Independent research and development of ＂grinding a sword for ten years＂ is only for blind people to see pictures and texts.

　　People’s Daily Online, Beijing, March 12 (Reporter Ding Yixin) "The touch is good, very uniform, and there is no odor." This is Liu Lili, the Paralympic Integration Manager of the Biathlon Center of this Winter Paralympic Games, who has heard the most comments from foreign athletes on the Chinese and English versions of the venue introduction manual. "Many foreign friends are interested in this in the past two days. Nearly 20 handbooks have been kept in the original venue, because many people want to keep them as souvenirs, and there are only three left at present."

　　Origin: Kindness ignites the "spark" of Braille.

　　Different from ordinary Braille printed matter, this manual adopts the new green Braille printing technology independently developed by China Academy of Sciences, which has better touch, antibacterial and environmental protection. Song Yanlin is the main person in charge of this technology.

　　After entering the Chinese Academy of Sciences for 24 years, Song Yanlin did not study Braille printing at first. About ten years ago, he heard a little girl singing in the street and was immediately touched by the lyrics. "Later, I learned that the song was called" You are my eye "and it was about the blind." It was from then on that Song Yanlin wondered if he could do something for this group with his major.

　　Born in chemical research, he aimed at the direction of Braille printing. Traditional braille printing equipment has many disadvantages, such as dependence on imports, high printing cost and easy wear. If we can break through these problems and lower the threshold of braille printing, it will bring more convenience.

　　Breakthrough: Solving the Problems of Academia for Decades

　　With this goal in mind, Song Yanlin and his team began to study for nearly ten years. "In fact, we spend most of our time solving some basic scientific problems that have not been broken. For example, the Marangoni effect is also a difficult problem that the academic community has discussed for decades. " By solving these scientific problems, they accurately control the formation of various patterns of ink droplets, realize the fine patterned assembly of nano-functional materials "points, lines, surfaces and bodies", and break through the accuracy limit of traditional printing technology.

　　Song Yanlin and his team were boiling after learning that they could produce related products for the Beijing 2022 Paralympic Winter Games. "Of course! What we did was originally used in blind schools, and now it can be displayed on a larger world stage. Everyone is looking forward to it and is under pressure. " For this team, this is not only a job, but also a continuation of love and goodwill.

　　Now, the original small wish has not only come true, but also entered the stage of international competitions, and Song Yanlin is also very proud. "Serving the Winter Olympics, helping the disabled with science and technology, different Winter Olympics, different warmth." He wrote such a copy in a circle of friends.

　　Future: Let blind friends enjoy convenience in more scenes.

　　"Friends who haven’t been exposed to Braille don’t know that traditional Braille feels hard and has a pungent smell. It is easy to wear and tear after a long time, and its life is not long." Song Yanlin told reporters that in order to provide more targeted help, he would also try to blindfold himself to experience the feeling of blind people reading. "When you close your eyes, your sense of smell will be particularly sensitive and the smell will be more obvious." Chemistry is Song Yanlin’s old job. His team designed special materials to make the ink not only have no irritating smell, but also increase the fragrance.

　　However, the ingenuity of scientific researchers does not stop there. Even after they have achieved the precise formation of ink droplets and broken through many difficult problems in academic circles, they are not satisfied, but want to extend this technology to more application scenarios.

　　Traditional Braille is printed on special high-strength fiber paper by metal washing, which is not only expensive, but also limited by materials, so it is difficult for Braille to get more applications.

　　Regarding the process of braille printing, Song Yanlin gave an example of coffee stains: a drop of coffee will spread when the solid surface is dry, forming a point with thick edges and uneven middle. "This process is uncontrolled, but in our technology, by controlling the interaction between the surface of the substrate and the droplets, the whole drying behavior is controlled and accurate printing is realized. In this way, almost all kinds of solid surfaces you think of can be printed in Braille. "

　　In this way, Song Yanlin and his team are also drawing a bright future blueprint for Braille printing. "In the future, Braille printing will become a more universal technology. At present, many parties have contacted us and want to add Braille tips to the packaging of food and medicine to help blind friends better integrate into society. "