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January 2005

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From:
"Randy Bock Sr." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Thu, 13 Jan 2005 12:10:11 -0500
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Butter Coat,  as in plastering or laying brick

Randy Bock Sr.
Quality Manager
Pitney Bowes
AddressRight Printers
(email)  [log in to unmask]
Newtown Building 2
203 270-4931  Ext
    8-426-4931  In
203 270-4982 Fax




Ryan Grant <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
01/13/2005 11:52 AM
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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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