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poly bags
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From: Bert Hickman [SMTP:bert.hickman-at-aquila-dot-com]
Sent: Thursday, February 05, 1998 8:25 AM
To: Tesla List
Subject: Re: poly bags
You get 3 points for running an experiment and taking some measurements,
but 0 points for advance research. :^)
Check out the archives for capacitor construction - there's LOTS of
excellent details and tips on plate, rolled, and even freezer-bag caps.
Freezer bags are LDPE, and they have been succesfully used for capacitor
construction... however, it does take LOTS of bags, and ignificantly
more than 16.2 mils of poly to withstand the RF voltages seen in Tesla
Coil Service, especially if driven by 15 kV RMS.
While your breakdown test did give you some indication of 60 Hz
breakdown capability, it also gave you overly optomistic results for RF
tank-cap use. You also want to use a minimum of two dielectric layers
between plates in your capacitor construction so that any defect will in
one dielectric will not cause immediate punch-thru and failure of the
cap. And you did use mineral oil to control corona??...
Safe cappin' to you... whatever your name is... BTW what IS your name??
-- Bert --
Tesla List wrote:
>
> ----------
> From: Someone [SMTP:fox-at-netunlimited-dot-net]
> Sent: Wednesday, February 04, 1998 5:32 PM
> To: tesla-at-pupman-dot-com
> Subject: poly bags
>
> to whom it may concern. i e-mailed ziploc and the
> thickness of their plastic poly bags are as follows
>
> sandwich-1.15 mil
> ziploc storage-1.75 mil
> ziploc freezer- 2.7
>
> i dont know whether they are high or low density but they are
> polyethylene.
>
> a side note. i stuck 6 layers of the gallion freezer bag size (2.7x6) in
> my gap and fired it on
> a 15 kv tranny and it didnt break through. so i built 6 caps in series
> with one layer in each
> but i saw somewhere that you need at least 90 mils of poly for tesla
> work. im a little
> hesetant to test my new caps now.