Patent ID: 6207018
Filing Date: 2001-03-27
Classification: D21F,D21G,G01G,Y10S

Abstract:
A process for controlling a headbox of a paper machine, comprising:determining a weight basis cross-sectional profile of a paper web outside the headbox at a sensing rate of .DELTA.T;comparing the weight basis cross-sectional profile with a first set point stored in a control device;actuating a final control element in a section of the headbox in the event of variation between the weight basis cross-sectional profile and the first set point;determining a pulp slurry's pulp consistency at an arbitrary location in the headbox at a sensing rate of .DELTA.t;comparing the pulp slurry's pulp consistency with a second set point;actuating the final control element in a section of the headbox in the event of variation between the pulp slurry's pulp consistency and the second set point; andutilizing separate feed line pulp consistency sensors which enable stabilized longitudinal profile variations in each section of the paper web.