In summer or in plateau areas, many friends wear clothing with anti-UV fabrics when traveling. So how do these so-called anti-UV fabrics prevent or stop the harm of ultraviolet rays in the sun to the human body? Below I will briefly introduce the performance and common sense of some UV-resistant fabrics for your reference and discussion together.
We all know that sunlight includes visible light, ultraviolet (UV), infrared and other light bands, among which the light with a wavelength of 100-400 nanometers is ultraviolet (the ultraviolet spectrum is divided into three bands: UVA, UVB, and UVC, among which UVA and UVB It is very harmful to the human body. To put it simply, UVA tans you and causes a large amount of melanin to deposit in the epidermis. UVB can penetrate the epidermis and long-term exposure can cause genetic factor DNA damage and lead to skin cancer), which accounts for 6.1 of the sun’s rays. %. The harm of ultraviolet radiation to the human body has attracted more and more attention. Ultraviolet rays can cause sunburn, aging, and the production of melanin and spots on human skin. In more serious cases, it can also induce cancer in the human body. In terms of clothing fabrics, ultraviolet rays can accelerate the fading and brittleness of textiles. Now some European countries have legislated to require the use of anti-ultraviolet fabrics on uniformly made clothing for students. my country has also formulated its own corresponding anti-ultraviolet standards for textiles. It should be said As people’s health awareness continues to increase, textiles with UV protection functions have attracted more and more attention.
The principle of UV protection fabrics:
The principle of anti-UV fabric is to use the ultraviolet absorber mixed into the fabric to absorb high-energy ultraviolet rays and convert them into low-energy heat energy or electromagnetic waves with shorter wavelengths, thus eliminating the harm of ultraviolet rays to the human body and fabrics. The use of ultraviolet reflectors can increase the reflection and scattering of ultraviolet rays by fabrics and prevent them from penetrating the fabric. It has the properties of heatstroke prevention, heat insulation and cool touch.
It should be noted that national standards stipulate that fabrics with UPF5% cannot be called anti-UV fabric products.
The unit of ultraviolet sun protection is the UPF value. The method for calculating the UV protection function is; UPF = the small amount of exposure that produces erythema when the skin is not protected/the small amount of exposure that produces erythema when the skin is protected, that is, when you wear this dress, you Can withstand several times the sun exposure time.
Anti-UV clothing fabrics include cotton, linen, silk, wool, chemical fiber and other fabrics. Some anti-UV fabrics that have been processed by better processes have good absorption of ultraviolet rays in the 180-400nm band (especially UV-A and UV-B). Through conversion, reflection and scattering, the finished fabric is non-toxic, non-irritating to the skin, and the human body will not produce allergic reactions. At the same time, it does not affect the coloration and moisture absorption and breathability of the fabric. Good anti-UV fabrics have good absorption effects on ultraviolet rays in the 100-400cm band, especially UV-A and UV-B. After 50 washes, the ultraviolet transmittance is still less than 1%, and the ultraviolet blocking factor UPF can reach 50 +High level.
Differences in UV protection properties of different fabrics:
Among various clothing fabrics, thicker fabrics have better UV resistance than thin ones. Among them, polyester fiber has better UV resistance, which is related to the benzene ring in the molecular structure of polyester fiber that absorbs ultraviolet rays. The UV resistance of nylon, cotton, and silk is not satisfactory. Therefore, when choosing anti-UV clothing, you should try to choose thick fabrics containing polyester fibers. (The UV protection performance of some domestic polyester fiber fabrics has now reached a very high level).
The tighter the fabric, the stronger its light-blocking ability and the less UV rays it transmits. Woven fabrics have better UV protection than knitted fabrics. The darker the color of the clothing fabric, the smaller the UV transmittance and the better the UV protection performance.
Two types of anti-UV finishing processes for clothing fabrics:
1. Use ultraviolet absorbers to post-process the fabric to achieve ultraviolet protection.
2. Use ceramic micropowder to combine with fibers to increase the reflection and scattering of ultraviolet rays on the surface to prevent ultraviolet rays from penetrating the fabric and damaging human skin.
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