Variability is defined as the absence of uniformity in pulp stock that varies over time, 23TAPPICon

Many papermakers ask questions such as: is process variability important in papermaking? Where does it come from? How do we get rid of it?  Process variability comes from many sources and is included in the papermaking furnish. The measure of our success in eliminating variability is shown in the finished product. Rolls with too many quality irregularities, due to variability, are lower quality, sell for less and customers are not satisfied.  

Papermaking is an extremely complex mechanical and chemical process.  Papers are manufactured from many materials but primarily from wood fibers. Trees are the major source of these fibers, and they are combined with chemicals, water and minerals to create a papermaking furnish. The individual components of the products recipe are never uniform themselves. The furnish retains the combination of all the variabilities that have not been reduced, or eliminated, before the paper furnish reaches the headbox.  Trying to manage each component, or the entire mixture, begins our introduction to process variability. Mass flow variability is at the heart of all mill process variability. Mills that focus on reducing furnish variations will make better paper and more profits.  

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