Analysis and solutions of Common problem in Screen Printing
In screen printing, due to the selection of ink, the characteristics of the printing substrate, the uncertainty of printing environmental factors, etc., it is easy to cause various printing failures, affecting the production cycle and product quality, and causing losses to users and suppliers. . How to avoid these losses?
The printing pattern is not clear
reason:
1. Improper selection of ink or quality problems in the ink itself.
2. The ink dries too fast, so that the printed pattern or lines are not clear, resulting in incomplete patterns or broken lines.
3. The viscosity of the ink is too high, resulting in incomplete patterns or broken lines during printing.
4. There is a phenomenon of jamming in printing, which affects the normal over-inking of the ink.
5. The squeegee pressure is insufficient or uneven during printing, resulting in uneven ink flow.
6. The performance of the substrate is uneven.
Solutions
1. Replace the appropriate ink.
2. Use slower drying solvents to formulate inks
3. Dilute ink or add angle change agent to reduce viscosity.
4. Correctly select the slow-drying solvent to dilute the ink, and pay attention to the inking performance of the printing screen.
5. Increase the strength of the scraper during printing, and pay attention to the uniformity of the scraping force.
6. Treat the surface of the substrate (such as printing a rough-grained substrate, you can use varnish or other duqiu semi-priming before printing)