QuadPass fromDupps Co.is a dual-zone, four-pass rotary drum dryer. The unit produces high thermal efficiencies and prevents thermal degradation. Four-pass design disrupts laminar gas flows to create multiple eddy flows that turbulate and separate. By starting at slow velocities and getting progressively faster, the device dries each particle of material at its individual drying rate, regardless of particle size, density or moisture. When dried, material exits the drum without overheating or volatilizing.

May 2001, RS# 203