| 摘要 |
<p>The invention concerns a method and a system for regulation of the nip profile in a nip (N) formed by a roll (10) adjustable in zones and by backup roll (20). The nip (N) is loaded adjustably by means of hydraulic glide shoes (13) in the roll (10) adjustable in zones, and the cross-direction profile of the web (W) is measured constantly after the nip (N), and the differential profile between the measured cross-direction profile and the target cross-direction profile is computed, which differential profile is used in a closed regulation circuit as a regulation parameter so as to regulate the nip profile to the desired form. The regulation parameter that represents the differential profile is fed in the closed regulation circuit into an optimizing part (60), which contains an optimizing routine and which contains the data on the profile responses, cross-effects and physical limitations of the actuators in the roll (10) adjustable in zones. Based on the differential profile and while taking into account said cross-effects and physical limitations, the optimizing routine computes new set values in order to minimize the overall error of the cross-direction profile and the differential profile. The set values are fed as regulation parameters to the regulation apparatuses that regulate the nip profile so as to correct the cross-direction profile.</p> |
