Plastic extrusion is a well-established method widely used in the polymer processing industry. Extruder typically is composed a large barrel divided into several temperature zones. The control system of extruder is designed by PID control theory. This method deals with independently the barrel which constructs a cylinder. For this reason, this temperature control system sets up the temperature interference between barrels. Then, we tried an improvement of the control system using H∞ control theory, decoupled control theory, and disturbance observer.
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