The laboratory light source exposure test can simulate light, oxygen, heat and rainfall in the visible environment of the atmosphere in one test box at the same time. Xenon lamp on the weather resistance test box. Among these simulation factors, the light source is the most important. Studies have shown that the wavelengths that cause the breakage of polymer materials in sunlight are mainly concentrated in ultraviolet light and part of visible light. At present, the artificial light sources used are trying to make the energy spectrum distribution curve in this wavelength range close to the solar spectrum, and the simulation and acceleration magnification are the main basis for selecting artificial light sources. After a relatively long period of development, various light sources such as enclosed carbon arc lamps, sunlight-type carbon arc lamps, fluorescent ultraviolet lamps, xenon arc lamps, and high-pressure mercury lamps are available for laboratory light sources. The technical committees related to polymer materials in the International Organization for Standardization (ISO) mainly recommend the use of three types of light sources: sunlight carbon arc lamps, xenon arc lamps, and fluorescent ultraviolet lamps. 1. Sunlight carbon arc lamp Sunlight-type carbon arc lamps are rarely used in China at present, but it is a widely used light source in Japan. Most JIS standards use sunlight-type carbon arc lamps. Many auto companies with joint ventures with Japan still recommend the use of this light source. The spectral energy distribution of sunlight-type carbon arc lamps is also close to that of sunlight, but the ultraviolet concentration is strengthened at 370nm-390nm, the simulation is not as good as xenon lamps, and the acceleration rate is between xenon and ultraviolet lamps. 2. Xenon arc lamp At present, it is considered that the spectral energy distribution of the xenon arc lamp in the known artificial light source is most similar to the ultraviolet and visible light parts in sunlight. By choosing a suitable filter, most of the short-wave radiation present in the sunlight reaching the ground can be filtered out. Xenon lamps have a strong radiation peak in the near infrared region of 1000nm ~ 1200nm, which will generate a lot of heat. Therefore, a suitable cooling device must be selected to take away this part of the energy. At present, there are two cooling methods for xenon lamp weather resistance test chambers on the market: water-cooled and air-cooled. In general, the cooling effect of the water-cooled xenon lamp test chamber is better than that of the air-cooled type, and the structure is more complicated and the price is more expensive. Since the energy of the ultraviolet part of the xenon lamp increases less than the other two light sources, it is the lowest in terms of acceleration magnification. 3. Fluorescent UV lamp Theoretically, the short wave energy of 300nm ~ 400nm is the main factor causing aging. If you increase this part of energy, you can achieve the effect of rapid testing. The spectral distribution of fluorescent ultraviolet lamps is mainly concentrated in the ultraviolet part, therefore, a higher acceleration rate can be achieved. However, fluorescent UV lamps not only increase the ultraviolet energy in natural sunlight, but also have radiant energy not found in natural sunlight when measured on the surface of the earth, and this part of the energy will cause unnatural destruction. In addition, the fluorescent light source has no energy higher than 375 nm except for the very narrow mercury spectral line, so that materials that are sensitive to longer-wavelength UV energy may not change like exposure to natural sunlight. Because of these inherent defects, unreliable results can be obtained. Therefore, the simulation of fluorescent ultraviolet lamps is poor. However, due to its high acceleration rate, the rapid selection of specific materials can be achieved by selecting the appropriate lamp. The UV aging test box currently on the market is this part of the light source used to perform aging experiments on some materials. ZENGHUI PAPER PACKAGE is a good Apparel Packaging manufacturers and
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The most suitable light source for ultraviolet aging test box for aging