A Study of the Comparative Effects of Titanium Dioxide on Paper Brightness and Opacity When Used as Filler versus Its Use as a Coating Mineral

Introduction Because of the fact, that advertisements printed on bright papers have the most appeal, and papers printed on both sides must have absence of show-through, brightness and opacity have become important variables in paper making. Titanium dioxide used a a filler or as a coating mineral will cause an increase in paper opacity and brightness. Because titanium dioxide is expensive, it is important to know how it can be used (as filler or coating) to the best advantage. Objective The purpose of this project is to compare the optical gains (opacity and brightness) imparted to paper by using titanium dioxide as a filler versus its use as a coating mineral