High efficiency UV LED UV curing system developed by Fudan University to realize LED power density first

With the original 1/5 energy consumption, a high half of the fiber production speed can be achieved - by the vice director of the Institute of electrical light sources of Fudan University, Professor Zhang Shanduan of the school of information science and engineering, and the optical fiber drawing tower of a high efficiency UV LED system developed by his team. This UV LED light curing system will be unveiled at the eighteenth China International Industrial Expo. Most of the light curing ink can be cured in only a few seconds after the irradiation of the system. The innovative technology of such high power density and low energy consumption will make the production and manufacture of the optical fiber industry leap forward. The most prominent advantage of the UV LED UV curing system that exceeds the energy consumption of 1/5 is the most prominent advantage of the ultraviolet light UV curing system, which is low energy consumption. Compared with the traditional microwave medium pressure mercury lamp, the high energy consumption is 6000 dova, the line light source composed of ultraviolet LED only needs 1200 watts, saving 80% energy. Microwave medium pressure mercury lamp is used as a curing device used in fiber drawing tower in the past. In the process of making fiber, when the fiber is pulled into thin wire, it is necessary to coat a protective coating of ink on its surface and solidify, popularly saying that the coating is made from liquid to solid. The production of printing, automobile, electronics, furniture and other industries will be less than this link. UV curing is the most common fast curing process, and the UV - band sensitive coating can be cured after illuminating the light source. However, the microwave medium pressure mercury lamp, a traditional light source, has many disadvantages, not only is the high energy consumption, but also a large amount of heat and low radiation efficiency. According to the spectrum, the UV light emitted from medium pressure mercury lamp has only about 10% of UV light for curing, 20% of light and 70% of heat. Its curing efficiency is difficult to meet the increasing production demand in the optical fiber industry, and it is contrary to the idea of promoting economic and environmental protection. Zhang Shanduan's team used UV LED to develop a more efficient UV curing system. In addition to reducing energy consumption, traditional equipment has a life span of only 6000 hours, and the system has extended its service life to 30000 hours. After more than one year's continuous operation, almost no light failure, and the photoelectric parameters remain out of the factory state. According to the spectrum, the UV LED is very concentrated on the 365 to 385 nanoscale bands for the curing of fiber ink, which is more favorable to curing than the medium pressure mercury lamp. Zhang Shanduan said: "the new UV LED light curing system requires only 1/5 of the traditional energy consumption, which can be twice as high as the traditional radiation, half of the drawing speed, and work longer." The first international LED power density is introduced in the world. This UV LED UV curing system can not only replace the traditional microwave medium pressure mercury lamp, but also achieve technical breakthrough and innovation in many respects compared with the existing products of the same kind. The system is composed of three parts: the optical fiber curing furnace, the driving power supply and the cooling system. The fiber curing furnace is the core of the technology, and the LED light source is the most important part of the whole system. Three years ago, the industrial fair, the Zhang Shanduan team developed a UV LED UV curing system for the first time, then the UV LED light source can achieve 200 watts per square centimeter power density, has reached the world's leading level. This year, the UV LED UV curing system for fiber drawing towers has raised the highest power density to 700 watts per square centimeter, stabilizing the world's first technical status. The most common UV LED chips in the industry can stand up to only 1 ampere per square millimeter current density, and the LED chip, specially designed by Zhang Shanduan, can increase the upper limit to 4.5 ampere per square millimeter, mainly due to its innovative packaging technology. Another highlight of the technological innovation is an efficient ultraviolet refraction and reflection system. The optical system includes carefully designed lenses and reflectors, which can converge ultraviolet light from the light source to the cylindrical axis, enhance the radial illumination of the axis, and reduce the optical loss, thus improving the speed of the wire drawing. The future of support production is expected to promote more industry changes. The system has declared 6 invention patents, and outstanding technical performance has also produced significant economic and social benefits. Under the aid of the system, maintaining the same system input power, the wire drawing speed of the fiber wire drawing tower can increase by nearly 50%, reaching an astonishing speed of 3000 meters per minute. Now, only two silk pagoda will be able to produce the original three silk pagoda, saving investment, increasing production and reducing energy consumption. The data show that several international optical fiber giants have added a total of 1 billion 840 million yuan in the last three years after the use of the system in a small scale, with a new profit of 300 million yuan, and a power saving rate of 4 million 430 thousand yuan and 4 thousand tons of carbon dioxide emissions when the electricity saving is 4 million 20 thousand kwh. Therefore, the UV LED UV curing system for the fiber drawing tower is a major breakthrough for the production and manufacture of the optical fiber industry, which will greatly promote the innovation of the light curing equipment. Zhang Shanduan is sure to realize the upgrading of the domestic enterprises' optical fiber curing furnace technology in three years. In the future, the technology is expected to be used in more fields related to light curing, such as printing, wood floor, home, floor and other industries. For paint, wood, printing and other types of light curing, the technology can also push the energy saving up to 90%.