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This is an account described by David Swenson of 3M Corporation, where workers encountered a strange "invisible wall" in the area under a fast-moving sheet of electostatically charged polypropelene film in a factory.
It was Late summer in South Carolina - in high humidity, 50K ft. rolls 20ft wide was being slit and transferred to multiple smaller spools. The set-up incorporated the spool, vertical stage , then a 20 ft span, then dropping to be split and re-spooled.
An "invisible wall" was created in the space beneath -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.
Full story here -
David Swenson's electrostatic "invisible wall"
I've heard of Electrostatics causing attraction - but this was a repulsion effect & rather interesting.
It was Late summer in South Carolina - in high humidity, 50K ft. rolls 20ft wide was being slit and transferred to multiple smaller spools. The set-up incorporated the spool, vertical stage , then a 20 ft span, then dropping to be split and re-spooled.
An "invisible wall" was created in the space beneath -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.
Full story here -
David Swenson's electrostatic "invisible wall"
I've heard of Electrostatics causing attraction - but this was a repulsion effect & rather interesting.