Paper Industry


In general, kaolin is the first choice of pigment for paper coating, followed by calcium carbonate, barium sulfate, satin white, titanium dioxide, aluminum hydroxide, talc, zinc chloride, zinc barium white, barium sulfate, etc. Talc is less used as pigment.

Application Details


In general, kaolin is the first choice of pigment for paper coating, followed by calcium carbonate, barium sulfate, satin white, titanium dioxide, aluminum hydroxide, talc, zinc chloride, zinc barium white, barium sulfate, etc. Talc is less used as pigment.

Kaolin with flake structure is coated on the surface of the original paper and then calendered so that it is arranged parallel to the paper surface, which has a high reflectivity to light and thus can achieve a very high smoothness and gloss. Kaolin with non-sheet structure (e.g. tubular and rhombic hexahedral structure) does not have these advantages. This is something that must be considered in the specific selection and production of materials. In China, kaolin clays from Suzhou, Maoming and Zhanjiang are of high quality (including high content of flake structure), so they are generally used a little more as pigments.

It is also common to use kaolin as filler. It also improves the writing and printing properties of paper pages, and increases the evenness, smoothness, and gloss of paper pages.

Kaolin used as a filler in paper making is usually dried and crushed and then graded and purified by sorting, while kaolin used as a pigment often needs to be purified with water in order to make a better color and finer particle size kaolin.

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