Florian,
it is not unusual to do a second pass with LPI soldermask. We have
implemented this process years ago using a white LPI ink over the already
green
LPI. You want to make sure that the first pass is fully cured before
applying
the second pass. The reason we apply this process is for 3oz. copper plated
traces for it is very difficult to silkscreen 6 mil wide characters over
these high
traces.
----- Original Message -----
From: F.Pitzl <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, April 19, 2001 2:38 PM
Subject: [TN] Improved SlkScreen requirements


> Hello,
>
> At this day I was asked by our engineer if it is possible to put a
> additional silk-screen onto the board.
> This additional silk-screen has to be in a different color than the
> board and the normal one. Even it should have the same clearance and
> minimal line width requirements as a Solder Mask. For this it must be a
> photoimageable process.
>
> What would you say to this issue ?
> Is it possible to run a second "SolderMaskProcess" with a different Mask
> and color and how much would it cost on your opinion ?
>
> Regards,
> Florian Pitzl
>
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