According to the British Daily Telegraph May 21 (Beijing time), recently, engineers at Cambridge University in the United Kingdom have developed a new method that can use lasers to erase the printed and copied handwriting and images on paper. Clear the Print function printer or copier to reuse the printed paper. The related papers were published in the British "Royal Society Journal Series A". The technology uses a short-pulse laser heating to remove toner ink that has been printed on paper. The laser will evaporate the ink without damaging the paper. It can remove many kinds of prints and prints in only four billionths of a second. Ink. The researchers also found that although both UV and IR lasers can effectively remove ink, the best one is a visible green laser. This method does not cause any physical damage to the paper, nor does it cause the paper to discolor. The ink evaporated into gas can also be collected by a filtering device. "This process works for a variety of toners without damaging the underlying paper, so it's easy to reuse them in the office," said Julian Olwood, who led the study. And from an environmental point of view, this technology can not only greatly reduce the cutting of trees for papermaking, but also can be used as a cheaper recycling technology. According to their calculations, the current construction of a prototype "cleaning printer" is estimated at 19,000 pounds. With the improvement of technology and commercialization, the cost will be further reduced. When the cost is reduced to 16,000 pounds, it is cost-effective to use the equipment in most offices from the perspective of paper demand. They have now contacted several commercial companies that are interested in producing the first "clear printer". Researchers believe that the "clear print" technology is more environmentally friendly than using chemical methods to recycle waste paper, which not only reduces the demand for chemicals, but also reduces carbon dioxide emissions by 79%. (Reporter Chang Lijun)
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