| 摘要 |
Process for improving planeness of a metal sheet, in which the sheet is stretched between two jaws for a period of time, applying a controlled permanent elongation of greater than 0.5%. Transverse pressure is applied on at least one face of the sheet during at least part of the period time during which stretching is applied with at least one longitudinally movable roll, or with a metal bar clamped to an opposite face of the sheet.
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