It is used for blowing various plastic film of low density polye-thylene(LDPE),high density polyene(HDPE)and linear low density polyethylene(LLDPE)etc.,Which are widely used for packing liquid,industrial products,garments and textile and printing lamination.etc.. The cylinder and the screw stems of the extruder are made of high-quality alloy steel with optimum hardness and strong corrosion resi-stance after nitroqen treatment and precision finishing.The auxiliary machine has a platform working table for making operation easy and is equipped with dubble stabilizing ring.Double rolling and double-cutting coiling unit adopts torque motor to keep proper tension and make even and roll-changing easy.