... .Processed to our drawing or OEM. Techincal Advantages of PVC extrusion double screw and barrrel/parallel twin screw and barrel : ... & different output requirement.Materials38CrMoAlA (JIS SACM645)SKD61 ApplicationPVC plate, pipe, profile, pellet and mould, at the same time,it solved ... . Parallel twin-screw and barrel is successfully applied in PVC plate, pipe, profile, pellet and mould, at the same time, ...