Drum Dryer is suitable for the materials in the condition of Slurry Liquid. Dry materials, stuck thinly onto the surface of rotating Heat-Drum, are dried and scratched off in the form of Powder * Flake Film by the Scraper-knives while it is rotating, and then after collected. For ways of drum rotation, that of outward and inward is applicable. As to models and types, single and double drums and bottom or top feeding styles are available.