Why does flexible PCB need stiffeners?

When I browsed some comments online, I see someone recommends stiffeners to apply on flexible PCB. Very confused about that? Is it a formal design?

PCB Assembly
September 25, 2023

The whole point of flex boards is to be flexible, and you pay a lot extra for that.

It doesn’t make any sense to pay extra for a flex board and then pay again to put stiffeners on it to make it stiff again.

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.

Oliver Smith

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