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The differences need to know between the FPC assembly and Rigid PCB assembly

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The differences need to know between the FPC assembly and Rigid PCB assembly

Ordinary SMT processing is basically the same, because the flexible circuit board, Rigid-Flex board and Rigid board all need the component placement and reflow soldering paste welding process. However,as to the Flexible PCBA and Rigid PCBA there is some details specially, if the extra details are not handled properly, then there will be tremendous problems.

Then, let’s move to the details as follow:
1. solder paste welding process
Just like the Rigid PCB assembly process, using the stencil and the solder paste to cover the Flexible Printed Circuit Board and Rigid-Flex PCB with solder paste. Many SMT workers are troubled by the size and the fragileness, differ from the Rigid PCB, the surface of Flexible PCB is not smooth, then need some fixtures and positioning holes to fix. Moreover, the FPC material is not dimensionally stable and will stretch or fold by 0.001 degrees per inch as a function of temperature and humidity changing. More interestingly, these stretching and wrinkling factors will result the FPC displacement in the X and Y directions. Due to this, the FPC assembly requires smaller carriers comparing to the Rigid PCBA.

2. SMT components placement
Under the trending of miniaturization of components, tiny components in the reflow process happens to some problems. If the line width of FPC is narrow, stretching and wrinkling will not be a significant problem, it need a smaller SMT carrier or additional Mark points. The carrier is not smooth also leads to displacements. SMT fixture is the main reason to keep the FPC SMT surface smooth.

3. reflow process
Before reflow soldering, the Flexible PCB must be dry, this is the main differece between the Flexible Circuit board SMT and Rigid Circuit board SMT. Besides the instability of the FPC materials, they are also hygroscopic and absorb moisture (up to 3% by weight) like sponges. Once the FPC absorbs moisture, it has to stop the flowing. Rigid PCB also has the same problem, but Rigid PCB has a high tolerance. Flex PCB require a preheat bake up to 225°-250 ° F, this process need to finish quickly within 1 hour. If it is not baked in time, then needs to be stored in a dry or nitrogen storage compartment.

We Bright PCB Technology a China FPC aseembly factory always cares about all the details above.Work with us to produce more excellent products. You are warmly welcome to CONTACT US!

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tmliir Jun 08, 2015 FPC, PCBA&SMT&PCB Assembly 0 Comment Read More

Bright PCB Technology experienced on prototyping Flex PCB(FPC)

We Bright PCB Technology has years of producing FPC, with our experienced guys serves hunders of clients who need Flexible Circuit Board. Our products including the Single layer FPC, double sided FPC, and multilayer FPC, moreover, many clients need the FPC assembly, that is most of the SMT factory not familiar with. Fortunately this is our advantage, 80% of our FPC clients chose us to finish the FPC assembly, because we take care of every single detail about the processes of FPCBA.

Single layer FPC is most using in the lighting industry and display industry as a light provider device’s part. We take very care about the feature of these industries, the stableness, long life span, proper conductivity are the main features of the FPC used in lighting and display. A pic of our product below:

bright-pcb-fpc-black-solder-mask-white-silk-enig

 

FPC prototyping means fast producing, quick test and immediately delivery.

With our professional equipment, we can efficiently do the drilling, PTH, lines, etching, etc. And applied the flying probe machine, fast test is available. FPC prototype in 3 days is abusolutely ok for us, and this service helped our client faster their product exploring.

And self-owned lines of surface treatment helps us to control the quality of OSP, ENIG on the surface of Flexible Circuit Board.

If need FPC prototype including Single layer FPC, Double sided FPC or Multilayer FPC, pls contac us immediatly! Also FPC assembly is available. Know more about the FPC assembly pls view this post: The differences need to know between the FPC assembly and Rigid PCB assembly

Copyright Notice: All images and text on this site are protected by copyright. Can be used ONLY by written authorization with signature and stamp.

 

tmliir Jun 19, 2014 FPC, PCB 0 Comment Read More
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