1.1本标准描述了用于保护人类免受UVA和UVB辐射的纺织品的标签要求。 1.2本标准不适用于美国食品和药物管理局的上市前通知文件编制指南草案中规定标签的医疗器械防晒织物和服装的标签。 1.3标签要求是对《护理标签规则》和《纤维含量（成分）标签法》（1939年《羊毛产品标签法》和《纺织纤维产品识别法》）要求的补充。 1.4本文件包含紫外线防护纺织品标签中使用的术语。 1.5本指南中建议的标签将基于通过仪器方法收集的紫外线防护数据。 ====意义和用途====== 本标签指南为紫外线防护纺织品提供了统一的标签系统，告知消费者紫外线的含量- 提供保护。 根据本标准标记的紫外线防护纺织品将允许消费者比较各种纺织品提供的防护量，并购买最符合其防晒需求的产品。 紫外线标签是对服装其他所需标签的补充，包括永久护理标签和纤维含量（成分）标签。 鼓励制造商向消费者提供信息，帮助他们选择能够提供所需紫外线防护量的产品。 根据本标准指南标记的紫外线防护纺织品将标记UPF值。AATCC试验方法183必须用于确定未制备样品的平均UPF值，以及使用惯例制备的样品的平均UPF值 D6544 （为测试样本而制备），以及从贴有标签的衣服上取下的样本， “ 穿戴前清洗一次， ” 这些样本是在衣服根据标签说明洗涤一次后采集的。 在本文件中，后一种样品被称为一次性洗涤样品。将按照本文件中提供的说明计算各种类型样本的标签UPF。通常，放置在产品标签上的值将是为准备好的测试样本计算的标签UPF或为未准备好的样本计算的标签UPF，以较低的值为准。对于需要贴标签的产品， “ 穿戴前清洗一次， ” 或类似措辞，放置在产品标签上的UPF值将是为测试样本制备的UPF或洗涤一次的样本计算的UPF，以较低的值为准。 4.5.1 讨论 —放置在服装标签上的UPF值必须是消费者在两年内使用期间预期的最低保护值。通常，该UPF值将是为测试样本制备的UPF值，因为它们已洗涤40次并暴露于紫外线- 辐射模拟消费者使用期间预期降低UPF的条件。然而，对于某些织物，尤其是针织物，织物制造商必须将织物拉幅（拉伸）至服装制造商的标准宽度。该工艺显著降低了织物的UPF，因为对UPF有重大影响的光学孔隙率增加，并且不代表提供给消费者的最低UPF，因为在第一次洗涤后，收缩可以通过减少织物的光学孔隙率来恢复失去的保护。在这些情况下，与准备用于测试的值进行比较的值在逻辑上是一次洗涤样本的值。 紫外线防护标签旨在用于纺织产品，其设计或造型为覆盖的皮肤提供有目的的保护。 如果任何和所有织物或服装或两者都有本指南确定的紫外线防护要求，则应在这些产品上使用紫外线防护标签。

1.1 This standard describes labeling requirements for textile products intended for the protection of humans from UVA and UVB radiation. 1.2 This standard is not intended to be used for the labeling of medical-device sun protective fabrics and clothing whose labeling is specified in the U.S. Food and Drug Administration's Draft Guidance for the Preparation of a Premarket Notification document. 1.3 The label requirements are in addition to those required by the Care Labeling Rule and fiber content (composition) labeling acts (Wool Products Labeling Act of 1939, and The Textile Fiber Products Identification Act). 1.4 This document contains terminology to be used in the labeling of UV-protective textiles. 1.5 Labeling recommended in this guide will be based on UV protection data collected by instrumental methods. ====== Significance And Use ====== This guide to labeling provides a uniform system of labeling on UV-protective textiles that informs consumers about the amount of UV-protection provided. UV-protective textiles labeled according to this standard will permit consumers to compare the amount of protection provided by various textiles and purchase the product that best meets their sun protection needs. UV-labeling is in addition to other required labeling of garments including Permanent Care Labels and fiber content (composition) labels. Manufacturers are encouraged to provide information to consumers that aids in selecting products that provide the amount of UV-protection desired. UV-protective textiles labeled according to this standard guide will be labeled with a UPF value. AATCC Test Method 183 must be used to determine the mean UPF values of unprepared specimens, of specimens prepared using Practice D6544 (prepared-for-testing specimens), and of specimens taken from garments labeled, “ Wash once before wearing, ” these specimens being taken after the garment is laundered once according to label directions. The latter specimens are referred to as laundered-once specimens in this document. A label UPF will be calculated for the various types of specimens following directions provided in this document. Usually, the value to be placed on the product label will be the label UPF calculated for the prepared-for-testing specimens or the label UPF calculated for the unprepared specimens, whichever is the lower value. In the case of products to be labeled, “ Wash once before wearing, ” or similar wording, the UPF value to be placed on the product label will be either the UPF calculated for the prepared-for-testing specimens or the laundered-once specimens, whichever value is the lower one. 4.5.1 Discussion —The UPF value to be placed on a garment label needs to be the lowest protection value expected during consumer use over a two-year period. Usually, this UPF value will be that obtained for the prepared-for-testing specimens because they have been laundered 40 times and exposed to UV-radiation to simulate conditions expected to lower the UPF during consumer use. However, for certain fabrics, knits in particular, the fabric manufacturer must tenter (stretch) the fabric to standard width for the garment manufacturer. This process decreases the UPF of the fabric dramatically because the optical porosity, which has a significant influence on UPF, is increased and does not represent the lowest UPF provided to the consumer because after the first laundering shrinkage may restore the lost protection by reducing the optical porosity of the fabric. In these cases, the value to compare to the prepared-for-testing value is logically that of laundered once specimens. UV-protective labeling is intended to be used on textile products whose design or styling provides purposeful protection to covered skin. UV protective labeling should be used on any, and all, fabrics or garments, or both, if those products make a UV protective claim as determined by this Guide.