Some printing knowledge about coated paper
The surface of the coated paper is white, smooth and flat, with high smoothness and whiteness. It is a high-quality printing paper supported by the base paper coated with white paint. Coated paper is one of the main papers used in printing plants. It is commonly used in display life. For example, beautiful management, posters in bookstores, book covers, illustrations, etc., almost all use coated paper.
The coated papers mainly used for printing the covers and illustrations of high-end books and periodicals are divided into single-sided coated paper, double-sided coated paper, matte coated paper, and cloth coated coated paper. According to the quality, it is divided into three grades: A, B, and C. Commonly used coated paper is divided into a variety of thickness specifications from 105 grams per square meter to 350 grams per square meter. In the sale of coated paper, the size of a single sheet of paper is generally divided into two sizes: large (889mm×1194mm) and medium (787mm×1092mm). In the past, the quality of lithographic printing at that time was still low. The reproduction of high-end painting art such as classical oil paintings was mainly used for printing on photo-screen color copperplate (relief). Quantities are 100, 120, 150, 180, 200, 250 grams square meters, and the sheet packaging specifications are 787×1092 (mm), 880×1230 (mm).
The main raw materials of coated paper are coated base paper and paint. The requirements for the copperplate base paper are uniform thickness, low flexibility, high strength, and good water resistance. The paper surface is not allowed to have spots, wrinkles, holes and other paper defects. The coating used for coating is composed of high-quality white pigments (such as kaolin, barium sulfate, etc.), adhesives (such as polyvinyl alcohol, casein, etc.) and auxiliary additives. of. This kind of paint with high fluidity and high solid content is applied to the base paper thinly and evenly by the coater, and then dried, rolled into a roll on the reel, and then sent to the super calender for pressing finishing, final cutting, paper selection, and packing.
The cloth-patterned coated paper is pressed with an old blanket. In addition to the flat surface and high whiteness, it also makes the printed graphics and pictures have a three-dimensional effect. Therefore, this type of coated paper can be widely used for printing pictorials, advertisements, etc. Landscape paintings, exquisite almanacs, portrait photography, etc.
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