In order to eliminate pitch-trouble in paper-making process, use of coagulants is effective to reduce free pitch particles in the process water by fixing “micro-pitch” onto pulp fibers before growing into a large-size pitch.
In our previous report, we introduced new analysis methods, “micro-pitch image analyzer system” and “film adhesion method”, as the tools for analysis of micro-pitches and evaluation of coagulants. The methods showed that a coagulant having specific property reacted with a particular type of pitches selectively, and thus a particular coagulant should be chosen for the different types of furnish, GP, TMP or DIP etc.
In this report, we indicate several Organic Polymer Coagulants synthesized by controlling the charge density, the molecular weight and the balance of hydrophilic and hydrophobic segments show different characteristics in adsorption onto sticky-pitch, coagulation of micro-pitches and ion-neutralization of anion trash as a pitch control agent.
We believe that our Organic Polymer Coagulants contribute to stabilize the paper-making process by selecting appropriate coagulant according to the property of the furnish, a type of pitch-trouble or other purposes.