Patent ID: 8221590

Claim:
A headbox for a machine for producing a web of fibrous material from at least one fibrous stock suspension, the web being one of a paper web and a cardboard web, said headbox comprising: a feed device feeding the at least one fibrous stock suspension; a perforated distribution pipe plate arranged immediately downstream from said feed device and having a plurality of channels arranged in a plurality of rows and a plurality of columns; an intermediate channel arranged downstream from said perforated distribution pipe plate, extending over a width of the headbox, and having a plurality of devices for dosing of a fluid in a plurality of partial fluid streams to the at least one fibrous stock suspension in at least one of an adjustable and a controllable manner, said intermediate channel including a common supply channel, said plurality of devices being spaced apart from each other in a width direction of the headbox, said plurality of devices individually including a plurality of dosing channels, said plurality of dosing channels respectively including an outlet side, a dosing channel opening on said outlet side, and a dosing channel length, said plurality of dosing channels discharging at different levels and being connected to said common supply channel, said dosing channel length of each of said plurality of dosing channels being 1.5 times longer than said dosing channel opening of said plurality of dosing channels on said outlet side; a turbulence generator downstream from said intermediate channel and having a plurality of flow channels arranged in a plurality of rows and a plurality of columns, a distance from said dosing channel opening of each of said plurality of dosing channels on said outlet side to said turbulence generator being in a range of 0 to 50 mm; and a headbox nozzle including a nozzle gap, said headbox nozzle being located immediately adjacent to said turbulence generator.