By Charles H. Drummond III
This ebook is a state of the art selection of contemporary papers on glass difficulties as offered on the 68th convention on Glass difficulties on the Ohio country collage. themes contain production, glass melters, combustion, refractories, and new advancements.
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Extra info for 68th Conference on Glass Problems
6. IR Linescanner in Glass Tempering Application CHALLENGES OF TEMPERING LOW-EMISSIVITY GLASS While the process to measure temperature in the glass tempering process has been well proven for standard flat glass, low-e glass presents some unique challenges. Many of the ovens used in the tempering process utilize IR energy as a means to heat the glass. Since the low-e coating is specifically designed to reflect this radiation, low-e glass will not heat up at the same rate as non-coated glass. This means that process settings need to be established and maintained for each type of low-e glass processed.
The model based controller: • Thinks of the forehearth as a unit, not as individual zones • Prioritizes temperature readings to determine the most important temperatures • Allows zones to work together rather than fight each other Equalizing Figure 6; Typical forehearth and 9 point grid MASS FLOW TEMPERATURE CONTROL The mass flow temperature (MFT) is made up of an average of nine equalizer triplex temperature values. Each of these nine temperatures is given a priority, where some values are more important than others.
68th Conference on Glass Problems ■ 45 Applications and Challenges for Infrared Temperature Measurement in Glass Manufacturing The increased use of low-emissivity glass in the building industry has brought with it an increase in the challenges associated with its tempering. The system described in this paper is the first known attempt to address these problems and the only known commercially available system of its type. While the system has some 'limitations in that in cannot function on glass where the emissivity is approaching zero, it has proven to be a useful tool to increase throughput, improve throughput and reduce cost.
68th Conference on Glass Problems by Charles H. Drummond III