| 摘要 |
A method and apparatus for unwinding a vertically oriented roll (10) of web material (11) is disclosed. The roll (10) comprises a lower surface, an uppe r surface and a circumferential surface. The apparatus comprises: at least one drive element adapted to rotate the vertically oriented roll (10), a sensor adapted to measure a tension of the web, and a controller adapted to adjust a speed of the web according to the tension of the web. The method comprises steps of rotating the roll, determining a desired web tension, and adjusting the speed of the roll according to the desired web tension.
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