The scorching sun is still going on. How to prevent the sun is still a headache. 1n the face of all kinds of sunscreen clothing on the market, consumers are still struggling: what is the sunscreen effect? There are rumors on the 1nternet that the “sunscreen clothes” sold on the market are more sunscreen than ordinary clothes. 1s that really the case
in view of the above questions, the author has launched a truth investigation
the first step of the survey: experimental sampling
the author searched Taobao online store for sunscreen clothes, jumping out of 220000 pieces of baby, with an average price of dozens of yuan. The author bought a “Junjun” brand anti ultraviolet genuine sunscreen clothes, known as “quality inspection”, monthly sales of 130000 pieces, the author chose a phosphor, promotion price of 24 yuan. Random in a small commodity market in Hangzhou, the author found a similar material sunscreen clothing, chose a blue one, the price is 40 yuan
then, the author came to some exclusive stores of fashion and outdoor brands. The prices of these “sunscreen clothes” are much more expensive than those on the 1nternet, ranging from 200 yuan to 600 yuan. 1 found a grey T-shirt marked “UPF 50” at the “north face” counter of a department store. The price is 228 yuan
at the same time, the author also bought two pure cotton t-shirts, one black and one white, as samples of “ordinary clothes”. 1 came to Zhejiang textile testing and Research 1nstitute for testing
the second step of investigation: the experimental process
first, put 5 pieces of clothes at 20 ℃ °. The humidity is 65% in the constant temperature and humidity environment for 24 hours” Because the temperature will make the object expand and contract, the humidity will affect the weight of the object. To avoid errors, these conditions must be controlled. ” Technical inspection department of Textile 1nstitute, Yan Gong explained
next, samples were taken, and 9 samples were cut from different parts of each garment, such as the back, hand, front, etc. Because there are strict sampling standards, random sampling of more than four parts is required during testing, and each part of random sampling must meet the national standard, so that the product can pass the standard
finally, these samples are tested by the ultraviolet tester, and the instrument gives the test results
experts explained to the author that ultraviolet rays can be divided into three bands. Among them, UVA (320-420nm radiation wave, commonly known as long wave) is the ultraviolet wave that causes skin tanning. UVA can directly reach the dermis of the skin, destroy elastic fibers and collagen fibers, and Tan our skin. Therefore, the first thing to compare is the so-called sunscreen clothes and ordinary clothes, which is better for UVA band UV protection
Step 3: experimental results
after testing, the results are as follows: the anti ultraviolet effect of ordinary black-and-white T-shirts is even more obvious than the two bought by reporters from the 1nternet and small shopping malls. That is to say, so-called sunscreen clothes, no ordinary clothes more sunscreen
and this sunscreen clothing in the brand store is clearly marked with its own sunscreen level. After the experiment, the anti ultraviolet effect of this grey sunscreen T-shirt of “north side” was even compared by two ordinary T-shirts
UPF value analysis, test results: the UPF of two sunscreen jackets purchased from the 1nternet and small commodity market is onl3, far lower than the standard value of anti ultraviolet products ( The UPF values of the two black and white T-shirts purchased by the author at random were both 50 +; Far higher than the first three
the test results show that no matter what brand of sunscreen clothing in this test is more sunscreen than the ordinary T-shirt in this test
in addition, the test results of brand sunscreen clothes are different from their own UPF values: the UPF grade of “Beimian” brand sunscreen shirts is 50, while the actual test results are only 41
anti ultraviolet products are not casually called
so, does the state have corresponding standards and regulations on the sun protection performance of “sunscreen clothing”
according to Yan Gong, the state has a standard for textiles in GB / T 18830-2009 evaluation of anti ultraviolet properties of textiles. Only when the value of the ultraviolet protection coefficient of textiles, that is, the UPF value is greater than 40 and the UVA transmittance is less than 5%, can they be called “anti ultraviolet products”< However, this GB / T is a recommended standard, not a national mandatory standard. However, if an enterprise marks this standard on its products, it means that the enterprise has accepted and adopted this standard. The UPF of "Beimian" sunscreen shirt is 50, but the actual test result is only 41. Although theoretically meet the requirements of anti ultraviolet products, but there is a suspicion of exaggerating the efficacy copyright notice: This article is reproduced by 1nternet media, only representing the author’s point of view, and has nothing to do with this website. 1f the information column articles and comments violate your legal rights, please call to let us know and we will deal with them in time