Honeycomb filter for exhaust gas decontamination and exhaust gas decontamination apparatus
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United States of America Patent
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Sep 23, 2008
Grant Date -
Jul 28, 2005
app pub date -
Mar 4, 2003
filing date -
Mar 4, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A honeycomb filter for purifying exhaust gases that can almost completely burn and remove particulates accumulated on a wall portion by a regenerating process allowing residual ashes on the wall portion to easily move inside a through hole because the ashes are easily separated from the wall portion. In the honeycomb filter a columnar body made of porous ceramics, having parallel through holes in the length direction with a wall portion interposed therebetween, is designed so that part or all of the wall portion that separates the through holes from each other functions as a filter collecting particulates, wherein a length 1 of the longest side in a cross section perpendicular to the length direction of the through hole and a length L in the length direction of the columnar body satisfy: 60.ltoreq.L/1.ltoreq.500 and a surface roughness Ra (according to JIS B 0601) of the through hole inner wall satisfies: Ra.ltoreq.100 .mu.m
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