to extrude HDPE and LDPE plastic film 1. high speed 2. double-winder 3. rotary die-head This film blowing machine, its extruder, cylinder and screw rods are made of quality alloy steel that have been nitrized and processed in a precision way. Hence it is sound in hardness, durable in corrosion resistance, The specially-designed screw is of sound quality in plasticizing, which helps increase the ...