| 摘要 |
1. Device for stretching a deformable flat film (1) or flat sheet, moving along at least two cylindrical stretching rollers (7, 8), having a circular base and which are of revolution, rotating about their axes XX and YY, the film (1) or sheet moving in a direction perpendicular to the axis of rotation (XX, YY) of the rollers (7, 8), characterised by the fact that the radius R0 of the upstream roller (7) and the radius R1 of the downstream roller (8) are variable over a period of time, the ratio of the angular speeds of rotation N1 /N0 of the rollers (7, 8) being constant.
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