Novel PAM Based Dry Strength Resins for Highly Calcium Carbonate Filled Paper

Abstract

Recently, domestic paper demand has declined due to global economic recession. So, Japanese paper producers made scrap-and-build plans to concentrate production on larger and more efficient machines, thus reducing costs and have proceeded with these plans to improve revenue and enhance their competitiveness. Under these difficult circumstances, polyacrylamide(PAM)based dry strength resins(DSRs)is one of the best solutions for maintaining productivity and quality of paper.In order to overcome these problems, we have conducted the study based on the results for several model experiments that fixations of DSRs are different for pulps and PCC, and flocculation of PCC is also different, depending on ionicity(density)and molecular weight of DSR. As a result, we have developed novel PAM based DSRs for papers filled highly with PCC, which show excellent dry paper strength and high retention without excess flocculation of PCC fillers.