Patent ID: 7393377
Filing Date: 2008-07-01
Classification: B01D,C04B,F01N,Y02T,Y10S,Y10T

Abstract:
1. A honeycomb filter comprising: porous partition walls which partition/form a plurality of cells constituting channels of a fluid, a predetermined cell whose one end portion is opened and whose other end portion is plugged, and a remaining cell whose one end portion is plugged and whose other end portion is opened, the predetermined cell and the remaining cell being alternately arranged, and the honeycomb filter being capable of allowing the fluid that has flowed in from the one end portion in which the predetermined cell opens to flow out as a passed fluid into the remaining cell through the partition walls, and discharging the passed fluid from the other end portion in which the remaining cell opens, wherein a sectional area of the predetermined cell is different from that of the remaining cell in a section cut along a flat face vertical to a longitudinal direction of the cell, a value of a ratio of a channel hydraulic diameter of the cell having a large sectional area to that of the cell having a small sectional area is from 1.2 to 1.5, at least a sectional shape of the cell having the large sectional area is a quadrangular shape whose portion corresponding to at least one corner portion is circular, and a value of a ratio of minimum thickness of a portion (intersection portion) in which the partition walls cross one another to a thickness of each partition wall is 0.7 or more and less than 1.3.