A double planetary mixer is the ideal product for mixing materials with high viscosity. This planetary mixer consists of two blades and a bowl. The blades rotate on their own axes and orbit the bowl on a common axis. Three types of blades used for this double mixer are finger blades, helical blades, and rectangular blades.

The rectangular blades are the most preferred blades for most of the mixing applications. This blade can make both radial and axial motion. Teflon scrapers in this blade ensure complete mixing and efficient transfer of heat. Rectangular blades are best suited for dental composites and other products having viscosities of 1 million centipoises.

The finger blades have top-to-bottom motion and used for mixing for solid substances and products with fibers. The driving system of the double mixer consists of a gear box and a motor, and each blade is driven by gears. Variable speed drives can be used to operate the mixer at different speeds to increase torque even at low speed.

The mixing materials can be added to this mixer either directly on the bowl or through the opening in the top cover. The bowl can be lifted or lowered based on the size of the double planetary mixer. Also, the bowl can be jacketed for heating or cooling circulation and mixer are designed for operating under vacuum or pressure.

After complete mixing, the final mixed product is removed through manual scooping or bottom valve from the mixing bowl. An automatic discharge system is also available for pushing out the materials with high viscous property. The power for operating this mixer ranges between 30 and 50 kWm that depends mainly on the viscosity of the material and the type of blade.

Common applications of the double mixers are metal powders, conductive inks, metallic slurries, fuel cells, metal cleaning compounds, hot melts, and epoxies.