| abstract |
PROBLEM TO BE SOLVED: To suppress an initial pressure loss, and the rate of increase in pressure loss that rises as particulates accumulate is low, so that the pressure loss when a specified amount of particulates is collected becomes low, Provided is a filter having a low pressure loss when the total period is viewed. SOLUTION: A columnar filter having a honeycomb structure in which a large number of through holes are arranged in parallel in the longitudinal direction across a wall portion, and the through holes have a relatively large cross-sectional area perpendicular to the longitudinal direction. It consists of two types of through-holes, which are substantially the same number of large-volume through-holes and small-volume through-holes having a relatively small cross-sectional area, and the large-volume through holes are sealed at one end of the filter On the other hand, the small volume through hole is sealed at the other end of the filter, and the one large volume through hole has a wall portion shared with the adjacent large volume through hole. [Selection] Figure 6 |