# US 9,873,071 B2 · Honeycomb structure and manufacturing method of honeycomb structure

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- Number: US 9,873,071 B2
- Document ID: US9873071B2
- Status: Granted
- Kind: B2
- Application number: 14/618,253
- Filed: 2015-02-10
- Published: 2015-06-04
- Granted: 2018-01-23
- Earliest claimed: 2012-03-22
- Assignees: NGK Insulators, Ltd.
- Applicants: NGK Insulators, Ltd.
- Inventors: Yusuke Tsuchiya; Hiroyuki Suenobu
- Web page: https://patentgrep.com/patent/US9873071B2

## CPC

- B01D 46/0005: {Mounting of filtering elements within casings, housings or frames (B01D46/2422 takes precedence)}
- B01D 46/0001: {Making filtering elements}
- B01D 46/244: {of the plugs}
- B01D 46/24491: {Porosity}
- B01D 2279/30: for treatment of exhaust gases from IC Engines
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

The honeycomb structure includes a honeycomb structure part having porous partition walls, and porous plugged portions, and when there is drawn a straight line as an inner boundary line which is positioned at a distance of 30% of a distance between an outer end surface and an inner end surface, from the inner end surface, and there is drawn a straight line as an outer boundary line which is positioned at a distance of 70% of the distance between the outer end surface and the inner end surface, from the inner end surface, each of the plugged portions has an outer region, and an inner region which is the region between the inner end surface and the inner boundary line and whose porosity is larger than a porosity of the outer region.

## Claims

### Claim 1

A manufacturing method of a honeycomb structure comprising:
a formed honeycomb body preparing step of extruding, into a honeycomb shape, a kneaded material obtained by kneading a forming raw material containing a ceramic raw material, to prepare a formed honeycomb body having partition walls with which there are formed a plurality of cells extending through the formed honeycomb body from one end surface to the other end surface;
a plugged formed honeycomb body preparing step of continuously rubbing, into open frontal areas of the cells of the prepared formed honeycomb body, a plugging material including the forming raw material containing the ceramic raw material and 1.5 to 35 mass % of resin balloons, to fill the plugging material into the open frontal areas, thereby preparing the plugged formed honeycomb body; and
a honeycomb structure preparing step of firing the prepared plugged formed honeycomb body, to prepare the honeycomb structure in which porous plugged portions are arranged in one end portion of each of the predetermined cells and the other end portion of each of the remaining cells.

### Claim 2 (depends on 1)

The manufacturing method of the honeycomb structure according to claim 1,
wherein a viscosity of the plugging material is from 30 to 2000 dPa·s.