| 摘要 |
The invention relates to a sheet-forming system for a machine for producing a multilayer fibrous material web, comprising a multilayer headbox having a headbox nozzle, which has at least two nozzle chambers that are separated from one another by at least one separating wedge, and further comprising a gap former, which is connected directly downstream of the multilayer headbox and has two continuous revolving screens, the first screen of which runs over a circumferential area of a forming roll and the second screen of which runs over a circumferential area of a breast roll and then runs onto the first screen in the area of the forming roll to form a wedge-shaped material inlet gap. The sheet-forming system according to the invention is characterized in that the separating wedge has a separating wedge protrusion in a range of 0.05 to 3.0 of the largest single gap width of the at least two nozzle chambers; the separating wedge comprises two separating wedge areas, each having one separating wedge angle, an upstream separating wedge starting area and a downstream separating wedge ending area; the two separating wedge angles of the two separating wedge areas assume different angle values, wherein the separating wedge starting angle of the upstream separating wedge initial area assumes a greater angle value than the separating wedge ending angle of the downstream separating wedge end area, and at least one separating wedge surface of the separating wedge is provided as a nonplanar transitional area between the two separating wedge areas of the separating wedge; the fibrous material suspension free jet formed from at least two fibrous material suspension streams has a free jet length in the range of 100 to 500 mm, and the forming roll has a diameter in the range of 1,200 to 2,500 mm. |
