Become a Flex Circuit Manufacturer
In today’s world of advanced technology, virtually every product with an on/off switch has a circuit board inside it. While manufacturers and consumers are accustomed to seeing circuit boards in their traditional flat form, new ergonomic product designs and the rise of wearable tech are creating demand for circuits that are more flexible. Flexible printed circuit boards (commonly known as flex circuits or flex PCBs) are designed to meet this need, by combining flexible materials with rigid-flex design rules.
To create a flex circuit manufacturer, the first step is to design the circuit using computer-aided-design (CAD) software. This includes designing the layout, placing components, and specifying any requirements for bending or flexing of the circuit. Once the design is complete, it is sent to a PCB manufacturer for fabrication.
Various types of materials can be used to make flexible PCBs, including conductive copper foil and polyimide, both of which are common choices for their combination of flexibility and durability. Copper is the most common conductive material, but other metals, such as aluminium and nickel are also used in some applications. For a flex circuit, it’s important to consider the specific environment and use case for the circuit before choosing a material. For example, if the circuit will be subject to dynamic movement, it needs to be able to bend and stay in place with minimal damage. In this situation, a thin polyimide that can be etched with tight line and space widths is ideal.
How to Become a Flex Circuit Manufacturer
In addition to selecting the appropriate substrate material, it is necessary to consider how the flex circuit will be routed. This will help determine the layer count, whether any of the layers are required in a rigid section, and how many of the layers will be buried in solder mask. Once the flex circuit is fabricated, it is coated with a protective coverlay, which insulates the outer surface conductors and protects them from corrosion and damage, much like solder mask does on a rigid board.
The final step in the manufacturing process is to cut the flex circuit from the base material with a blanking knife. In high-volume production runs, this is typically done with a hydraulic punch and die set, which can involve fairly expensive tooling costs. However, for prototypes and low-volume production runs, a blanking blade that is bent into the shape of the flex circuit outline is used. Once the flex circuit has been cut, it is then affixed to a routed slot on a backing board and inserted into a tool that is capable of pressing out the circuits with a consistent, rounded edge, as opposed to the sharp edges that would otherwise be created by manually handling the flex material.
As with any PCB, it is critical to thoroughly inspect a finished flex circuit for quality and functionality. It should be free of any kinks or creases, which could interfere with the signal flow and cause electrical problems, and it should also be free of any scratches, marks, or other defects that would compromise the integrity of the board. If any defects are discovered, they must be corrected as soon as possible to avoid any future issues with the flex circuit.