Device for preparing thermoplastic material

An apparatus for reprocessing thermoplastic synthetic plastic material, comprising a receptacle for the synthetic plastic material to be processed, said receptacle having at least one rotating tool which conveys the synthetic plastic material through a discharge opening of the receptacle such that a component of a stuffing force is exerted on the synthetic plastic material in the axial direction of this discharging opening and transmitted thereto always by synthetic plastic material subsequently being pressed in, said discharge opening leading to an inlet opening for the synthetic plastic material arranged in a side wall of a screw housing of a screw, whereby the interior surface of said screw housing of the screw in the area of the inlet opening has a pocket-like enlargement, which provides an additional space to accommodate synthetic plastic material and which is confined by an adjustable wall piece on that edge of the inlet opening on which the direction of rotation of the screw is directed towards the receptacle said wall piece allowing the enlargement to be at least partially closed off from the receptacle whereby the enlargement gives way to several grooves at least in the area of the screw housing adjoining it in the transport direction of the screw and whereby said grooves are of a depth which decreases to the screw diameter in this area and in which the grooves are separated from each other in this area by rigid ribs projecting toward the screw relative to the wall of the enlargement of the screw housing, each of these grooves providing a space for the synthetic plastic material, the longitudinal direction of which space having a substantial component extending in the axial direction of the screw.