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Investigations on glass-to-mold sticking in the hot forming process

: Rieser, D.; Spieß, G.; Manns, P.

Gan, F.:
International Symposium on Glass - In conjunction with the Annual Meeting of the International Commission on Glass 2005. Proceedings : Shanghai, China, 10-14 April 2005
Amsterdam: Elsevier, 2008 (Journal of non-crystalline solids 354.2008, Nr.12-13)
International Symposium on Glass (ISG) <2005, Shanghai>
International Commission of Glass (Annual Meeting ICG) <2005, Shanghai>
Conference Paper, Journal Article
Fraunhofer IWM ()
measurement technique; mechanical property; modeling and simulation; oxide glasses; surface and interface; thermal property; viscosity and relaxation

The sticking behavior of various mold materials and coatings for hot glass melt forming processes, like, e.g. glass container manufacturing, was investigated using a new testing procedure. The mold material specimens under test were subjected to frequent contact with hot viscous glass gobs in a pressing process with presetting well defined non-isothermal pressing parameters to simulate industrial working conditions. Three different glass compositions were used in this investigation, soda-lime silicate glass, lead crystal glass, and borosilicate glass. The sticking characteristics of the tested mold materials and coatings were described by two quantities, a lower and an upper sticking temperature, which are specific for each mold material and type of glass in the non-isothermal pressing process. The lower sticking temperatures of uncoated mold materials were found to depend monotonically on the thermal effusivity (heat penetration coefficient) of the bulk mold materials. All of the coating materials applied to various substrate mold materials were found to reduce the lower sticking temperature as compared to the uncoated materials. Most of the coating materials were found to reduce also the upper sticking temperature.