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    选购防紫外线伞三绝招

    发布时间:2015/8/17 16:25:49

    摘要:

      一把把小伞既可以为人们遮挡烈日,又组成街头一道美丽的风景,如何选择一把防紫外线的伞呢?

      在中国消费者协会指导会上,专家介绍,选择防紫外线伞主要看伞的面料。研究表明,伞面厚的布料比薄的抗紫外线性能好,在没有经过处理的纤维中,以涤纶纤维的抗紫外线性能最好,这与其分子结构中的苯环具有吸收紫外线的作用有关。化学纤维中绵纶(尼龙)、粘胶(人造棉、人造丝),以及天然纤维中棉、丝的抗紫外线性能都不太理想。选择抗紫外线伞要尽量选择厚一点且含涤纤维的面料。目前,市场上主要有提花色丁、银葱色丁、转印色丁、唛克布、碰击布和T/C布等。另外,织物越紧密,挡光能力越强,紫外线透过越少。在机织物中,一般平纹织物的孔隙率大于斜纹,斜纹又大于缎纹,所以平纹的抗紫外线性能较差,而缎纹织物最好。第三,织物的颜色越深,紫外线透过率越小,防紫外线性能越好。因此,在挑选防紫外线伞时,要考虑到伞面面料以及面料的紧密度、颜色和厚度,以求得最佳防紫外线效果。

      作为消费者不可能在伞面料方面十分内行,挑选时很难保证不会买到假冒伪劣产品。中消协消费指导部的人员介绍说,最近杭州天堂伞申请使用“3·15标志”被批准,因为天堂伞的系列产品经中国计量科学研究院检测,其UVA、UVB的防护系数UPF值均达到50+,防紫外线效果最好。一旦购买天堂伞出现问题,该集团承诺,凡3000元以下的小额消费争议,其必须服从中国消费者协会的调解意见,很大程度上规避了购买风险,使消费者的合法权益得到有力的保护。

      有关专家还提醒消费者认清防紫外线性能标识。目前,国内外的标准对纺织品的防紫外线性能一般都使用UPF 值,即紫外线防护系数值进行评定。UPF值是紫外线对未防护的皮肤的平均辐射量的比值,UPF值越大,表明防紫外线性能越好。即将出台的国家标准规定:只有当 UPF>30 时并且UVA的透过率小于5%时才能称为防紫外线产品,防护等级标识为 UPF30+;而当UPF>50时,则表明该产品的紫外线防护性能极佳,防护等级标识为 UP50+。

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