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UV LED light features

UV lights are divided into the following four main features:
1 spectral distribution
It is described as the wavelength distribution of the radiation energy or the radiation energy reaching the surface layer as a function of the tube emission wavelength. It is commonly used in a standardized terminology to express, that is, nano (nm).
2 UV intensity
UV radiation intensity is the radiation power of the unit area of the surface of the surface. Radiation intensity, expressed in watts per square centimeter or in. It varies with the output power, efficiency, the focus of the system and the distance to the surface of the lamp tube. The high intensity and the peak focusing power are directly placed under the UV lamp ". The radiation intensity includes all the factors related to power, efficiency, radiation output, reflectivity, and the size and geometry of the focus tube. Due to the absorption properties of UV curable materials, the light energy below the surface layer is less than that of the surface layer. Curing conditions in these areas may be significantly different. The optical thickness of the material may reduce the light efficiency, which leads to the deep layer of the material curing is not sufficient. In the ink or coating, the higher the radiation intensity of the surface will provide a relatively high light energy. The depth of cure is more affected by the radiation than the longer cure time (the amount of radiation). High radiation permits the use of less light initiator. The increase of the photon density increases the collision of the photon light initiator, which compensates the decrease of the concentration of the photo initiator. This will be effective for a thicker coating, because the surface layer of the photo initiator absorbs and prevents the same wavelength reaching the deep layer of the photo initiator molecule.
3 UV energy
UV radiation energy reaches the surface of the substrate surface unit area of the total amount of photons (and radiation intensity is the rate of arrival). Under any given light source, the radiation energy is inversely proportional to the rate of cure and is proportional to the time of the cure. Radiation energy is the time accumulation of radiation intensity and joule per square centimeter or MJ said, unfortunately, there are no related radiation intensity or spectral content for information in radiation energy measurement, it is only by exposure to the accumulation of surface energy. Its significance lies in that it is unique to include the characteristics of the parameters of the speed and curing time, and now there are a lot of professional stability of the UV energy meter to measure.
4 infrared radiation density
Infrared radiation is mainly emitted by the UV light source infrared energy. Infrared energy and UV energy are gathered together and focused on the working surface. This is determined by the reflectivity of IR and the efficiency of the reflector. The IR energy can be converted to units of radiation energy or radiation intensity. But usually, the surface temperature that it produces is the important point of attention. The heat produced by it may be harmful or beneficial. Combined with UV lamp to solve the relationship between temperature and IR technology has many. Can be divided into reduced emission, transmission and control of heat transfer. The emission reduction is achieved by using a small diameter tube, because the quartz tube wall emits almost all of the temperature. Transmission can be reduced by behind the lamp using color quartz material reflector (reflectance UV IR filter) to achieve; or between the tube and the target using separation of quartz material heat mirror (cut off from the infrared radiation of ultraviolet). Heat moves to reduce the temperature of the substrate, which can be used to control the movement of heat by cooling the air flow or heat sink after the temperature rise in the IR. The absorption of IR energy is determined by the printing material ink, coating or substrate. Printing speed has a significant impact on the absorption of IR energy on the surface of the printed matter. The faster the speed, the less absorbed the IR energy.
The above UV lamp 4 characteristics of the hope that we can better understand the UV lamp, the reasonable use of UV lights.


Hits:  UpdateTime:2016-01-16 11:39:40  【Printing】  【Close


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