The drying process begins with the material being fed onto the top tray of the dryer through a feed chute. A rotating arm equipped with special blades gently stirs and moves the material along a spiral path across the tray. Once it reaches the outer edge, the material falls to the next lower tray, alternating between smaller and larger trays as it moves downward through the dryer, allowing for gradual and consistent drying. This alternating tray design enables a smooth, uninterrupted flow of material throughout the entire system. Heating media such as steam, hot water, or thermal oil is circulated inside each drying tray, entering from one end and exiting from the other to ensure uniform heat transfer.

Dried material is discharged from the bottom layer, while moisture-laden air is drawn off from the top for exhaust gas treatment. The dry product can then proceed directly to packaging.

The rotary tray dryer is widely used for powder and granule drying in the chemical and pharmaceutical industries, as well as for drying food additives and functional ingredients in the food processing sector.