Spray Drying: Powder through mild Drying of Liquids
Starting Materials Spray Drying
Liquids, watery solutions, emulsions and suspensions serve as precursors for the spray-granulation. Waxes and other melting raw materials can be processed as hot melts, melt emulsions and melt suspensions.
Through a whole range of different conditioning units, we are able to handle and work with the most different raw materials and bring them through mixing, blending, milling, dissolving, emulsifying, heating, cooling, carrying out or even simple chemical reactions (e.g. neutralisation) into the most suitable form for further processing in the fluid bed.
Process Technology Spray Drying
Spray-Drying is the standard technology used when a careful drying and particle formation is required.
Starting from a solution, emulsion or dispersion it is carried out at well-defined temperatures and the shortest possible contact time between sprayed droplets and drying air. The spray drying process generates particles with sizes between 20 µm and 150 µm.
In the framework of spray-drying, this transformation takes place in several stages. At first, the precursor is divided in small particles whereupon these are spread by an air-stream inside the facility. The sprayed material is atomized and transformed in droplets of the same size, if it comes to the best case scenario. In the last process step of spray drying, the generated particles are dried by heated air and separated again.
Results and Benefits Spray Drying
- Drying and particle shaping in one step
- Controlled drying of sensitive products
- Short thermal burden and contact time between droplet and hot air
- Suitability for direct compression