The subject matter of the invention is a waste plastics drying and shredding machine designed in particular for drying and shredding washed waste film of a large size.

According to the patent specification No. EP0090373 published by the European Patent Office, there is a machine for dewatering shredded film consisting of a conical screw rotating inside a cylinder equipped with a chute, at the end of which there is a sieve basket. The narrowing section of the connection terminal causes resistance, waste compression and removal of water which is extracted by a pump.

In accordance with the invention the drying and shredding machine consists of three units connected in sequence, namely of a pressing unit, a sieve, and a shredder. The pressing unit is equipped with a chute linked to the cylinder where there is a piston mechanism, however, the chute outlet is located before the piston dead centre. The sieve shaped like a truncated cone narrowing towards the outlet is attached to the end of the cylinder. At the outlet there is the shredder, the diameter of which is similar to the diameter of the sieve outlet, equipped with a face cutter, powered by an electric motor. The cutter has teeth situated slantwise in relation to the radius and slanted in such a way that their length increases towards the centre, thus giving the cutter a conical profile. In one side of the shredder casing there is an outlet connection terminal. The waste film fed through the chute is pushed in the direction of the sieve where it is compressed and dewatered. The compressed sheets of film, slightly heated due to higher pressure, pass to the shredder where they are torn by the teeth on the disk of the cutter. As a result of that, the plastic film heats up and tears apart and the shreds leaving the shredder quickly lose remnant water.

An example of the drying and shredding machine constructed according to the invention is presented in the diagram figures in which fig.l shows a longitudinal section of the machine, fig. 2 - an enlarged section of the shredder, fig. 3 - a frontal view of the face cutter.

In the cylinder 1 there is a mechanically powered piston 2. The chute 3 of the cylinder 1 is located before the piston dead centre 2. At the end of the cylinder 1 there is a conical sieve 4 which narrows towards the outlet where the shredder 5 is attached. In the casing of the shredder 5 there is a face cutter 6, set on a rotating axle and powered by an electric motor. At the front of the cutter 6 there are teeth 8 situated slantwise in relation to the radius of the cutter 5. The teeth 8 have a varying length increasing towards the centre, therefore in the sectional view the cutter 5 has a conical shape. A thrust block 9 constitutes the rear side of the casing and it is situated opposite the cutter 5 and shaped conically, but there is a gap between the cutter 5 and thrust block 9. In the thrust block 9 there is a central hole 10 connecting the sieve outlet 4 with the inside of the shredder 5. In the shredder casing 5 there is an outlet connection terminal 11 located on the side of the casing and tangential to the periphery of the cutter 6.