OOF!

Whittaker, Dewey (AZ75) wrote:
> 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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