Common Problems & Solution of Soldermask
There are 27 conventional solder mask and screen printing problems and solutions. I have put them together and put them in the form of the link below. If you need it, you can click to download it.
| Common Problems and Solutions of Soldermask Ink | ||
|---|---|---|
| Problems | Reasons | Solutions |
| Ink Adhesion is Not Strong | Ink model selection is not suitable. | Change to the appropriate ink. |
| The surface of the printed body has not been treated or is incompletely treated. | Add pre-processing procedures for screen printing and improve pre-processing procedures | |
| The drying time and temperature are incorrect, and the amount of exhaust air during drying is too small. | Use the correct temperature and time to increase the amount of exhaust air. | |
| The amount of additives is inappropriate or incorrect. | Adjust the dosage or use other additives. | |
| The humidity is too high. | Improve air dryness. | |
| Block the net | Dry too quickly. | Add a slow drying agent. |
| The printing speed is too slow. | Increase the speed and slow down the desiccant. | |
| Ink viscosity is too high. | Add ink lubricant or extra slow drying agent. | |
| Thinner is not suitable. | Use the specified thinner. | |
| Penetrate, Blur | Ink viscosity is too low. | Increase the concentration without adding thinner. |
| The screen printing pressure is too high. | Reduce pressure. | |
| Bad glue scraping. | Replace or change the angle of the rubber screen printing. | |
| The distance between the screen and the printing surface is too large or too small. | Adjust the spacing. | |
| The tension of the screen printing screen becomes smaller. | Remake a new screen version. | |
| Ink wrinkle | The ink is too thick. | Reduce viscosity. |
| The ink dries too slowly. | Speed up the desiccant. | |
| Insufficient drying. | Increase the drying temperature or extend the time. | |
| The environment preserved after screen printing is inferior. | Reduce temperature and humidity and strengthen ventilation. | |
| Bubbles and pinholes | Ink viscosity is too high. | Reduce viscosity. |
| The speed of the screen off the board during screen printing is too fast. | Reduce off-board speed. | |
| The table is uneven. | Adjust or replace the table. | |
| The ink itself is a problem. | Add defoamer or replace ink. | |
| The ink did not stand for a while after stirring. | After stirring the ink, it needs to be allowed to stand for a while. | |
| After screen printing, directly bake the PCB board. | After screen printing, it needs to stand for a while before drying. | |
| Ink whitish after curing | The thinner does not match. | Use the specified diluent instead. |
| The ink contains moisture. | Replace with new ink. | |
| The air humidity is high. | Reduce air humidity. |