Tempering furnaces are creating severe thermal and chemical environmental conditions in order to develop the necessary environment for the glass prior to quenching. The constant evolution of glasses and quality standards, in architectural, automotive and solar industry the search for always more performance became a permanent challenge for the complete furnace engineering. Highest quality standards and long term stability of the treatment, drives the selection of all moving pieces capable to address global quality of the end product. Process controls and maintenance are adapted to the general capability of the rollers.
Long performance should be discussed based on stability of the furnace compounds over the expected periods of service. Changes in rollers physical and chemical characteristics have been demonstrated through viscoplastic analysis and high temperature mechanical environment to create the more stable conditions for driving the glass for maximum control of the tempering in different glass configuration. Association of mechanical driving systems and ceramic stability through the furnace service are conducting to the roll dynamic rigidity while absorbing required operational changes generated by today market demand. Weibull analysis, mechanical torque and viscoelasticity of the roll function have been investigated in real field conditions over a year.