Patent ID: 7441315

Claim:
A nozzle beam having means for setting the working width of a device for generating extremely fine liquid jets for hydrodynamic jet treatment of fibers of a web traveling past the nozzle beam, the nozzle beam comprising an upper part that extends across the working width of the web and a lower part, wherein a pressure chamber that is supplied with pressurized liquid is provided extending the length of the nozzle beam in the upper part, parallel thereto in the lower part a pressure-distribution chamber is provided that opens into a liquid-discharge slot, and a detachable masking strip and a nozzle strip are supported in a liquid-tight manner underneath the liquid-discharge slot, a portion of nozzle discharge holes in the nozzle strip being covered by the masking strip and a portion of nozzle discharge holes in the nozzle strip not being covered by the masking strip, and liquid jets emerge from the nozzle discharge holes in the nozzle strip that are not covered by the masking strip and generate a dense liquid curtain.