... for the screw is from 30mm to 250mm can be used for the PE ,PP,PVC ,PS.PA Since the designing ... the parallel twin screw are 65mm-145mm. They can be used to process the products, such as PVC pipe,plate,cable ... , saving energy ,and long life etc. model Screw Diameter(mm) Working Length mm Ratio(L/D)Screw TypeScrew Speed(r/min ...