Food freeze dryer for vegetable and fruit is dried in a vacuum environment, so the raw materials can be dehydrated at a low temperature, and then enter the freeze drying chamber. In a vacuum state, the temperature rises to several tens of degrees, which promotes the direct sublimation of moisture in frozen foods. The freeze-dried grain prepared by the freeze dryer equipment is a process of dehydrating food in a very low temperature environment under a vacuum state. Water can be directly transformed from a solid state to a gas state, without sublimation to transform the intermediate liquid state.

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