-pressure gas is blown to an end surface of said ceramic honeycomb filter to remove said plugging material protrusions. 
   
   
       5 . The method for producing a ceramic honeycomb filter according to  claim 1 , wherein a protrusions-removing means is moved in a flow path in which said plugging material protrusions are formed, to remove said plugging material protrusions. 
   
   
       6 . The method for producing a ceramic honeycomb filter according to  claim 5 , wherein said protrusions-removing means is an elastic member. 
   
   
       7 . The method for producing a ceramic honeycomb filter according to  claim 6 , wherein said protrusions-removing means is a brush comprising twisted wires, and large numbers of elastic filaments held by the twisted wires.