A new method of obtaining open loop responses of a three barrel injection moulding machine is investigated. The method involves limiting the amount of heat transfer between adjacent zones by using a controller to create an artificial adi-abatic wall. Since most barrel zones are run at or near to the same temperature, the system identified by the adiabatic wall method better represents industrial operating conditions. A predictive controller was designed to handle the dynamics of the adiabatic system and compared to a conventionally-tuned controller.
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