Method and device for producing ceramic formed body

Patent metadata

Field	Value
Publication number	US-12036697-B2
Application number	US-202016738058-A
Country	US
Kind code	B2
Filing date	Jan 9, 2020
Priority date	Jan 24, 2019
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

A method for producing a ceramic formed body comprises: a wet mixing step of adding a liquid containing water to ceramic raw material mixed powder and subjecting it to wet mixing in a continuous mixer; and an extrusion molding step of feeding the wet mixed powder obtained in the wet mixing step to an extruder by a belt feeder and extruding the wet mixed powder. In the method for producing the ceramic formed body, an amount of the wet mixed powder fed to the extruder is adjusted based on an amount of mass change of the wet mixed powder stored in a reservoir provided between the continuous mixer and the belt feeder.

First claim

What is claimed is:

1. A method for producing a ceramic formed body, the method comprising:
a wet mixing step of adding a liquid containing water to ceramic raw material mixed powder and subjecting it to wet mixing in a continuous mixer; and
an extrusion molding step of feeding the wet mixed powder obtained in the wet mixing step to an extruder by a belt feeder and extruding the wet mixed powder,
where an amount of mass change per predetermined time of the wet moved powder stored in a reservoir provided between the continuous mixer and the belt feeder is measured;
wherein an amount per predetermined time of the wet mixed powder fed to the extruder is adjusted by controlling a speed of the belt feeder based on the measured amount of mass change per predetermined time of the wet mixed powder stored in the reservoir; and
wherein the measured amount of mass change per predetermined time of the wet mixed powder stored in the reservoir is equal to the adjusted amount per predetermined time of the wet mixed powder fed to the extruder.

2. The method for producing the ceramic formed body according to claim 1 , wherein the wet mixed powder is extruded into a honeycomb shape.

3. The method for producing the ceramic formed body according to claim 1 , wherein the ceramic raw material mixed powder is ceramic raw material dry mixed powder obtained by dry-mixing in a batch mixer.

4. The method for producing the ceramic formed body according to claim 1 , wherein the liquid further contains one or more selected from surfactants, lubricants and plasticizers.

5. A device for producing a ceramic formed body, comprising:
a continuous mixer for adding a liquid containing water to ceramic raw material mixed powder and wet-mixing it;
a belt feeder for feeding wet mixed powder obtained by the continuous mixer to an extruder;
the extruder for extruding the wet mixed powder fed from the belt feeder;
a reservoir for temporarily storing the wet mixed powder, the reservoir being provided between the continuous mixer and the belt feeder; and
a control unit determining an adjusted amount per predetermined time of the wet mixed powder fed to the extruder based on an amount of mass change per predetermined time of the wet mixed powder stored in the reservoir;
wherein the control unit is configured to adjust the amount per predetermined time of the wet mixed powder fed to the extruder by controlling a speed of the belt feeder such that the amount of mass change per predetermined time of the wet mixed powder stored in the reservoir is equal to the adjusted amount per predetermined time of the wet mixed powder fed to the extruder.

Assignees

• Ngk Insulators Ltd

Inventors

• Nakamura Hirotada
• Yamada Takuya

Classifications

• B28B13/0275

  Feeding a slurry or a ceramic slip · CPC title

• B28B13/0215

  Feeding the moulding material in measured quantities from a container or silo · CPC title

• B28B3/269

  For multi-channeled structures, e.g. honeycomb structures · CPC title

• B28B2003/203

  for multi-channelled structures, e.g. honeycomb structures · CPC title

• B28C7/024

  by measuring properties of the mixture, e.g. moisture, electrical resistivity, density · CPC title