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Date: | Fri, 14 Jan 2005 11:13:49 +0200 |
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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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Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
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