This machine is used for blowing low-density polyethylene (LDPE), high-density polyethylene (HDPE), and linear low-density polyethylene (LLDPE) composite films. These films are widely used in packaging for food, fruits, garments, textiles, daily necessities, and other civil and industrial products. The barrel and screw of the SJ-450*2 extruder are made of high-quality alloy steel, which has been nitrided and precision-machined to provide optimal hardness and corrosion resistance. The 600-type auxiliary machine can be freely adjusted within a 600mm range according to the process requirements of different materials and is equipped with a plug-in plate mechanism for making vest bags. The winding device uses a torque motor to maintain proper tension, ensuring neat winding and easy roll changing.