... SJSZ51/105 Plastic pipe making machine:The process flow of PVC Plastic pipe extrusion machine is as following: Screw feeding ... , high-speed mixing, Spring feeding, Double-screw Extruding, Moulding, Vacuum Finalizing ... -Size, Hauling, printing, Cutting, Pipe Piling-up.Necessary machinery: 1 set of screw feeding machine.1 ...