By Charles H. Drummond III

This publication is a cutting-edge selection of contemporary papers on glass difficulties as provided on the 68th convention on Glass difficulties on the Ohio nation college. subject matters comprise production, glass melters, combustion, refractories, and new advancements.

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Extra resources for 68th Conference on Glass Problems

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It has also been realized that the mechanics in the feeder have a significant impact on the gob temperature. For example, adjustments to the shearing and gobbing process have shown to change the overall gob temperature and the temperature relationship amongst the gobs from the different orifices. It has also been observed that the gob temperature commonly oscillates at the tube rotation frequency. 4» & «$Λ QT ^ $r

CONTAINER DEFECTS AND GOB TEMPERATURE The presence of container defects was compared to gob temperature on a continuous job, amber glass container line with PID control. It was observed that changes as small as a few degrees in gob temperature impacted the presence of seal surface and split finish defects. Figure 5 shows the normalized quantity of containers with either defect compared to the gob temperature. Because the forehearth w;as controlled with conventional PID, the gob temperature varied significantly as explained above.

Once the optimum process is modeled, model based control • Predicts control actions required to drive the glass temperature to setpoint quickly without overshoot. • Continuously adapts to process and production changes automatically for better control without loop tuning. • Models feed forward inputs and updates control actions to quickly stabilize temperature variation. CONTROLLING THE FOREHEARTH AS A UNIT Typically, the 9-point grid is monitored to determine temperature stability in the forehearth.

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68th Conference on Glass Problems by Charles H. Drummond III

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