Rigid Flex PCB Manufacturing from 2 to 30 Layers

Rigid-flex PCBs essentially are flexible PCBs that have rigid FR4 PCB layers. The flexible section is the internal FPC layers of the rigid-flex PCB, and rigid FR4 PCB sections scatter on the top and bottom. The exposed flexible PCBs are positions that require the flexibility of products.
The rigid FR4 sections and the flexible section are electrically interconnected. And copper used for the FPC section has to be rolled copper.
How do we fabricate rigid-flex PCBs?
We fabricate the flexible PCB layers and rigid FR4 PCB layers first. On the rigid layers, the areas for the exposed FPC are without circuits. Second, we laminate the flexible layers and rigid layers and then laser cut to remove the unwanted rigid FR4.