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| From [log in to unmask] Fri Aug 30 16: |
50:43 1996 |
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When we were in the board fabrication business, we did not store layers in a
vacuum with desiccant but when we used vacuum frame we would pull a vacuum
and hold it for more than 30 minutes before lamination. When we switched to
a vacuum lamination we continued to use a vacuum in the press and hold
before lamination. We also pulled a vacuum on the prepreg and back filled
it's storage chamber with dry nitrogen. The froth at the edge of the board
when down but we did not know if that was from the vacuum steps or the fact
we went to low pressure lamination when we switched to vacuum lamination.
----------
From: [log in to unmask]
To: [log in to unmask]
Subject: Vacuum Desiccating
Date: Friday, August 30, 1996 6:38AM
Has anyone done testing, or incorporated as part of normal processing, the
use of vacuum desiccating instead of baking after layer oxide coating, prior
to
lay-up and lamination. I would appreciate any information that is available.
Bob G.
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