Pipe extrusion is defined as a process of forcing the polymer melt through a shaping die (in this case: circular). The extrudate from the die is sized, cooled and the formed pipe is pulled to the winder or a cut off device with the aid of haul off device. Prior to this, the plastic material in the form of polymer granules is fed into the hopper, conveyed by a rotating screw through a long cylindrical barrel. This is subjected simultaneously to high temperature and pressure, forcing the melt through the die at a predetermined rate.
After Polyvinyl chloride (PVC), Polyethylene’s (PE) is the most widely used thermoplastic piping material.
PE piping systems has many distinct advantages over conventional piping materials.
Moreover they are abrasion, corrosion and chemical resistant. They require lower energy per unit volume (50-70% savings) compared to that required for manufacturing of steel / aluminum pipes, thus giving lower operating costs.
Classification of PE Pipes :