role of encapsulation in flex circuits
A flex circuit is an electronic circuit that can bend. These types of circuits are used in many different products from calculators to cell phones, printers and LCD televisions. They can also be found in medical devices such as heart monitors and pacemakers and in industrial applications such as robotic arms, processing machines and bar code equipment.
These flexible circuits are able to improve product design and functionality by fitting into small spaces while still providing adequate power supply and signal paths. However, a flex circuit can present challenges in production as it is hygroscopic and sensitive to environmental conditions during the assembly and reflow process. SigmaTron International, a contract manufacturer of printed circuit boards and flexible circuits has taken steps to address these issues and help reduce the risk of failure during production.
One of the main factors affecting the lifespan of a flex circuit is how it is stored. It is important to keep it in a dry environment, with low humidity and temperature. It should also be protected from contaminating materials such as dust and chemicals.
What is the role of encapsulation in flex circuits?
When storing a flex circuit, it is best to use a protective wrap or case. This will prevent damage to the board from heat, moisture and other elements that can cause it to become brittle. Keeping the circuit clean will also extend its lifespan.
Another factor in a flex circuit’s longevity is how it is handled during the fabrication and reflow process. It is important to avoid bending the circuit or handling it roughly, as this can damage it. Instead, it should be handled carefully and handled only when necessary to perform a specific function. This will keep the flex circuit safe and in good condition for its intended usage.
It is also important to use the proper layout when designing a flex circuit. This will ensure that all the components can fit and that the circuit can flex. The layout should be designed in such a way that it will allow for a smoother soldering and assembly process when it is ready to be used. It is also important to use rounded corners when possible, as sharp angles can result in stress and cracks.
Conductors on a flex circuit should be run perpendicular to the bend. This will help reduce stress that can harm copper and lead to trace failure. It is also a good idea to stagger the conductors across a flex circuit, as this will reduce stress spots and increase the overall strength of the circuit.
Finally, a flex circuit should be baked before it is soldered. This is a critical step in ensuring that the circuit is able to withstand the rigors of reflow soldering and a wide range of bending and twisting. A bake is typically performed at 250degF for two to ten hours, depending on the thickness of the board and its design.