| 摘要 |
<p>The invention relates to a method for controlling the tension of paper or a similar web material (W) on a roll stack (1), for example, a calender, the roll stack (1) comprising an upper roll or first roll (4), a lower roll or last roll (5), and intermediate rolls (2, 3). The intermediate rolls are arranged between the upper roll or first roll (4) and the lower roll or last roll (5), the said rolls (2, 3, 4, 5) forming a roll stack (1). The web material (W) is led through the nips (n) formed by the roll stack (1). After each nip (n) the web material (W) is detached from the surface of the roll (2, 3, 4, 5) by means of a leading roll. The desired tension of the web material (W) is maintained and/or adjusted by adjusting the moments of the roll (2, 3, 4, 5) drives (9) on the basis of a comparison between a determined tension level and a reference tension level, or by adjusting the moments of the roll (2, 3, 4, 5) drives (9) on the basis of a comparison between a determined track draw and a reference level of a track draw. The i</p> |
