The polishing process has a long history. With the development and progress of continuous application, the content of science and technology is higher and higher, and the scope of application is wider and wider. In particular, the rapid development of water-based coating polishing and UV coating polishing that meet the requirements of safety and environmental protection, as well as the wide application of various online polishing methods, have greatly promoted the popularization, application and technical progress of polishing technology.

Coated paper is also called printing coated paper. Apply a layer of white paint on the surface of the base paper, which is pressed by super calendering. There are two kinds of paper: one side and two sides. The paper has smooth surface, high whiteness and good ink absorption performance. It is mainly used for fine line printing such as offset printing and gravure printing, such as advanced picture books, calendars, illustrations of books and periodicals, etc. The disadvantage is that the powder is easy to bond and fall off after being wet, and it is not easy to preserve for a long time.

We use a lot of paper in our daily life. Do we know how paper is made? What is the raw material of paper?