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This paper evaluates the effect of addition of precipitated lignin, from   spent pulping black liquor, to a wet single-ply linerboard handsheet followed   by hot-pressing at different temperatures, on the improvement of its   compressive strength. Linerboard handsheets for testing the effect of lignin   addition were prepared so that the lignin-modified sheets would have the same   basis weights as the control handsheets. Both the commercial and the black   liquor lignin were added as a powder to wet handsheets after couching from   the handsheet mold. The experiments and testing of the physical and strength   properties of dried handsheets were conducted according to TAPPI test   methods. The results revealed that the addition of the recovered lignin (at   pH of 2) to the wet handsheet followed by hot-pressing at 150°C increased the   compressive strength of linerboard handsheets by 10% to 20% above that for   handsheets made without the addition of lignin. The same results were   achieved using purchased lignin. However, with a 16% addition to linerboard,   purchased lignin would be too expensive. These results indicate that   inclusion of kraft lignin in linerboard sheets could be proved as an   attractive option to reduce linerboard basis weight

Improvement of linerboard compressive strength by hot-pressing and addition of recovered lignin from spent pulping liquor