Free Republic
Browse · Search
Bloggers & Personal
Topics · Post Article

Skip to comments.

Lasers can 'unprint' documents
http://www.spacedaily.com/reports/Lasers_can_unprint_documents_999.html ^ | 3/15/2012 | Cyberwar

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 ...


TOPICS: Science
KEYWORDS: document; lasers; paper; printer; pulsedlasers; recycling; science; technology; toner
Navigation: use the links below to view more comments.
first 1-5051-53 next last

1 posted on 03/17/2012 3:48:31 PM PDT by U-238
[ Post Reply | Private Reply | View Replies]

To: U-238

yah just try to feed used paper into your printer. not practical!


2 posted on 03/17/2012 3:57:12 PM PDT by BJ1
[ Post Reply | Private Reply | To 1 | View Replies]

To: U-238

This is good technology. Once you have bought paper and taken it to work or home and printed on it, it is a very resource intensive effort to re-collect it, take it back to a paper manufacturer in order to recycle it. I don’t think the process is cost effective, its just one of those things that makes us feel good. Having a small machine that recycles the paper right at the distributed source would save a lot of energy.


3 posted on 03/17/2012 3:57:51 PM PDT by Vince Ferrer
[ Post Reply | Private Reply | To 1 | View Replies]

To: Vince Ferrer

I agree


4 posted on 03/17/2012 3:58:35 PM PDT by U-238
[ Post Reply | Private Reply | To 3 | View Replies]

To: U-238

Somehow I’m wondering if vaporizing polymers is ‘greener’ than just throwing the stuff in the trash?


5 posted on 03/17/2012 4:00:30 PM PDT by Cringing Negativism Network ("The door is open" PALIN 2012)
[ Post Reply | Private Reply | To 1 | View Replies]

To: U-238

What about coffee stains. Will it undo coffee stains?


6 posted on 03/17/2012 4:03:57 PM PDT by Krankor (eenie meenie, chili beanie, the spirits are about to speak.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: SunkenCiv

Hi-tech palimpsest ping


7 posted on 03/17/2012 4:04:45 PM PDT by Hegemony Cricket (The emperor has no pedigree.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Krankor

“What about coffee stains. Will it undo coffee stains?”

And if so, will the same process take them out of clothing?


8 posted on 03/17/2012 4:05:59 PM PDT by ZirconEncrustedTweezers (The only thing a straight white man gets in this country is the blame for everything.)
[ Post Reply | Private Reply | To 6 | View Replies]

To: U-238

Obama and his forgers might be very interested in this process!


9 posted on 03/17/2012 4:10:49 PM PDT by Red_Devil 232 (VietVet - USMC All Ready On The Right? All Ready On The Left? All Ready On The Firing Line!)
[ Post Reply | Private Reply | To 1 | View Replies]

To: U-238

Wait til the birthers find out about this!


10 posted on 03/17/2012 4:12:24 PM PDT by douginthearmy (Obamagebra: 1 job + 1 hope + 1 change = 0 jobs + 0 hope)
[ Post Reply | Private Reply | To 1 | View Replies]

To: U-238

In old times parchments (stretched sheep, calf, or goat skins) were regularly recycled by scraping off the ink of earlier writings for reuse. Same basic concept and, except that the vaporized ink is probably not the best stuff to breathe in, pretty cool.


11 posted on 03/17/2012 4:12:34 PM PDT by katana (Just my opinions)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Red_Devil 232

Right now they are probably working on an “unlayered” version, blasting somebody’s name off and preparing to lay Barry’s name down.

Look for another “official release” to the lapdog media.

But not to a court. In original paper form, LFBC, directly from Hawaii to the court with Bammy being involved.


12 posted on 03/17/2012 4:14:03 PM PDT by F15Eagle (1 John 5:4-5, 4:15, 5:13; John 3:17-18, 6:69, 11:25, 14:6, 20:31; Rom10:8-11; 1 Tim 2:5; Titus 3:4-5)
[ Post Reply | Private Reply | To 9 | View Replies]

To: U-238

Oh goody. Once we find a way to do this with toilet paper, Sheryl Crowe can go back to using more than one square!


13 posted on 03/17/2012 4:14:32 PM PDT by Joe 6-pack (Que me amat, amet et canem meum)
[ Post Reply | Private Reply | To 1 | View Replies]

To: katana
"In old times parchments (stretched sheep, calf, or goat skins) were regularly recycled by scraping off the ink of earlier writings for reuse."

