Optimization of Rubber Mixing in Internal Mixers

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Abstract
Conventional rotor geometries of both the tangential and intermeshing systems can be improved in regard to working volume, feeding, mixing result, and milder temperature-rise. However it is necessary to consider both systems to supplement each other: (1) The tangential system is primarily for high machine efficiency, fast feeding, fast discharge and fast incorporation, i.e., for short mixing cycles and for multi-stage mixing. (2) The intermeshing system is for problems with distribution and temperature and for the increased theoretical output with longer mixing cycles by decreasing the number of mixing stages. Theoretical and experimental analysis of the influence of various operating parameters makes it possible to produce an optimum batch. The end result is process control which improves batch-to-batch uniformity.

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