The vacuum dryer is composed of a refrigeration system, a vacuum system, a heating system, and an electrical instrument control system.
The main components are drying box, condenser, refrigeration unit, vacuum pump, heating/cooling device, etc. Its working principle is to freeze the item to be dried to below the triple point temperature, and then directly sublime the solid water (ice) in the item into water vapor under vacuum conditions, remove it from the item, and dry the item. After pre-processing, the materials are sent to the quick-freezing bin for freezing, then sent to the drying bin for sublimation and dehydration, and then packed in the post-processing workshop. The vacuum system establishes low pressure conditions for the sublimation drying chamber, the heating system provides latent heat of sublimation to the material, and the refrigeration system provides the required cooling capacity to the cold trap and drying chamber.
The vacuum dryer adopts high-efficiency radiation heating, and the material is heated evenly; it adopts a high-efficiency water trap, which can realize rapid defrosting; it adopts a high-efficiency vacuum unit, which can realize oil-water separation; Stable condition, favorable for energy saving; artificial intelligence control, high control precision and easy operation.
The quality requirements for freeze-dried products are: unchanged biological activity, uniform appearance and color, full shape, firm structure, fast dissolution rate, and low residual moisture. To obtain high-quality products, one should have a more comprehensive understanding of the theory and process of freeze-drying.
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