| 摘要 |
<p>Procedure in the press section of a paper making machine, wherein the paper or paperboard web coming from a wire is conducted through nips defines by press rolls to traverse the press section in closed conduction so that the web is continually supported being adherent to the surface either of a felt or of a roll. In this procedure the web is detached from the wire and subsequently conducted through at least two press nips dewatering the web, the first of these dewatering press nips being defined by two press rolls having each its own felt, and the second being defined by a smooth surface roll and a suction roll belonging to the first press nip. In the procedure the web is detached from the wire with the aid of a pick-up roll which operates within its own, separate felt loop, and after being detached from the wire the web is adherent to the lower surface of the pick-up felt over a distance substantially corresponding to the suction sector of the pick-up roll. The web is subsequently detached from the pick-up felt by means of a suction transfer roll operating within a felt loop of its own, so that after the last-mentioned point of detachment the web will be supported. from below by the felt of the suction transfer roll, and that the felt of the suction transfer roll carries the web to the first dewatering nip so that the pick-up felt is no longer involved in the first press nip.</p> |
