Die head:45# steel,hard chrome-plating. Screw: 38CrMoAl Motor, air blower, up traction unit: inverter controlled automatic SJ Series PVC Hot Shrinkable Film Blowing Machine SJ PVC film blowing machine performance and characteristics:This machine is suitable for blowing PVC heat shrinkable plastic film, which is widely used for packing foodstuff, garment, electric goods, daily-use articles etc. 1. ...