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US 4,171,193 AGranted
Apparatus for the production of shaped strands of thermoplastic synthetic-resin material
AssigneeReifenhauser KG
InventorHerbert K. Rahlfs
Life of this patent
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Abstract
A metering pump whose speed is controlled in accordance with product data is provided between an extrusion press and the extrusion die. The speed of the worm is controlled by a pressure/speed regulator and the temperature at the outlet side of the press is maintained constant within .+-.10.degree. C.
Claims10
An apparatus for producing continuous extrusions having predetermined desired product data from a thermoplastic synthetic resin, comprising:
- an extrusion press provided with a speed controller for extruding a thermoplastified stream of synthetic-resin material;
- a metering pump downstream of said extruder for displacing said thermoplastified material at a rate dependent upon the speed of said pump;
- an extrusion die downstream of said pump and traversed by said material to form said extrusion;
- a withdrawal device downstream of said die for drawing the extrusion away from said die;
- first control means operatively associated with said extruder for regulating the speed of said extruder;
- second control means operatively associated with said pump for regulating the speed of pump;
- third control means operatively associated with said withdrawal device for regulating the speed of said withdrawal device;
- and
- a computer means storing the desired product data and controlling said second control means, said withdrawal device being controlled at least in part in dependence upon the speed of said pump.
6 more elements
Dependencies are inferred from the claim text.