Author Topic: "Invisible Electrostatic Wall" at 3M adhesive tape plant  (Read 5945 times)

Triple Zero

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"Invisible Electrostatic Wall" at 3M adhesive tape plant
« on: November 24, 2011, 06:55:29 pm »
"Invisible Electrostatic Wall" at 3M adhesive tape plant

CASE STUDY - LARGE PLASTIC WEB ELECTROSTATIC PROBLEMS, RESULTS AND
   CURE, D. Swenson, 3M Company
   Tremendous static charge generation on a plastic web causes unique
   physical phenomena and special problems. Solution was simple and cost
   effective.

 David Swenson of 3M Corporation describes an anomaly where workers encountered a strange "invisible wall" in the area under a fast-moving sheet of electrically charged polypropelene film in a factory. This "invisible wall" was strong enough to prevent humans from passing through. A person near this "wall" was unable to turn, and so had to walk backwards to retreat from it.

 This occurred in late summer in South Carolina, in extremely high humidity. Polypropelene (PP) film on 50K ft. rolls 20ft wide was being slit and transferred to multiple smaller spools. The film was taken off the main roll at high speed, flowed upwards 20ft to overhead rollers, passed horizontally 20ft and then downwards to the slitting device, where it was spooled onto shorter rolls. The whole operation formed a cubical shaped tent, with two walls and a ceiling approximately 20ft square. The spools ran at 1000ft/min, or about 10MPH. The PP film had been manufactured with dissimilar surface structure on opposing faces. Contact electrification can occur even in similar materials if the surface textures or micro-structures are significantly different. The generation of a large imbalance of electrical surface-charge during unspooling was therefor not unexpected, and is a common problem in this industry. "Static cling" in the megavolt range!

more plus discussion at link
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Cainad (dec.)

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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #1 on: November 24, 2011, 07:05:23 pm »
Did they just accidentally make a forcefield?

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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #2 on: November 24, 2011, 07:10:01 pm »
COOOOOOOL!
“I’m guessing it was January 2007, a meeting in Bethesda, we got a bag of bees and just started smashing them on the desk,” Charles Wick said. “It was very complicated.”


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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #3 on: November 24, 2011, 07:22:20 pm »
 :fap:
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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #4 on: November 24, 2011, 07:30:53 pm »
I am sooooo loving this century
- I don't see race. I just see cars going around in a circle.

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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #5 on: November 24, 2011, 07:53:56 pm »
I am sooooo loving this century

Weirdly, though, that happened last century, and yet no one seems to have done anything with it.
“I’m guessing it was January 2007, a meeting in Bethesda, we got a bag of bees and just started smashing them on the desk,” Charles Wick said. “It was very complicated.”


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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #6 on: November 24, 2011, 08:20:45 pm »
Must...create...invisible wall maze...
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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #7 on: November 24, 2011, 08:54:16 pm »
Must...create...invisible wall maze...

Not turning around would be kind of a bitch.
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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #8 on: November 24, 2011, 09:04:29 pm »
Must...create...invisible wall maze...

Not turning around would be kind of a bitch.

Or amusing to watch from above, while clawing a glass of scotch and cackling evilly.
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Triple Zero

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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #9 on: November 24, 2011, 09:30:13 pm »
I am sooooo loving this century

Weirdly, though, that happened last century, and yet no one seems to have done anything with it.

Yeah, 1996.

I dunno how accurate the story is, because indeed, why wouldn't anyone have done something with it?

more info:
http://boards.straightdope.com/sdmb/showpost.php?s=b06561cd9b21d94322e22d4b0705566f&p=4212704&postcount=22
HN discussion: http://news.ycombinator.com/item?id=3274335
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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #10 on: November 24, 2011, 10:02:53 pm »
Seems like they could have just hooked it up to a Van De Graaf bulb for some fun, anyhow. That's how mine worked (at a smaller scale, of course).


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Triple Zero

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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #11 on: November 25, 2011, 10:48:10 am »
apparently even if this does work, there's a danger of a "brush discharge" happening, which could electrocute people.

but seriously I don't know much about electricity, let alone static electricity.
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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #12 on: November 25, 2011, 11:24:40 am »
Seems like they could have just hooked it up to a Van De Graaf bulb for some fun, anyhow. That's how mine worked (at a smaller scale, of course).

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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #13 on: November 25, 2011, 11:40:05 am »
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Re: "Invisible Electrostatic Wall" at 3M adhesive tape plant
« Reply #14 on: November 25, 2011, 11:49:23 am »
I'm pretty sure a rubber floor would keep you safe.  Also, I'd bet a faraday suit would let you walk right through.
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