The screw adopts parallel twin-screw design, specially designed for polyester PET, with venting, uniform plasticization, oblique three-roll calender design and L-type calender design. The roller temperature can be adjusted by the mold temperature machine, and the product has good toughness. It has high transparency and pre-coated silicone oil device to ensure the release of the sheet during the secondary processing. The thickness of the sheet is positioned by the dial gauge, and the winding is automatically tensioned.