Drying technique is used on the Freeze Drying Machine uses by the principle of sublimation. It freezes the dried material at a low temperature and then directly sublimates the frozen water molecules into water vapor under a suitable vacuum environment. The product obtained by lyophilization is called a lyophilizer, and the process is called lyophilization.

The substance is always in a low temperature (freezing state) before drying, and the ice crystals are evenly distributed in the substance, and the sublimation process does not cause concentration due to dehydration to avoid side effects such as foaming and oxidation caused by water vapor. The dry material is porous in the shape of a dry sponge, and the volume is basically unchanged, so it is easily soluble in water and restored to its original state. Physical and biological denaturation of dry matter is prevented to the greatest extent.

The Freeze Dry Machine is composed of a refrigeration system, a vacuum system, a heating system, and an electrical instrument control system. The main components of the lyophilizer are a drying oven, a condenser, a refrigeration unit, a vacuum pump, and a heating/cooling device. The lyophilizer works by freezing the dried object to below the triple point temperature and then sublimating the solid water (ice) in the article to water vapor under vacuum conditions, removing it from the products, and drying the products. After the material is pre-treated, it is sent to the quick-freezing bin for freezing, and then sent to the drying bin for sublimation dehydration, and then packaged in the post-treatment workshop. The vacuum system establishes a low-pressure condition for the sublimation drying chamber. The heating system provides sublimation latent heat to the material, and the refrigeration system provides the required cooling capacity to the cold trap and the drying chamber.

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