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Vacuum freeze drying

Freeze Drying is a process of drying that involvesfreezing the product, lowering pressure, then removing the ice by sublimation.After preparing the raw material, there are 3 main processes as follows; First, Freezing the product to the freezing point. Second is primary drying, this is a process is where most of moisture is drawnoff by evaporating the water particles at extremely low temperature. Lastly,it’s called secondary drying. When the primary drying is complete The ice willmet. There will be residual moisture. So increasing the temperature will pullout the remaining moisture that is left to the leve that is prospered