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Date: | Mon, 27 Jan 97 12:30:31 PST |
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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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