Sealed honeycomb structure and method of producing the same

Abstract

There is disclosed a plugged honeycomb structure 1 having: partition walls 2 arranged in such a manner as to form a plurality of cells 3 extending from one end face 42 to the other end face 44 through an axial direction; an outer peripheral wall 7 which surrounds an outer periphery of the partition wall 2; and plugging portions 4a, 4b disposed in such a manner as to plug the cell 3 in either end face 42, 44. In the plugged honeycomb structure 1, at least some of plugging portions 4a arranged in at least the vicinity of the outer peripheral wall protrude from the end face 42 or 44. Alternatively, there are provided a plugged honeycomb structure 1 in which a tip of the protruding portion 4a is substantially flat or has a moderate curved face, and a method of manufacturing the structure. The plugged honeycomb structure 1 does not easily break, is capable of enhancing durability, and is preferably usable in a filter such as a diesel particulate filter (DPF).

Description

Technical field [0001] The present invention relates to a hole plugging honeycomb structure and a manufacturing method thereof, and in particular to a hole plugging part that is not easy to be damaged and can improve durability, and can be preferably used for filters such as DPF (diesel particulate filter) The hole plugging honeycomb structure and its manufacturing method. Background technique [0002] When the honeycomb structure is used in filters such as DPF, it is generally used in the form of the following hole plugging honeycomb structure 1 as shown in Figure 11 (a) to (c), which has: arranged to form a plurality of slaves The porous partition wall 2 of the small chamber 3 through which one end surface 42 to the other end surface 44 penetrates in the axial direction; the outer peripheral wall 7 surrounding the outer periphery of the partition wall 2; By designing in this manner, the fluid to be treated flowing into the cell from one end surface 42 passes through the porous ...

AI Technical Summary

Problems solved by technology

[0007] Moreover, since the fixing member 22 covers the opening of the small chamber near the outer peripheral wall, the small chamber near the outer peripheral wall does not have the fluid to be treated to flow in, so that it cannot function as a filter, and the pressure loss increases.

In addition, the small chamber near the outer peripheral wall does not flow into the high-temperature treated fluid, so there is a temperature difference between the inner small chamber into which the high-temperature treated fluid flows, and cracks caused by thermal shock are also prone to occur.

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