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| From [log in to unmask] Tue Jun 11 09: |
22:10 1996 |
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Lyle
We experienced the same problem with polyimide. We added copper pads
around the NPTH drill diameter OR Drill NPTH while copper is still on
the board prior to etch. This eliminates the haloing.
Roxanne Tovey
______________________________ Reply Separator _________________________________
Subject: FAB:haloing
Author: [log in to unmask] at esdigate
Date: 6/6/96 8:20 AM
We are 2nd stage drilling .220" to .250" holes at NC rout and experiencing
.020" to .030" haloing/delamination. The 2nd drill is in areas of bare
laminate (no metal pad or ground plane). Does anyone have suggestions to
prevent this? Thanks for any input.
Lyle Anderson
Electrostar-Utah
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