... extruding PVC,PE,PP pipes, sheets,profile... 4.CE Co-rotating parallel twin screw extruder (plastic extruder, plastic machine)Fature and structure: ... SJSH series building block type co-rotating twin-screw extruder mainly composed of barrel screw, gear driven system, measurable feeding, vacuum ... Russia, Canada, Brazil, Iran, New Zealand and so on. Co-rotating parallel twin screw extruder