Steam blowing box for pressurization of e.g. paper material in paper manufacturing and/or finishing machine, has multiple nozzles including openings with cross-sections that are downsized in blow direction

摘要

The box (2) has a pressure chamber (3) staying in connection with multiple nozzles (4) arranged for a fibrous sheet material (1) e.g. paper material, where the pressure chamber is filled with steam. Openings of the nozzles include cross-sections that are downsized in a blow direction. Pressure of the steam in the pressure chamber lies between 0.2 and 0.5 bars. A distance between each nozzle to the fibrous sheet material lies between 15 and 30 millimeters. A number of nozzles per meter width of the fibrous sheet material lies between 30 and 200.