James,

Have you considered using a laser cut or milled steel/aluminium hat that
sits ontop of the PCB.  Any clearance for components can be milled out from
the underside, and the weight of it forms a good enough seal around the
bottom.  We used this idea ffor a long time for PCB's that were panelized.
The hats were made into a large spider web style with hats adjointing to it.
You simply dropped it over the respective components and in one go, we
masked about 30 components/connectors etc.

Cheers

Mike

-----Original Message-----
From: Marsico, James [mailto:[log in to unmask]]
Sent: Friday, 25 January 2002 05:24
To: [log in to unmask]
Subject: [TN] Masking for Conformal Coating


Hello again...

Looking for suggestions for removing masking material (tape or liquid) which
is applied to mask areas from conformal coating.  The way we do it now, the
operator masks off the area (usually tape), sprays the board, cures the
coating, scores the coating around the tape, then removes the tape.  We're
trying to eliminate the scoring of the coating since this has potential of
cutting through traces.  Removal of the coating prior to curing doesn't work
because the coating runs during the heat cure process.  I'm trying to avoid
room temperature cure since this is very time consuming.  Ant suggestions?

Jim Marsico
Senior Engineer
Production Engineering
EDO Electronics Systems Group
[log in to unmask] <mailto:[log in to unmask]>
631-595-5879

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