Tara Dunn and Elizabeth Foradori of Omni PCB sit down to discuss flexible circuit coverlay options and design tips for both polyimide coverlay and liquid photoimageable coverlay. For further info, they can be reached at www.omnipcb.com
JJS Highlights Significance of Baking Prior to flex Printed Circuit Assembly
UK-based JJS Manufacturing is an EMS company that makes a speciality of end-to-end purchasing, manufacturing (Printed Circuit Board assembly, box build, cabinet, electro-mechanical) and supply chain solutions. The corporation supplies complicated, well configurable, low-to-medium-volume industrial electronics products across an array of industrial sectors including industrial automation, process control, test and measurement, and laboratory technology.
Editor Stephen Las Marias chatted with Russell Poppe, director of technology, concerning the issues of addressing flex circuit assemblies and provides techniques to tackle them.
Stephen Las Marias: From your experience, what are the primary complications in flex circuit assembly?
Russell Poppe: From an assembly point of view, baking the flex circuits prior to manufacturing assembly is important because they can be at the mercy of delamination. Even so, baking any Printed Circuit Board prior to manufacturing is best practice and some thing we continually do at JJS.
One of the largest complications in flex circuit assembly is making certain the circuits stay flat, particularly during the printing and pick-and-place processes. The components of the circuit in need of SMT placement ought to have an FR-4 stiffener designed in underneath; nevertheless, it’s important to work with the Printed Circuit Board provider beforehand. Getting the panelization right is vital so that the boards don’t bend when the components are placed or when they go through reflow. Panel design can be a difficult task as flex circuits are often times strange shapes! It may also be essential to have a unique carrier or pallet to hold the flex circuits in place through the process; nonetheless, these carry increased costs-usually several hundred pounds each.
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