Spray drying, which produces a dry powder from a liquid or slurry, is one of the most popularly-used continuous drying processes. A liquid including solutions, emulsions, wet slurry and suspensions is sprayed via a spray nozzle or a rotary atomizer into a drying chamber.

Continuously feeding heated gas while increasing the surface area of sprayed droplets rapidly dries and makes granules. Therefore, degeneration of the powder is exceptionally low and the process can be the preferred process of thermally sensitive materials. Dried granules are highly close to spherical in shape and have excellent fluidity. For foods and pharmaceuticals, they will be easily soluble in water. For inorganic materials such as metallurgical powders and fine ceramics, high-density moulds can be obtained.