The very definition of a "palimpsest" is a page which has been reused. Most calligraphers and illuminators used gum sandarac or some other type of pumice, but Emperor Nero, who was a calligrapher in his own right, was reported to use the chopped out tongues of slaves.

14 posted on 03/17/2012 4:18:06 PM PDT by Joe 6-pack (Que me amat, amet et canem meum)
[ Post Reply | Private Reply | To 11 | View Replies]

To: U-238
If you're really worried about CO2 in the air, you shouldn't recycle paper at all. Every carbon atom in a sheet of paper was once part of a C02 molecule in the atmosphere. It's been sucked out of the atmosphere and sequestered in the paper. The thing to do with unwanted paper is bury it so deep the oxygen in the air can't get at it. That way you permanently remove it from the atmosphere. Recycling the paper passes up a chance to permanently remove carbon from the atmosphere.
15 posted on 03/17/2012 4:22:01 PM PDT by JoeFromSidney
[ Post Reply | Private Reply | To 1 | View Replies]

To: F15Eagle

I had to present a certified, raised seal and signed BC to the Texas Public Safety Officers to get a drivers lic. last week! Went home pulled it out of a briefcase and was back with in an hour. Seems Berry can’t or wont do that!


16 posted on 03/17/2012 4:23:41 PM PDT by Red_Devil 232 (VietVet - USMC All Ready On The Right? All Ready On The Left? All Ready On The Firing Line!)
[ Post Reply | Private Reply | To 12 | View Replies]

To: ZirconEncrustedTweezers

Why stop at clothes. What about tattoos?


17 posted on 03/17/2012 4:32:42 PM PDT by Krankor (eenie meenie, chili beanie, the spirits are about to speak.)
[ Post Reply | Private Reply | To 8 | View Replies]

To: U-238

It’s a good thing that lasers do not use energy

/s


18 posted on 03/17/2012 4:36:23 PM PDT by daku
[ Post Reply | Private Reply | To 1 | View Replies]

To: BJ1

What percentage of office paper people throw in a recycling bin are reusable this way? They get stapled, folded, and mutilated. They get damp, wrinkled, stained, written on with pens and markers. They get handled with sweaty oily hands, stuffed in books and briefcases, taped, and then end up wrinkled from being in the bin. I like to fold papers three time and stuff them in a shirt pocket. Would that be a crime?

Everyone would have to treat each piece like a valuable work of art and make sure to stack it neatly when its unprinting time comes.

All of this stuff sounds great “on paper” but its implementation is a different story. You’re still going to have to grind most of it up and make new paper out of ole.


19 posted on 03/17/2012 5:09:40 PM PDT by Right Wing Assault (Dick Obama is more inexperienced now than he was before he was elected.)
[ Post Reply | Private Reply | To 2 | View Replies]

To: douginthearmy

problem is. The fake BC wasn’t printed so there’s nothing to unprint lazerly.

I’d bet zero wished this lazer thing was around 36 moons ago. He could have altered the BC he found in a book... then again toner wasn’t around back then.


20 posted on 03/17/2012 5:10:36 PM PDT by 1_Rain_Drop
[ Post Reply | Private Reply | To 10 | View Replies]

To: U-238
Damn! This stuff is right up Hillary's alley (ick!)

We don't need no steenkin' shredder!

21 posted on 03/17/2012 5:13:49 PM PDT by stboz
[ Post Reply | Private Reply | To 1 | View Replies]

To: U-238

great, just think what the government can do to your personal infomation


22 posted on 03/17/2012 5:31:31 PM PDT by Doogle (((USAF.68-73..8th TFW Ubon Thailand..never store a threat you should have eliminated)))
[ Post Reply | Private Reply | To 1 | View Replies]

To: U-238

contract? what contract?


23 posted on 03/17/2012 5:31:55 PM PDT by NonValueAdded (Limbaugh: Tim Tebow miracle: "He had atheists praying to God that he would lose.")
[ Post Reply | Private Reply | To 1 | View Replies]

To: Doogle

"Hey Doogle, I found this "R" laying on the floor from previous post"

24 posted on 03/17/2012 5:33:15 PM PDT by Doogle (((USAF.68-73..8th TFW Ubon Thailand..never store a threat you should have eliminated)))
[ Post Reply | Private Reply | To 22 | View Replies]

To: NonValueAdded

Exactly.


