... , doors etc. PLASTIC PROFILE PRODUCTION LINE:consists of conical twin screw extruder, vacuum calibrator , haul-off machine, cutter, stacker etc.Coordinated with ... decorative plates and PVC foam profiles2. Uses frequency conversion for speed regulation,3. Has super-taper twin-screw extruder ... gear surface of the reducer can be operated continuously for a long time without trouble.7. Operation and mold ...