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By III Charles H. Drummond

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In addition, it is easier to compensate for variations in pull and the accompanying drops in temperature along the critical current path. In the case of special glasses such as borosilicate compositions, which require very high fining temperatures, this concept can be used to produce excellent quality. The furnace superstructure temperatures can be decreased in comparison with conventional furnaces, while the fining quality remains the same. Boron volatilization is reduced, which leads to improved glass homogeneity.

Conradt, “Alternative uses of recycled cullet: Problematical impurities and alternative forming”; pp. 31-37 in Proceedings of the 5th ESG Conference: Glass Science and Technologyfor the 21st Century. Prague, Czech Republic, June 1999. -K. Gliising and R. Conradt, “Ceramic and metal impurities in recycled cullet for flint glass melting”; presented at ICG 2000: Glass in the new millennium: Challenges and break-through technologies. Amsterdam, The Netherlands, May 2000. H. Hessenkemper, “Instabile productionsbedingungen in der Glasindustrie - Ursachen und Steuerungsmoglichkeiten” (in German); pp.

Flowing gases are in direct contact with this batch surface. As a result of the downward batch movement, fresh batch material is constantly being exposed to the hot gases. This direct contact of hot gases with the continuously changing batch surface results in heat transfer rates many times greater than that achieved by indirect heat transfer. Also, this direct contact causes chemically reactive batch constituents (soda ash) to react with SO, in the gases, forming sodium sulfite and sodium sulfate solid products that remain in the batch.

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61st Conference on Glass Problems by III Charles H. Drummond

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