Is it true that a sunshade can protect against sun? In the hot summer, the sunshade has become the first glare of many people for sun protection. However, some consumers have found that the sunscreen effect of this umbrella is far from the imagination. Umbrellas, really sunscreen? Professionals said that all umbrellas have the effect of shading. The main purpose of playing umbrellas is not to shade, but to block ultraviolet rays in the sun. If the parasol does not block ultraviolet rays, it may indeed cause allergies. The long-term exposure of the skin to sunlight causes ultraviolet radiation to the skin to cause a series of chemical reactions in the skin dermis. Ultraviolet rays can directly act on blood vessels and reflect edema. Then the reporter came to a merchant in a wholesale city to introduce that the main difference between a parasol and an ordinary umbrella is that the parasol fabric has a protective coating, and the coating material is pearl glue. The colors are mostly black, silver and yellow. The key to the effectiveness of blocking UV is the protective coating.
The UPF of the product stands for the value of the UV protection coefficient. According to the provisions of "Assessment of the UV Protection Performance of Textiles", when the UPF value is greater than 30, it can be called "UV protection product". When the UPF is greater than 50, it means that the UV protection performance is extremely high. good. According to industry sources, in order to reduce costs, some umbrellas only apply a layer of inferior reflective coating on the ordinary umbrella surface, which naturally cannot achieve the effect of preventing ultraviolet rays, and the cheap ultra-light shades sold on the market belong to this Products.
Reporter test: Cheap sunscreens are difficult to block ultraviolet sunshade prices vary widely, does the sunscreen effect also vary widely? The reporter then purchased several popular sunscreen umbrellas and conducted experiments. The reporter first found the purple light. Although ultraviolet light is invisible, the light emitted by the purple light has a higher proportion of ultraviolet light. At the same time, UV has a characteristic that it can make fluorescent substances react. Therefore, the purple light hits the banknote, and the fluorescent substance on the banknote can be revealed by ultraviolet radiation. The reporter used this principle to illuminate the umbrella with a purple light, and placed a banknote on the other side of the umbrella, judging whether the umbrella's blocking effect on ultraviolet rays was based on whether the fluorescent substance appeared on the banknote. It can be seen from the test that the UV protection umbrella with low price is basically the same as the UV protection effect of ordinary umbrellas. The reporter saw that the low-quality sunshade has the same blocking effect on ultraviolet rays as ordinary umbrellas, and the ultraviolet protection factor value is greater than 30 can block most of the penetration of ultraviolet rays. We also found that the silver film on the back of this cheap ultraviolet umbrella, but this layer of silver film will fall off with a pinch. Relevant tests show that because the umbrella surface of the sunscreen umbrella is coated, the color of the umbrella has little effect on the protective effect. Consumers should carefully read the protection level signs before purchasing. According to industry insiders, dry in time after rain, because the rain is acidic, which will corrode the sunscreen coating and affect the sunscreen effect.
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