The annealing lehr for float glass production line heats the glass to the upper limit of the annealing temperature range. After a period of thermal retardation, the permanent stress in glass is eliminated. Then the glass is cooled down at an appropriate rate to the lower limit of the annealing temperature range, so it will not produce a new permanent inherent stress. From what is mentioned above, we know there is a slow cooling process involved in annealing.
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