PURPOSE: To obtain a filter which is washed with an alkaline cleaner and has high oil droplet adhesion performance by filling a gas permeable vessel with an alkali-resistant inorganic particles.
CONSTITUTION: Gas permeable vessels formed by alkali-resistant metal 6, 7 are filled with alkali-resistant inorganic particles 5. The alkali-resistant inorganic particles 5 are alumina, zeolite, etc., formed into granules, excel in oil holding performance, have high lipophilic property and is suitable for the adsorption of soot. And since the inorganic particles have high alkali-resistant performance, they are reused if the inorganic particles on which oil is stuck are washed with alkaline water solution in several times. Besides, the opening rate of the gas permeable vessels 6, 7 is ≥60-70% and the section on the soot source side of a filter 3 is formed into uneven surface, such as corrugated-shape, chevron, etc. Thereby a soot passing surface is made large to keep pressure loss small.
Shimazaki Sho
Takao Kawai
Yasuhiro Nagai
