HEADBOX FOR A MACHINE FOR PRODUCING A FIBROUS MATERIAL WEB, AND MACHINE

摘要

The invention relates to a headbox (1) for a machine for producing a fibrous material web (3), in particular a paper, cardboard or tissue web (3), from at least one fibrous material suspension (2), comprising a feeding device (4, 5) feeding the at least one fibrous material suspension (2), a perforated distribution pipe plate (6), which is arranged immediately downstream of the feeding device (4, 5) in the flow direction (R) of the at least one fibrous material suspension (2) and which comprises a plurality of flow channels (7) arranged in rows (Z; Z.1 to Z.3) and columns (S; S.1 to S.4), an intermediate channel (8), which is arranged immediately downstream of the perforated distribution pipe plate (6) in the flow direction (R) of the at least one fibrous material suspension (2) and which extends in the width direction (B) of the headbox (1) and comprises two walls (9.1, 9.2) preferably having the width of the machine, a turbulence generating means (10), which is arranged immediately downstream of the intermediate channel (8) in the flow direction (R) of the at least one fibrous material suspension (2) and which has a plurality of flow channels (11) arranged in rows (Z; Z.1 to Z.3) and in columns (S; S.1 to S.4), and a headbox nozzle (13), which is arranged immediately downstream of the turbulence generating means (10) in the flow direction (R) of the at least one fibrous material suspension (2) and which has a nozzle gap (14), wherein the feeding device (4, 5), the perforated distribution pipe plate (6) and the intermediate channel (8) are arranged in a first alignment plane (AE.1), and the turbulence generating means (10) and the headbox nozzle (13) are arranged in a second alignment plane (AE.2), and wherein the two alignment planes (AE.1, AE.2) form an angle (a) in the range of >90 and < 180°, preferably = 100 and = 170°, in particular of = 110 and = 160°. The headbox (1) according to the invention is characterized in that, on at least on one wall (9.2), which preferably has the width of the machine, of the intermediate channel (8), a plurality of means (17, 17.1), which are spaced apart from each other in the width direction (B) of the head box (1), are arranged for the, preferably controlled, metered addition of a fluid (18) in partial fluid flows (18.T) to the at least one fibrous material suspension (2), each individual means (17, 17.1) for the, preferably controlled, metered addition of the fluid (18) in partial fluid flows (18.T) to the at least one fibrous material suspension comprises a plurality of metering channels (19), which have a metering channel opening (19.1) and metering channel center line (19.M) and join at different heights, and the individual metering channel opening (19.1) of a metering channel (19) of the means (17, 17.1) for the preferably controlled metered addition of the fluid (18) in partial fluid streams (18.T) into the at least one fibrous material suspension (2) are aligned such that the metering channel center line (19.M) of said metering channel (19) impinges on the turbulence generating means (10) when forming an impingement point (AP).