| 摘要 |
There is disclosed a plugged honeycomb structure which does not decrease an area of a filter layer or does not increase the total length thereof, but can suppress the deposition of soot at ends of plugged portions on an inlet end surface side or the generation of end-surface cracks on an outlet end surface side during regeneration, when the structure is used as a filter such as a DPF. A plugged honeycomb structure 1 includes a honeycomb structured body where a plurality of cells communicating between an inlet end surface and an outlet end surface are partitioned by porous partition walls; and plugged portions to plug open frontal areas of the predetermined cells on the side of the inlet end surface and open frontal areas of the remaining cells on the side of the outlet end surface. The plugged portions are formed by charging the cells with a constituent material of the plugged portions, followed by firing, and in a region A having a width of at least 20 mm from an outer periphery of each of the inlet end surface and the outlet end surface, a smoothing treatment by end-surface polishing is performed so that a depth of a recess portion generated at an end of each of the plugged portions during the firing becomes small. |
