The Latest Technological Trends of PAM Based Dry Strength Resins

Abstract

Polyacrylamide based dry strength resins (PAM) are multifunctional chemicals which are widely used to enhance paper/paperboard strength, and to improve drainage, and retention of fiber, fine, and filler. In recent years, papermaking conditions have changed by greater use of recycled pulp, high amount of coated broke in furnish, higher loading of filler, increases in speed of paper machine and closed water system in paper mill. These trends results in the rising of pH values and electric conductivity of furnish and the increasing of dissolved and colloidal substances in papermaking systems, that disturb the absorption of papermaking additives to fiber and fine. Under these circumstances, the performance of conventional PAM has become unsatisfactory.
Recently we developed two types of new technology for PAM. One is the manufacturing process for highly branched and higher molecular weight PAM, and the other is introduction of novel absorption unit in PAM. In this report, we will explain the characteristics of our new PAMs as the latest technological trends of PAM.