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how to calculate stiffener thickness for flexible circuit boards

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AdvanceCircuits

AdvanceCircuits

Member
Joined 2021
pcbonline.com/
#1
I did some research and wrote an article about flexible PCBs' stiffeners here: What Are Flex PCB Stiffeners - The Easiest Guide [2021]. But in fact, I don't design circuit boards though I work in this industry. I know that manufacturers follow the designer's thickness requirements to make the FPC stiffener. But how do you guys decide its thickness? PI doesn't affect the board's final thickness, but the FR4 is thicker than the FPC itself.
flexible-pcb-with-stiffeners.jpg
 
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