Extrusion-molding device and method for producing molded body using same

Patent metadata

Field	Value
Publication number	US-9375890-B2
Application number	US-201113703443-A
Country	US
Kind code	B2
Filing date	Jun 16, 2011
Priority date	Jun 17, 2010
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

The extrusion-molding device of the invention includes a flow passage for transporting a paste raw material composition; a screw provided at an upstream side of the flow passage to knead the raw material composition and transport it to a downstream side; a die provided at a downstream side of the flow passage to extrude a molded body composed of the raw material composition therefrom; a resistive tube for connecting the flow passage and the die; and a current plate provided between the screw and the die. The current plate comprises a plurality of through-holes that penetrate from a upstream end side to a downstream end side, and an opening of the through-hole on the upstream end side has a larger open area than an opening on the downstream end side.

First claim

The invention claimed is:

1. An extrusion-molding device comprising:
a flow passage for transporting a paste raw material composition;
a screw provided at an upstream side of the flow passage to knead the raw material composition and transport it to a downstream side;
a die provided at a downstream side of the flow passage to extrude a molded body composed of the raw material composition therefrom;
a resistive tube for connecting the flow passage and the die; and
a current plate provided between the screw and the die,
wherein the current plate comprises a plurality of through-holes that penetrate from an upstream end side to a downstream end side and that have spot-faced holes with rectangular cross-sections on upstream ends so that each of the through-holes has a rectangular upstream end opening, a spot-faced hole, a straight-tube section with a substantially circular cross-section, and a substantially circular downstream end opening, and the opening of the through-hole on the upstream end side has a larger open area than the opening on the downstream end side.

2. A method for producing a molded body using an extrusion-molding device comprising:
introducing a paste raw material composition into an upstream side of the extrusion-molding device; and
removing a molded body from a downstream side of the extrusion-molding device;
the extrusion-molding device comprising:
a flow passage for transporting the paste raw material composition;
a screw provided at an upstream side of the flow passage to knead the raw material composition and transport it to a downstream side;
a die provided at the downstream side of the flow passage to extrude a molded body composed of the raw material composition therefrom;
a resistive tube for connecting the flow passage and the die; and
a current plate provided between the screw and the die,
wherein the current plate comprises a plurality of through-holes that penetrate from an upstream end side to a downstream end side and that have spot-faced holes with rectangular cross-sections on upstream ends so that each of the through-holes has a rectangular a upstream end opening, a spot-faced hole, a straight-tube section with a substantially circular cross-section, and a substantially circular downstream end opening, and the opening of the through-hole on the upstream end side has a larger open area than the opening on the downstream end side.

3. The method according to claim 2 , comprising a step of replacing the current plate of the extrusion-molding device.

4. The method according to claim 2 , comprising a step of varying a viscosity of the raw material composition.

5. The method according to claim 2 , wherein the depth of each spot-faced hole is substantially equal.

Assignees

• Komori Teruo
• Yoshino Hajime
• Sumitomo Chemical Co

Inventors

• Komori Teruo
• Yoshino Hajime

Classifications

• B29C48/38

  using two or more serially arranged screws in the same barrel · CPC title

• B29C48/32

  with annular openings, e.g. for forming tubular articles · CPC title

• B29C48/705

  in the die zone, e.g. to create flow homogeneity · CPC title

• B29C48/385

  using two or more serially arranged screws in separate barrels · CPC title

• B29C48/765

  in the extruder apparatus · CPC title