CONTROL OF THE GLASS MELTING PROCESS - RESULTS OF GAS EXTRACTION INVESTIGATIONS

Various parameters influencing the extractable gas content were investigated with the help of improved equipment for high-vacuum extraction experiments. Investigations of a tube melting tank, of the homogeneity of gas distribution in a TV screen and gob and of laboratory melts with different fining agents are described in detail. The different degassing behavior of different glass types are also described. It could be shown that the complex influence of technological and chemical factors determines the amount of physically and chemically dissolved gases. With experience in the analytical procedure, the use of statistical methods of data processing and the knowledge of technological parameters, it is possible to give hints for melting process control.