Except for cold cast iron rolls, about half of them are paper pulp rolls, which are made of paper pulp rolls made of wool, rags or asbestos, which are strong and flexible. Usually the bottom roller is the driving roller, and the other rollers rotate by the friction between the rollers. After the paper is rolled, the gloss and smoothness of the paper surface can be significantly enhanced, and the appearance is improved. On the basis of the paper machine calendering, the smoothness and gloss of the paper are further improved, while the process of increasing the tightness and improving the thickness uniformity is super calendering.