Extrusion molding apparatus and manufacturing method for green honeycomb molded body using same

Patent metadata

Field	Value
Publication number	US-9095993-B2
Application number	US-201214113619-A
Country	US
Kind code	B2
Filing date	Apr 27, 2012
Priority date	Apr 28, 2011
Publication date	Aug 4, 2015
Grant date	Aug 4, 2015

Abstract

The extrusion-molding device of the invention is for producing a green honeycomb molded body with a cell structure, and the device includes a housing, a screw, a die with slits, a resistance tube and a fragmenting board having through-passages through which a raw material composition passes from the upstream end side to the downstream end side. The through-passages of the fragmenting board have upstream channels composed of a plurality of flow passages extending downstream from the upstream end side, and downstream channels extending up to the downstream end side and having flow passage cross-sectional shapes different from those of the upstream channels.

First claim

The invention claimed is:

1. An extrusion-molding device for producing a green honeycomb molded body with a cell structure, the device comprising:
a housing with a flow passage for transporting a paste raw material composition;
a screw provided upstream of the flow passage for kneading the raw material composition and transporting it downstream;
a die provided downstream of the flow passage and having slits corresponding to the shape of the cell structure of the green honeycomb molded body;
a resistance tube for connecting the flow passage and the die; and
a fragmenting board provided between the screw and the die, having through-passages through which the raw material composition passes from an upstream end side to a downstream end side thereof,
wherein the through-passages comprise:
upstream channels composed of a plurality of flow passages extending downstream from the upstream end side of the fragmenting board; and
downstream channels extending up to the downstream end side of the fragmenting board and having flow passage cross-sectional shapes different from those of the upstream channels,
wherein the upstream channels are composed of a plurality of flow passages extending downstream essentially straight from the upstream end side of the fragmenting board, while the downstream channels are composed of slits forming a pattern identical or similar to the die slits.

2. The extrusion-molding device according to claim 1 , wherein the ratio (A/B) between the thickness A of the section of the fragmenting board where the slits are formed and the opening width B of the slits on the downstream end side of the fragmenting board is between 1 and 10.

3. The extrusion-molding device according to claim 1 , wherein the ratio (C/B) between the pitch C of the pattern of slits of the fragmenting board and the opening width B of the slits on the downstream end side of the fragmenting board is between 1 and 10.

4. The extrusion-molding device according to claim 2 , wherein the ratio (C/B) between the pitch C of the pattern of slits of the fragmenting board and the opening width B of the slits on the downstream end side of the fragmenting board is between 1 and 10.

5. The extrusion-molding device according to claim 1 , wherein the ratio (C′/B′) between the spacing C′ between the centers of the through-passages on the downstream end side of the fragmenting board and the aperture dimension B′ of the through-passages on the downstream end side of the fragmenting board is between 1 and 10.

6. The extrusion-molding device according to claim 1 , wherein the ratio (B′/D) between the aperture dimension B′ of the through-passages on the downstream end side of the fragmenting board and the opening width D of the slits of the die is 0.2 to 1.5.

7. The extrusion-molding device according to claim 5 , wherein the ratio (B′/D) between the aperture dimension B′ of the through-passages on the downstream end side of the fragmenting board and the opening width D of the slits of the die is 0.2 to 1.5.

8. The extrusion-molding device according to claim 1 , wherein the downstream channels are formed of perpendicularly crossing slits.

9. The extrusion-molding device according to claim 1 , wherein the downstream channels are formed of cross-shaped slits.

10. An extrusion-molding device for producing a green honeycomb molded body with a cell structure, the device comprising:
a housing with a flow passage for transporting a paste raw material composition;
a screw provided upstream of the flow passage for kneading the raw material composition and transporting it downstream;
a die provided downstream of the flow passage and having slits corresponding to the shape of the cell structure of the green honeycomb molded body;
a resistance tube for connecting the flow passage and the die; and
a fragmenting board provided between the screw and the die, having through-passages through which the raw material composition passes from an upstream end side to a downstream end side thereof,
wherein the through-passages comprise:
upstream channels composed of a plurality of flow passages extending downstream from the upstream end side of the fragmenting board; and
downstream channels extending up to the downstream end side of the fragmenting board and having flow passage cross-sectional shapes different from those of the upstream channels,
wherein the upstream channels are composed of a plurality of flow passages extending downstream essentially straight from the upstream end side of the fragmenting board, and the downstream channels are composed of a plurality of slits each connected to the plurality of flow passages.

11. The extrusion-molding device according to claim 10 , wherein the ratio (C′/B′) between the spacing C′ between the centers of the through-passages on the downstream end side of the fragmenting board and the aperture dimension B′ of the through-passages on the downstream end side of the fragmenting board is between 1 and 10.

12. The extrusion-molding device according to claim 10 , wherein the ratio (B′/D) between the aperture dimension B′ of the through-passages on the downstream end side of the fragmenting board and the opening width D of the slits of the die is 0.2 to 1.5.

13. A method for producing a green honeycomb molded body comprising providing the extrusion-molding device according to claim 1 and
extruding a green material with the extrusion-molding device to produce the green honeycomb molded body.

Assignees

• Komori Teruo
• Yoshino Hajime
• Sumitomo Chemical Co

Inventors

• Komori Teruo
• Yoshino Hajime

Classifications

• B28B3/22

  by screw or worm · CPC title

• B28B3/206 Primary

  Forcing the material through screens or slots · CPC title

• B29C47/362

  Operations & Transport · mapped topic

• B29B13/10 Primary

  by grinding, e.g. by triturating; by sieving; by filtering · CPC title

• B29C47/0028

  Operations & Transport · mapped topic