Patent ID: 6203665
Filing Date: 2001-03-20
Classification: D21F,Y10S

Abstract:
A process for setting a uniform characteristic cross-direction profile for a paper web with regard to at least formation, basis weight, and fiber orientation in a paper machine, the paper machine including a headbox with an adjustable die exit opening and within which the consistency is sectionally adjustable, the process comprising:measuring and setting a desired basis weight cross-direction profile by adjusting the sectional consistency in the headbox;adjusting the formation cross-direction profile by adjusting a sectional, specific pulp slurry flow rate at the die exit opening; andone of:enlarging the die exit opening at positions along a width of the paper machine in which a pulp slurry flow rate is higher than in other positions along the width of the paper machine; andincreasing the pulp slurry flow rate for positions along the width at which the die exit opening is larger than at other positions along the width, thereby attaining a desired fiber orientation cross-direction profile.