Extruder system with pressure regulating device

Patent metadata

Field	Value
Publication number	US-11697223-B2
Application number	US-201816629468-A
Country	US
Kind code	B2
Filing date	Jul 6, 2018
Priority date	Jul 10, 2017
Publication date	Jul 11, 2023
Grant date	Jul 11, 2023

Abstract

An extruder system for degassing a mixture, comprising a first extruder, a second extruder arranged downstream of the first extruder and a transfer zone formed between these extruders, characterized by a pressure regulating device which can regulate the pressure at the outlet of the first extruder.

First claim

What is claimed is:

1. An extruder system for degassing a mixture comprising:
a first extruder,
a second extruder arranged above the first extruder in relation to a gravitational direction and downstream of the first extruder, and
a transfer zone formed between the first and second extruders;
characterized by a pressure control device by which the pressure of the mixture at the discharge of the first extruder can be regulated;
wherein the extruder system comprises a means for increasing a surface of the mixture passed through the transfer zone;
wherein the transfer zone includes a first pipeline part arranged parallel to the first extruder and positioned downstream of the first extruder and a second pipeline part arranged perpendicular to the first pipeline part and positioned between the first pipeline part and the second extruder, wherein the pressure control device includes a slide valve within the first pipeline part which narrows an opening from the first pipeline part to the second pipeline part.

2. The extruder-system according to claim 1 , characterized in that the pressure control device is controlled in such a way that the pressure of the mixture at the discharge of the first extruder is greater than in a degassing zone of the second extruder adjoining the transfer zone.

3. The extruder system of claim 1 , wherein the means for increasing a surface comprises a perforated plate through which the mixture guided through the transfer zone is divided into several partial streams.

4. The extruder system of claim 1 , wherein the means for increasing a surface comprises one or more slot nozzles in the transfer zone, wherein the mixture is passed through the one or more slot nozzles.

5. The extruder system according to claim 4 , characterized in that the pressure control device is controlled in such a way that the pressure of the mixture at the discharge of the first extruder is greater than in a degassing zone of the second extruder adjoining the transfer zone.

6. The extruder system according to claim 5 , wherein the means for increasing a surface comprises a perforated plate through which the mixture guided through the transfer zone is divided into several partial streams.

7. The extruder system according to claim 1 , characterized in that in a degassing zone of the second extruder adjoining the transfer zone there is provided a degassing outlet in relation to the gravitational direction.

8. The extruder system according to claim 1 , characterized in that a closable outlet is provided in the region of the transfer zone for the discharge of the mixture.

9. The extruder system according to claim 8 , characterized in that the outlet can be closed by means of the pressure control device.

10. The extruder system according to claim 9 , characterized in that the pressure control device comprises a slide valve.

11. The extruder system according to claim 1 , characterized in that a volume cross section of the first extruder is smaller than a volume cross section of the second extruder.

12. The extruder system according to claim 1 , characterized in that an extruder screw of the first extruder can be driven at a higher angular velocity than an extruder screw of the second extruder.

Assignees

• Arlanxeo Deutschland Gmbh

Inventors

• Kirchhoff Jörg
• König Thomas

Classifications

• B29B7/72 Primary

  Measuring, controlling or regulating · CPC title

• B29B7/845 Primary

  Venting, degassing or removing evaporated components in devices with rotary stirrers · CPC title

• B29B7/42

  with screw or helix · CPC title

• B29B7/801

  Valves · CPC title

• B29B7/48

  with intermeshing devices, e.g. screws · CPC title