... making machine: 2. PVC plastic conduit pipe making machine characteristics:1) The set is composed of conical twin-screw extruder, vacuum ... machine of different specifications, such as two caterpillars, three caterpillars, four caterpillars, six caterpillars etc are designed for different requirements.4 ... Twin-tube Moulds(max. to 250mm)One set3.Vacuum calibrating and Cooling TankOne set4.Haul-off Unit ...