... -1020Hv3. nitriding brittleness: 2mmA: The flat conical double screw cylinder, suits to process each kind to fill lowly the PVC pipe ... , the plate and soB: The hypercone double screw rod cylinder, suits each kind of PVC tubing, the molding processing. Even double ... screw rod cylinder A : Heterotropic double screw rod cylinder, suits the PVC pipe , the molding, the plate, the PVC pelleting ...