How to Solve the Defects in the FPC Production
FPC is a thin, light, flexible circuit board, which is widely used in electronic devices such as mobile phone, laptop and cameras, etc. However, FPC manufacturers sometimes have defective boards in the production process, so what cause the defect? How to solve these defect? 1. FPC hole have solder mask and patterns have pinholes M ain R eason: 1) FPC did not print paper in time during screen printing, resulting in too much residual ink accumulated on the screen plate, and then the residual ink would be printed into the hole under the pressure of the scraper. 2) If the screen mesh number is too low, it will also cause solder mask in the hole. 3) There is dirt on the photographic plate, which will cause the part of the FPC that should be exposed during the exposure process to lose light , resulting in pinholes in the patterns . Solution: 1) The paper should be printed in time and the high-mesh scr...