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Page 64


www.us- tech.com


October, 2019


Coordinating Conformal Coating,


Inspection and Curing Streamlines and Improves Coating Results


By Camille Sybert, Product Marketing Engineer, Nordson ASYMTEK, and Giancarlo De La Garza, Manager, Global Business Development — Optical Products, Nordson YESTECH


stringent requirements for precision, selective coating, exacting fan width, coating thickness, tight keep-out zones, and speed, while considering environmental concerns for fluid handling and disposal. Conformal coating contributes


T


to product quality and reliability, but it is typically viewed as a process that tolerates sufficient results, or “good enough.” That view is changing as more advanced and diverse elec- tronic products enter the consumer marketplace, from the Internet of Things (IoT) to self-driving vehicles. Although conformal coating is


often an automated, high-speed, inline process, coating inspection is usually a manual process. Some con- formal coatings used by electronics manufacturers contain UV indicators to enable coating inspection. Since coatings are transparent, parts must be viewed under ultraviolet or black light to verify coverage and non-cov- erage.


he conformal coating process has continually evolved to accommodate


increasingly


Coating Inspection: Manual vs. Automated


Automated coating inspection


(ACI) systems are a relatively recent addition to the assembly process, though manual inspection is still the most prevalent form of inspection. In a manual process, operators inspect


coated boards for adherence to keep- out zones, accurate coating thick- nesses, the existence of bubbles, and consistent coverage. This requires a high level of skill and experience that is honed over time. When verifying coating thickness manually, operators must learn to


visually assess the level of light or “glow” emitted from the coating mate- rial under UV light. Although an oper- ator can achieve an acceptable level of qualitative accuracy, it would not be possible to match the accuracy of auto- mated inspection. Like any manual process, it is difficult to achieve repeatability. Results vary from opera- tor to operator and human error is unavoidable. Other concerns include exposure to chemicals and fumes affecting operator safety and damaged boards due to frequent handling. Automated coating inspection


comes in two modes: large-area grid inspection mode (auto-tune) and individual part inspection mode. In auto-tune mode, the system


When verifying coating thickness manually, operators must learn to visually assess the level of light or “glow” emitted from the coating material under UV light.


scans known good boards and the software “learns” the variations across coated areas to capture the passing criteria. This method is excellent for quick inspection recipe development. The system’s automat- ic learning capabilities enable the inspection of coated and non-coated areas within minutes of scanning the


Continued on next page


See at SMTA Guadalajara, Booth 138


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