Method and device in the regulation of a headbox

Details Method and device in the regulation of a headbox Method and device in the regulation of a headbox

D - Textiles, Paper

21

F

D21F 1/02 (2006.01) D21F 1/06 (2006.01) D21F 1/08 (2006.01)

Patent

CA 2127309

ABSTRACT A method and device in the regulation of the headbox. The headbox includes a pulp inlet header, after the pulp inlet header, seen in the pulp flow direction, a distributor manifold whose pipes are opened into an intermediate chamber. The headbox comprises an attenuation chamber placed in connection with the intermediate chamber and, after the intermediate chamber, a turbulence generator having tubes which are opened, at their outlet end, into a discharge duct and, at their inlet end, into the intermediate chamber. In the method, into different positions along the width of the headbox, a pulp suspension flow is introduced, the concentration of this flow is adjustable by combining two component flows. In the method, in the regulation of the concentration of the flow passed into the pulp suspension, two component flows are combined by into the pulp suspension flow introducing an additional flow. The mixing ratio of the combined flow is regulated by adjusting the additional component flow. In the method, the additional component flow is passed into the pulp flow taken out of the inlet header. 37

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