| 摘要 |
PCT No. PCT/FI81/00018 Sec. 371 Date Nov. 3, 1981 Sec. 102(e) Date Nov. 3, 1981 PCT Filed Mar. 13, 1981 PCT Pub. No. WO81/02753 PCT Pub. Date Oct. 1, 1981.A procedure for dewatering and detaching a paper web from the second former wire. The composite of first and second wire and interposed web is contacted with a first cover part of a special suction box. A roll guiding the second wire, pressing from the side of the latter deflects its run. This pressure plus centrifugal force, and the differential pressure arising from the suction box, dewater the web. The second wire is separated to follow along with the guide roll, while web and first wire are acted on by the suction box vacuum. The first wire is then contacted with a second cover part of the suction box. A twin-wire former is also disclosed, featuring within its carrying wire loop, on its twin-wire run, a rotating forming roll deflecting the composite of wires and web as it laps a given sector of said forming roll. A special suction box at the ultimate end of the wires has a bipartite cover its parts angulated against each other and preferably planar. |
