... calibration tank,haul-off unit,cutting unit ,stacker etc.the single screw extruder and haul-off unit includes two-claw type, ... special device.it can produce inner wall spiral pipe.inner wall hollow pipe.and core layer foam pipe.it can ... of automationAdopting special screw ,good effectAdopting compound spiral engine head,effectively deleting memory function of the materialVacuun sghaping ,constant ...