Root cause analysis of cationic polymer additive efficiency decline in virgin and recycle containerboard mills, TAPPI Journal January 2020

Application: The main objective of our studies was to discover the primary reason for polymeric efficiency decline in paper mill process waters and look for ways to overcome the problem. It was found that increased levels of soluble lignin is the main reason for polymeric efficiency loss. If lignin levels are high, there are ways to remove some of the soluble lignin and to improve on efficiency of polymeric additives and paper machine runnability.

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Author: Davit E. Sharoyan and Cory W. Ross
Root cause analysis of cationic polymer additive efficiency
ABSTRACT: It is well known that retention, drainage and strength polymers struggle to perform (if at all) in virgin containerboard mills. In-depth studies have been undertaken in this area for more than seven years, investigating the issue from all directions. A key finding of this work is that soluble lignin is detrimental to chemical efficiency. A strong correlation exists between decreased chemical efficiency and high soluble lignin. Both recycled systems and virgin systems have been studied, and this correlation holds true regardless of furnish. The primary area of concern is virgin container-board, because these mills tend to have the highest lignin levels. Some highly closed recycled mills can also build elevated lignin levels that can negatively affect chemical efficiency.

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