| 摘要 |
<p>The web of material is brought to pass through a suction chamber (2) having inlet (12) and outlet (13) for the web of material and one or more air outlets (11), for instance at the bottom thereof, which outlets are connected to a suction source. A means (4) for working the web of material (1) may be provided inside the suction chamber. The inlet (12) and the outlet (13) have substantially the same cross-section area, and the outlet (13) is formed with straight, smooth walls, whereas the inlet is restricted by a limit bar (16, 17) on both sides of the suction chamber wall (18), which limit bars (16, 17) define the cross-section area of the inlet (12) and which have an overhang over the opening (15) of the suction chamber wall (18) of 5-10 mm, and which preferably are provided at a distance from each other of at least about 30 mm.</p> |
