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UV curing is a well-recognized environmentally-friendly and energy-saving curing technology. It is a chemical process that uses ultraviolet (UV) irradiation of an organic coating to produce a reaction such as radiation polymerization, radiation crosslinking, and radiation bonding, and finally becomes a solid state. The reaction is fast, does not require an additional source of heat, the reactants are free or contain only traces of organic solvents, and substantially no volatile organic compound (VOC) emissions are produced during the reaction. The cured organic coating has excellent properties, corrosion resistance, wear resistance, high strength and impact resistance. Therefore, photocuring technology is widely used in industries such as photocurable coatings, photocurable inks, photocurable adhesives, photoresists, laser three-dimensional imaging, and three-dimensional modeling.
Light-emitting diodes (LEDs) quickly enter various fields of visible light illumination and ultraviolet radiation applications due to their high efficiency, small size, long life and high reliability. With the increase of radiation efficiency and price of UV LED chips, UV LED light sources have opened up the application field of UVA band above 365 nm, and are gradually replacing traditional ultraviolet gas discharge sources such as mercury lamps.
In order to meet the demand for UV light sources with power above kW in industrial applications, we have developed an LED package structure with high efficiency and heat dissipation. The package structure uses aluminum nitride plate as the thermal conductive insulation plate, and the electrode is made of copper plate, and the ultraviolet LED package module with power density of 50~500 W cm-2 is realized, which lays a technical foundation for the high-power ultraviolet LED light curing system.
The measured results of the module samples shown in the figure show that the thermal performance of the package structure is very good. Under the water cooling condition of 30 °C, the junction temperature of the module is lower than 80 °C when the power density is 250 W cm-2. The radiation efficiency is as high as 20% or more. Based on the module's UV LED source, the total power of the photocuring system has been more than 30 kW, which is fully capable of meeting the requirements of industrial UV curing.
This high-power UV LED light curing system offers a number of performance advantages:
The package power density is high. The highest package power density of our UV LED sources is 500 W cm-2, which is the world's leading 500 W cm-2. It has surpassed most gas discharge sources such as mercury lamps to meet the power requirements of UV light sources in all light curing applications.
Good thermal characteristics. The UV LED light source package has excellent thermal conductivity and heat dissipation characteristics, and the UV LED chip is always maintained at a low junction temperature state, ensuring good working stability and long life of the light source.
The system is highly efficient. The spectrum of the UV LED is concentrated near the center wavelength, all available; single-sided light output, no reflector light loss, so the ultraviolet LED light curing system can achieve radiation efficiency of more than 20%.
Can be switched on and off. It is ready to use and can be restarted instantaneously to further save energy and extend the life of the system.
The light-emitting surface has no thermal effect. The surface of the ultraviolet LED has no heat radiation, and the heat of the chip is discharged through the heat dissipation structure of the back, thereby avoiding various safety hazards caused by the high temperature surface of the mercury lamp. In addition, since the ultraviolet LED does not cause an infrared heating effect on the reactants, a heat sensitive material can be used in the reaction process, which expands the application range of the ultraviolet curing technology.
No shortwave UV damage. The UV LED chip used in the photocuring system has a center wavelength of 365 nm or more in the UVA region, and is completely free of short-wave ultraviolet rays that cause rapid damage to the skin.
In summary, the high-power UV LED light curing system is extremely competitive, and gradually replaces the mercury lamp for UV curing of various coatings, resins, inks and adhesives. It is the surface of wood floors, wood and various materials. Processing, display and other electronic equipment production, printing industry, packaging industry, etc. bring technological upgrading, with great market prospects.
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