Coated paper concept
Coated paper, also known as coated printing paper, is called powder paper in areas such as Hong Kong. It is a high-grade printing paper made of white paper coated with a base paper. It is mainly used to print the covers and illustrations of high-end books, color pictures, various exquisite product advertisements, samples, product packaging, trademarks, etc.
The main raw materials for coated paper are copperplate base paper and paint. The requirements for the copper plate base paper are uniform thickness, small stretch, high strength and good water resistance. There are no paper spots such as spots, wrinkles, and perforations on the paper surface. The coatings used for coating are composed of high-quality white pigments, adhesives (such as polyvinyl alcohol, casein, etc.) and auxiliary additives. The paint having a large fluidity and a high solid content is uniformly applied to the base paper by a coater, then dried, rolled into a roll on a winder, and sent to a supercalender for pressure. Finishing, final cutting, paper selection, packaging.
Coated paper is characterized by a very smooth and smooth paper surface with high smoothness and good gloss. Because the whiteness of the coating used is more than 90%, and the particles are extremely fine, and calendered by the super calender, the smoothness of the coated paper is generally 600 to 1000 s. At the same time, the paint is evenly distributed on the paper surface to show a pleasing white color. The requirements for coated paper have higher coating strength, the coating is thin and uniform, no bubbles, and the amount of adhesive in the coating is appropriate to prevent the paper from being detached during printing, and the absorption of paraxylene in the coated paper. To be appropriate, it can be used for fine mesh printing of 60 lines/cm or more.
The main purpose
The coated copperplate paper is pressed by the old felt. In addition to the flatness of the paper and the high whiteness, it also gives the printed graphics and pictures a three-dimensional effect. Therefore, the coated paper can be widely used for printing pictorials, advertisements, and Landscape paintings, exquisite calendars, character photography, etc.