... machine,plastic film machine,film extruder,film making machine,film blowing machine,machine plastic film blowing machine,film machine,plastic film machine,film extruder,film making machine,film blowing machine,machine ... of 38CrMoAl high quality alloy steel after fine finishing and nitrided treatment, which has ... smooth discharging, the blownplastic film has fine finishing ,the blower is of labyrinth ...