The freeze-drying principle of freeze dryer is that the material is always at a low temperature (frozen state) before drying, and the ice crystals are evenly distributed in the material. The sublimation process will not condense due to dehydration, avoiding the side effects of steam foaming and oxidation. Dry matter is porous and its volume is essentially constant. Soluble in water, restore to its original shape.

The vacuum system is responsible for pumping out the non-condensable gas generated during the sublimation and analysis process, establishing and maintaining a certain partial pressure for the system, the heating system provides the sublimation heat for the material, and the refrigeration system provides the required cooling capacity for the cold trap and the freeze-drying box . The vacuum freeze dryer adopts layer transfer, radiation and gas convection heating, and the material is heated evenly.

The freeze dryer adopts a water trap to maintain a certain temperature difference with the product in the freeze-drying box to ensure that the water vapor generated can be completely replenished. It adopts electric heating to defrost and defrosts quickly; it adopts vacuum unit and can realize oil-water separation; it adopts artificial intelligence control, which has high control precision and convenient operation.

When the evaporator and cold trap of the vacuum freeze dryer are covered with dust, it will affect the distribution of cold air and heat, which will lead to the weakening of the cooling or heating effect of the vacuum freeze dryer; when the vacuum freeze dryer is turned on, the air in the vacuum freeze dryer will Bacteria will be directly blown into the indoor air, causing direct damage to the human body.

After the vacuum freeze dryer is stopped in hot summer, the cleaning of the vacuum freeze dryer will be neglected, so a large amount of dust, mites, pollen, lice and mold adsorbed on the suction net of the vacuum freeze dryer will start to multiply.

When the vacuum freeze dryer is used again in the next year, these germs, viruses, molds and dust will be blown out by the dryer, often causing large-scale respiratory infections and allergic dermatitis. The frequent replacement of varieties will also lead to pollution problems between varieties.