... 3.Processed to our drawing or OEM. Techincal Advantages of PVC extrusion double screw and barrrel/parallel twin screw and barrel ... and barrel is widely used in PVC products processing, especially for the production of PVC products with the output over 350Kg / h, because ... .4. Parallel twin-screw and barrel is successfully applied in PVC plate, pipe, profile, pellet and mould, at the same time ...