Ross vertical blender/dryers are ideal for vacuum drying a wide range of applications, such as powders, granules, pellets, fibers, pastes, and slurries. This type of drying equipment features a slow-turning auger screw that gently lifts batch materials upward as it orbits around a conical vessel. Materials carried to the top of batch then cascade slowly back down into regions opposite the moving auger screw. The constant exchange of materials between the heated sidewalls and center of the blender accelerates the drying process.
A common issue in agitated dryers is the risk of product attrition or generation of fines. This concern is well minimized in a vertical blender/dryer because the blending action is thorough but low impact. During the drying cycle, hot water, oil, or steam is recirculated through the vessel jacket. Due to lower processing temperatures made possible by the vacuum environment, there is a reduced risk of creating hot spots on the vessel walls where product could bake.
Available in sizes from 1 through 500 cu ft, the vertical blender/dryers do not require a bottom support bearing to keep the screw steady so discharge is virtually 100% complete. This “unsupported screw” design also simplifies cleaning and maintenance. The pictured 1-cu-ft model is now available for testing at the Ross Test & Development Center
Charles Ross & Son Co., Hauppauge, NY 631-234-0500 www.mixers.com
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