What should we pay attention to when doing screen printing mesh work?
Screen printing mesh is achieved by screen printing, while screen printing is inseparable from the screen. In addition to selecting different textures according to different printing requirements, there are some basic requirements for the screen itself. Some identification of the screen used before the plate making can avoid some phenomena that affect the quality of the print. The main requirements for the screen are: 1. The screen should have a certain strength to meet the tension requirements of the stretcher and printing. 2. High wear resistance. The screen should have a certain degree of wear resistance to ensure that the screen printing plate has a high printing durability (the screen with high abrasion resistance can be recycled and reused). 3. Since the silk is exposed to water during the printing and plate making process, the shrinkage rate and elongation are required to be small after the screen is exposed to water. 4. The surface of the wire mesh wire should be smoother to reduce the phenomenon of blocking the mesh during the printing process. 5. The size of the mesh mesh should be uniform to ensure uniform ink leakage. 6. Solvent resistance is strong, and the physical properties of the screen should remain unchanged after contact with the solvent. How to calculate the finest width of the fine lines of the screen reproduction? A: In screen printing, the printing precision of the replica is closely related to the screen. The mesh size has an important influence on the reproduction of the thick lines of the thick draft. Therefore, when selecting the screen, it is necessary to carefully select the silk. The number of meshes corresponds to the printed fine lines, so that the selected wire mesh has the property of sufficiently reproducing the fine lines of the original to ensure the printing effect. In screen printing, fine lines generally refer to lines that are 0.1-0.2 mm wide. Screen printing reproduces the thinnest width of the line. In the screen printing, the selected screen can reproduce the width value of the thinnest line. This line width is directly related to the mesh and mesh width. The following calculation formula can be used as the basis for selecting the screen when selecting the net. The formula of the thinnest line width value: k=2s+k where: k-the width of the thinnest line s--the wire diameter k--the calculation of the width of the mesh: If 200 mesh/inch nylon mesh is used, try What is the minimum width of the line to be reproduced? Check NM200 inch screen, wire diameter (s) is 0.05mm, mesh width (k) is 0.077mm, substituting the above formula, get k=2×50+77=0.177m, NM200 mesh/inch screen reproduction line The minimum width is 0.177mm. What are the basic requirements for screen printing by screen printing? A: The screen brushing plate has the following basic requirements for the original: ○1 Monochrome (text, line) originals should have sufficient contrast. ○2 The contrast of the continuous adjustment original should meet the basic requirements of photoengraving. ○3 The original has a high definition. ○ 4 color continuous tone of the original color should meet the basic requirements of the printed copy of the color. Q: What is the process flow of the silk screen color desktop prepress processing system? Answer: The silk screen color desktop prepress processing system uses computer technology to process graphic and text information. Instead of the traditional film production method: 1. Input part. The input device is mainly scanner, keyboard and digital camera. The scanner is mainly used for color image manuscript and text input; the keyboard is mainly used for text input. Digital cameras are primarily used for color camera input. 2. Graphic information processing part. The graphic information processing device is mainly a computer device. At present, computers for graphic information processing mainly include PC series and MAC series computers, which have strong image processing functions, and are more suitable for image, graphic and creative design. Graphic Information Processing In addition to hardware, the most important thing is to configure the corresponding software. There are five main commonly used software: A. Image processing software (photshop); B. Graphics processing software (Freehand); C. Typesetting, grouping software (illustor); D. Typesetting, grouping software (PageMake); E. Chinese and English fonts. ○ 3 output part. The output section mainly refers to different output devices. There are many types of output devices, and when they are selected, they need to be configured according to different process requirements. The main output devices are color inkjet printers, hot wax printers, sublimation printers, laser color printers, and laser imagesetters.