Unlike double-arm or sigma-blade mixers (kneaders/extruders), the Double Planetary Mixer has no packing glands or bearings submerged in the product zone. In addition, the agitators are raised and lowered in/out of the mix by a hydraulic lift. This allows easy access for cleaning between batches. Mix cans are interchangeable for designation to a particular formulation, greatly reducing the risk for cross-contamination between batches.
Sizes range from 1/2-pint to 750 gallons, with footprints considerably less than that of horizontal double-arm kneaders. This product is available as a 40-gallon Double Planetary Mixer with Elevated Discharge System. After mixing, the vessel is easily rolled from the mixer and positioned under the platen of the Discharge System. The vessel is then raised and a receiving container is placed underneath it. As the platen is lowered hydraulically, it pushes down on the batch and an O-ring around the platen wipes the vessel sidewalls clean. Product is forced out through a valve on the bottom of the vessel.
With the use of multiple mix cans, the Double Planetary Mixer is very effective in a semi-continuous process: while one vessel is under the mixer, other vessels in the loop are at the discharge station, being cleaned and/or loaded with raw materials for the next batch. This arrangement maximizes both machine and labor utilization.