Patent ID: 7632006

Claim:
A device for mixing and/or plasticizing plastic material, having at least two screws situated adjacent to one another in a shared screw housing, whose screw channels are engaged with one another and are driven to rotate around the particular screw axis by at least one motor, the material to be processed being supplied to the screws through at least one intake opening of the screw housing situated in the area of one front end of the screws and the material processed by the screws leaving the screw housing through at least one outlet opening of the screw housing situated in the area of the other front end of the screws, whereby a mechanism is provided, which alternately imparts a periodic enlargement or reduction in size of the gap that exists between screw channels of the screws that are adjacent to one another, which enlargement or reduction in size is superimposed on the rotational movements of the screw channels ( 7 ) of the screws ( 1 , 2 ), wherein the two screws ( 1 , 2 ) are components of a twin-screw extruder ( 38 ) having conical screws ( 1 , 2 ) that engage into one another with their screw channels, without making contact, which are driven in the same rotational direction.