Sometimes we see spots on the double treat copper foil we use after lamination.  We
think it is process chemistry caught in blind pores through the treatment.  We too use
Gould foil.  We reduce these "spots" by vacuum baking before use.

Chuck Brummer
Acuson

Ed Cosper wrote:

> This is interesting . We too have started ( only recently ) to see this
> condition on our double treat foil. We have found that it has only occurred
> on Gould foil. This condition causes serious issues at AOI.   In addition,
> this condition has corresponded with a notable change in the appearance of
> the treatment. We have recently noticed that the double treat material has
> been coming in two toned and in some cases much darker overall.  We have
> found the breakdown of the edges has been limited to the discolored double
> treat.  so far anyway..........
>
> Please contact me off line for our solution to the problem as it is related
> to a specific supplier requirement.
>
> Ed Cosper
> Director Quality Assurance and Engineering
> American Board Company
>
> -----Original Message-----
> From: Anne Ledger <[log in to unmask]>
> To: [log in to unmask] <[log in to unmask]>
> Date: Tuesday, August 17, 1999 9:19 AM
> Subject: [TN] Innerlayer issue
>
> >Good Morning Technetters,
> >
> >I have a question for board fabbers.  Problem:  We are experiencing
> >weave texture on our innerlayer material.  I have spoken to the
> >manufacturer who states that weave does shift in the "pour" of the
> >material (when the resin is added) and that there is no specification
> >that controls the depth requirement of the weave.  The topography is
> >visual prior to lam/image.  The condition is causing our resist to lift
> >slightly and allows an etch stain on the double treat foil that so far
> >we can not remove.  Question:  Is this a typical condition of innerlayer
> >material (other manufacturers)?  Is it double treat foil only?  Is there
> >a way to remove this type of etch stain?  What is the acceptablity of
> >stain on inner layer foil?  I can't find any reference info in IPC.
> >
> >Any and all input would be appreciated.
> >
> >Anne Ledger
> >EMDS, Inc.
> >
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