Short term immersion in water typically does not contribute to any
significant moisture adsorption in most PWBs. It is the longer term
exposure to humidity that causes PWBs to eventually reach saturation.
However, there are always exceptions. Simply get a precision scale and
weigh a number of pwbs prior to and after wash and record the delta. The
scales can be leased for very reasonable cost and many scale providers. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Monday, November 26, 2007 9:45 AM
To: [log in to unmask]
Subject: [TN] PCA washing

Hi Technos,

 

I need to set the process of aqueous washing on our in-line machine and
have a BIG preliminary question:

 

How to make sure that my boards are properly dried at the end of the
machine? Is the absence of water on the surface of the board, including
under the parts, a thorough indicator? Is it possible that residual
humidity be found inside the laminate?

 

Thanks for your help,

 

Ioan


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