Extrusion device having position control
AssigneeRoehm GmbH Chemische Fabrik
InventorsAndreas Beringer, Karl Funk, Erhard Haun
Life of this patent
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Abstract
In the extrusion of thermoplastic deformable plastics, especially the manufacture of plastic plates, an automatic regulation apparatus on the roller discharge ensures that the extruded plastic plate is directed horizontally along the device center after leaving the roller calender. The apparatus contains a sensor unit which transmits a position signal for the horizontal position of the plastic plate to a controller which, when a deviation of the plastic plate center from the device center occurs, activates two pneumatic plug cylinders such that the plug force of the haul-off rolls changes the roller diameter and thereby guide the conveyed direction of the plastic plate.
Claims9
An apparatus for regulating a running direction of an extruded plastic plate being conveyed on an extrusion device after the plate leaves a calendar of the extrusion device, comprising:
- two parallel haul-off rolls positioned to form an elongate roller slit through which the conveyed plastic plate passes, the ends of the haul-off rolls being supported by bearings;
- a sensor unit for sensing a position of a plastic plate being conveyed in a running direction;
- position regulators mounted for independently adjusting the positions of the ends of at least one of said haul-off rolls such that a plug force of the haul-off rolls on opposite sides of the conveyed plastic plate may be adjusted;
- and
- a controller responsive to the sensed position of the conveyed plastic plate and operatively connected to the regulators for adjusting the plug force.
Dependencies are inferred from the claim text.