DEVICE AND METHOD FOR PREPARING PLASTIC MATERIAL, IN PARTICULAR THERMOPLASTIC MATERIAL

摘要

The invention relates to a device for preparing plastic material, in particular, thermoplastic material. Said device comprises a receptacle (1) f or accommodating the material, in which revolving tools (21) that are transport ed on a support disc (9) and that act upon the material are provided. The tools revolve around the vertical axis (8) of the receptacle (1). The drive of the support disc (9) is operated by a shaft (4) which passes through the base (3 ) of the receptacle (1) and is driven by a motor (5). The material is removed from the receptacle (1) through a discharge opening (15), onto which the housing (16) of a worm (17) is attached. The discharge opening (15) is provided in the same receptacle (1) and lies below the circular path of the tools (21) and below the support disc (9). Additional tools (12) which are displaced are arranged in said receptacle (1) below the support disc (9) whi ch convey the material into the discharge opening (15). The treated plastic material thus remains in the receptacle (1) for a long period of time, allowing the construction length of the worm (17) to be reduced and the driv e energy of the worm to be saved. The invention also relates to a method for preparing plastic material of this type, in which the material is continuous ly treated by two sets of tools, arranged one on top of the other, in two sequential stages. In the first stage, performed by the upper set of tools, the material is pre-crushed and/or pre-heated and/or pre-dried and/or pre- mixed. In the second stage, performed by the lower set of tools, the materia l is treated in the same way, but in a less intensive manner than during the first stage. The treated material is then fed by the tools of the second sta ge to a worm which discharges the material from the receptacle.