How to avoid the impact of screen problems on the color quality of silicone screen printing?

How to avoid the impact of screen problems on the color quality of silicone screen printing?
To avoid the impact of screen problems on the color quality of silicone screen printing, we can start from the production, use, maintenance and other aspects of the screen and take the following measures:
Screen production:
Choose a suitable screen: According to the fineness of the printed pattern, color requirements and the characteristics of the silicone ink, choose a screen with a suitable mesh. Generally speaking, for fine patterns and high-resolution printing, a 300-400 mesh screen can be selected; for large areas and relatively less fine color requirements, a 200-300 mesh screen is more suitable. At the same time, it is necessary to ensure that the material quality of the screen is good, with uniform mesh distribution and stable tension performance.
Ensure the accuracy of screen production: When making the screen, use advanced platemaking technology and equipment to ensure that the pattern on the screen is high in precision and has clear edges. For example, the use of laser platemaking technology can improve the resolution and accuracy of the pattern. Strictly control each link in the screen production process, such as the uniform coating thickness of the photosensitive glue, and the accurate exposure time and development time to ensure the quality of the pattern on the screen.
Control screen tension: The tension of the screen is crucial to the transfer of ink and printing quality. During the screen stretching process, professional tension measuring instruments should be used to ensure that the tension of the screen is uniform and meets the requirements. Generally speaking, the tension of the silicone screen printing screen should be controlled between 20-30N/cm. Too much or too little tension will affect the permeability of the ink and the printing effect, resulting in color deviation.
Screen use:
Correct installation of the screen: When installing the screen on the printing equipment, ensure that the screen is installed firmly, flatly, and parallel to the printing table. If the screen is installed tilted or not firmly, it will cause uneven ink transfer during the printing process, affecting the color quality. At the same time, check the installation of the screen regularly, and adjust and tighten it in time.
Reasonably control the number of prints: According to the characteristics of the silicone ink and the requirements of the printed pattern, reasonably determine the number of prints. Excessive printing may cause screen wear, affect the ink transfer effect, and thus cause color deviation. Generally speaking, the status of the screen should be checked after each printing. If the screen is found to be worn or blocked, it should be handled or replaced in time.
Pay attention to the coordination between the scraper and the screen: choose a scraper with appropriate hardness, and adjust the angle and pressure between the scraper and the screen. The hardness of the scraper is generally between 60-80 degrees, and the angle is usually 45-60 degrees. The pressure of the scraper should be uniform and moderate. Excessive pressure will damage the screen, and too little pressure will lead to insufficient ink transfer. During the printing process, the moving speed of the scraper should be kept stable to ensure that the ink is evenly transferred to the silicone product.
Screen maintenance:
Timely cleaning of the screen: After each printing, the screen should be cleaned in time to remove the residual ink and impurities on the screen. Use a special screen cleaning agent and a soft brush, and clean it according to the correct cleaning method to avoid scratching the screen with hard objects. The cleaned screen should be dried or dried to prevent the screen from rusting or breeding bacteria.
Regularly check the screen: Regularly conduct a comprehensive inspection of the screen, including the tension of the screen, the damage of the screen, the clarity of the pattern, etc. If there is a problem with the screen, it should be repaired or replaced in time. For screens with less wear, you can repair them; for screens with severe wear or damage, you should replace them in time to ensure printing quality.
Store screens properly: When not in use, store them properly. The screens should be placed in a dry, ventilated, light-proof place to avoid squeezing, collision and moisture. You can use a screen rack or screen protective cover to protect the screen and extend its service life.