| 摘要 |
<p>The invention concerns a method in the calendering of a paper or of an equivalent web material. In the calender, the web material (W) to be calendered is passed through nips (N1...N9) formed by a variable-crown upper roll (13a), a variable-crown lower roll (14a), and by two or more intermediate rolls (15a...22a) arranged between said upper and lower rolls (13a, 14a). The rolls (13a...22a) are arranged as a substantially vertical stack of rolls (12a). As the intermediate rolls (15a...22a), such rolls are used in which the form of the natural deflection line produced by their own gravity is substantially equal. The nip load produced by the masses of the intermediate rolls (15a...22a) and of the auxiliary equipment (167a) related to same is relieved substantially completely in the method, and an adjustable load is applied to the calendering nips (N1...N9) by means of the variable-crown upper or lower roll (13a, 14a) and/or by means of an external load (143a) applied to the upper or lower roll. The invention also concerns a calender that makes use of the method.</p> |
