Stencil printing and scraping techniques

2. The negative was placed on a glass plate and exposed, and the stretched screen was placed on the positive plate and parallel to the image axis. If you have a moiré pattern, rotate the screen to the left or right until the moire disappears. Generally, turn it to 7°. The area where the moire is easily formed is located at the intersection of the screen mesh and the screen. The main colors and darker colors cause more problems with moire.

3. For four-color printing, a uniform size and uninterrupted aluminum mesh frame should be used, and the mesh frames used are all of a uniform type and type of mesh. The use of dyed mesh helps to eliminate moiré, the tension across the screen is uniform and the tension of the four screens in four-color printing is the same.

4. The grinded squeegee is critical for high-quality printing. The blade has a Shore hardness of approximately 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 steeply, the risk of deformation of the screen printing image is large.

5. The ink-removing knife should not be set too low. If so, the film plate will be covered with excess ink and the printed matter will be easily picked up and dirty.

6. Mesh transfer images are printed with high-viscosity inks, and finer screens require thicker inks.

7. With UV inks, the hue range of the mesh-tuned image should be chosen between 5% and 80%, and the Shore hardness of the squeegee should be 75. In order to control the UV inks in the color overprinting, it is recommended to print in the color order of cyan, magenta, yellow, and black. When using UV ink, the screen thickness does not exceed 5um.