Viscous materials, mixing planetary

Double- and Triple-Shaft Mixers The planetary mixer is an example of a double shaft mixer. However, many different combinations of mixing actions can be achieved with multi-shaft mixers. One variation on planetary motion involves replacing one anchor-style impeller with a high-shear impeller similar to the one shown in Fig. 18-47. The high-shear mixer can be used to incorporate powdered material effectively or create a stable emulsion leading to a final batch of viscous paste or fluid. 

A number of mixing system designs are used for mixing of viscous fluids in laminar regime. They include (1) close-clearance impellers, (2) planetary impellers that move throughout the tank, and (3) fixed impellers in tanks that move to expose the material to the impeller. All of these systems generate the necessary three dimensional flows required for mixing. 

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