This unit is made of the shaker, the high-speed mixer and the refrigerator, plastic powder charging machine, the cone-shape double screw plastic extruding machine, (single screw rod extruding machine) the nose, the double- wall corrugated pipe shaper, the plastic pile flaring machine, piling bin, the cold- water machine and the air compressor, which is mainly used in producing plastic double- wall corrugated pipe and the plastic single-wall corrugated pipe such as PVC and PE