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.

Request from the webmaster: Our goals include brevity and accuracy. Hopefully we have succeeded with the first goal without sacrificing the second. Please let us know right away if you find an error or omition. Also, please indicate points that need a clearer description.


RETURN TO INDEX PAGE OF ENCYCLOPEDIA

Home page Research opportunities Business opportunities Background information Links to wet-end chemistry E-Mail
This page is maintained by Martin hubbe, Associate Professor of Wood and Paper Science, NC State University, m_hubbe@ncsu.edu .