It is use for blowing film with the material as LDPE, HDPE, LLPE, etc. Its products are widely used in liquid packing, printing, export product packing, industrial packing and civil products packing such as for foods, fruits, garments, textile and daily products. The screw and barrel of SJ-45*2 extruder is precisely made of high quality steel alloy nitriding, which has the most appropriate hardness and erosion proof. The 600 type auxiliary machine can be adjusted according to different materials and different procedure within the scope of 600mm, which has the plug board and vest bag can be made. The coiling equipment is adopted torque electric motor which can provide appropriate tensile force, neat coiling and convenient coil changing.