An apparatus for the pretreatment and subsequent conveying, plastification or agglomeration of plastics, in particular of thermoplastics waste for recycling purposes, with a container (1) for the material to be processed, where the arrangement has, in the container (1), at least one mixing and/or comminution implement (3) which rotates around an axis (10) of rotation and which is intended for the mixing, heating and optionally comminution of the plastics material,
- where the mixing and/or comminution implement (3) comprises implements and/or blades (14), which with their frontal edges (22), in the direction (12) of rotation or movement, have a mixing, comminuting, cutting and/or heating effect on the plastics material, where an aperture (8) through which the pretreated plastics material can be removed from the interior of the container (1) is formed in a side wall (9) of the container (1) in the region of the level of the, or of the lowest, mixing and/or comminution implement (3) that is closest to the base,
- where at least one conveyor (5), in particular one extruder (5), is provided to receive the pretreated material, and has at least one screw (6) which rotates in a housing (16) and which in particular has a plastifying or agglomerating action, where the housing (16) has, located at its end (7) or in its jacket wall, an intake aperture (80) for the material to be received by the screw (6), and there is connection between the intake aperture (80) and the aperture (8), wherein
- the imaginary continuation of the central longitudinal axis (15) of the conveyor (5) or of the screw (6) closest to the intake aperture (80), in a direction opposite to the direction (17) of conveying of the conveyor (5), passes, and does not intersect, the axis (10) of rotation, there being, on the outflow side or downstream in the direction (12) of rotation or of movement of the mixing and/or comminution implement (3), an offset distance (18) between the longitudinal axis (15) of the conveyor (5) or of the screw (6) closest to the intake aperture (80), and the radius (11) of the container (1) that is parallel to the longitudinal axis (15) and that proceeds outwards from the axis (10) of rotation of the mixing and/or comminution implement (3) in the direction (17) of conveying of the conveyor (5),
- and wherein the setting angle (γ) of the radially outermost mixing and/or comminution implement (3), closest to the base, or of the radially outermost implement and/or blade (14) complies with the following relationship:
- y=k*d+K,
- where
- d is the diameter of the screw (6) in mm,
- K is a factor in the range from 15 to 35,
- k is a factor in the range from 0.08 to 0.2,
- where the setting angle (γ) is measured at the radially outermost point (23) of the mixing and/or comminution implement (3), closest to the base, or of the implement and/or blade (14), that is, between the continuation (24) of the, in particular straight, frontal edge (22)
- and the radius (11) running through the point (23), and wherein the ratio of the length (L) of the screw (6), measured from the edge (20′) situated downstream in the direction of conveying of the screw (6), or from the point (20) of the intake aperture (80), situated furthest downstream, to the end of the screw (6) or to the first discharge aperture (30) in the housing (16) for the melt situated furthest upstream in relation to the direction of conveying of the screw (6) at the distal end (31) of the screw (6) remote from the container, to the nominal diameter (d) of the screw (6) is ≧7, preferably ≧10.