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Melt temperature in the injection molding process directly affects the quality of the molded plastic product. The injection molding process is a periodic dynamic process. Many factors affect the barrel melt temperature, so precise control of the melt temperature is difficult. This paper introduces this industrial problem and presents a combined strategy using a feedback controller and an iterative learning controller to resolve the problem. Results show that this method has a high dynamic control accuracy and improves molded part mass repeat accuracy.

Melt temperature dynamic control strategy of injection molding machine based on variable structure control and iterative learning control