an apparatus for processing thermoplastic synthetic plastic material includes a receptacle in which a rotating tool circulates around an axis . the axis of rotation may be offset with respect to the axis of the receptacle by a predetermined amount . from the receptacle , the comminuted material is conveyed by the rotating tool into the inlet opening of a screw - type extruder which has an axis that is offset relative to a parallel radius of the receptacle . the offset arrangement allows the rotating tool improves the flow of the processed material into the screw - type extruder .