Holding material, method for producing same, and gas treatment device using same

Patent metadata

Field	Value
Publication number	US-10138775-B2
Application number	US-201515321277-A
Country	US
Kind code	B2
Filing date	Jun 11, 2015
Priority date	Jun 30, 2014
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A holding material includes a stack of a first mat and a second mat, the first mat including alumina fibers that include 60 wt % or more of alumina and 40 wt % or less of silica, and the second mat including silica fibers that include 60 wt % or more of silica and 40 wt % or less of alumina and having a surface pressure higher than that of the first mat as measured at a gap bulk density of 0.30 g/cm 3 .

First claim

The invention claimed is:

1. A holding material comprising:
a first mat comprising inorganic fibers of only a first type, the first type of inorganic fibers being alumina fibers that comprise 60 wt % or more of alumina and 40 wt % or less of silica; and
a second mat comprising inorganic fibers of only a second type, the second type of inorganic fibers being silica fibers that comprise 60 wt % or more of silica and 40 wt % or less of alumina, and having a surface pressure higher than that of the first mat as measured at a gap bulk density of 0.30 g/cm 3 ,
wherein the holding material is configured to be placed in a gap between a processing structure and a casing in a gas treatment device with the processing structure disposed in the casing, such that the first mat of the holding material comes in contact with the processing structure.

2. The holding material according to claim 1 , wherein either or both of the first mat and the second mat further comprise 1 to 20 wt % of an organic binder.

3. The holding material according to claim 1 , having a thickness of 6 mm to 20 mm.

4. The holding material according to claim 1 , the holding material being a cylindrical laminate in which the first mat is situated on an inner side, and the second mat is situated on an outer side.

5. A method for producing the holding material of claim 1 , comprising:
producing the first mat using the first type of inorganic fibers;
producing the second mat using the second type of inorganic fibers, the second mat having the surface pressure higher than that of the first mat; and
stacking and bonding the first mat and the second mat.

6. A gas treatment device comprising:
the processing structure having a tubular shape;
the casing that accommodates the processing structure therein; and
the holding material of claim 1 that is placed in the gap between the processing structure and the casing,
wherein the first mat of the holding material is situated to come in contact with the processing structure.

7. The gas treatment device according to claim 6 , wherein the processing structure is a catalyst carrier or an exhaust gas filter.

Assignees

• Nichias Corp

Inventors

• Isomura Kazutoshi
• Nakamura Hiroki
• Sato Kiyoshi
• Abe Isami

Classifications

• D04H1/58

  by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives (in combination with needling D04H1/488) · CPC title

• B01D53/94

  by catalytic processes · CPC title

• B01D2239/065

  More than one layer present in the filtering material · CPC title

• B01D2239/0208

  Single-component fibres · CPC title

• F01N3/2864

  the mats or gaskets comprising two or more insulation layers · CPC title