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Advantages And Disadvantages Of Drum Dryer

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a layer of chromium ( 120 micron) and so designed to withstand high temperature and pressure. The main roller is steam heated while applicator roller are supplied with normal temperature soft water. • The sump level is kept full between applicator roller 1-2 and 2-3 while it is kept half between applicator rollers 3-4 and 4-5. Feeding Method • Roll feeding is effective for viscous and glutinous materials. Multi rolls are used to increase the film thickness, and hence the throughput. • The gap between the rolls and the drum can be adjusted individually and the peripheral velocity of the rolls may or may not be the same as the drum. The advantages of drum drying include: • Good porosity and good rehydration due to boiling evaporation • Drum dryers can dry very viscous foods, such as pastes and gelatinized or cooked starch, which cannot be easily dried with other methods. • Drum dryers normally have high energy efficiency. • Drum drying can be clean and hygienic. • Drum dryers are easy to operate and maintain. • The dryers are flexible and suitable for multiple but • Small quantity production. The disadvantages of drum drying are the following: • Some products may not form a good film on the drum surface and are not suitable for drum drying. • Some products, especially those with high sugar content, may not be easily scrapped off from the drum. • Relatively low throughput compared to spray drying. • High cost of changing drum surface because of the precision machining

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