View of Vacuum Coating

Exit template view of a remote vacuum coating head

The amount of vacuum applied to the system regulates the resulting coating thickness applied to the board. In a perfect system too much vacuum would remove all the coating from the board leaving none behind at all. Conversely, a non-existent vacuum would allow the coating head to fill sufficiently with coating where it would run out of the space created between template and product.
Vacuum coating differs from vacuum deposition in that the vacuum employed here is intended to vary the amount of coating by sucking off the excess and creating varying coating thicknesses between 0.001 and 0.008 in (25 and 200 µm) in thickness. Vacuum deposition is applying a coating while the substrate is under a vacuum and applies the coating in very precise layers.

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