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Annealing Ovens: Thermal Gradients and the Shape of a Cooling Curve
An annealing lehr holds newly formed glass above its strain point and then walks the temperature down on a controlled curve. The purpose is not to cool the piece โ air would do that โ but to give the interior and the surface time to arrive at the same temperature together. Where they do not, the mismatch is stored in the object as residual stress, and the piece will fail later, usually at the thickest section, often with no warning at all. A good curve is therefore mostly patience: a long soak, a slow descent through the transformation range, and a final stretch where the rate can safely double.
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