The Influence of Coating Adhesives on the Stiffness of Paper

The main purpose of this project was to study the effect coating adhesive has on the stiffness of paper. This work enables one to compare data on what influence adhesive with and without supercalendering has on the stiffness and caliper of the paper. The project was performed with six formulations with a different adhesive or adhesive combination in each. The adhesives were six types, casein, protein, starch, casein + latex, protein + latex and starch + latex. It has been found in general that stiffness of all the paper samples increased when coating adhesive was applied on the surface. The starch gave the higher stiffness followed by protein and casein in that order. By adding the latex to the casein, starch and protein formulations the stiffness decreased in all cases. It was also noted that the stiffness was higher in the machine direction than in the cross direction of the paper. Stiffness and caliper decreased in all cases with supercalendering