The screw is PVC, PMMA, PE and ASA special screw. The heating style of charging barrel is ceramic heating and the cooling style is air cooling. Main motor is converter speed regulated. There're wheels on the bottom of co-extruder which make the extruder movable and can brake. It is used to make the marking line on various pipes. Front co-extruder can extrude color layer of PVC color profile, and back co-extruder can extrude soft rubber bar of PVC profile.