The difference in ink color on the big screen greatly compromises the aesthetics of the product. Why does this happen? There are many factors that affect the color of ink in PCB production, and there are 3 factors that play a major role.
First, the texture of the sheet
The texture of the board also determines the color of the board itself, and the consistency is determined by the upstream PCB manufacturer, which is basically uncontrollable, and it is difficult to select before PCB production.
Second, ink thickness
The coating uniformity of the ink determines the thickness of the ink. The thickness of the ink itself is in the micron level. A slight difference will cause a difference in color. At present, PCB industry equipment cannot control the accuracy of the thickness very accurately.
Third, the craft
The pre-treatment effect and post-treatment effect of the ink. The pre-treatment includes solder mask exposure. The stability of the energy of the exposure machine determines whether the pre-treatment effect is good, and the post-treatment process such as ink curing will also affect the color of the ink.
Combining the above three reasons leads to the difference in PCB ink color, and it is difficult to control the improvement of thickening the ink thickness, which will lead to an increase in the amount of tin during patch processing, which increases the risk of tin connection, and the selection of ink colors before module production During work, due to the large reflective area of the pad, it is very difficult to observe the difference in ink color. During processing, a fully automatic exposure machine must be used for production. Fully automatic exposure opportunities are more stable than semi-automatic exposure machines to ensure the stability of exposure energy and require ink post-processing. The process of using UV process, UV process will better ensure the consistency of ink color than baking process. Finally, the ink color identification and selection work is carried out before and after the module production.
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