The coating thickness of a rotary coating machine is usually adjustable, mainly achieved through the following methods:

Adjust the parameters of spray system: spray pressure and liquid flow rate are the key factors affecting the film thickness. Increasing the spray pressure and liquid flow rate will increase the coating liquid sprayed on the surface of fertilizer particles, thus forming a thicker coating layer; On the contrary, reducing pressure and decreasing flow rate can result in a thinner coating layer. In addition, ensuring that the nozzle is facing the drum and the spraying angle is reasonable can improve the uniformity of the coating and avoid local thickness or thinness.

Adjust the drum speed: The drum speed is closely related to the thickness of the coating. The faster the drum speed, the shorter the contact time between fertilizer particles and the coating liquid when rolling inside the drum, and the thinner the film layer formed; On the contrary, when the drum speed slows down, the contact time between particles and liquid increases, which helps to form a thicker film layer. In practical operation, the required coating thickness can be achieved by gradually adjusting the rotation speed and combining with spray parameters.

Changing the characteristics of the coating material: If the viscosity, concentration, and other properties of the coating material change, it will also affect the thickness of the coating. For example, using a coating material with high viscosity may form a relatively thick coating layer at the same spray and drum speed.

By adjusting the above factors reasonably and optimizing them based on actual production conditions, effective control of the coating thickness of the rotary coating machine can be achieved to meet different production needs.