苎麻理化性能试验方法   Test methods for physical and chemical properties of ramie fiber  ICS  59.060.10 CCS  W 30   中华人民共和国国家标准 GB/T 5881—2024 代替 GB/T 5881～5889—1986 2024-07-2 4发布 2025-02-0 1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   ·····································································································   Ⅴ 1     范围   ··································································································   1 2     规范性引用文件   ······················································································   1 3     术语和定义   ···························································································   1 4     取样   ··································································································   1      4.1     批样   ······························································································   1      4.2     实验室样品   ······················································································   2      4.3     试验样品   ·························································································   2 5     回潮率和含水率   ······················································································   4      5.1     原理   ······························································································   4      5.2     仪器和用具   ······················································································   4      5.3     试验步骤   ·························································································   4      5.4     结果计算与表示   ·················································································   4      5.5     试验报告   ·························································································   5 6     白度   ··································································································   5      6.1     原理   ······························································································   5      6.2     仪器和用具   ······················································································   5      6.3     试验步骤   ·························································································   5      6.4     结果计算与表示   ·················································································   6      6.5     试验报告   ·························································································   6 7     长度   ··································································································   6      7.1     预调湿和试验用标准大气   ········································································   6      7.2     仪器和用具   ······················································································   7      7.3     试验步骤   ·························································································   7      7.4     结果计算与表示   ·················································································   8      7.5     试验报告   ·························································································   9 8     线密度   ································································································   9      8.1     原理   ······························································································   9      8.2     试验条件   ·························································································   9      8.3     仪器和用具   ······················································································   9      8.4     试验步骤   ·························································································   9      8.5     结果计算与表示   ················································································   10      8.6     试验报告   ························································································   10 9     单纤维断裂强度、单纤维断裂伸长率   ·······································