Several factors affecting UV light curing
时间:2016-04-18 09:15来源:sankun点击: 次
Several factors affecting UV light curing
Influence on the performance of the curing the UV lamp, can completely accurate associated with four features: UV spectral distribution, radiation, radiation and infrared radiation.
1. The spectral distribution
Described as a lamp radiation emission wavelength function, one of the phase or reach the surface of the wavelength of the radiation energy distribution. Standardization of the commonly used a related terms to express. In order to show the distribution of UV energy, can bring into lOnm spectral energy spectrum to form a distribution table. Thus allowing the comparison between different UV lamp and easier to energy and power spectrum calculation.
Ultraviolet wavelengths of uv curing effective wavelength is 200 nm - 400 nm
General on-line detection using multiple spectral bands ray detector to radiation spectral radiant exitance and characterization. Based on the relatively narrow (20 hm - 60 nm) band of radiation energy of sampling for useful to the spectral distribution of relative information. By _ different vendors ray detector structure is different, each other to do more is possible, but it's very difficult. There is no such a standard to make comparison between model, manufacturer.
Uv lamp metal halogen lamps and mercury lamp spectral distribution data:
High pressure mercury lamp is for 365 - nm wavelength, near 254 nm, 303 nm, 303 nm range, high efficiency is mainly used in UV wavelength UV light oil, ink curing; Metal halide lamp is mainly in the range of 200 nm - 245 nm wavelength ultraviolet, compared with high-pressure mercury lamp, long wavelength ultraviolet more release, is mainly used in the UV curing ink.
2. The degree of UV radiation
Radiation is reach the surface of the radiation power per unit area. Radiation, in watts per square centimeter or hao tile. The lamp output power, efficiency, focus and the distance to the surface of reflection system varies (it is tubes and geometry feature, so it has nothing to do with the speed). Directly under the UV lamp focusing power reference for the high strength, peak peak radiation. Radiation includes all the relevant power supply power output, efficiency, radiation, reflectivity, focusing the light bulb size and geometric shape factors.
Due to the absorption characteristics of UV can be solidified materials to the surface under the light energy is much less than the surface. In these regions may be significantly different curing conditions. Optical thickness of thick material (high absorbent, the physical structure or both have thick) may reduce light efficiency, which can lead to inadequate curing deep materials. In the ink or coating the surface of the high degree of radiation will provide relatively high light energy. Curing depth is more affected by radiation, not caused by a longer exposure time (radiation). The effects of radiation for high absorbent (high opacity) thin film is more important.
High radiation degree allows you to use less of the light trigger agent. Photon density increase in the number of increase the photon light trigger agent of collision, so as to compensate the light trigger reducing agent concentration. For the thicker coating will work, because the surface of the light trigger agent to absorb and hindered the same wavelength of the light trigger agent molecules reach deep.
3. UV radiation
Reach the surface of radiation energy per unit area. Amount of photon radiation said reaches the surface (rate) and the radiation intensity is arrived. At any given light source, the radiation is inversely proportional to the speed and is proportional to the number of exposure. Radiation is the radiation time accumulated, expressed as a joule per square centimeter (not related to radiation or spectral content in for with radiation measurement information, its just been exposed surface energy accumulation). Its significance lies in its is the only include the characteristics of the speed parameters and exposure time.
4. Infrared radiation density
Infrared radiation is mainly by the UV light source of the infrared energy emitted quartz bubble. Infrared energy with the UV energy is collected and focused on the work surface. This is determined by IR reflectance and the efficiency of the reflector. LR energy can be converted to radiation or radiometric units. But usually, generated by its surface temperature is of important place, the heat generated by the line may be hazardous to may.
In combination with UV light to solve the relationship between temperature and the IR technology has a lot of, can be divided into reducing emission, transmission and control heat movement. Emission reduction through the use of small diameter of the bulb, because it was hot quartz surface area to launch a few all IR. Pass reduction can be used by behind the lamp color separation of reflector, or between the tubes and the target using color window. Heat mobile reduces the temperature of the target, but it is only after IR has caused the temperature rise, can use cold air or cooling device to control the movement of the heat. The IR absorption of energy by the material itself decided to ink, coating or tomb. Speed on the incidence of IR energy and working surface absorption of energy caused by temperature has a significant impact. The faster the process, the less m energy is absorbed and cause temperature rise. Can by improving the efficiency to speed up the process of production.
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UV light(45)
