The basic working principle of CIP cleaning system: The core of the film is continuously moved in a complex trajectory in the clean and closed rotating drum of the coating machine, with smooth flipping and frequent exchange. The coating medium stirred by the constant temperature mixing bucket is sprayed onto the core by the spray gun through the action of the pump. At the same time, under the action of hot air and negative pressure, it is heated! The 100000 level clean hot air supplied by the wind cabinet passes through the core, passes through the bottom sieve holes, and is then discharged from the air door, allowing the coating medium to quickly dry on the surface of the core, forming a strong, dense, and smooth surface film. The entire process is automatically completed under PLC control.