Application of precision dispensing in PCBA conformal coating process?

 Precision dispensing is a high-precision, programmable, non-contact or contact fluid-controlled coating technology developed in modern electronics manufacturing to meet the protection requirements of high reliability, miniaturization, and complex PCBAs. It marks a new stage in conformal coating, moving from “surface coverage” to “microstructure-customized protection.”

Application Case: Precision Conformal Coating of On-Board Charger (OBC) Control Board for New Energy Vehicles



Pneumatic spray value+ Automatic Glue Dispensing Machine SEC-DH400L

 

1.Background and Challenges

● Product:Main control board of an on-board charger (OBC) for new energy vehicles.

● Operating Environment: Faces high humidity, condensation, drastic temperature cycling (-40°C to above 85°C), slight vibration, and potential corrosion from electrolytes and coolants.

● Traditional Process:PCBA Conformal coating (polyurethane or silicone materials) is applied using traditional selective coating machines or manual spraying.

 

● Core Issues:

“Shading Effect”: The components on the board have significant height differences (e.g., tall electrolytic capacitors, short surface-mount components next to heat sinks). Traditional spraying cannot evenly cover the sides and bottom of short components, creating blind spots.

Sensitive Area Contamination: Connectors, test points, and heat dissipation areas must be kept absolutely clean. Even with jigs for masking, traditional spraying carries the risk of paint overflow and atomization, leading to poor contact or reduced heat dissipation performance.

Material Waste and Inconsistency: To ensure coverage, thick overall coating is often required, leading to material waste. Furthermore, film thickness uniformity depends on operator skill, resulting in poor batch consistency.


https://secondintelligent.com/industry-news/application-of-precision-dispensing-in-pcba-conformal-coating-process/

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