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Freeze Drying Principle

  1. Freezing: The food is rapidly frozen under low temperature conditions, causing the water inside to form ice crystals.

  2. Reduced pressure: The frozen food is placed in a vacuum chamber, and the surrounding pressure is reduced, causing the ice crystals to convert into water vapor at a lower temperature.

  3. Water removal: The water vapor is drawn out by a vacuum pump, causing the water inside the food to change directly from a solid to a gas state, thus avoiding the loss of nutrients caused by water.

  4. Solidification: After pressure reduction and water removal, the water inside the food has been completely removed, resulting in a dry state.

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