film blowing machine: 1,easy installation 2.saving electricity 3.competitive price 4,high speed film blowing machine:Main Features: 1>The extruder, barrel and screw rods are made of high quality 38CRMOALA alloy steel that have been nitrized and processed in a precision way. It is good in hardness, durable in corrosion resistance. The special designed screw is of high quality, which helps increase ...