Cationic Rosin Size for Weakly Acidic and Neutral Papermaking

Abstract

High levels of calcium carbonate in waste furnishes and increased contaminants in the closed backwater systems have set new demands on rosin sizing in neutral pH. Eka Chemicals have developed new sizing systems to meet these challenges :
·Rosin ester (Bewoid Extra)
·Use PAC (Ekafloc) instead of alum
·Rosin aluminium pre-mix (Bewomix System)
·Cationic rosin size (Composize)
Cationic rosin size, consisting of rosin particles stabilised by cationic polyelectrolytes via protective colloid action, represent the best approach to rosin sizing at neutral conditions. Due to its self-retention property, cationic rosin size can give superior sizing efficiency, reduction in alum usage, and improved machine runnability.