The different manufacturing process for FPC
The fabrication process of flexible printed circuit board (common types of FPC ) is basically similar to that of rigid pcb board.
But for some operations, the flexibility of the laminate requires a
different device and a completely different treatment. Most FPC uses
negative methods.
However, there are some difficulties in the mechanical processing and the coaxial processing of flexible lamination. The main problem is the material pre-process treatment. Flexible materials are coils of different widths, so the transfer of flexible laminates requires the use of rigid brackets during etching.
Besides, the processing and cleaning of flexible printed circuits is more important than that of rigid plates (Lexin, 1993). Incorrect cleaning or improper operation may lead to failure in product manufacturing, due to the sensitivity of flex materials. For the regular single-sided flex board, it should be cleaned at least 3 times while 3 to 6 times for the multilayer flex boards depending on its complexity.
The third different process is that, most holes in the flex pcb using punching, which increase the cost of the flex board prototype. Drilling is also possible, but it requires special adjustment of the drilling parameters to obtain unpainted bore walls. And after drilling, we should also remove the contamination in the water cleaner with ultrasonic stirring. That is why we recommend punching for the flex board.
Usually, because of the limited thermal resistance of the substrate, crests welding should be used when welding in flexible printed circuit. The following items should be noted:
1)The board must be baked in the 250 ° F for 1 h before welding for the hygroscopicity of the Polyimide material.
2)The heat dissipation area should be reduced when the solder pads are placed in large conductor areas such as the ground layer, power supply layer, or radiator. In this way, heat emission is limited and welding is easier.
3)When manually welding pins in the dense areas, we should try to avoid continuous welding of adjacent pins to avoid local overheating.
Hope the above information will be helpful for your FPC design and manufacturing, welcome to visit our website:https://www.fastturnpcbs.com/.
However, there are some difficulties in the mechanical processing and the coaxial processing of flexible lamination. The main problem is the material pre-process treatment. Flexible materials are coils of different widths, so the transfer of flexible laminates requires the use of rigid brackets during etching.
Besides, the processing and cleaning of flexible printed circuits is more important than that of rigid plates (Lexin, 1993). Incorrect cleaning or improper operation may lead to failure in product manufacturing, due to the sensitivity of flex materials. For the regular single-sided flex board, it should be cleaned at least 3 times while 3 to 6 times for the multilayer flex boards depending on its complexity.
The third different process is that, most holes in the flex pcb using punching, which increase the cost of the flex board prototype. Drilling is also possible, but it requires special adjustment of the drilling parameters to obtain unpainted bore walls. And after drilling, we should also remove the contamination in the water cleaner with ultrasonic stirring. That is why we recommend punching for the flex board.
Usually, because of the limited thermal resistance of the substrate, crests welding should be used when welding in flexible printed circuit. The following items should be noted:
1)The board must be baked in the 250 ° F for 1 h before welding for the hygroscopicity of the Polyimide material.
2)The heat dissipation area should be reduced when the solder pads are placed in large conductor areas such as the ground layer, power supply layer, or radiator. In this way, heat emission is limited and welding is easier.
3)When manually welding pins in the dense areas, we should try to avoid continuous welding of adjacent pins to avoid local overheating.
Hope the above information will be helpful for your FPC design and manufacturing, welcome to visit our website:https://www.fastturnpcbs.com/.
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