Rotary Shears are used in the process of recycling plastics for converting scraps into particles of required size. Rotary shears are low speed devices characterized by two counter rotating shafts. The shafts rotate at different speeds. The size reduction involves a shearing or tearing action rather than the impact or crushing reduction. More than one pair of shredding shafts is mounted at the bottom of a simple, rectangular feed hopper. They are particularly well suited for the processing of pallets, drums, automobile tires and furniture where coarse size reduction is required. Due to their low speed and open construction, they are not prone to explosion. In comparison with the hammer mills, they are low noise and low potential dust device. They are not applicable to produce particles of small or controlled size.