Retention system using the anionic micro particle polymer

Abstract

The Improved Dual Polymer System (HYMO Twins system) of retention aid for the high speed paper machines consists of addition of the water soluble cationic polymer and anionic polymer those obtained by the micro precipitation polymerization in the salt containing aqueous media. The anionic aqueous polymer dispersion (FA-230) for the system shows excellent performance for the ash retention and the homogeneous web formation because of it's micro particle behavior of the polymer. We discovered the improvement of the micro particle characteristic of the anionic polymer result in small and strong floe suitable for web formation at high shear conditions. The floe formation behavior, the ash retention and the drainage performance of the extended FA-series polymer were analyzed by the Flocky-tester, the Britt Dynamic Jar Tester (DDJ) and the Dynamic Drainage Analyzer (DDA).