Now the application range of products processed with plexiglass is getting wider and wider, and the requirements for plexiglass processing are getting higher and higher, especially plexiglass screen printing, which is a challenge and an opportunity for plexiglass processing manufacturers. Mastering high-quality plexiglass screen printing technology is an important technical force for plexiglass processing plants. The main points for improving the plexiglass screen printing process are the following seven points:
1. A basic requirement for perfect image reproduction is that the quality of the transparent positive film is better, that is, the edges of the dots should be neat and opaque. The color separation film and the printing ink used use the same color scale.
2. Put the negative film on the glass plate, and then expose it. Put the stretched screen on the negative film, parallel to the image axis. If moire appears, rotate the screen to the left or right until the moire disappears, usually by 7 °. The area where moire is easy to form is located in the direction of the wire mesh and at the intersection of the wire mesh. The main color and the darker color cause more problems with moire.
3. For four-color printing, aluminum screen frames of the same size and stability should be used, and the screen frames used are all stretched with the same type and type of screen. The use of dyed silk screen helps to eliminate moire. The tension of the screen should be uniform and the tension of the four screen printed four screens should be the same.
4. The well-ground squeegee is essential for high-quality printing. The Shore hardness of the blade is about 70. The squeegee should be set at an angle of 75 °. If the angle of the squeegee is adjusted too flat, the printed image may be blurred. If the angle is adjusted too steep, the risk of screen printing image distortion is greater.
5. The ink return knife should not be installed too low. If so, the membrane plate will be filled with excessive ink, and the printed matter is easy to blur and smudge.
6. Screen tone images are printed with high-viscosity inks. The finer the screen, the darker the ink.
7.Using UV ink, the tonal range of the mesh-adjusting image should be selected from 5% to 80%, and the Shore hardness of the rubber scraper should be 75. In order to control the UV ink from overprinting in color, it is recommended to print in the order of cyan, magenta, yellow, and black. When using UV ink, the screen thickness should not exceed 5μm.
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