Modeling and Control of a Twin Screw Extruder for the Production fo Modified ThermoPlastic Volcanizates

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Blending of plastic and rubber with a cross-linking or grafting agent to manufacture new modified polymers such as TPVs (thermoplastic vulcanizates) and grafted polymers, by reactive extrusion, is a highly non-linear and complex process. High degree of complexity is mainly due to the chemical reactivity and selectivity, sensitivity to the equipment configuration, as well as the processing conditions. From the process control point of view, the reactive extrusion represents a multi-variable non-linear system. A simple control algorithm, such as a PID (proportional, integral and differential) controller is not sufficient for controlling such a highly non-linear process. At Lambton College, the unique Advanced Material Engineering Research (AMER) laboratory is equipped with a pilot scale extrusion equipment. In addition to this laboratory, the Advanced Process Control and Simulation (APCS) Research laboratory offers real-time instrumentation and distributed control system (DCS), which are ideal for implementing advanced control methodologies.