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December 2002

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Thu, 12 Dec 2002 15:50:45 +0800
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My understanding of the low temp moisture extraction process is that it's
carried out under partial vacuum, not high vacuum, so that the moisture
neither boils off rapidly, nor freezes - either of which would cause
delamination if it were allowed to happen. My initial skepticism about the
process was relieved after I spoke to Altos Engineering further about it,
although I would want to see the process obtain industry approval or
conduct my own tests with it before I considered adopting it as a process
here.

Even if it were an approved process, the equipment is too expensive to
justify having for my little project.

Peter



"Zweigart, Siegmund" <[log in to unmask]>    12/12/2002 03:43 PM
Sent by: TechNet <[log in to unmask]>

Please respond to "TechNet E-Mail Forum."; Please respond to "Zweigart,
Siegmund"

              To:  [log in to unmask]
              cc:  (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
              Subject: Re: [TN] Vacuum








Just one comment

If you buy frozen dried food like coffee its is dried under vacuum, because
the anomaly of Water.
So if the Vacuum is high (or low) enough water will freeze because freezing
means a volume expansion and this is easier in vacuum.
If you want the get in trouble with high vacuum specialist put one drop of
water in their chambers - have fun.
One problem with drying under vacuum is also that the transport of moisture
away from the component is only possible by diffusion not by convection.

Siggi

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