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Re: foil-paper-poly
---------- Forwarded message ----------
Date: Tue, 7 Oct 1997 07:37:17 -0400
From: Thomas McGahee <tom_mcgahee-at-sigmais-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: foil-paper-poly
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: foil-paper-poly
> Date: Monday, October 06, 1997 11:51 PM
>
>
>
> ---------- Forwarded message ----------
> Date: Mon, 06 Oct 1997 10:00:56 -0500
> From: David Huffman <huffman-at-FNAL.GOV>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: foil-paper-poly
>
> Hi All,
>
> I have some kraft paper for my poly caps but still have some
questions.
> Should the paper only go between the foil and the poly? My caps
will have
> three layers of 8mil poly and paper between the foil and the poly,
but would
> it be wrong to put the paper between each poly layer too. That is
> foil-paper-poly-paper-poly-paper-poly-paper-foil. The paper is
2.5mil thick
> and should wick the oil nicely. I plan to bake the paper in the
oven at
> 250deg to remove any moisture and vacuum the air out of the
capacitor
> assembly.
> As always any thoughts are appreciated.
> Dave
Dave,
I have put paper between ALL poly surfaces. The rational is that we
are using the paper to reduce the presence of air bubbles ANYWHERE in
the cap.
By the way, when I disassembled such a cap recently there was
evidence of corona only on the paper sheets that touched the foil
plates. The paper between sheets of poly was untouched.
When heating up the paper do not char it in any way, as you do not
want carbonization.
Hope this helps.
Fr. Tom McGahee