The basic process for freeze drying



A. Product preparation (pre-treatment): This involves various preparatory steps such as drug cultivation, sterilization, packaging, bottle washing, semi-stopper insertion, selection of food raw materials, cleaning, segmentation, enzymatic treatment, and packaging.

B. Product freezing (pre-freeze): The product is frozen until it reaches a solid state.

C. Primary drying (sublimation drying): This stage involves removing ice crystals from the product through sublimation.

D. Secondary drying (desorption drying): In this stage, a higher temperature is applied to the product, allowing the evaporation of remaining moisture to meet predetermined moisture content requirements.

E. Sealed packaging: The processed products are generally sealed in vacuum or under inert gas packing conditions to facilitate storage.

freeze drying