Structure characteristics: 1. High quality PLC control system with large color LCD touch-screen; technical parameters can be stored 2. Primary and secondary extruding machines both feature large length-diameter ratios for detached screws and good plastic forming to ensure equal sheet thickness and smoothness 3. Screws, machine barrel and die heads all made with high quality alloy steel with nitrogen treatment 4. Electric or hydraulic rapid net changing device 5. Diagonal 3-roller structure: 3 rollers feature direct connecting modes that can adjust speed singly or simultaneously 6. Double-work position air shaft center rewind device for more convenient operation