25 posted on 03/17/2012 5:46:21 PM PDT by U-238
[ Post Reply | Private Reply | To 23 | View Replies]

To: Krankor

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.


26 posted on 03/17/2012 6:01:49 PM PDT by FateAmenableToChange
[ Post Reply | Private Reply | To 17 | View Replies]

To: U-238

Try that on the NY Times.


27 posted on 03/17/2012 6:31:44 PM PDT by Hebrews 11:6 (Do you REALLY believe that (1) God IS, and (2) God IS GOOD?)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Hebrews 11:6

I do not think it would work on newsprint. But I am not completely sure about that.


28 posted on 03/17/2012 6:49:01 PM PDT by U-238
[ Post Reply | Private Reply | To 27 | View Replies]

To: U-238

How about a flamethrower?


29 posted on 03/17/2012 6:57:05 PM PDT by Hebrews 11:6 (Do you REALLY believe that (1) God IS, and (2) God IS GOOD?)
[ Post Reply | Private Reply | To 28 | View Replies]

To: Hebrews 11:6
Definitely a flamethrower
30 posted on 03/17/2012 6:59:07 PM PDT by U-238
[ Post Reply | Private Reply | To 29 | View Replies]

To: U-238
"Reusing rather than recycling paper would be good for the environment, they said."

Enviro-Nazis plotting again.  Who is paying for their "research"?  Duplex printing will not be enough for them? 

31 posted on 03/17/2012 7:06:50 PM PDT by OneHun
[ Post Reply | Private Reply | To 1 | View Replies]

To: OneHun
I can only tell you where the paper is published.It is published in Proceedings Of The Royal Society A, a 532
32 posted on 03/17/2012 7:13:15 PM PDT by U-238
[ Post Reply | Private Reply | To 31 | View Replies]

To: All

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

Author Affiliations

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

http://rspa.royalsocietypublishing.org/content/early/2012/03/09/rspa.2011.0601.abstract


33 posted on 03/17/2012 7:17:13 PM PDT by U-238
[ Post Reply | Private Reply | To 32 | View Replies]

To: Vince Ferrer

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.


34 posted on 03/17/2012 7:40:00 PM PDT by Neidermeyer
[ Post Reply | Private Reply | To 3 | View Replies]

To: FateAmenableToChange

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 ..


35 posted on 03/17/2012 7:44:04 PM PDT by Neidermeyer
[ Post Reply | Private Reply | To 26 | View Replies]

To: Red_Devil 232; Las Vegas Ron; butterdezillion; Red Steel; rxsid

“I had to present a certified, raised seal and signed BC to the Texas Public Safety Officers to get a drivers lic. last week! Went home pulled it out of a briefcase and was back with in an hour.”

Good thing you aren’t Obama!!!! You would not have been able to accomplish that!!! /heavy sarc Obama plays many shell games


36 posted on 03/17/2012 8:00:58 PM PDT by F15Eagle (1 John 5:4-5, 4:15, 5:13; John 3:17-18, 6:69, 11:25, 14:6, 20:31; Rom10:8-11; 1 Tim 2:5; Titus 3:4-5)
[ Post Reply | Private Reply | To 16 | View Replies]

To: Neidermeyer

But there is security devices in checks such as watermarks.


37 posted on 03/17/2012 8:02:49 PM PDT by U-238
[ Post Reply | Private Reply | To 34 | View Replies]

The man who designed those watermarks in checks is Frank Abagnale Jr. whose life was made into the movie “Catch Me If You Can”.


38 posted on 03/17/2012 8:06:21 PM PDT by U-238
[ Post Reply | Private Reply | To 34 | View Replies]

To: 1_Rain_Drop

Bet he tore that one up and flushed it down grandma’s toilet the week before the election (about 10 days I think).

Of course she passed away the week following. Just a coincidence I imagine. You know, like Breitbart.

Lotsa strange timings surrounding this guy. Very weird.


39 posted on 03/17/2012 8:08:54 PM PDT by F15Eagle (1 John 5:4-5, 4:15, 5:13; John 3:17-18, 6:69, 11:25, 14:6, 20:31; Rom10:8-11; 1 Tim 2:5; Titus 3:4-5)
[ Post Reply | Private Reply | To 20 | View Replies]

To: JoeFromSidney
"The thing to do with unwanted paper is bury it so deep the oxygen in the air can't get at it."

