Powdered food product

摘要

Prodn. of powdered food comprises grinding a fibrous and moist food prod. by projecting it against a hard surface and simultaneously drying in hot air. The food is projected pref. against a cylindrical vertical internal wall by means of an axial rotor comprising a shaft to which projecting elements are attached. Drying with a stream of hot air takes place between the rotor and the walls and is at 200-400 degrees C at the beginning of drying and at 50 to less than 200 degrees C at the end of the drying process. The food is selected from fruit or vegetable juice extracts, beetroot sugar extracts, coffee residues or pref. compressed residues of aq. plant material hydrolysates with a 20-40 % water content.