The prloblem of setting the best operating conditions of a co-rotating twin-screw extruder is solved using an optimization approach based on Genetic Algorithms. Two possibilities are considered: i) the maximization of an objective function, ii) the simultaneous optimization of the individual criteria and the useof Pareto plots. The flow conditions inside the machine are simulated using the Ludovic software. Various practical case studied are discussed, among them a extrusion application. Generally, the methodology is sensitive to the influence of the main process criteria and provides solutions that are apparently sound.
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