Problem: High viscosity, poor flow characteristics and high conveyance torque are some of the challenges in processing wet cakes and pastes. Continuous feeding is difficult, and inconsistent feeding results in fluctuating product moisture and poor system control. As efforts to find an existing feeder design that could meet the application requirements failed, Bepex needed to custom design a heavy duty feeder to create a continuous manufacturing process for our dispersion dryer. The continuous production application requirements were met by designing a Bepex International heavy duty Twin Screw Feeder.
Common Mechanical Design Considerations:
Solution: A custom designed Twin Screw and Twin Agitator Volumetric feeder was created to consistently feed wet cake into the Bepex PCX Dispersion Dryer. The feeder functions as a system; twin agitators consistently force the wet cake into the twin screws thus preventing rat holes and bridging. The close clearance twin screws work together to consistently move the wet cake out of the feed zone into the drying system.
The full sized Twin Screw Feeding system housed in the Bepex Process Development Center has proven itself in continuous manufacturing tests using a variety of wet cake and paste materials. Various screw diameters, pitch, flighting and drives have been employed to best meet the specific material characteristics of the applications. Product samples successfully and consistently met final moisture requirements and provided reliable scale-up data to guarantee full-scale process system capabilities.
Benefits and Results: