Calcined kaolin is also commonly used as a filler. It can also improve the writing and printing of the paper, and increase the evenness, smoothness and gloss of the paper.
Kaolin as paper filler is usually treated by separation after drying and comminution, while kaolin as pigment is often purified by water in order to make better color and finer grain kaolin.
When calcined kaolinite is applied in the field of papermaking, mineral pigments are added into the pulp. After being copied, the mineral pigments are retained in the finished paper fibers to improve the opacity and whiteness of paper, improve the actual smoothness of paper, and ensure that the actual flexibility of paper meets the actual application standard of paper. In the field of papermaking, the proportion of fillers is higher than that of fiber, and the cost of papermaking is reduced to some extent.
