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Sodium alginate paper coating
Up to 1 percent sodium alginate will prevent change in viscosity of the coating suspension under the high shear conditions where it contacts the roller. The sodium alginate also helps to control water loss from the coating suspension into the paper, between the point where the coating is applied and the point where the excess is removed by the trailing blade. The viscosity of the coating suspension must not be allowed to increase by loss of water into the paper because this leads to uneven removal by the trailing blade and streaking of the coating. Medium to high viscosity sodium alginates are used, at a rate of 0.4-0.8 percent of the clay solids. Because of the solvent resistance of alginate films, the print quality of the finished paper is improved.
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