After calendering, the paper fibers are no longer loosely arranged, but have a certain degree of tightness, but the smoothness of the surface still cannot meet the requirements of high-end fine printing. The surface uniformity of uncoated paper is poor, the ink color after printing is uneven, the gloss is low, and the fine dots cannot be restored, resulting in the loss of layers, the uniformity of the solid part of the image, and the effect of printing and copying. Therefore, the fine printing paper must be paper Surface coating processing can further improve the surface properties of paper.
The purpose of the paper coating process is to cover the surface of the plain paper with large pores and unevenness formed by fibers with a layer of paint composed of fine particles that has good ink absorption, so as to obtain a good uniformity Smoothness and smoothness of the paper. Coating can also increase the gloss of the paper, improve the stability and opacity of the paper, and these characteristics will increase with the increase of the coating amount.
