Date of Award
Bachelor of Science
Paper Science and Engineering
Two types of dual polymer retention aid systems, a low molecular weight, high charge density, cationic polyamine with a high molecular weight, low charge density, cationic polyacrylamide, and the same polyamine with a high molecular weight, highly charged anionic polyacrylamide, were studied using the Dynamic Drainage Jar, the Minidrinier, and handsheets. Both systems gave higher retention than could be achieved using any of the retention aids alone, however, formation was a problem. Contact time and shear were shown to be important variables. All three testing methods were useful, the Dynamic Drainage Jar having an advantage due to its flexibility.
Null, David E., "A Study of Dual Polymer Retention Aids for the Retention on Titanium Dioxide Using the Dynamic Drainage Jar, Minidrinier, and Handsheets" (1978). Paper Engineering Senior Theses. 396.