Double screw extruder
AssigneeHans Weber Maschinenfabrik GmbH
InventorRainer Viessmann
Life of this patent
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Abstract
What is described is a twin screw extruder having two extruder screws (10, 34), each extruder screw (10) having a cylindrical core (12) and at least one web (14) running helically over the periphery of the outer cylinder face of the core (12), the surface of the web (14) comprising a peripheral side (18) and two flanks (22, 24), and a channel (30) being formed between adjacent web windings. The flanks (22, 24) of the web (14) have a waved progression in the peripheral direction.
Claims17
A twin screw extruder having extruder screws driven in opposite directions, each extruder screw having a core and at least one web running helically over the periphery of the outer face of the core, the web comprising a peripheral face and two flanks, and a channel being formed between adjacent web windings, wherein the flanks of the web have the shape of a wave running in the peripheral direction, and in that the width (W) of the channel is constant.
A twin screw extruder comprising:
- two extruder screws for extrusion of plastic material driven in opposite directions, each extruder screw having a core and at least one continuous screw shaped web running helically over the periphery of the outer face of the core, the continuous screw shaped web comprising a peripheral face and two flanks, and a channel being formed between adjacent web windings;
- wherein the flanks of the continuous screw shaped web have the shape of a wave running in the peripheral direction;
- wherein the waveform of the flanks permits movement of the plastic material transverse to a conveying direction of the channel, forcing a change in position of the plastic material to be plasticized for improved mixing of the plastic material;
- and
- wherein the width (W) of the channel of each extruder screw is constant.
Dependencies are inferred from the claim text.