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[[File:Drum-dryer.jpg|thumb|200px|right|Drum Dryer]] | |||
The Drum drying is a method used for drying out liquids; for example, milk is applied as a thin film to the surface of a heated drum, and the dried milk solids are then scraped off with a knife. Powdered milk made by drum drying tends to have a cooked flavor, due to caramelization caused by greater heat exposure. | |||
Compared to spray drying, drum drying is a more intense heat treatment which results in more denatured proteins. The powder is less soluble as a result. The temperature uniformity of the heated roller/drum is poor so spray drying results in better quality milk powder. | |||
Other products where drumdrying can be used are for example starches, breakfast cereals, baby food, instant mashed potatoes to make them cold water soluble. | |||
===Operating Principle== | |||
The '''Drum Dryers''' are basically a conduction dryer. Wet feed film (in liquid or paste form) is applied to the rotating metal cylinder inside which, a heating medium is supplied. Material film dries to the final moisture level and is scraped off. | |||
===Special Features=== | |||
* Suitable for handling liquid or pasty feeds. | |||
* Product is powdery, flaky form | |||
* Uniform drying due to uniform application of film. | |||
* Medium range capacities. | |||
* Very High thermal efficiency | |||
* Continuous operation | |||
* Compact installation | |||
* Closed construction is possible | |||
===Applications=== | |||
* Calcium Carbonate | |||
* Sodium Benzoate | |||
* Brewer's Yeast | |||
* Calcium Chloride | |||
* Potasium Phenyl Acetate | |||
* Polyacrylamide Gel | |||
* Sodium Acetate | |||
* Dye Intermediate | |||
* Sulphur Black | |||
* Calcium Lactate | |||
* Resis Salt | |||
* Animal Glue | |||
* Barium Sulphate | |||
* Soya Residue (Okara) | |||
* Sodium sulphate | |||
* Acid Voilet | |||
* Pregel Starch | |||
* Distiller's Yeast | |||
* Di- Potassium Phosphate | |||