Method of monitoring surface charge of suspended materials colloidal system

Abstract From the Canadian patent

A titration technique for measuring the surface in a papermaking colloidal suspensions, particularly on the furnish in a papermaking process. The surface charge measurements are used to determine the optimum conditions for maximizing the drainage rate and first pass retention on a papermaking machine. The amounts of a cationic and anionic polymer that adsorb onto the surface of the headbox furnish components are measured by a colloid titration technique and the surface charge is calculated. A furnish having a met positive surface charge on its suspended particles adsorbs more anionic polymer than cationic polymer. The opposite is true in a negatively charged system. The ratio of the amounts …