The vacuum belt dryer is a device that uses low-temperature belt heat transfer in a vacuum environment for drying. The principles of the drying process mainly involve vacuum, heat transfer and material transportation.

The following is the basic drying process principle of vacuum belt dryer:

Vacuum environment: In a vacuum state, the pressure of the system is reduced, allowing water to evaporate at a lower temperature. This helps prevent the adverse effects of high temperatures on materials, especially for heat-sensitive materials.

Belt heat transfer: There is usually a belt conveyor system in the dryer, and the material moves along the heat transfer area through this belt conveyor. The heat transfer area usually includes heating and cooling sections. In the heating section, the moisture on the surface of the material is heated and evaporated by providing a heat source (usually an electric heating pipe or a steam heater). Belt heat transfer helps transfer heat to the material evenly.

Material transportation: The belt conveyor transports materials from the inlet to the outlet, and the entire process is continuous. This helps to keep the material drying under the same temperature and vacuum conditions, ensuring consistent drying results.

Vacuum suction: The drying chamber is usually equipped with a vacuum suction system to maintain the vacuum state of the system. By reducing the pressure in the drying chamber, the boiling point of water is lowered, making it easier for water to evaporate from the material.

The principle of the vacuum belt dryer is to evaporate the moisture in the material at a lower temperature through low-temperature heat transfer and continuous belt material transportation in a vacuum environment, thereby achieving the purpose of drying. This drying method is suitable for temperature-sensitive materials and materials sensitive to high temperatures.