Manufacturing method of honeycomb structure

Patent metadata

Field	Value
Publication number	US-11542205-B2
Application number	US-201815918147-A
Country	US
Kind code	B2
Filing date	Mar 12, 2018
Priority date	Mar 24, 2017
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

A manufacturing method of a honeycomb structure including:
a dry mixing step of dry-mixing raw materials to form the honeycomb structure by a batch treatment, a wet mixing step of adding a liquid including at least one selected from the group consisting of water, a surfactant, a lubricant and a plasticizer to a dry mixture obtained in the dry mixing step, to perform wet mixing, a kneading step of kneading a wet mixture obtained in the wet mixing step, and a forming step of extruding a forming material prepared in the kneading step, wherein in the dry mixing step, a used forming material passed through the forming step is added as a part of the raw material, to perform dry mixing, and the kneading step includes a liquid re-adding step of further adding the liquid in a process of kneading the wet mixture.

First claim

What is claimed is:

1. A manufacturing method of a honeycomb structure comprising:
a dry mixing step of dry-mixing raw materials to form the honeycomb structure by a batch treatment,
a wet mixing step of adding a liquid including at least one selected from the group consisting of water, a surfactant, a lubricant and a plasticizer to a dry mixture obtained in the dry mixing step, to perform wet mixing, wherein the wet mixing step is performed by a batch treatment,
a kneading step of kneading a wet mixture obtained in the wet mixing step, and
a forming step of extruding a forming material prepared in the kneading step into a honeycomb structure,
wherein in the dry mixing step, a used forming material passed through the forming step is added as a part of the raw material, to perform dry mixing, and
the kneading step includes a liquid re-adding step of further adding the liquid in a process of kneading the wet mixture.

2. The manufacturing method of the honeycomb structure according to claim 1 ,
wherein a reuse ratio indicating a mass ratio of the used forming material in a total amount of the dry mixture is in a range of 20 mass % to 60 mass %.

3. The manufacturing method of the honeycomb structure according to claim 1 ,
wherein a ratio of an amount of the liquid to be added in the liquid re-adding step is in a range of 2 mass % to 10 mass % of a total amount of the liquid added in the wet mixing step and the liquid re-adding step, when a ratio of a total amount of the dry mixture is 100 mass %.

Assignees

• Ngk Insulators Ltd

Inventors

• Nakajo Makoto
• Fukui Toshihiro

Classifications

• C04B2235/6021

  Extrusion moulding · CPC title

• C04B35/62204

  using waste materials or refuse (clay-wares containing waste materials C04B33/132) · CPC title

• B28B3/20 Primary

  wherein the material is extruded {(extrusion moulding of plastics B29C48/00)} · CPC title

• B28C5/003

  Methods for mixing (B28C5/386, B28C5/402 take precedence) · CPC title

• C04B2235/94

  Products characterised by their shape · CPC title