The role of UV aging test chamber in printing industry

The UV aging test chamber uses a light source similar to the white light lamp used in daily lighting, but it can produce ultraviolet light instead of visible light or infrared light. This requires placing the test object under short-wavelength ultraviolet light for testing. Because short-wavelength ultraviolet light is the longest-lasting and most damaging part of the entire solar spectrum. So this is part of the test*. The UV test device can also simulate fog using a condensation device. This results in a more realistic simulated environment, as outdoor studies have shown that condensation produces more humidity than rain. Additionally, some UV testing devices are also equipped with water spray devices to simulate thermal shock. This climate is quite damaging for certain materials.
The radiusUltraviolet light is most likely to cause discoloration. This is why the initial test using only high intensity ultraviolet rays proved that not only high intensity ultraviolet rays are deadly, but also low intensity ultraviolet rays. Violet rays are just as destructive when exposed to long-term exposure. Although accelerated testing can provide a lot of useful data, this is not the case. Some facts need to be tested over a long period of time.
Compared to the first two test devices, the UV test device is easier to use and cheaper. Its main disadvantage is that the UV bulb cannot produce any visible light, so it cannot test the material\'s ability to resist visible light and infrared rays. This performance is an important criterion for evaluating the ability of the material to resist fading.
In the printing industry, hundreds of millions of losses are caused each year by indoor light and various external factors, including fading and discoloration of various inks and breakage, peeling, delamination and oxidation of printing materials. Bright indoor light, sunlight through glass windows and direct sunlight are the main causes of these phenomena. Different wavelengths of light have different destructive effects on materials. In general, UV rays and long-wavelength visible light are the most damaging because they tend to cause ink fading and discoloration. Short-wavelength ultraviolet radiation can cause degradation of some very stable materials, such as paper media.
Tests for resistance to light and corrosion of materials are generally ecarried out during the product development and quality control stages. The benefit of testing the product is that it can better meet customer needs, for example those who require the product to last at least a year outdoors.
In recent years, the stability of printing materials has improved, but at the same time it has brought another problem, that is, it is difficult to find good red and yellow colors in organic pigments , especially yellow. , and achieve stability. To ensure color, it is usually necessary to test dozens of organic pigments to find one that meets the requirements.
The article is taken from: Standard Group (Hong Kong) Co., Ltd.

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