Roller Drying The roller drying process is becoming comparatively obsolete because of the inherentdis advantages like low solubility of powder, cooked flavour and smaller capacity. However,the roller-dried powder finds special application in the manufacture of confectionery, baby foods, ice-cream, milk sweets, etc. The product to be dried is spread as a thin film on to the smooth surface of a continuously rotating hot drum roller or cylinder, and the film of the dried product is continuously scrapped off by a stationary knife, located opposite the point of application of milk. The film has to be ground to obtain powder. Roller Drying Operation The product may be placed in its natural form or pre-condensed in a vacuum pant evaporator before it is fed to the drum drier. The pre-heated product is pumped intoh The reservoir between the upper portion of the rotating drums (14-19 rpm) to provide a thin layer over the turning drums (Fig. 4.7). The drums are heated i...
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