Copy paper printing uses screen printing, which is called the four printing methods together with offset printing, embossing, and gravure printing. After the copy paper is placed under the screen, the ink with paint-like viscosity is applied to the screen.
The products printed on copy paper have Hong Kong version on site, as well as text, lines and patterns. For example, for printing products such as express mail envelopes, wine boxes, cigarette boxes outer packaging (bar boxes) and other printed products of the postal department, the color sequence of the printing is recommended to print text, lines, and patterns first, and then put the full page on the spot and print it on the machine. In this way, it can avoid the phenomenon that the copy paper is thick and the paper collides with each other when the imprint is not dry, and the backside is dirty.
The production of general printing paper is divided into two basic processes: pulp and papermaking. Pulp is the use of mechanical methods, chemical methods or a combination of the two methods to dissociate plant fiber raw materials into natural pulp or bleached pulp. Papermaking is the process of combining pulp fibers suspended in water into paper sheets that meet various requirements through various processes.
Copy paper printing uses offset printing. The offset printing is based on the principle of oil and water repellency. The printing process is: First, the inked image part is formed on the lithographic plate. The image can be drawn directly on the lithographic plate with an oil-based pen, or it can be formed by photographic methods. Secondly, water the printing plate. The water covers the non-graphic part of the printing plate.