In papermaking, a weak slurry of pulp and various additives is produced and spread out to form a continuous sheet. While the basic properties of the fiber were set in the pulping process, the paper machine’s job is to form the sheet, remove water, and finish the product according to the end user’s specifications. The Quality Control System (QCS) provides measurements of key properties and a means to automatically control them.
Paper machines are generally much wider than the finished, converted product, so it is necessary to measure variability all the way across the machine (“cross direction” or “CD”) as well as measure the variability in time (“machine direction” or “MD”). To do this economically, a single set of sensors can be installed on a frame and made to scan back and forth across the sheet, while the sheet moves below. The net result is a measurement in a zigzag pattern that can yield information about the sheet’s MD and CD characteristics.
Advanced scanning measurements are available to address the following needs:
What is in the product?
What does it look like?
How does it perform?
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