Skip to comments.Lasers can 'unprint' documents
Posted on 03/17/2012 3:48:22 PM PDT by U-238
British researchers say they've developed a laser process that can "uncopy" toner ink from paper as an alternative to traditional recycling.
Scientists at the University of Cambridge say the process involves short laser pulses to erase words and images by heating the printed material to the point that it vaporizes.
The technique works with commonly used papers and toner inks and is more eco-friendly than recycling, they said.
"When you fire the laser, it hits the thin toner layer and heats it up until the point that you vaporize it," researcher David Leal-Ayala told the BBC.
"Toner is mostly composed of carbon and a plastic polymer. It's the polymer in the toner that is vaporized."
Tests carried out on the resulting "unprinted" paper suggested it had not sustained significant damage and was "comparable to blank unlasered paper," the researchers said.
Reusing rather than recycling paper would be good for the environment, they said.
"When you recycle paper you use a lot of resources," Leal-Ayala said.
"You use electricity, water and chemicals, and to be honest when you print something the only reason that you don't re-use the paper is because there is print on it.
"The paper is still in good condition and there is no point in going through all the heavy industrial process if the paper is still perfectly fine."
(Excerpt) Read more at spacedaily.com ...
We don't need no steenkin' shredder!
great, just think what the government can do to your personal infomation
contract? what contract?
"Hey Doogle, I found this "R" laying on the floor from previous post"
A buddy of mine was in a heavy metal band in the 80’s and in a drunken debauch got a massive tattoo on his shoulder. It was awful. Unbelievably bad in design, the lines were blurred, color was garbage. I’ve seen prison tats that looked better than this.
He just finished his last laser removal session — they burn the ink out of your skin. It vaporizes and he said it felt like his skin was on fire at the end of each session. But the tat is gone now with only a faint ghost. So to answer your question, it’s already been done.
Try that on the NY Times.
I do not think it would work on newsprint. But I am not completely sure about that.
How about a flamethrower?
Enviro-Nazis plotting again. Who is paying for their "research"? Duplex printing will not be enough for them?
You can the abstract of the paper here:
Toner-print removal from paper by long and ultrashort pulsed lasers
David Ricardo Leal-Ayala1, J. M. Allwood1,*, M. Schmidt2 and I. Alexeev2
1Low Carbon Materials Processing Group, Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
2Lehrstuhl für Photonische Technologien, Paul-Gordan-Straße 3, 91052 Erlangen, Germany
So I can buy a “de-laser” machine ,, buy a cashiers check for $10 , de-laser it ,, and imprint my new amount ,, say $100,000.00 and change the recipient at the same time.. cool.
Actually the laser heats the ink particles and explodes them into smaller particles that your skin cannot retain , they get flushed out by your kidneys ..
But there is security devices in checks such as watermarks.
The man who designed those watermarks in checks is Frank Abagnale Jr. whose life was made into the movie “Catch Me If You Can”.
Except that carbon in the air is not really a significant problem. And the volume of carbon in paper used at today's (declining due to advances like e-book publishing) rate is such a microscopic fraction of the earth's natural carbon load that you could never measure the effect of your proposal.
And don't try to lay any "global warming" BS on us!
If you are truly commited to stopping "AGW" -- stop breathing!
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.