Rotor Designs: Pleasant Surprises

For the majority of the 100 years that the internal intensive mixer has been around, the rubber industry used rotors that were designed for general purpose mixing, from master batch through final mixing and anything in between.  In recent years, some rotors have been designed for specific types of mixing, such as mixing finals or silica master batches.  What is noteworthy of these designs is that they have been found to be excellent rotors for other types of mixing as well.  Two of these “pleasant surprises” in rotor design will be highlighted and reviewed.