Pulp & Paper - Paper Mill
Paper Machine Basis Weight Application Challenge
In this application, the papermaker must control the amount of “thick stock” (about 3% consistency) that is diluted at the fan pump with white water, to achieve the right amount of fiber going to the reel (e.g. the right weight of the sheet).
A scanner at the dry end, just before the reel, measures the final weight of the sheet. (note: we are only talking about “machine direction” weight; that is the average weight of the sheet at one unit of time-- the scanner also determines the “cross direction” weight profile, which shows the weight across the sheet).