Four printing methods cannot use the same data plate making

At present, traditional printing processes basically use four major printing methods: lithographic printing, gravure printing, letterpress printing, screen printing (leakage printing, hole printing). There are four major printing methods and there are also four major platemaking processes. As the printing method Different, the printing principle and the ink value also have the very big difference. Therefore makes the colored edition, the same hue, is not the same edition type, cannot use the same data plate making. One. The flat printing is the indirect printing law it is to print The ink on the plate is transferred to the rubber plate, so the ink is thinner and the hue is also reduced. Therefore, when the plate is made, the color value on the plate is larger than the original color value, so as to achieve the effect of restoring the original hue. In terms of terminology, the plate-making tone should be long, the high-profile tone can be netted, and the low-key tone can be solid. The middle tone (five points) prevails. The color value of the plate should be greater than the color value of the original document. Toppan Printing is Direct Printing Regardless of the structure of the printing press, what type of model is it? There are several types of printing used in relief printing: lead printing, copper printing, zinc printing, flexographic printing, and rubber engraving. These printing types are directly connected to the printed material. In printing, the ink layer is thicker than the lithographic ink layer, so When color version is used, the color tone should be short, and the color combinations of copper plate, zinc plate, and flex plate are briefly described as follows: 1. The color version of copper plate is not intuitive, and the color value on the plate is not visible. It is With the method of layered corrosion, to achieve the color value requirements. High-profile can not be net, the net will be printed will appear hard mouth, low-key can not be solid, the end will appear fish scales, to adjust the middle (five points) prevail, version The color value is the same as the color value of the original, and the tone reduction is achieved through printing. This type of ink flow has a smaller variable. More than 50% of dots, when printing, the color value should be expanded by 10%-20%, so the color tone should be Short .2. Zinc version The low version has a sense of intuition, and the plate making process is simpler than the copper plate. It uses a halftone dot to achieve one-half dot shape by etching. Low profile and middle tone are the same as the copper plate. Zinc plate color version The printing method and the ink are the same as the copper plate. 3. The low version of the flexographic plate is intuitive. It is made by etching. The process is relatively simple. The high profile can be netted, the low profile is the same as the copper plate, and the middle tone (five Into the point), because of the greater flexibility of this type of printing. The dot enlargement rate during printing is larger. III. Gravure printing is a direct printing method during the printing process The printing plate and the object to be printed are in direct contact. Its ink-jet point is concave. The ink flow is variable (liquid), but the filling material is small. The color value is larger. The rate is relatively large. Therefore, in the platemaking process, the color tone should be short, high profile can be netted, and the low profile should be compressed by 20%-30% compared with the flat tone. The medium tone (five points) shall prevail, and the color value on the plate should be less than Original color value. To achieve tone reduction through printing. Gravure also has a feature, the version of the text and the actual bottom must also be formed with dots, only this ink can be regularly on the plate cylinder, so as to achieve the ideal printing requirements. 4. Screen printing is a direct printing method. Many of its models, printing a wider variety of products, known as all-around printing. In recent years, screen printing has developed rapidly, but the printed products are still limited to simple text and lines of Products. In addition to Guangzhou can print large murals, have not seen other network cable color products, the main reason is that plate-making technology can not keep up, and foreign screen printing is widely used. Network cable color version, I have also tried, plate-making When you want to grasp the following points: 1. The number of screen lines and the number of lines In general, the ratio of screen lines equals three times the number of original lines, that is, 3:1. If we use 100 lines of screen plate,
The wire mesh (silk silk) has to use 300 lines. 2. Grasp the screen angle and the bottom plate angle. The angle difference between the two angles can not be greater than 30 degrees, especially the magenta, cyan and black.
Otherwise, there will be turtles, which means that you cannot use the traditional platemaking point of view. 3. Stretching tension should be the same, otherwise there will be ghosting in the printing overlay. In addition to the above three points, in the plate color, the hue should be short, high profile can not Absolute network (referring to the colorless place) low-key compared with the lithography, the color value on the plate to be compressed 20% -25%. In the middle tone (50 percent point), the color value on the plate is smaller than the original color value, through Printing can achieve the desired effect of tone reduction. The color of plate making should be based on the principle of printing ink and the thickness of the ink coating layer. The screen printing ink is pressed from the top to the bottom of the object to be printed. On the screen, the thicker the ink line is, the thicker the ink layer is. When printing, 50% use the Internet, the ink value enlargement rate is relatively large, and 10% of the following outlets are not easy to ink. Therefore, high-profile printing cannot be eliminated.