Hi Inge:
                   Humidity may contribute to the problem, but I would
look at the coating material. Is it past due? Is it too viscous? Are
they stored to skin in a very cold place prior to place in the oven? Try
another batch of humiseal and check if they are processed the same way
as always, not leaving them too long in a cold place.
        Regards,
        Ramon
         

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ingemar Hernefjord
Sent: Thursday, October 27, 2005 10:32 AM
To: [log in to unmask]
Subject: [TN] Urgent! Acrylic coating

Hi all,
I got a call from our production. They stopped the board coating. All
boards get white and superthin veils, patterned like fractals or roses.
I'm at home because of illness, so I can't participate in their work
with the problem.
I asked them for how long they bake the board before spraying, and they
told me that  no baking is made at all. Does sound wrong to me. My first
theory is humidity in some form. Humiseal, don't have the article number
just now.
Anyone who has a tip?
I'll get pics sooner, maybe I can resize them for Steve's gallery.
Thanks in advance
Ingemar Hernefjord
Ericsson Microwave Systems

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