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

Interfering Substances

The term "interfering substances" is used by papermakers to explain poor performance of retention aids, sizing chemicals, and other additives in certain papermaking furnishes. Some of the best-known types of interfering substances consist of anionic dissolved polyelectrolytes and colloidal substances (DCS or anionic trash). These anionic substances can neutralize cationic additives and interfere with their function or their retention. Other substances that can interfere with papermaking operations include surfactants, salts (high conductivity), fines, and residual bleaching chemicals.

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