The invention relates to a headbox (1) for a machine for producing a fibrous web (3), especially a paper or cardboard web, from at least one fiber suspension (2), comprising a feed device (4, 5) feeding the at least one fiber suspension (2), a perforated distribution pipe plate (6) arranged immediately downstream thereof and having a plurality of channels (7) arranged in lines (Z) and columns (S), an intermediate channel (8) arranged downstream thereof, extending over the width (B) of the headbox (1) and having a plurality of means (9) for dosing a fluid (10) in partial fluid streams (10.T) to the at least one fiber suspension (2) in a preferably adjustable/controlled manner, the means (9) being spaced apart from each other in the width direction of the headbox (1) and the individual means (9; 9.1) comprising a plurality of dosing channels (11) having respective dosing channel openings (11.1) on the outlet side and a dosing channel length (11.L), arriving at different levels and being connected to a common supply channel (12). The headbox (1) according to the invention is characterized in that the dosing channel length (11.L) of the dosing channel (11) is 1.5 times longer than the dosing channel opening (11.D) of the dosing channel (11) on the outlet side and in that the distance (A) of the dosing channel opening (11.1) of the dosing channel (11) on the outlet side to the turbulence generator (13) ranges from 0 to 50 mm.
展开▼
