In copy paper printing, we should learn to control the amount of fountain solution. In color newspaper printing, the first color group water volume is the main factor that determines the impact of newsprint water swelling on the overprint accuracy, and is the water volume under the premise of ensuring the quality of the color newspaper. In printing, a color tower newspaper web offset press should be used, because the paper path between four-color printing is relatively short, and the water-absorbing swelling deformation of newsprint has little effect on the accuracy of the overprint, which is conducive to improving the accuracy of the overprint.
In addition, copy paper should not be too dry, otherwise its water absorption rate is relatively high, and the expansion rate is high, which has a great impact on the accuracy of overprinting; in addition, newsprint becomes fragile, easy to break during printing, and easy to carry static electricity.
Copy paper is a kind of cultural paper. Good flexibility, high whiteness, strong transparency, fine, smooth and smooth. This is a high-grade printing paper. Most domestic paper mills use imported wood pulp to make copy paper. Bleached sulfonate softwood pulp is an excellent wood pulp. Except imported wood pulp, bamboo pulp, awn stalk pulp, and wheat straw pulp. Bamboo pulp papermaking has good strength, but low whiteness;