Author : T. Ravali Lahari and Dr.G.Srinivas Sharma

Plastics are endangering environment due to excess usage by the urbanized communities all round the world and due to its non-decomposable property, handling the waste is hazardous. In the present work, a plastic shredding machine with hot barrel is designed using the fundamentals of rheology, polymer science, heat transfer and design aspects of machine components for new product development. The specific flow rate, pressure drop, shear rate, residence time, conveying efficiency are calculated and presented for parametric analysis. The behavior of plastic melt flow during the melt conveying zone, heat transferred, and adiabatic temperature rise is discussed.

Keywords: Screw conveyor, viscosity, pressure drop, LDPE, HDPE, shear rate, extruder, flow rate.