The stress generated by the glass during cooling is divided into: end face stress (thickness direction) and plane stress (width direction); these stresses include: temporary stress and permanent stress.
1. End face stress: It is a stress caused by a temperature gradient inevitably occurring in the thickness direction during cooling.
2. Plane stress: is the stress caused by uneven temperature distribution in the width direction during cooling.
3. Temporary stress: A stress that exists in the glass with the presence of a temperature gradient and disappears as the temperature gradient disappears.
4. Permanent stress: residual stress after the temperature gradient in the glass disappears. Permanent stress due to structural non-uniformity due to non-uniform chemical composition of the glass is also a permanent stress. This stress is obviously not eliminated by annealing.
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