The production line of twin-screw dryer-free exhaust type PET sheet produced by Jinwei Company has the characteristics of low energy consumption, simple process and convenient maintenance. The special screw combination structure effectively reduces the viscosity drop of PET resin, the symmetrical thin-wall roller improves the cooling efficiency and improves the productivity and sheet material quality, the multi-component feeding device is reasonable, control the proportion of new material, return material, color masterbatch, etc. . The produced sheet can be used in the field of blister printing and packaging.