Disclosed is an apparatus for the processing of plastics, with a container with a rotatable mixing, where, in a side wall, an aperture is formed, where a conveyor is provided, with a screw rotating in a housing, wherein the imaginary continuation of the longitudinal axis of the conveyor in a direction opposite to the direction of conveying passes the axis of rotation, and wherein the ratio (V) of the active container volume (SV) to the feed volume (BV) of the container or of the cutter compactor (1), where V=SV/BV, is one where 4≤V≤30, where the active container volume (SV) is defined by the formula




SV
=


D
3

⁢

π
4






and D is the internal diameter of the container, and where the feed volume (BV) is defined by the formula






BV
=


D
2

⁢


π
4

·
H



,




where H is the height of the intake aperture.