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December 2000

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 27 Dec 2000 12:01:30 +0200
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Sounds as if it may be that someone has no face mask on when coughing
(serious). I had this happen once in a former life. Took a week to track
it down.

Brian

Franklin D Asbell wrote:
>
> Happy Holidays people... hope things are going well for everyone...
>
> I have some questions regarding lifted resist problems, our Process
> Engineer is quite convinced we have a resist lifting problem due to the
> double-treat and drum-treat laminates we purchase.
>
> What we have been seeing are very isolated areas of resist lifting after
> developing, areas down space lengths around 50 75 mils long. I have not
> seen any total separation from the copper but I have seen lifted edges,
> again, in very isolated areas, typically not more than 1 instance per
> panel, and then only on appr 10% - 15% of the total panel lot.
>
> We identify this at AOI prior to etch.
>
> I don't have the camera here or i'd snap a few pics for you, even then I
> don't think it'd turn out well as they are very small areas.
>
> Anyway, I find it hard to believe contaminates on foil, responsible for
> lifting resist can occur in such minute areas and so infrequent
> throughout the lot.
>
> Any assistance would be appreciated, thanks
>
> Franklin D Asbell
> Network Circuits
> Irving, Texas ~tucking the Cowboys banner down under the desk, out of
> sight, grin~
>
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