Patent ID: 6780284
Filing Date: 2004-08-24
Classification: D21F,D21G,Y10S

Abstract:
A method for controlling a moisture profile of a moving paper web during manufacture, the method comprising:disposing a measuring device adjacent the paper web, the measuring device comprising optical fibers through each of which radiation in the infrared range is transmitted to the paper web and optical fibers through each of which the radiation is transmitted from the paper web at a measuring point, and a plurality of parallel measuring heads in which ends of the optical fibers are respectively arranged, the measuring heads being spaced apart in a cross-direction of the paper web; measuring the moisture profile of the paper web with the measuring device prior to drying the paper web, wherein the measuring heads are moved back and forth, over part of the web width, perpendicularly to the travel direction of the paper web, such that the measuring heads substantially simultaneously measure web moisture at a plurality of measuring points distributed across substantially a full width of the paper web so as to measure a cross-direction profile of the web moisture across substantially the full width of the web; and controlling the moisture profile of the paper web, based on the measured cross-direction profile, before drying the paper web.