Will someone please clarify the paragraph below ?  It states that pink 
     ring can be eliminated with a post drill bake.  It then goes on to say 
     that it cannot reseal the crack and it is only a cosmetic fix.  Isn't 
     pink ring a cosmetic issue?  Why would it be a dangerous fix if it 
     works??
     
     Also, you can have the best innerlayer treatment out there and if the 
     drilling operation is unoptimized, it will not make a difference in 
     cracking of inner layers.


______________________________ Reply Separator _________________________________
Subject: Re: Post Baking Process
Author:  [log in to unmask] at corp
Date:    1/27/97 11:46 AM


     
Post-drill bake -  A bake after drill has been shown to eliminate pink ring.  
Our work shows this is a dangerous fix.  Pink ring is caused by a chemical 
attack on innerlayer surfaces that are exposed by cracks introduced at drill. 
The bake relaxes the epoxy enough to close the crack, but it cannot reseal the 
crack.  Thus it is at best a cosmetic fix.  However in addition, the bake 
hardens epoxy smear and makes it difficult to remove.  A much better solution 
to pink ring is to use a good innerlayer surface treatment that prevents 
cracking at drill.
     

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