... pass water-cooled, 3 Districts heating three sections of cold air.Barrel material; 38CrMoALA Hardness: HRC56-60-62Screw modified Screw ... efficient frequency control of electricity, high precision double vents air ring, rainbow-chip device can further improve the output.( ... , elastic sides etc, to ensure a good film flatness. Air cushion guide steel roller and film flattening roller spin orientation, to ...