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!

40 posted on 03/17/2012 8:23:56 PM PDT by TXnMA ("Allah": Satan's current alias...)
[ Post Reply | Private Reply | To 15 | View Replies]

To: U-238
Lasers can 'unprint' documents

That's nothing. Washington, DC politicians have been "unprinting" documents for decades.

Fortunately, some of us still retain copies...


41 posted on 03/17/2012 8:33:55 PM PDT by EternalVigilance (Without virtue, happiness cannot be. -- Thomas Jefferson)
[ Post Reply | Private Reply | To 1 | View Replies]

To: U-238

When do we start?


42 posted on 03/17/2012 8:43:51 PM PDT by Hebrews 11:6 (Do you REALLY believe that (1) God IS, and (2) God IS GOOD?)
[ Post Reply | Private Reply | To 30 | View Replies]

To: U-238
My first patent dealt with laser ablation (of silicon). Specifically, it was a method of dealing with the ablated silicon to keep it from falling back as slag and contaminating the surface.

If this process were done in economically significant volume, dealing with the vaporized polymer binder would be an issue (at least in the building where the process was performed).

Simply performing the ablation in a suitably oxygen-enriched environment would dispose of the polymer (and carbon pigment) -- and provide a smidgen of that good old carbon dioxide that green plants need to thrive.

And, as I said previously, don't give me any "AGW" BS. The feedback has been empirically shown to be negative. (The warmists' computer models -- which all use positive feedback -- are junk...)

43 posted on 03/17/2012 9:01:04 PM PDT by TXnMA ("Allah": Satan's current alias...)
[ Post Reply | Private Reply | To 33 | View Replies]

To: U-238
Thank you.  Usually it is hard to find out who are financing this type of researches.  It can be legitimate or something like Climate Gate. 
44 posted on 03/17/2012 9:03:42 PM PDT by OneHun
[ Post Reply | Private Reply | To 32 | View Replies]

To: OneHun

You are welcome. It was necessary to lay everything out on the table for you to see.


45 posted on 03/17/2012 9:20:43 PM PDT by U-238
[ Post Reply | Private Reply | To 44 | View Replies]

To: Hegemony Cricket; Ernest_at_the_Beach; ShadowAce; Swordmaker

Thanks Hegemony Cricket. I remember a show, Cronkite did it, called “The 21st Century” — one segment showed a typewriter (whatever that is) which used a laser to erase mistakes, a capability which was used “on the go”, since we didn’t have such cushy computer equipment and the like back then.

The laser used to be dubbed, “the solution in search of a problem”. Imagine. :’)


46 posted on 03/17/2012 10:02:00 PM PDT by SunkenCiv (I come to bury Caesar, not to praise him)
[ Post Reply | Private Reply | To 7 | View Replies]

To: Cringing Negativism Network
Somehow I’m wondering if vaporizing polymers is ‘greener’ than just throwing the stuff in the trash?

You just need to buy carbon offsets from Al Gore each time you vaporize polymers and heat up the earth and the negative effect is erased.

47 posted on 03/17/2012 10:31:25 PM PDT by JimWayne
[ Post Reply | Private Reply | To 5 | View Replies]

To: U-238

But there is security devices in checks such as watermarks.
*************************************************
That is why I said “buy a cashiers check” ,,, otherwise you can just print them up on any laser printer at home..


48 posted on 03/18/2012 3:22:20 AM PDT by Neidermeyer
[ Post Reply | Private Reply | To 37 | View Replies]

To: Neidermeyer

How to tell if a cashier’s check is counterfeit

http://www.happynews.com/living/money/financial-frauds-tell.htm


49 posted on 03/18/2012 1:32:36 PM PDT by U-238
[ Post Reply | Private Reply | To 48 | View Replies]

To: Neidermeyer

Not nearly as cool as the vaporizing story he told me. Bummer.


50 posted on 03/18/2012 6:37:15 PM PDT by FateAmenableToChange
[ Post Reply | Private Reply | To 35 | View Replies]


Navigation: use the links below to view more comments.
first 1-5051-53 next last

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.

Free Republic
Browse · Search
Bloggers & Personal
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson