What kind of material is good for sunshade?
Buy sunshade umbrella should pay attention to whether there is a label that this umbrella is anti UV, is this umbrella can really prevent ultraviolet ray (the general umbrella is not UV resistant). Of course, the market also sells both rain and anti UV umbrella. Usually the label will be sewn on the umbrella in the inner parts of skeletons, or its price tag has marked effects of anti UV.
According to the fabric properties of the umbrella surface, the ultraviolet resistance is preliminarily judged. Generally speaking, cotton, silk, nylon, viscose and other anti ultraviolet properties of poor, and polyester better. Usually used colored umbrella fabric containing polyester fabric, Mcb etc.. In addition, anti UV performance to the best satin fabrics, followed by twill, plain weave, the darker the better.Sun umbrella can prevent ultraviolet radiation, fabric quality is not the most important, the main manufacturers are also what kind of fabric to do what kind of technical treatment. General cotton, linen texture of the fabric itself has a certain anti UV properties, but the degree is not strong enough. In the last two years, the sun umbrellas sold on the market were mostly coated with silver paste on the umbrella surface, which can reflect and stop some direct ultraviolet rays. But the quality of silver colloid has good and bad, good technical conditions of sun umbrella manufacturers to produce silver plastic is not easy to fall off, and some cheap sun umbrella for every one, only to the umbrella surface coated with a layer of silver, after several times of sunlight fell off color.
When choosing a sunshade, refer to the following points:In the selection of umbrella surface, fabric textiles obvious sparse umbrella, anti ultraviolet performance is generally poor, consumers carefully buy.Because of the shrinkage characteristics of fabrics, when buying shade, the umbrella surface should be large and should not be small.The color of the fabric is related to the UV protection. Under the same conditions, the deeper the fabric, the better the anti ultraviolet performance, in contrast, black, Navy, dark green, light blue, light pink, light yellow and other anti ultraviolet properties better.The purchase should be carefully inspected the protection grade sign. The State Quality Inspection Administration issued the "anti UV performance evaluation of textile products" provisions, only UPF (UV protection coefficient greater than 30), and UVA (UVA) transmittance of less than 5%, can be called UV products, protection grade standard for "UPF30+"; when the UPF is greater than 50, indicates that the product performance of UV protection excellent protection class identified as UPF50+". Consumers in the purchase, you should carefully check the protection level logo, and then according to the local sun conditions, choose their own umbrella.
When the umbrella surface is wet, the transmittance of ultraviolet light is increased due to the optical conduction of water, and the protective effect is reduced. Therefore, wet umbrella should not be used for UV protection.
