The domestic multi-layer co-extrusion technology is mainly based on three-layer technology, and some manufacturers have also introduced five-layer or even 7-9-layer co-extruded film production lines.
The three-layer co-extrusion blown film unit developed by Shanghai Kunming Group incorporates European blown film technology and process into one. The three-layer co-extruded film unit adopts a unique screw design to adapt to different raw material combinations. It adopts a PLC full-digital control system, and a fully automatic change-over device is equipped with a hydraulic blanking structure. Adopting an extractor rotation device and EPC edge tracking device. High platform flat rail friction double winder with vector motor and pneumatic control .