6. Tarnished surface
Since the FPC printed circuit board screen printing room is classified as a clean room, an electrostatic induction line is required at the screen printing air outlet to have the effect of absorbing fly and other dirt in the gas, so as to reduce surface waste , It is necessary to fully ensure the cleanliness level of the cleanroom and implement some work measures appropriately: such as entering the cleanroom to fully ensure the cleanliness of the operator, prevent irrelevant workers from walking in the clean room, and clean the cleanroom on time.
7, Uneven surface
During screen printing, no attention was paid to printing paper immediately to eliminate residual printing ink on the screen, resulting in uneven surface layer. The solution is to immediately print paper to eliminate residual printing ink on the screen.
8. Blur
There are regular ink dots on the edges of the pads on all FPC printed circuit boards. The reason is that the FPC printed circuit board is not accurately positioned during screen printing and the residual ink on the screen is not immediately removed and deposited on the printed circuit board. On the printed circuit board, the processing method is to use the positioning pin to fix it firmly and immediately print the paper to remove the residual ink on the screen.
9. Inconsistent colors on both sides
The result is that the number of knives for double-sided screen printing is quite large, and some are the interoperability of new and old inks. Some will use mixed new ink on one side, while the other side will be placed very heavily. For the long-term old ink, the solution is to minimize the appearance of the left and right conditions.
10. Cracking
Because in the whole process of FPC exposure, the amount of exposure was not enough, resulting in cat plague cracks on the surface, the treatment method is to measure the amount of exposure to expose the kinetic energy of the lamp, the comprehensive value of the main parameters such as the shutter speed to achieve 9-11 level exposure. In the middle of the geometric series, cracking is not easy to occur within this range.
FPC lines are commonly used in car cutting DVD, car cutting GPS guide, handheld DVD, CD-ROM, MP3, PDA notebook, point reading machine, amplifier, mobile phone, digital camera, copier, scanner, amplifier and audio , Video phone, pos cash register, network monitoring communication system and computer peripheral equipment, etc.
