SJ-B Film Blowing Machine line can produce ground, shack and package film of LDPE, HDPE, LLDPE. Extruder barrel and screw are made of high quality alloy steel, nitrided and manufactured by precision machining. They are provided with very hard surface to resist corrosion and adrasion. Temperature is regulated automatically, reliably and accurately. It is adopted with surface friction double station winding device. Automatic measuring length, simple in operation.