Mini-Encyclopedia of Papermaking Wet-End Chemistry
Part Three: Equipment & Unit Operations

Rectifier Roll

The rectifier roll is an empty stainless steel cylinder with large holes in its surface. Papermakers often refer to rectifier rolls as "holey rolls." The rectifier rolls rotate at a controlled rate below the water-line of an air-padded headbox. The function of a rectifier roll is to even out to flow of fibers within the headbox and prevent settling. The speed of rotation can be optimized to minimize defects such as barring (periodic MD-variations in weight) and flocs associated with the holes in the rectifier rolls.

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This page is maintained by Martin hubbe, Associate Professor of Wood and Paper Science, NC State University, .