This is an old term and critical process with no margarine for error.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Ryan Grant
Sent: Thursday, January 13, 2005 9:52 AM
To: [log in to unmask]
Subject: [TN] Butter coat


Hi Technetters,

I just learned a new PCB fabrication term today..."butter coat".  It's
supposed to be thin layer of resin between glass cloth bundles and
conductors to assure reliability.  In the few shop audits I've been
through, I've never seen or heard of a "butter coat".  What would the
process look like?  Is the resin pressed and frozen into a sheet that
can be handled or would it be squeegy'd on?  If it is squeegy'd, can
that be performed by hand or must a machine do it?  If a machine must do
it, how do you lay up the brick for the press?  Finally, is this a
standard process that I've just been unaware of?

Thanks,
Ryan

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