Double Copper Card is a kind of coated processing paper used for copperplate printing. According to different uses, it can be divided into single-sided or double-sided coated paper, and there are flat paper and roll paper. The basis weight is generally 105 to 300g/m ². The paper is uniform and dense, with a high whiteness (above 85%), a smooth surface with high gloss, and a firm and consistent coating, which is convenient for obtaining exquisite and clear patterns and text after printing. It is widely used in real life. For instance, the beautiful calendars we see, the posters sold in bookstores, the covers of books, illustrations, art books, picture albums, etc., are almost all made of coated paper. It is also extensively used in various exquisitely decorated packaging, paper handbags, labels, trademarks, etc.