Spray drying is a method of systematic technology applied to material drying. After the thinner is atomized in the drying room, the water vaporizes quickly in contact with the hot air, and the dry product is obtained. This method can directly dry the solution and emulsion into powder or granular products, which can save the evaporation, crushing and other processes.
The visibility of the spray dryer in the use state is wide. According to the characteristics of the material, it can be dried with hot air or granulated with cold air. It has strong adaptability to the material. It adopts a fully enclosed form. All parts are made of stainless steel. There are three-stage purification devices, the filtered air reaches the requirements of 100,000 grades, and the drying device is used to complete instant drying and form powdery finished products. The traditional Chinese medicine extract powder dried by the spray dryer will not appear scorching and deterioration, which greatly increases the powder collection rate (above 95%), and will not cause drug mixing and wall sticking.
The biggest feature of spray drying is that the surface area of evaporation and drying is very large. For example, when a liquid of 1 cm3 is atomized into a droplet of 100 μm, its surface area will increase by more than 19,000 times, thus causing a sharp increase in the drying rate. Freeze drying requires a longer sublimation drying time, but it can maintain the original quality of the dried product without causing denaturation of the material.
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