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Old 16th July 2009, 10:04 PM   #121
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Default Re: Corona Treatment Electrode

Quote:
Originally posted by bolserst



You might take a look at US Patent 4693869 to get an idea what electrode geometry might work well for attaching to a tesla coil for surface treatment.

http://www.google.com/patents?id=S2w...ad=0_0#PPA1,M1

Looks like the inventor disclosed an improved form of one of his electrodes in a follow on US Patent 5128547

http://www.google.com/patents?id=5E0...mary_r&cad=0_0
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Old 16th July 2009, 11:42 PM   #122
Few is offline Few  United States
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Sy: I can certainly understand your concern about the heat output of most high intensity UV lamps. It's a good point, especially when considering the application to thin mylar.

bolserst: Thanks for the links. Very interesting. I'll have to take a look at the Tesla coil I have access to and see if I can figure out what frequency it operates at.

Few
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Old 17th July 2009, 02:43 AM   #123
SY is offline SY  United States
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Few, the one we tried was microwave-powered, so runs cooler than typical mercury arcs. It would still turn a 0.6 mil film to bacon, and only get to 35 dyne or so.... The company that was proposing it (this was a beta unit) gave the product up, not surprisingly.
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Old 17th July 2009, 07:56 AM   #124
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Quote:
Originally posted by Capaciti


Now I use EC-Coating from martin-Jan and my experience of about 200 ESL's produced is the same way excellent. The only thing to mention is, that it took me a lot of trials to get it applied without stripes in the coating. Those stripes might not be critical functional, but i want thecoating to look as perfect as possible.

Summary: If you need a coating that works, last long, easy to apply.......take EC-Coating.
So what did you do to apply the coating without stripes?

I agree that the EC coating is pretty good, although I would prefer a coating with a lot higher surface resistance! I suppose I don't have to explain why? But those do not seem to be available, except the nylon stuff. I suppose it's too hard to make a reliable coating of around 1E11?

I wish I knew more about chemicals (my background is physics, not chemistry)...
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Old 17th July 2009, 08:44 AM   #125
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Hello Arend-Jan,

Not everybody likes the very high resistance.
I had to make a decision as keeping several types of coating on stock would be a dead end. The value I choose seemed to be the most alround.

Martin-Jan
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Old 17th July 2009, 08:55 AM   #126
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Hi Martin-Jan,

but could you make a coating around 1E10-1E11? I would most definitely be interested in that! Did you see the earlier thread on distortion?

S/R and distortion
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Old 17th July 2009, 09:18 AM   #127
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Hello Arend-Jan,

I have yet to see measurements of ESLs (with a high resistance bias-resistor, also acting as a safety device) which actually proves that around 10exp9 is not high enough in reality. I am aware of the distortion theory but other issues are important as well. Although possible I had to decide, as we are talking about a DIY niche market and I have other things to do as well.
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Old 17th July 2009, 09:23 AM   #128
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Hi Martin-Jan,

I did do the measurements, they are in the thread that I pointed to. Or do you find them lacking in some way? I don't mind doing additional measurements if you tell me how they could be improved upon.
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Old 17th July 2009, 09:27 AM   #129
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Clearly I have missed something
could you spare me time by providing the link?
Thanks
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Old 17th July 2009, 10:22 AM   #130
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The link is here: Asymmetric construction induced distortion in electrostatic speakers

Wachara C.
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