Drum Dryer
The drum dryer has acquired a unique place among other dryers because it can dry
products where other dryers give poor or unsatisfactory results.
Like no other dryer, the drum dryer can dry highly-sticky products and/or highlyviscous
media, but low-viscous liquids can also be dried on the drum dryer. The
crust that is then formed on the drum surface is, in contrast with other dryers,
actually welcome!
The drum dryer is heated on the inside and turns continuously. In a full-continuous
process, the product is applied in a thin film on the outside of the drum and begins
to dry immediately. After one rotation, a knife scrapes the dried product off the
drum surface as a film or as flakes.
The drum dryer is an indirect dryer. Unlike direct drying methods, where hot air is
used to evaporate the product moisture, the drum dryer needs no dust recovery. In
addition, the thermal results are more favourable than in other methods because no
heat is lost in the hot exhaust air.