Device and method for degassing plastic materials, in particular high-molecular polycarbonate solutions

The invention relates to a device for degassing plastics, especially for degassing polycarbonate solutions of high molecular weight. Said device is provided with a twin-screw extruder that has co-rotating, intermeshing screws. The device is characterized in that the extruder has a length/diameter ratio of smaller/equal 40 and that the screws are double-lead in the degassing zone of the extruder and triple-lead in its pressure build-up zone. The inventive device facilitates the economical production of a polycarbonate with an especially high transmission degree. The invention also relates to a corresponding method.