Rigid Flex PCBs: Design Freedom and Space Savings for European Industrial Equipment

Rigid-flex PCBs -- boards that combine rigid substrate areas with flexible polyimide connection sections -- are increasingly specified in European industrial equipment as designers seek to reduce size, improve reliability, and eliminate connectors in product designs. While rigid-flex technology has been used in aerospace and military applications for decades, its adoption in commercial and industrial equipment has accelerated as the technology has matured and unit costs have declined.

A rigid-flex PCB is a PCB construction that combines rigid substrate sections (typically glass-reinforced epoxy, the same material used in conventional rigid PCBs) with flexible polyimide sections that provide dynamic or static interconnections between rigid areas. The flexible sections can be bent during assembly to connect boards at different angles, or folded to package the electronics in a smaller three-dimensional envelope.

The key structural difference from a conventional rigid-multilayer-plus-discrete-wire approach is that the rigid-flex board is a single, continuous multilayer structure -- the flexible section is not a separate piece connected by connectors, but an integral part of the board construction.

The primary drivers for rigid-flex adoption in industrial equipment are space savings and weight reduction. In compact industrial designs -- including handheld instruments, sensors with integrated electronics, and space-constrained control modules -- the ability to fold the PCB to fit the mechanical envelope can reduce the product volume significantly. Eliminating discrete connectors between boards reduces both the board area required and the assembly complexity.

European industrial designers specifying rigid-flex PCBs for the first time should be aware that the design rules and manufacturing constraints for flexible sections differ significantly from rigid board design. Minimum bend radius, number of allowable bend cycles, and the routing of traces through the bend area all require specific engineering attention. Working with a PCB supplier with demonstrated rigid-flex experience during the design phase is strongly recommended to avoid manufacturability issues that could delay the project.

Conclusion: Selecting the right multilayer PCB supplier requires evaluating manufacturing capability, quality certifications, and the ability to scale from prototype to mass production. Dongguan Xingqiang Circuit Board Technology Co., Ltd. has been serving the global PCB market since 1995, with two production bases covering 205,000 square meters and a monthly capacity of 200,000 square meters. Products are certified to ISO, CE, and ROHS standards.