It also has good coloring and light-shielding properties, and can also make the paper conductive, so the paper is coated with carbon black, which is often used to load packaging materials (such as photosensitive film packaging paper), various window papers, high-voltage cable paper, etc. Paper, one is the overall coloring method, that is, adding molding agents, reinforcing agents, fillers and carbon black to the pulp, and then mixing and dispersing it in a beater, and then printing it to a solid content of 86%-70%.