What is the workflow of the coating machine

The coating machine is used for the production of BOPP box sealing adhesive tape. Apply a layer of adhesive, coating, or ink with a specific function to the rolled substrate, and dry it before winding. It uses a dedicated high-speed coating head, which can effectively reduce the occurrence of bubbles. The winding and unwinding of the coating machine are equipped with a full speed automatic film connection arrangement, and tension closed-loop automatic control.
The monotony of the slurry after coating by the coating machine consists of two types of heat and mass transfer processes:
1. The evaporation and vaporization process of external liquid
The wet coating undergoes heat exchange with the monotonic hot air, absorbing the heat of the monotonic air. The liquid on the surface of the coating continuously evaporates into steam and enters the air, which is then carried away by the monotonic air.
When the liquid content of the wet coating is relatively high (above the critical moisture content), the speed of surface vaporization depends on the following factors: A, the speed of surface air activity; The humidity of monotonic air; The temperature of monotonic air
When the coating becomes monotonous until its moisture content reaches the critical moisture content, the rate of vaporization on the surface depends on the rate of loosening of the liquid inside the coating.
2. The internal liquid loosening process is due to the vaporization on the surface of the coating, which reduces the concentration of the liquid on the surface of the coating, and the liquid inside the coating continuously loosens towards the surface.
(1) The coating after the transition stage enters the monotonic chamber, and the surface of the film gradually decreases in temperature due to the evaporation and heat absorption of solvents or water, leading to a leveling process.
(2) The monotonic phase of deceleration, characterized by:
A. Monotonic speed controlled by internal loose speed
B. Monotonic speed decrease
C. The monotonic increase in coating temperature takes a long time
(3) The constant velocity monotonic stage, characterized by:
A. There is satisfactory moisture or solvent on the surface of the coating,
B. The monotonous speed is controlled by external conditions - gasification speed.
C. Stable monotonic speed
D. Most of the water or solvents vaporize during this stage.
E. The surface temperature of the coating is equal to the wet bulb temperature of monotonic air