Environmentally friendly wet-end paper reinforcement agents, 2011 PaperCon Conference

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Hot-water extraction of hardwoods within the biorefinery permits a higher rate of delignification during kraft pulping. Pulps from hot-water extracted woodchips can have the same kappa number produced at lower H-factors with the use of lesser amount of chemicals compared to conventional pulps from unextracted woodchips. Biorefinery kraft pulp offers a relatively higher sheet bulk compared to conventional kraft pulp which contributes to better opacity and absorption properties in paper. However, due to lower hemicelluloses content of the pulp, inter-fiber bonding is reduced and hence the strength-to-weight ratio of paper produced from biorefinery pulp needs to be improved to be competitive with conventional pulps. In the present study, we report the results of reinforcement of paper made from biorefinery kraft pulp with the two most widely used biopolymers; polylactic acid and cationic starch.