Patent ID: 7653460

Claim:
A controller of a molding system, the molding system having: (a) an extruder, (b) extruder heaters being coupled to the extruder, (c) a hot runner forming a melt passageway, the hot runner having: (i) a zone, the melt passageway passing through the zone, and (ii) a thermal sensor being placed proximate of the zone, (d) a machine nozzle connecting the extruder to the hot runner, the controller for being operatively coupled to the thermal sensor, the controller comprising: a controller-usable medium embodying instructions being executable by the controller, the controller operatively couplable to the molding system, the instructions including: executable instructions being configured to direct the controller to control a thermal condition of the extruder by controlling the extruder heaters; executable instructions being configured to direct the controller to determine whether a change in the thermal condition of the extruder is required based on a thermal condition of the zone of the hot runner, the thermal condition of the zone being measured by way of the thermal sensor; executable instructions being configured to direct the controller to adjust the threshold of the extruder heaters based on a non-extruder sensor that is positioned away from the extruder but positioned proximate to the melt passageway, and the melt passageway is also positioned external of the extruder, the non-extruder sensor is positioned closer to the molding material so that the non-extruder sensor is not negatively influenced by heat of the extruder, and the non-extruder sensor detects the temperature reading of the molten magnesium alloy; and executable instructions being configured to direct the controller to use the non-extruder sensor in a closed loop feedback control schema to adjust the heat of the extruder.