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Abstract

Non-intermeshing two-wing rotors for use in high intensity mixing machines of the batch type provide new sequences and new characteristics of dynamic interactions for achieving advantageously increased mixing effectiveness, improved performance and productivity for such machines. These new rotors are adapted for driving at unequal speed (unsynchronized rotation) or at equal speed (synchronized rotation), and thus they are adapted for retrofitting into existing mixing machines. The optimum results are achieved by turning the two rotors at synchronous speed with a phase angle relationship of about 180.degree. between rotors as shown by various well-known performance criteria. These criteria are plotted, and rating results are tabulated as compared with 0.degree., 90.degree. and 135.degree. phase angle relationships. By virtue of driving the rotors at synchronous speed with the phase angle relationship of about 180.degree., a powerful squeeze-flow mixing action and advantageous pull-down effect on the materials being mixed is produced twice during each cycle of rotation. The mixing chamber of the machine can be loaded with materials to be mixed at a higher 'fill factor' than conventionally used. The ability to use a higher fill factor plus the marked decrease in rejected or unsatisfactory mixed batches achieves a significant increase in productivity with a given size of mixing chamber as compared with prior two-wing rotors.

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