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Old 30th December 2009, 08:00 PM   #221
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Hi Folks,

i do not understand what the video is trying to show.

Is this just heat treatment of the PET-membrane ? PET will never withstand "true" 275C, destruction point is about 190 C

Where is the melted nylon in the video ?

Capaciti
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Old 31st December 2009, 12:40 AM   #222
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Quote:
Originally Posted by Capaciti View Post
Hi Folks,

i do not understand what the video is trying to show.

Is this just heat treatment of the PET-membrane ? PET will never withstand "true" 275C, destruction point is about 190 C

Where is the melted nylon in the video ?

Capaciti
The melting point of nylon 6.6 = 265 C, and used it in my cover
Here is the link: Polyamide nylon PA yarns, fibers, flock and monofilaments
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Old 31st December 2009, 01:36 PM   #223
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Default The improvement nylon coating

Quote:
Originally Posted by Capaciti View Post
Hi Folks,

i do not understand what the video is trying to show.

Is this just heat treatment of the PET-membrane ? PET will never withstand "true" 275C, destruction point is about 190 C

Where is the melted nylon in the video ?

Capaciti
This improvement nylon coating. After melting nylon acquires all the physical and electrical properties (nylon restored after dissolution, the dissolved form), the coating becomes thinner and easier to reliably kept adheres to the Mylar (PET film), improves the electrical resistance for high breakdown voltage.
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Old 31st December 2009, 02:36 PM   #224
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Quote:
Originally Posted by Capaciti View Post
Hi Folks,

i do not understand what the video is trying to show.

Is this just heat treatment of the PET-membrane ? PET will never withstand "true" 275C, destruction point is about 190 C

Where is the melted nylon in the video ?

Capaciti
Apparently, the one who DARED to try has succeeded!
Hazy looking coating becomes transparent - you can observe this by "disappearence" of the coating right under the fan nozzle...
Alex
My attempts to do so yeilded fried PET - it is not that simple. It would be fare to say that that coating on fried PET was almost invisible...
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Old 1st January 2010, 09:14 AM   #225
Calvin is offline Calvin  Germany
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Hi,

I dont understand too what the vid is about. Tempering a diaphragm is common sonse in ESL building. That tempering improves certain parameters is nothing new. So wheres the beef?
Nylon keeps a certain percentage of water. And that is the basic mechanism behind its rather high conductivity compared to other plastics and it probabely accounts for the whitish apperance too. Conductivity is at the low end of what is desirable anyway. Decreasing it even further is rather contraproductive.
Heating reduces the part of water and as such optics could change to transparency and obviously conductivity must decrease, ie. the resistance increases.
I see no reason why the heating should improve the adherence to the PET-membrane and it certainly doesnt improve uniformity of the conductivity over the membrane area. And last I doubt that this process will stay for infinite. Over time the nylon will attract water till it reaches its natural balance again. Thereby resistance will decrease and optics might change too.

jauu
Calvin
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Old 1st January 2010, 09:42 AM   #226
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Could it be that the nylon (conductive or not) melts and keeps the PET film
together?

Maybe it's like a water filled PET bottle thrown into a fire, the PET wont melt as long as there is water in the bottle....
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Old 1st January 2010, 03:20 PM   #227
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of perhaps some interest - those floor finishes and all... US5091452

also it appears that the VERMASON|C901|FLOOR POLISH, DISSIPATIVE | Farnell United Kingdom is not being carried at least by Farnell...

But you can read the MSDS and see what the components are/were.
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Old 1st January 2010, 03:29 PM   #228
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i too fail to understand what is being shown in the utoobe video - where's the nylon?

What is the wire doing?? Is it measuring the resitivity under the heat gun? Why?

Let's get some real information here Statics Man? What exactly is the material, what exactly is the process, how is the "nylon" applied, and in what form!!

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Old 1st January 2010, 08:11 PM   #229
Kontra is offline Kontra  Russian Federation
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Yes it is a solution of nylon in phenol. Without water. Absolute without water. Then is fluxed and becomes diaphanous
Important - nylon is concretely liquated{fluxed}
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Last edited by Kontra; 1st January 2010 at 08:26 PM.
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Old 1st January 2010, 09:15 PM   #230
Few is offline Few  United States
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Quote:
What is the wire doing?? Is it measuring the resitivity under the heat gun? Why?
I believe the wire is a thermocouple, used to monitor the temperature near the diaphragm. I'm assuming that's why 8.5 mV = 275 C appears in the video. That's just my guess, though.

Few
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