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CHARLES ROSS & SON CO.: Planetary Dual Disperser

August 30, 2011
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The planetary dual disperser (PDDM) is reportedly ideal for the powerful mixing of high-viscosity applications requiring ultra-fine dispersion quality. The PDDM features four agitators-two planetary stirrers and two high-speed shafts-all rotating on their own axes while orbiting the mix vessel on a common axis. Pictured is a 40-gal model equipped with built-in vacuum pump assembly for operation up to 29.5” Hg.

The two saw-tooth blades on each high-speed shaft provide intensive shearing action, reportedly promoting solids dispersion and particle size reduction. The planetary stirrers continually turn over batch material, help feed fresh product to the high-speed blades and can facilitate uniform temperature throughout the mix zone. Sidewall and bottom scrapers can also be installed to allow heat transfer between the vessel jacket and batch material.

Shear levels and flow patterns in the PDDM can be fine-tuned because the stirrers and dispersers are independently driven and controlled. Solids are incorporated into viscous bulk material, and stubborn agglomerates can be dispersed regardless of product flow characteristics.

For additional details, phone (800) 243-ROSS or visit

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