Hi Dom

I am not sure how they combat static on our machine, all I know is that I
havent been shocked yet. It may be because most of the process is wet, with
only the very last stage being drying, creping and rolling onto the reel.

Cheers

John.
----- Original Message ----- 
From: "Dominic Stratten" <dominic.stratten@ntlworld.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Tuesday, September 26, 2006 4:40 PM
Subject: Re: [EE]: High Speed Thickness Measurement


> Dont forget the vast amounts of static these machines generate.
>
> I used to run a paper converting machine many many years ago and the
sparks
> from the static generated by the paper unrolling, cutting and re-rolling
was
> enough to jump 3 or 4 inches.
>
> I still have nightmares to this day about walking up to the machine and
> getting zapped by a couple of hundred thousand volts lol.
>
> Dom
> ----- Original Message ----- 
> From: "Russell McMahon" <apptech@paradise.net.nz>
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Sent: Tuesday, September 26, 2006 4:57 PM
> Subject: Re: [EE]: High Speed Thickness Measurement
>
>
> >> How would you do this? I can imagine using the sheet as the
> >> dielectric
> >> between 2 plates. Would a tiny change in thickness create enough
> >> variance of
> >> capacitance to measure accurately?
> >
> > If you can maintain a sensor at a small distance above the paper as it
> > eg travels over a roller then the change in capacitance should be
> > highly proportional to paper thickness. Dielectric constant of paper
> > relative to air (1) governs how large a swing you'll get.
> >
> >
> >
> >        Russell
> >
> >
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