| 摘要 |
PCT No. PCT/FI88/00155 Sec. 371 Date May 3, 1989 Sec. 102(e) Date May 3, 1989 PCT Filed Sep. 23, 1988 PCT Pub. No. WO89/02953 PCT Pub. Date Apr. 6, 1989.An arrangement of pressure nozzles intended for the treatment of webs comprises a nozzle box. The nozzle box has a carrying face (16) placed facing the web, two nozzle slots (17,18) that blow towards each other being provided in connection with the carrying face, these nozzle slots being placed in the outer part of the space defined by the inner walls (14,15) and the outer walls (20,21) of the nozzle box. The arrangement of nozzles is asymmetric relative to the perpendicular center plane (A-A) of its pressurized carrying face (16). The arrangement of nozzles has a first nozzle slot (18), which is placed relative the carrying face (16) in such a way that the gas jet (v1) blown out of the nozzle slot follows and remains in contact with the curved carrying face (16) up to the area between the nozzle slots (17,18). The arrangement of nozzles includes a second nozzle slot (17), which is placed within the area of the edge of the curved guide face (14,R2) placed in its connection or, in the gas flow direction (v2), before the edge. The ratio of the width of the second nozzle slot (18) to the curve radius (R2) of its guide face (14) is chosen so, with the flow rates (v2) of the second nozzle generally occurring, that the gas flow is separated from the curved (R2) guide face of the second nozzle, before the carrying face area proper between the first and the second nozzle slot (17,18), or in the edge portion of this area.
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