| 摘要 |
There is disclosed a plugged honeycomb structure which is excellent in each of a PM trapping performance, a crack resistance during recovery, and a manufacturing cost. A honeycomb structure 1 has porous partition walls 3 defining and forming a plurality of cells communicating between two end faces, and a circumferential wall 4 formed integrally with the partition walls 3. The cells include partial cells 5 positioned in an outermost circumferential portion of the honeycomb structure 1 and being partially in contact with the circumferential wall 4, and normal cells 6 other than the partial cells 5. As to the normal cells 6, a plugging portion 8 is formed in one end portion of each normal cell in such a plugging pattern that the two end faces of the honeycomb structure 1 show complementary checkered patterns, and as to the partial cells 5, in the partial cells 5 in which the plugging portion to be formed in one end portion thereof to follow the plugging pattern, the plugging portion is not formed in at least a part of a partial cell 5a in which an area ratio obtained by Equation (1) is smaller than 80%, and the partial cells 5b, which have an area ratio of 80% or more obtained by Equation (1), of 95% or more with respect to the number of all the partial cells each having 80% or more of the area ratio at which the plugging portion is to be formed in the one end portion thereof to follow the plugging pattern are provided with the plugging portions formed therein the area ratio % = an area of the partial cell / an area of the normal cell × 100 |
