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Date: | Wed, 24 Jun 1998 07:35:13 -0400 |
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Hi Richard,
We have had some success with laser ablating mask from via holes.
This can be a bit challenging at set up, and not 100% successful.
Success depends on thickness, mask type, aspect ratio, surrounding
feature size, etc. We have managed to saved a fair number of boards
destined for the dumpster this way. I am assuming this is a thermoset
epoxy mask vs. LPI. LPI's can generally be chemically stripped.
Hope this helps...Andy Slade
______________________________ Reply Separator _________________________________
Subject: [TN] Fab: plug vias
Author: "Blanchet; Richard" <[log in to unmask]> at SMTPLink-Hadco
Date: 06/23/98 4:19 PM
Hello,
If the solder mask in the vias has been cured (full plug), is there any
way to remove it without damaging the boards ? There's no solder mask
on the surface beside in the vias. Thanks.
Richard Blanchet
Process Engineer, screening
Viasystems Canada Inc.
tel.: (514) 694-8900, ext. 4189
fax: (514) 694-9776
[log in to unmask]
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