An appropriate air flow rate ensures that fine powder is efficiently carried out of the mill

Air flow rate plays a crucial role in the classification and transportation of powder. An appropriate air flow rate ensures that fine powder is efficiently carried out of the mill, while coarse powder is recycled. A too-low air flow rate leads to the accumulation of fine powder in the mill, reducing grinding efficiency and causing powder agglomeration.

A too-high air flow rate increases energy consumption and may carry oversized particles out of the mill, affecting product quality. The optimal air flow rate is determined by the product fineness and the properties of the material. For example, finer powder requires a higher air flow rate to ensure effective transportation.​
 

Hot air temperature is mainly used to dry materials with high moisture content. The optimal hot air temperature depends on the moisture content of the raw material and the required moisture content of the finished product. If the raw material has high moisture content, a higher hot air temperature is needed to remove the moisture.

However, excessively high temperatures may cause thermal damage to the material, especially for heat-sensitive materials such as food and pharmaceuticals. Therefore, operators should adjust the hot air temperature based on the material's moisture content and heat resistance, ensuring that the finished product meets the moisture requirements without quality degradation.​