| 摘要 |
A method and device for stabilizing the movement of a web in the press section of a paper or board machine in rectilinear transfer of the web, while supported by a fabric (20), from a roll (23) to a second roll (31). With the aid of the web support device (60) according to the invention, the vacuum effect is intensified in critical areas such as in the opening and closing gaps, and also in the edge areas of the web (W). To said areas, greater blowing speeds than earlier are directed from ejection nozzles (61a, 61b, 62a, 62b) and/or to said areas, suction slots (63a, 63b) are connected to intensify the suction. In the wide transverse central area of the web in machine and cross-machine direction, the vacuum effect is limited by arranging a controlled leakage flow (64) or vacuum reduction flows implemented with limited counterblow. In this manner, a vacuum effect greater than before is concentrated to the adjacency of the support rolls (23, 31) of the fabric and to its edge areas. |
