CONTINUOUSLY CONTROLLING THE BASIS WEIGHT OF PAPER BY A TIMED BASIS WEIGHT VALVE POSITION SIGNAL

摘要

Method and apparatus for controlling the basis weight of paper and the like whereby the basis weight of the paper from a papermaking machine is measured by scanning the paper with a gamma gauge. The gamma gauge develops corresponding analog outputs which are converted to digital equivalents. A digital computer from these digital equivalents determines the difference between the measured average basis weight and the desired basis weight, introduces various compensating factors, and then develops a timed valve position signal. This valve position signal through a valve operator adjusts the machines pulp slurry or papermaking stock control valve so that the actual basis weight will proximate the desired basis weight.