... extrusion speed High degree of automation PVC/LDPE/HDPE pipe extrusion single wall corrugated pipe production lineThe complete unit consists of SJ series ... single screw extruder, nolder of corrugated pipe, molds of tyre, wind cooling unit, counter and winder, ... of PVC, PP, EVA, PA, LDPE and HDPE thermoplastic corrugated pipes. Single Wall Corrugated Pipe Production Line