Mini-Encyclopedia of Papermaking Wet-End
Part Three: Equipment & Unit Operations
Rushing the Sheet
Papermakers use the word "rushing" to describe the situation in which the forming fabric is moving slower than the jet of stock. On many paper machines a minor amount of rush, say 1-3% relative to the fabric velocity, can improve formation uniformity. Rushing also tends to give fibers a greater alignment in the z-direction than they would have otherwise. Excessive rushing of a sheet is expected to hurt product strength and reduce the uniformity of formation. The opposite of rushing is dragging.
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