When light hits the surface of a textile, some of it is reflected, some is absorbed, and the rest passes through the textile. Textile is made of different fibers and has complicated surface structure, which can absorb and diffuse the ultraviolet light, so as to decrease the transmittance of ultraviolet rays. And due to the difference of single surface morphology, fabric structure and color shade, the scattering and reflection will be different. Therefore, there are some factors influencing the anti-ultraviolet property of textiles.
1.The types of fiber
The absorption and diffuse reflection of ultraviolet rays of different fibers is quite different, which is related to the chemical composition, molecular structure, fiber surface morphology and the cross-section shape of fiber. The UV absorption capacity of synthetic fibers is stronger than that of natural fibers. Among, polyester is the strongest.
2.Fabric structure
The thickness, tightness (covering or porosity) and raw yarn structure, the number of fibers in the section, twist and hairiness, etc., all will influence the UV protection performance of textiles. The thicker fabric is tighter and has smaller pores, so the penetration of ultraviolet light is lower. In terms of fabric structure, woven fabric is better than knitted fabric. The covering coefficient of loose fabric is very low.
3.Dyes
The selective absorption of visible light radiation of dye will change the color of fabric. Generally speaking, for the same fiber of textiles dyed by the same dye, darker color one will absorb more ultraviolet light and has better shielding performance of ultraviolet light. For example, dark color cotton fabric has better UV protection than that of light color cotton fabric.
4.Finishing
By special finishing process, the anti- ultraviolet property of fabric will be improved.
5.Humidity
If fabric has higher moisture percentage, its anti-ultraviolet performance will be worse. It is because the fabric scatters less light when it contains water.
Post time: Jun-01-2024