| 摘要 |
<p>There is disclosed a plugged honeycomb structure which can collect particulate matter in large amounts and in which an increase of a pressure loss is suppressed. The plugged honeycomb structure includes a honeycomb structure section having porous partition walls 5 with which a plurality of cells 4 are formed to become through channels of a fluid, the plurality of cells 4 including the cells 4 having different open areas in a cross section perpendicular to an extending direction of the cells 4; inflow side plugged portions 8a arranged in inflow side end portions of the predetermined cells; and outflow side plugged portions arranged in outflow side end portions of the remaining cells. Outflow cells 4b which are the cells provided with the inflow side plugged portions 8a and inflow cells 4a which are the cells provided with the outflow side plugged portions are alternately formed via the partition walls 5, and in a central portion of the honeycomb structure section, the open area of each of the inflow cells 4a is larger than the open area of each of the outflow cells 4b. A difference in open area between the outflow cell 4b and the inflow cell 4a in an outer peripheral portion of the honeycomb structure section is smaller than a difference in open area between the outflow cell 4b and the inflow cell 4a in the central portion of the honeycomb structure section.</p> |
