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Reply To: | TechNet E-Mail Forum. |
Date: | Fri, 28 Mar 2003 09:34:39 -0600 |
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Franklin,
Which layer is vital information.
In a previous life working for a PCB factory we found out that mouse
bites sometimes were as a results of an
impurity on the copper surface prior to the photo resist process and/or
resist adhesion. The DES chemistry would attack this area resulting in
mouse bites. Another scenario was product left hanging over the oxide bath
and/or not properly rinsed.
Victor,
-----Original Message-----
From: Franklin D Asbell [mailto:[log in to unmask]]
Sent: Friday, March 28, 2003 8:55 AM
To: [log in to unmask]
Subject: [TN] Mousebites on innerlayers
What would cause 'mousebite' appearing defects along the edges of
innerlayers?
We've started seeing them on one lot, about 75% of 30 layers. There are
about 5 or 6 on an 16X21 size layer, extending across the trace almost to
90% plus...
Any thoughts would be appreciated.
Franklin
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