Mini-Encyclopedia of Papermaking Wet-End Chemistry
Part Two: Definitions and Concepts

Crowding Factor

The crowding factor of a fibrous slurry is a way to predict the relative degree to which it will become flocculated by the action of hydrodynamic shear forces alone, even in the absence of attractive forces between the solids. The theory behind the factor is related to the amount of "room" a fiber needs to rotate without touching other fibers. The crowding factor is directly proportional to the consistency. It is proportional to the square of the ratio of fiber length to diameter. Two furnish samples having the same crowding factor are likely to yield sheets having the same uniformity of formation, assuming that all other factors are equal.

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