Be used in blast-producing all types of plastic film of LDPE, HDPE, LLDPE, and the package of civil industrial goods: food, fruit, costume, textile, etc. Characteristics: SJ-50-85 Extruder uses spin die head, 38CrMoA1 by way of nitridation and precision finishing, so it has optimal hardness and corrosion proof. FM-600 auxiliary engine can be regulated freely within the range of 70mm according to technological requirements and add a plug-in board machine which can make vest bag. The power of rolling-up device uses moment motor which can keep proper strain, roll up orderly and be easy to alternate reel.