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UV (ultraviolet) parameter characteristics


UV (ultraviolet) parameter characteristics

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  UV can be linked by four characteristics: UV spectral distribution, irradiance, amount of radiation, and radiation density.

一: spectral distribution
    It describes the wavelength distribution of radiant energy as one of the wavelengths of the emission wavelength of the lamp or radiant energy reaching the surface. It is often expressed in a related standardized term, nm.
二: UV radiation intensity
    Radiation intensity is the radiant power reaching the surface area of ​​the surface. Radiation intensity, expressed in watts per millimeter or milliwatts. It varies with the output power of the lamp, the efficiency, the focus of the reflective system, and the distance to the surface. The high intensity, peak focus power reference placed directly under UV is "peak radiance". Radiation intensity includes all factors related to power supply power, efficiency, radiant output, reflectivity, focus tube size and geometry. Due to the absorption characteristics of the UV curable material, less light energy is reached below the surface layer than at the surface layer. The curing conditions in these areas may vary significantly. Materials with a thick optical thickness may reduce light efficiency, resulting in insufficient curing of the deep layers of the material. In inks or coatings, the higher radiant intensity of the surface provides a relatively higher amount of light energy. The depth of cure is more affected by the irradiance than the longer cure time (radiation). High irradiance allows for the use of less photoinitiator. The increase in photon density increases the collision of the photon-photoinitiator, thereby compensating for the decrease in photoinitiator concentration. This is effective for thicker coatings because the photoinitiator of the skin absorbs and blocks the photoinitiator molecules that reach the deep layer at the same wavelength.
三: UV radiation energy
    The radiant energy represents the total amount of photons reaching the surface area of ​​the substrate (and the radiant intensity is the rate of arrival). At any given source, the radiant energy is inversely proportional to the rate of cure and proportional to the time of cure. The radiant energy is the time accumulation of the radiant intensity, expressed in joules per square centimeter or millijoules (unfortunately, there is no information about the radiant intensity or spectral content converted to radiant energy measurement, it is simply the accumulation of the energy of the exposed surface. The significance of this is that it is the only feature that includes the speed parameter and the cure time parameter.
四: radiation density
    Infrared radiation is mainly infrared energy emitted by a UV light source. Infrared energy and UV energy are collected together and focused on the work surface. This is determined by the reflectivity of the IR and the efficiency of the reflector. The IR energy can be converted to a unit of radiant energy or radiation intensity. But usually, the surface temperature it produces is the important point to be noticed. The heat it produces may be harmful or beneficial. There are many techniques for solving the relationship between temperature and IR in combination with UV. Can be divided into reducing emissions, transmission and control of heat transfer. The reduction in emission is achieved by using a small diameter tube because the quartz tube wall emits almost all temperatures. The reduction in transmission can be achieved by using a color separation quartz material reflector (reflecting UV-filtered infrared light) behind the tube; or using a color-separated quartz material between the tube and the target (insulating infrared radiation) . The heat transfer reduces the temperature of the substrate and allows the use of cold air or heat sinks to control heat transfer after the IR has caused an increase in temperature. The absorption of IR energy is determined by the substrate itself—ink, coating or substrate. The speed of printing has a major impact on the IR energy absorbed by the surface of the print. The faster the speed, the less IR energy is absorbed.