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By III Charles H. Drummond

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7%, - 30 much more than the entire tolerance range for the gob weight would allow. 1 wt% N+O is clearly noticed. If the use of recycled cullet from old TV sets is considered, the material will have to be analyzed very thoroughly. For some components, such as color components, the analytical technique is not sufficiently developed to be able to guarantee the quality of recycled cullet as fit for production of TV panel glass. With all these objections against the use of cullet from the market in TV panel glass, it should be noted as well that bad cullet creates cullet in the form of rejected products.

Roosmalen, “Verification of 3D mathematical simulation with measured temperature profiles during furnace operation,” Glasrech. Berichte 68(32,55-62 (1995). 21. J. Chmelar, M. Novackova, I. Safarik, and P. Budik, “Mathematical modeling of furnace design”; in Proceedings of the Fourth International Seminar on Mathematical Simulation in Glass Melting, 1997, Horni Becva, Czech Republic. 4. 140-153. 22. W. Muschick and E. Muysenberg, “Round robin for glass tank models, Report of the International Commission on Glass (ICG), Technical committee 21 ‘Modelling of glass melts,”’ Glasrech.

However, in the case of increased pull rates with the associated much greater economic benefit, these payback period targets can normally be achieved. But the ability to realize increased pull rates can, and generally is, limited by other factors. Even in cases where increased pull can be realized, the glassmaker is often reluctant to enter into a long-term investment based on increased production in the face of uncertain market conditions. If compliance with the strictest environmental regulations for all the pollutants is achieved with the preheating system, the glassmaker then realizes the avoided cost of installation of an expensive gas cleaning plant.

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