Due to the wide range of screen printing objects and the variety of screen printing inks, there are quite a lot of factors affecting the quality of screen printing, but no matter what form of screen printing is adopted, the main factor affecting the quality of printing is The reasons are as follows:
① The quality of the ink itself is good or bad;
② The performance of the screen is good or bad;
③ The stability of the screen size;
④ plate making method of screen printing plate;
⑤ Process conditions of the printing process.
Common faults and general countermeasures when using screen printing ink are shown in Table 9-7.
| Symptoms | reason | Solution |
| bubble | too high viscosity | Reduce viscosity, add defoamer |
| Ink overflows from the inked part | Viscosity is too low | Add desiccant, replace ink |
| ink clogging plate | The ink dries quickly and the ink particles are coarse | Add drying inhibitor, reduce ink viscosity, improve ink thread head |
| When the printing plate is separated, the ink is drawn and the printing surface is stained | The ink dries too fast, the ink viscosity is too high, and the ink filament is too long | Add drying inhibitor, reduce ink viscosity, improve ink thread head |
| poor drying | Insufficient heating time and temperature Insufficient desiccant | Extend the baking time or increase the temperature to increase the drying agent |
