Flow-optimized edge treatment

A method of using a format control unit of a Fourdrinier wire machine for producing a web of fibrous material, the method comprising the steps of:

• providing that the Fourdrinier machine is configured for producing the web of fibrous material from at least one fibrous stock suspension and that the format control unit includes a flow body, which includes a flow dividing device which is configured for separating an edge strip from a fibrous stock suspension stream, in a region of a flow division the flow dividing device including a rounded edge with a curvature radius greater than 2 mm, the rounded edge being round when viewing a cross-section—of the rounded edge—that is perpendicular to a machine direction of the Fourdrinier wire machine, the Fourdrinier wire machine—and thus also the flow body—having the machine direction and a cross-machine direction and lying in a coordinate system having an X-axis, a Y-axis, and a Z-axis, the X-axis extending in the machine direction, the Y-axis extending in the cross-machine direction, and the Z-axis extending vertically, the cross-section associated with the rounded edge lying in a Z-Y plane;
• revolving at least a Fourdrinier wire-which is continuous-in a circumferential direction;
• applying, by way of a headbox nozzle of a headbox, the at least one fibrous suspension formed as the fibrous stock suspension stream over a width of the Fourdrinier wire to form the web of fibrous material;
• and
• mounting two of the format control unit on two opposite sides parallel relative to web center of the Fourdrinier wire, the two of the format control unit being configured for separating the edge strip from the fibrous stock suspension stream in a region of the fibrous stock suspension stream and from an edge of the Fourdrinier wire, the flow dividing device of the flow body being arranged at an angle (α′) in a range from 10° to 45° relative to a plane of the Fourdrinier wire machine (x-y axis).