Characteristics: The cylinders and the screw stems of model sj-45-50 extruder are made of high-quality alloy steel with optimum hardness and strong corrosion resistance after precision finishing and nitrogen treatment. Fm-600 auxiliary machine can be freely adjusted within the limits of 700mm according to the technologjcal requirements of different materials, and is fitted with a plug-in plate mechanism for making vest bag, the double-rolling and double-cutting coiling unit adopts torque motor to keep proper tension and make even and roll-changing easy. Use: It is used for blowing the various plastic film of low density polyethylene(ldpe), high density polythylene(hdpe)and linear low density polyet-hylene(lldpe)etc, which are widely used for packing food, fruit, garments, textile, barbage bag and vestbag other civil and industrial products, etc and for vestbag