An apparatus for producing a fibrous web

An apparatus (48) for producing a fibrous web, in particular paper or board web, comprising providing a a suspension beam (18) headbox (24) having a headbox (10), the nozzle chamber (12) through a lower lip (14) and one of these opposite upper lip (16) and two opposing side walls (34, 36) is limited and for producing a suspension jet (18) has an outlet gap (20). Here, the headbox nozzle (10) that, measured at a change of the perpendicular to the inner side of the lower lip (14) is adapted to exit the gap height (s) by an amount of 1 mm, the beam firing angle (β) between the suspension beam (18) and the inside of the lower lip (14) by more than 0.1 ° change. It is a means (38) for feeding and / or drawing off of a respective predetermined volume flow into and out of the two lateral edge areas (40, 42) provided the nozzle chamber (12). For the maximum constant the Strahlauftreffgeometrie means (48) for repositioning of the headbox (24) in dependence on the respective outlet gap height (s) is provided.