Patent ID: 11872527
Assignee: NGK INSULATORS, LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A honeycomb filter comprising: a pillar-shaped honeycomb structure having an inflow end face and an outflow end face and comprising a porous partition wall disposed so as to surround a plurality of cells, the plurality of cells extending from the inflow end face to the outflow end face and serving as a through channel of fluid;
inflow side plugging portions disposed at open ends of predetermined cells of the plurality of cells on the inflow end face side; and
outflow side plugging portions disposed at open ends of residual cells other than the predetermined cells of the plurality of cells on the outflow end face side,
wherein
the outflow side plugging portions comprise first outflow side plugging portions and second outflow side plugging portions,
let that a length of the honeycomb structure from the inflow end face to the outflow end face is an overall length L0,
a length of the first outflow side plugging portions from the outflow end face is a plugging length L1, and
a length of the second outflow side plugging portions from the outflow end face is a plugging length L2,
the plugging length L1 of the first outflow side plugging portions is 10 to 50% of the overall length L0 of the honeycomb structure, and
the plugging length L2 of the second outflow side plugging portions is less than 10% of the overall length L0 of the honeycomb structure.