Application of polyallylamine as a dry strength agent for paper

Our Dry strength agent is a new hydrogel dry strength agent which increases paperboard strength properties by 10-20%. In grades such as testliner, fluting, coreboard, grey board and gypsum board, FennoBond has been proven to increase CMT, SCT and mullen burst strength at equal grammage.

Thus, for the first time, Our Dry strength agent gives board makers the cost advantages of either going to a lower grammage, while retaining strength specs, or using a higher percentage of lower-quality recycled paper for cost savings on fiber.

Dry strength is an inherent structural property of a paper sheet. It is due primarily to the development of fiber-to-fiber bonds. Polyamines, especially polyallylamine, were found to be suitable mordants for rosin sizing. However, their effectiveness as dry strength agents has not been studied. In this study polyallylamine-HCl (PAA) was found to be an effective dry strength agent. With unbleached kraft pulp, 0.5% PAA on mass of oven dry pulp was sufficient to increase the dry strength of handsheets, while bleached kraft pulp required more PAA based on the mass of oven dry pulp. Different strength properties were measured and it was found that the largest increase was in the folding endurance of the handsheets. The strength properties were highly dependent on the drying conditions of the handsheets. In this paper dry strength development is discussed based on the interaction between protonated (cationic) PAA and the cellulosic fibers and between the interaction of the cationic amine and the aromatic pi-bonding of lignin. PAA was effective as a dry strength agent and the bursting strength, folding endurance and the tensile strength increased for handsheets made from different types of pulps using polyallylamine-HCl. PAA is a promising material that may offer superior performance in some specialized applications.

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