HONEYCOMB FILTER - NGK INSULATORS LTD

Title:

HONEYCOMB FILTER

Document Type and Number:

WIPO Patent Application WO/2011/125768

Kind Code:

A1

Abstract:

The disclosed honeycomb filter (20) is formed the alternating disposition of cells (23) that form a fluid duct of which one end is open and the other end is sealed, and cells (23) of which one end is sealed and the other end is open. Of the honeycomb filter (20), in the upstream region of a partition section (22), a non-filmed region (32) is present that is a region to which at least a collection layer (24) has not been formed and that is at least 5% and no more than 30% of the length of an entrance cell (23). Also, in the upstream region of the partition section (22), there preferably is a non-filmed region that is at least 10% of the area of the cell (23) in a cross section that is perpendicular to the direction of flow of exhaust gas. In this way, when a portion at which the collection layer has not been formed is present in the upstream region, the permeation resistance at the partition of the upstream region becomes lower, and fluids can easily pass through the partition at the upstream region.

Inventors:

MIZUTANI TAKASHI (JP)
NAGATA KOJI (JP)
MIYAIRI YUKIO (JP)

Application Number:

PCT/JP2011/058078

Publication Date:

October 13, 2011

Filing Date:

March 30, 2011

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NGK INSULATORS LTD (JP)
MIZUTANI TAKASHI (JP)
NAGATA KOJI (JP)
MIYAIRI YUKIO (JP)

International Classes:

B01D39/20; B01D46/00; B01D53/94; B01J35/04; F01N3/02; F01N3/28

Domestic Patent References:

WO2008078799A1	2008-07-03
WO2008136232A1	2008-11-13

Foreign References:

JP2003154223A	2003-05-27
JP2002188435A	2002-07-05
JP2008253961A	2008-10-23
JP2004216226A	2004-08-05
JPH0633734A	1994-02-08
JPH01304022A	1989-12-07
JP2010081900A	2010-04-15

Other References: