| 摘要 |
Lightweight flexure-resistant thin metal sheet is produced by passing flexible thin metal sheet between rolls having defined teeth, the teeth having radiused corners so that rows of projections and depressions are formed on both faces of the sheet without damage to the surface material. The projections and depressions are so spaced that lines drawn on the sheet surface between adjacent rows are not rectilinear. The corners of the projections are radiused. |
