HONEYCOMB FILTER FOR PURIFYING EXHAUST GAS

Title:

HONEYCOMB FILTER FOR PURIFYING EXHAUST GAS

Document Type and Number:

WIPO Patent Application WO/2002/074417

Kind Code:

A1

Abstract:

A honeycomb filter for purifying exhaust gas, comprising a honeycomb structure (1) having a plurality of through holes, partitioned by a porous barrier wall, sealed alternately with an exhaust gas inflow side end face (2) and an exhaust gas outflow side end face (3). The honeycomb structure (1) has a slit (5) at least opening to the exhaust gas inflow side end face (2) wherein the slit (5) is partially filled with a filler (6) in the direction of exhaust gas channel (10) from the exhaust gas outflow side end face (3) at a depth 3-25 times the slit width (5d) and an air gap region (5e) is formed on the inside of the part filled with the filler (6). The honeycomb filter for purifying exhaust gas exhibits a high thermal shock resistance while sustaining high purification performance and it can be used continuously over a long term.

Inventors:

HAMANAKA TOSHIYUKI (JP)
HARADA TAKASHI (JP)

Application Number:

PCT/JP2002/001895

Publication Date:

September 26, 2002

Filing Date:

March 01, 2002

Export Citation:

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Assignee:

NGK INSULATORS LTD (JP)
HAMANAKA TOSHIYUKI (JP)
HARADA TAKASHI (JP)

International Classes:

F01N3/02; B01D39/14; B01D39/20; B01D53/94; B01J35/04; B28B3/26; F01N3/022; (IPC1-7): B01D39/20; B01D46/00; F01N3/02

Foreign References:

JPH0527215U	1993-04-09
JP2000153117A	2000-06-06
JPH0828246A	1996-01-30
JP2000102709A	2000-04-11
JP2002060279A	2002-02-26

Other References: