| 摘要 |
Glass or glass ceramic plates with elevated thermal resistance and process for their production. After cooling, the glass or glass ceramic plates are subjected to zone annealing, whereby the plates are divided into two zones in which annealing is done at respectively different temperatures, and whereby the zones with the elevated temperature correspond, during annealing, to the sub-areas of the finished glass or glass ceramic plates in which compression stress builds up after uneven heating corresponding to the respective specific application of the glass or glass ceramic plates. The glass or glass ceramic plates that are obtained are thus characterized in that they are divided into two sub-areas, whereby one sub-area exhibits structural compression and the other sub-area exhibits compression stress. Glass or glass ceramic plates that are resistant to breakage that is caused by uneven heating result.
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