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Taiwan university in disc recycling breakthrough

Archiv – Taiwan | Researchers at Taiwan’s Da-yeh University have broken new ground in the recycling of CD/DVD ROM discs.
An award-winning technique has been devised that cleans all coatings from the discs in a few minutes – and without damaging them.
Taiwan | Researchers at Taiwan’s Da-yeh University have broken new ground in the recycling of CD/DVD ROM discs.
An award-winning technique has been devised that cleans all coatings from the discs in a few minutes – and without damaging them. Involving the use of alcohol and nitric acid leaching and supersonic cleaning, this innovation won a gold medal at the 2009 Taipei International Invention Show and Technomart in late September.
The technique, which has earned patent rights from the Intellectual Property Office under the Ministry of Economic Affairs of Taiwan, was developed mainly by Yang Yu-hao – a Masters degree graduate from Da-yeh University’s Department of Environmental Engineering – under the guidance of the department’s head, Professor Lee Ching-hua.
According to Lee, the two sides of each DVD disc are separated and then soaked in alcohol for one minute before being moved to a supersonic washing machine to rid them of the memory dye and ink. Discs are then placed in a nitric acid bath and afterwards in another supersonic cleaner to remove the protective coating and metal reflective layers.
This process is followed by washing in water to leave clean, transparent polycarbonate discs.
CDs can be cleaned in the same way although the processing period is even shorter because these products do not feature two sides requiring separation, Professor Lee explains.

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