| 主权项 |
1. A method for ceramizing green glass, in particular in the form of a continuous green glass ribbon or individual green glass plates, the method comprising:
conveying the green glass directly on rollers at least during a volume crystallization, wherein the entire ceramization process of at least one region of the green glass lasts between 0.5 and 4 hours, the at least one region being exposed to a maximum temperature between 750 and 1250° C. for 5 to 60 minutes during the volume crystallization, carrying out the volume crystallization in a temperature range between 750 and 1250° C., the temperatures of the upper and lower faces of the at least one ceramizing region of the green glass being continuously measured and the heating being controlled using this information based on target values by a measuring and control apparatus, and moving the at least one region forward on rollers during the volume crystallization at an advancing rate ranging between 0.2 and 10 m/min., wherein the viscosity of the at least one region of the green glass during the volume crystallization ranges, at least intermittently, between 107 and 1011 dPa·s by adjusting the advancing rate and the temperature and wherein the temperature and the advancing rate are controlled so that the following applies with respect to the distance xRoller of the roller axes:xRoller5≦360*(Ra*tPane2)/(ρ*g)*v*η, where Ra is the maximum glass deflection, tPane is the glass thickness, ρ is the glass density, g is the acceleration due to gravity, v is the advancing rate and η is the minimum viscosity of the glass. |
