A considerable amount of information has been reported on how various polymeric additives affect drainage rate and fines retention. When used as a drainage aid, polyacrylamide can overcome slow drainage of fiber furnishes containing high-yield pulps such as stone groundwood, hardwood pulps and recycled fiber furnishes. In addition, these additives improve the drainage of high-base-weight paperboard furnishes and drainage of paper machines that are drainage limited. Mineral fillers have long been used in papermaking, especially in printing and writing papers, as they add positively to sheet formation, brightness, opacity and printability, besides lowering furnish cost. The common of flocculation of these fillers is crucial in order to maximize their retention in the fiber web, due both to economic and environmental concerns. However, since retention has to be balanced with an adequate drainage of the wet web and a good formation of the paper sheet, fiber flocculation should b...

In papermaking process, fibers, fillers and some additives are not water-insoluble, so they are easy to accumulate in aqueous solution. Moreover between the different materials as far as possible from the incompatibility away, so it is difficult to get uniform performance and ideal strengthen paper. In order to solve the long fiber in the process of this problem, the using of polyacrylamide has following advantages: to improve the retention rate of fillers, pigments and so on. To reduce the loss of raw materials and environmental pollution. to improve the strength of the paper (including dry and wet strength). to improve the tear resistance and porosity to improve visual and printing performance. The advantages of using polyacrylamide as a paper dispersant are also manifested in the fact that the product is soluble in water and forms a high viscosity liquid which promotes good dispersion of papermaking fibers and excellent paper forming effect at low added levels to impro...