Method for producing plugged honeycomb structure

Patent metadata

Field	Value
Publication number	US-10124508-B2
Application number	US-201615264843-A
Country	US
Kind code	B2
Filing date	Sep 14, 2016
Priority date	Mar 27, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

The present invention includes recognizing, as positions of outermost circumferential cells, positions each of which is calculated from an average cell pitch of usual cells and each of which is present on an inner side from a circumference of an end face of a honeycomb structure; disposing, on the basis of the recognition, virtual perforation regions at positions on a sheet which correspond to the outermost circumferential cells to be plugged, each of the virtual perforation regions being divided into a plurality of squares; and performing perforation processing of perforating at least one of a plurality of squares in each of the virtual perforation regions. Positions and a number of squares to be perforated in each of the virtual perforation regions are individually set in accordance with each of the positions of the outermost circumferential cells to be plugged to which each of the virtual perforation regions corresponds.

First claim

The invention claimed is:

1. A method for producing a plugged honeycomb structure including a honeycomb structure in which a porous partition wall defines and forms a plurality of cells communicating between two end faces of the honeycomb structure, and plugging portions which are arranged to plug one of two open ends of each of the plurality of cells, the plurality of cells being constituted of outermost circumferential cells positioned in an outermost circumferential portion of the honeycomb structure, and usual cells other than the outermost circumferential cells, the method comprising:
attaching a transparent sheet to an end face of the honeycomb structure;
imaging the end face;
performing image processing of an image obtained by imaging the end face to recognize positions of the usual cells;
performing perforation processing, on the basis of the recognition of the positions of the usual cells, at the positions on the sheet which correspond to the usual cells to be plugged;
recognizing, as positions of the outermost circumferential cells, positions each of which is calculated from an average cell pitch of the usual cells whose positions are recognized by the image processing, each of the positions calculated from the average cell pitch being present on an inner side from a circumference of the end face of the honeycomb structure;
disposing, on the basis of the recognition of the positions of the outermost circumferential cells, virtual perforation regions at positions on the sheet which correspond to the outermost circumferential cells to be plugged, each of the virtual perforation regions being divided into a plurality of squares;
performing perforation processing of perforating at least one of the plurality of squares in each of the virtual perforation regions, the perforation processing including individually setting positions and a number of squares to be perforated in each of the virtual perforation regions in accordance with each of the positions of the outermost circumferential cells to be plugged to which each of the virtual perforation regions corresponds;
immersing an end portion of the honeycomb structure into a plugging slurry in which a material of the plugging portions is slurried, after the perforation processing at the positions corresponding to the usual cells and in each of the virtual perforation regions; and
forming the plugging portions by charging end portions of the plurality of cells to be plugged with the plugging slurry through holes formed in the sheet by the perforation processing at the positions corresponding to the usual cells and in each of the virtual perforation regions.

2. The method for producing the plugged honeycomb structure according to claim 1 ,
wherein the positions and the number of squares to be perforated in each of the virtual perforation regions are set so that a hole made by perforation is present only in an open range of each of the outermost circumferential cells to be plugged.

3. The method for producing the plugged honeycomb structure according to claim 2 ,
wherein the perforation processing at the positions corresponding to the usual cells and in each of the virtual perforation regions is carried out by using laser.

4. The method for producing the plugged honeycomb structure according to claim 1 ,
wherein the perforation processing at the positions corresponding to the usual cells and in each of the virtual perforation regions is carried out by using laser.

Assignees

• Ngk Insulators Ltd

Inventors

• Tanaka Kensuke
• Fujioka Yasumasa

Classifications

• B01D2279/30

  for treatment of exhaust gases from IC Engines · CPC title

• C04B2235/3481

  Alkaline earth metal alumino-silicates other than clay, e.g. cordierite, beryl, micas such as margarite, plagioclase feldspars such as anorthite, zeolites such as chabazite · CPC title

• B32B38/0004

  Cutting, tearing or severing, e.g. bursting; Cutter details (cutting in general B26D; laminating combined with punching or perforating B32B38/04; removing all or part of the layers B32B38/10; cutting in combination with laying up and registration B32B38/185 takes precedence) · CPC title

• B32B37/146

  whereby one or more of the layers is a honeycomb structure · CPC title

• B32B2310/0843

  using laser · CPC title