Historical and Theoretical Survey of the Effect of a Cationic Starch on the Hygroexpansivity of Paper

The effect of a cationic starch as an additive on the hygroexpansivity of paper was made. It was found that the hygroexpansivity of the paper increases as the freeness of the stock is lowered. Small additions of cationic starch gave a substantial strength increase with approximately the same expansivity as the lower strength paper made with pulp alone