Patent ID: 8303774

Claim:
A headbox for a machine for producing a fibrous web, the fibrous web being a paper cardboard web, from at least one fibrous stock suspension, the head box comprising: a feed device for feeding at least one fibrous stock suspension; a perforated distribution pipe plate arranged immediately downstream from said feed device and having a first set of channels arranged in a first set of rows and columns, said perforated distribution pipe plate having a length ≧0.5·√{square root over (partition)} area, said partition area being a ratio of a downstream total area of said perforated distribution pipe plate and a total number of said first set of channels of said perforated distribution pipe plate, said first set of channels arranged in said first set of rows and columns of said perforated distribution pipe include a diffuser at least in some areas of said first set of channels; an intermediate channel arranged downstream from said perforated distribution pipe and extending over a width of the headbox, said intermediate channel including a plurality of apparatuses for dosing a fluid in a plurality of partial fluid streams into the at least one fibrous stock suspension, the apparatuses being spaced apart from each other in a width direction of the headbox, said apparatuses each having a plurality of dosing channels having a respective dosing channel opening and discharging at a plurality of different levels, said plurality of dosing channels being connected to a common supply channel; a turbulence generator arranged downstream from said feed device, said turbulence generator having a second set of flow channels arranged in a second set of rows and columns; and a headbox nozzle directly contiguous with said turbulence generator, said headbox nozzle having a nozzle gap.