DW series many layers belt dryer is used in the material hard to dry and low dry speed. The equipment structure is compact. It covers small area with easy operation, convenient maintain and steady running. The equipment extend and promote the heat wind circle oven which design the dryness process with different heat wind circle as per the dryness characteristics of materials. It is widely used in chemical, metallurgy industry, food, packaging. The dryer has lots of superiorities as high efficiency, saving energy, easy management, larger output, constant product and varied ability.