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US 7,017,732 B2Granted
Multiple extruder configuration
AssigneeBerstorff GmbH
InventorReinhard Uphus
Life of this patent
Estimating the term…
Abstract
The invention concerns a multiple-extruder configuration in which two co-rotating twin-screw extruders and a counter-rotating twin screw extruder are connected to each other with respect to the flow of material.
Claims11
A multiple-extruder configuration, comprising:
- two co-rotating twin-screw extruders for mixing a material to be extruded, each of the co-rotating twin-screw extruders having separate screws such that the two co-rotating twin-screw extruders together comprise four separate screws;
- and
- a counter-rotating twin-screw extruder for building up pressure connected to the co-rotating twin-screw extruders by a connection arranged and dimensioned for conducting a flow of the mixed material from the two co-rotating twin-screw extruders.
An extruder apparatus for mixing compounds with residence time requirements and which also must be extruded at a desired pressure comprising:
- a first feeder for loading the compounds;
- a first co-rotating twin screw extruder for mixing the compounds;
- a second co-rotating twin screw extruder for mixing the compounds;
- a second feeder through which the compounds travel from the first co-rotating twin screw extruder to the second co-rotating twin screw extruder;
- a counter-rotating twin screw extruder;
- a third feeder located so that the compounds flow to the counter-rotating twin screw extruder after mixing by the co-rotating twin screw extruders;
- and wherein the counter-rotating twin screw extruder builds up pressure in the compounds and causes the compounds to exit the apparatus at a desired pressure.
4 more elements
A method of mixing and extruding compounds having residence time requirements and for providing a desired exit pressure comprising:
- sending compounds through a first co-rotating twin screw extruder to mix the compounds;
- sending the compounds mixed in the first co-rotating twin screw extruder through a second co-rotating twin screw extruder, separate from said first co-rotating twin screw extruder, to mix the compounds;
- and
- sending the compounds mixed in the first and second co-rotating twin screw extruders through a counter-rotating twin screw extruder to buildup a desired exit pressure in the compounds.
1 more element
Dependencies are inferred from the claim text.