DE-WATERING DEVICE FOR DE-WATERING A FIBROUS MATERIAL WEB, METHOD FOR DE-WATERING A FIBROUS MATERIAL WEB, AND MACHINE FOR PRODUCING A FIBROUS MATERIAL WEB

摘要

The invention relates to a de-watering device for de-watering a fibrous material web (1), in particular a paper, paperboard, pulp, or tissue web. The device comprises a suction roll (7) having a region (8) subject to suction which can have one or more suction zones (8a), and which is connected to at least one vacuum system. In addition, a first covering (2) is provided in the region of the region (8) subject to suction between the fibrous material web (1) and the suction roll (7). The de-watering device is characterised in that it comprises a diffuser layer (3) arranged at least in the region of the region (8) subject to suction between the fibrous material web (1) and the surface of the suction roll (7).