Some printing knowledge about coated paper

Copperplate paper has a white surface, smooth and flat, with high smoothness and whiteness, it is a high-class printing paper made of raw paper coated with white paint. Copperplate paper is one of the main paper used in the printing house, copperplate paper is commonly known, the official name should be printing coating paper. And in the current real-life use is very common, we see the beautiful calendar, bookstore sales of posters, book covers, illustrations, etc., almost all of them are used coated paper.

Mainly used for printing high-level books and magazines cover and illustration coated paper has a single-sided coated paper, double-sided coated paper, non-glossy coated paper, cloth coated paper points. According to the quality is divided into A, B, C three. Commonly used coated paper is divided into a variety of thickness specifications from 105 grams per square meter to 350 grams per square meter. Copperplate paper sales sheet size is generally divided into large (889mm × 1194mm), medium (787mm × 1092mm) two size specifications. In the past, when the quality of lithographic printing is still low, reproduction of classical oil paintings and other high-level painting art, the main application of this paper in the photographic over the screen color copper plate (letterpress) printing. Quantity has 100, 120, 150, 180, 200, 250 grams square meters, flat sheet packing specifications for 787 × 1092 (mm), 880 × 1230 (mm).

    The main raw materials of coated paper are coated base paper and coating. Requirements for coated paper is uniform thickness, small expansion and contraction, high strength, good water resistance. The paper surface is not allowed to have spots, wrinkles,

Paper diseases such as porosity, the coating used for coating is composed of high-quality white pigments (e.g. kaolin, barium sulfate, etc.), adhesives (e.g. polyvinyl alcohol, casein, etc.) and auxiliary additives. This kind of coating with high fluidity and high solid content is thinly and evenly coated on the raw paper through the coating machine, and then dried and processed, rolled into rolls on the paper rolling machine, and then sent to the super calender for calendering and finishing, and finally slit, paper selection and packing.

    Cloth coated paper is pressed with old blankets, it is in addition to the paper surface is flat, high whiteness, but also make the printed graphics, picture has a three-dimensional sense, so this coated paper can be widely used to print pictorials, advertisements, landscape paintings, fine calendars, people photographic drawings and so on.