In recent years, the coating is basically using a pre-coating film. Because it is not used for a long time and there are many problems. According to the process practice, the quality of the pre-coating film is mainly affected by three factors: temperature, pressure and speed, so it is correct Dealing with the relationship between the three is very important to ensure the quality of the pre-coating film and the impact on the production of the next process. Paper-plastic coating is the comprehensive result of the physical function of thermocompression bonding. Temperature, pressure, and speed are the three basic factors for achieving this physical comprehensive effect. Correctly handling the relationship between the three is the key to the process operation technology.