The production method of plastic sheet material equipment is usually calendered, mainly used for producing sheets such as pvc and PVDC; the other is extrusion method for producing sheets such as BOPS, EPS, PET, PP, HIPS. The sheet referred to herein mainly refers to a sheet for thermoformed packaging articles produced by the "extruder-T type head-three roll calendering-winding" process. In the domestic production of sheet metal industry, with the development of packaging sheets, advanced configurations and new machines are constantly being introduced. For more than a decade, sheet production and sheet machine manufacturers have cooperated with each other and introduced them, which has also improved the overall development level of the plastic sheet industry. New sheet processing technology and new raw and auxiliary materials are fully utilized in advanced equipment.