Four-Pass Rotary Drum Dryer A Superior Solution For... Agribusiness Industries Food Industry Forest Products Industry Municipal & Industrial Wastes Animal Protein Recycling Industry Lower voc emissions, better product quality, and more uniformly dried product than single-and-triple-pass rotary drum dryers. Optimum dryer performanceThe patented dual-zone,
four-pass QuadPass rotary drum dryer produces high thermal efficiencies, prevents thermal degradation of products, improves product quality, and impedes air pollution. The four-pass drum design disrupts laminar flows, turbulating and separating the products being dried. The design parameters of time, temperature and turbulence allow optimum dryer performance in the dual-zone QuadPass drum.