Batch spraying is a simple method to apply conformal coating to a circuit board in a cost effective way.
At its most simplest you require
- Spray gun and compressed air
- The conformal coating material diluted to the right viscosity
- A suitable spray area that is dust free for the wet coating.
The Spray Process
Using a compressed air spray gun, the conformal coating is sprayed across the whole of the circuit board. If the right spray gun is used, it can produce a high quality coating finish that gives the best protection due to good edge coverage.
However, spraying is not a selective process. All parts are coated on the circuit board. Therefore, masking may be required to protect components that must not be coated.
Also, spraying coatings is a skilled process. This is no different for conformal coatings. It requires training and knowledge to achieve good quality coating finish. Setting up the spray gun with the right amount of atomisation pressure and material feed is critical to ensure a good coating finish.
Further, blending the conformal coating to the right viscosity is crucial. The wrong viscosity can produce many conformal coating defects such as bubbles, runs, ripples, and capillary effects.
However, get this right and spraying conformal coating within a spray booth is a very cost effective process for low and medium volume coating.
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