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不良・失敗
warp
Japanese: 反り
A defect in which the board does not cool evenly and warps into an arch. This is caused by unevenness in the shelf boards and variations in thickness.
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Warping is a defect in which flat glass bends into an arched shape because it does not cool uniformly. This is caused by temperature variations on the shelf, differences in glass thickness, and differences in cooling rates between the top and bottom surfaces.
Preventing this issue involves maintaining a uniform temperature inside the oven and keeping the shelves level.
This entry is written in Japanese by Rei Chikaoka and translated for readers outside Japan. If something reads oddly, the original is the source of truth.