Rainanmuodostusmenetelmä paperi- tai kartonkikoneissa

摘要

The invention concerns a web forming method for paper or cardboard machines in which method a pulp suspension stream J is fed through the lip channel 15 in the headbox of the paper machine to the forming wire or forming gap G that is bounded by forming wires 11, 13. A crossdirected velocity v is generated in the pulp suspension stream in the lip channel 15, 15a, 15b of the headbox by feeding more pulp suspension to the one edge region of lip channel 15, 15a, 15b than to the opposite edge region so that the average value of the edge flows essentially corresponds to the average flow in the lip channel. With this cross-directed velocity v together with the uneven distribution δU = SxW = F(Z) (S = velocity in the pulp stream and W = velocity on the wire in the forming region) in the velocity difference that prevails in the Z direction of the web being formed fiber orientation of the web being formed is influenced so that the web fibers are made to turn from the machine direction to the cross direction. <IMAGE>