| 摘要 |
PURPOSE:To obtain a filter having high capacity for propagating combustion by incorporating a fixed proportion of combustible material having a fixed particle size to a clogging material which cloggs an introducing passage. CONSTITUTION:In the prepn. of a cleaning filter for collecting fine particles by sintering a honeycomb-shaped molded body consisting mainly of ceramic powder and a clogging material for clogging the passage of said molded body and consisting mainly of the ceramic powder, a combustible material is incorporated to at least a clogging material for clogging the openings at one end of the passage serving as introducing passages, of the molded body. Any combustible material which is combustible at below the calcination temp. of the ceramic powder, such as resin, rubber, may be useful. Suitable mean particle size of the combustible material is 50-700mum, and the combustible material is incorporated in a proportion of 1/3-3 times by volume basing on the amt. of the ceramic powder 1 to be contained in said clogging material. By this method, permeability for gas is imparted to the clogging material, and a filter having superior combustion propagating characteristic is obtd.
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