Youth’s single screw extruder of polyolefin pipe production line is specialized designed for polyolefin products. The design of screws can provide high-speed cutting and mixture for polyolefin material during the process. The special cooling way can prevent the obstruction of material caused by the transportation of heat. Special cooling accessory is installed in ‘reduced speed’ box to lower the high temperature caused by high-speed teeth of screws. Then the good quality and high capacity can be obtained.