... operation 3. pipe diameter 16-40mm PVC dual pipe production machine:1) It is mainly used in the manufacture of PVC ... set is composed of conical twin-screw extruder, vacuum cablibrating tank, haull-off, cutter, stacker or belling machine etc.3) The extruder ... pump and hauling motor employ superior goods.4) Haul-off machine of different specifications, such as two caterpillars, three caterpillars, four ...