标准编号:	GB/T 42999-2023
中文名称:	家用纺织品 织物遮光性的测定 照度计法
英文名称:	Home textiles—Determination of the light blocking effect of fabric—Illuminometer method
中标分类:	W55    纺织制品综合
行业分类:	GB    国家标准
ICS分类:	59.080.30 59.080.30    纺织物 59.080.30
发布机构:	国家市场监督管理总局 国家标准化管理委员会
发布日期:	2023-09-07
实施日期:	2024-4-1
标准状态:	to be valid
翻译语言:	英文
文件格式:	PDF
中文字符数:	11000 字
翻译价格(元):	770.0
交付时间:	付款后 1~3 个工作日

Foreword This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights. This document was proposed by the China National Textile and Apparel Council. This document is under the jurisdiction of the National Technical Committee on Textiles of Standardization Administration of China (SAC/TC 302). Home textiles - Determination of the light blocking effect of fabric - Illuminometer method 1 Scope This document describes the test method for the determination of the light blocking effect of fabric by an illuminometer. This document applies to various textiles and related products. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB 6529 Textiles - Standard atmospheres for conditioning and testing 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 light blocking effect ability of textiles to block light transmission Note: It is expressed in terms of light blocking rate. 3.2 illuminance quotient of the luminous flux incident on an element containing the point divided by the area of the element Note: The unit is lux (lx). [Source: GB 50034-2013, 2.0.6, modified] 4 Principle The stable light with certain intensity is irradiated on the surface of the sample, and the illumination after the light passes through the sample is measured and compared with the illumination without the sample. The light blocking effect of the fabric is characterized by calculating the light blocking rate of the sample.

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Test method 6 Test report Bibliography

ICS 59.080.30 CCS W 55 中华人民共和国国家标准 GB/T 42999-2023 家用纺织品 织物遮光性的测定 照度计法 Home textiles - Determination of the light blocking effect of fabric - Illuminometer method 2023-09-07 发布 2024-04-01 实施 国家市场监督管理总局 国家标准化管理委员会 发布 目次 前言 3 1 范围 4 2 规范性引用文件 4 3 术语和定义 4 4 原理 4 5 试验方法 5 6 试验报告 5 参考文献 5 前言 本文件按照GB/T 1.1—2020《标准化工作导则 第1部分：标准化文件的结构和起草规则》的规定起草。 请注意本文件的某些内容可能涉及专利.本文件的发布机构不承担识别专利的责任。 本文件由中国纺织工业联合会提出。 本文件由全国家用纺织品标准化技术委员会(SAC/TC 302)归口。 家用纺织品 织物遮光性的测定 照度计法 1 范围 本文件描述了利用照度计测定织物遮光性的试验方法。 本文件适用于家用纺织品织物及其制品。 2 规范性引用文件 下列文件中的内容通过文中的规范性引用而构成本文件必不可少的条款。其中，注日期的引用文件，仅该日期对应的版本适用于本文件；不注日期的引用文件，其最新版本（包括所有的修改单）适用于本文件。 GB/T 6529 纺织品调湿和试验用标准大气 3 术语和定义 下列术语和定义适用于本文件。 3.1 遮光性 light blocking effect 纺织品阻止光线透过的性能。 注：以遮光率表示。 3.2 光照度 illuminance 入射在包含该点的面元上的光通量除以该面元面积所得之商。 注：单位为勒克斯（lx）。 ［来源：GB 50034—2013,2.0.6，有修改］ 4 原理 将稳定且具有一定强度的光照射在试样表面，测量光透过试样后的光照度，并与无试样时的光照度进行对比，通过计算试样的遮光率来表征织物的遮光性。