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GB/T 21655.2-2019: Textiles - Evaluation of absorption and quick-drying - Part 2: Method for moisture management tests Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 21655.2: Historical versions
Similar standardsGB/T 21655.2-2019: Textiles - Evaluation of absorption and quick-drying - Part 2: Method for moisture management tests---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT21655.2-2019 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 59.080.30 W 04 Replacing GB/T 21655.2-2009 Textiles - Evaluation of absorption and quick-drying - Part 2.Method for moisture management tests Issued on. JUNE 04, 2019 Implemented on. JANUARY 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 5 4 Principle... 6 5 Devices and reagents... 6 6 Standard atmospheres for wet conditioning and test... 7 7 Sampling and test preparation... 7 8 Test procedures... 8 9 Result calculation and rating... 8 10 Evaluation and marks... 10 11 Test report... 11 Annex A (informative) Sensor structure and data acquisition principle... 12ForewordGB/T 21655 “Textiles - Evaluation of absorption and quick-drying” consists of two parts. - Part 1.Method for combination tests; - Part 2.Method for moisture management tests. This Part is Part 2 of GB/T 21655. This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 21655.2-2009 “Textiles - Evaluation of absorption and quick-drying - Part 2.Method for moisture management tests”. Compared with GB/T 21655.2-2009, main technical changes are as follows. - added description and requirements for composition structure of instrument (see Clause 5 of this Edition); - modified instrument structure diagram of original Annex A and adjusted it to Clause 5; - modified conductivity tolerance of test standard solution as 0.2mS; added 25°C test temperature conditions (see 5.2.2 of this Edition); - modified dropped test solution as (0.22±0.01)g (see 8.2 of this Edition, 8.1.2 of Edition 2009); - deleted calculation of dynamic transport comprehensive index of liquid water in 9.1.4 of Edition 2009; - combined moisture-absorption index and quick-drying index; uniformly accessed moisture-absorption quick-drying; - deleted comprehensive quick-drying index; not separately accessed perspiration; added moisture-absorption perspiration (see Table 2 of Edition 2009); - added mark of moisture-absorption quick-drying (see 10.2 of this Edition); - modified sensor structure diagram as well as probe pitch and contact surface diameter (see A.1 of this Edition, Annex A.5 of Edition 2009); - modified schematic diagram of data acquisition (see A.2 of this Edition, Annex A.1 of Edition 2009); - deleted calibration and alignment of instrument (see Annex A.5 of Edition 2009). Attention is drawn to the possibility that some of the elements of this Part may be the subject of patent rights. The issuing authority shall not be held responsible for identifying any or all such patent rights. This Part was proposed by China Textile Industry Federation. This Part shall be under the jurisdiction of National Technical Committee on Textiles of Standardization Administration of China (SAC/TC 209). The drafting organizations of this Part. China Textile Standard Inspection and Certification Co., Ltd., Silai Asia Pacific (Shenzhen) Co., Ltd., Anta (China) Co., Ltd., Hong Kong Polytechnic University, Nike Sports (China) Co., Ltd., Lutai Textile Co., Ltd., 361 Degrees (China) Co., Ltd., Hosa Industrial (Fujian) Co., Ltd., Quanzhou Haitian Material Technology Co., Ltd., Shanghai Entry-Exit Inspection and Quarantine Bureau Industrial Products and Raw Materials Testing Technology Center, Wenzhou Fangyuan Instrument Co., Ltd., Beijing Pathfinder Outdoor Products Co., Ltd., Shandong Ruyi Technology Group Co., Ltd., Dongguan Chaoying Textile Co., Ltd. Main drafters of this Part. Ren Hening, Zhang Hui, Hu Junyan, Wang Baojun, Li Yi, Jian Zhiguang, Li Xiaowen, Li Su, Gao Zhifang, Liu Zhengqin, Xie Junfeng, Kong Linghao, Chen Liqun, Ding Cailing, Wei Mengyuan, Chen Jian, Liu Hongwan, Zhao Hui, Wang Wei. Version of standard substituted by this Standard is. - GB/T 21655.2-2009. Textiles - Evaluation of absorption and quick-drying - Part 2.Method for moisture management tests1 ScopeThis Part of GB/T 21655 specifies method and evaluation index that use moisture management method to determine moisture-absorption quick-drying and moisture-absorption perspiration of textiles. This Part is applicable to various textiles.2 Normative referencesThe following referenced documents are indispensable for the application 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/T 6529, Textiles - Standard atmospheres for conditioning and testing GB/T 6682, Water for analytical laboratory use - Specification and test methods GB/T 8629-2017, Textiles - Domestic washing and drying procedures for textile testing3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply. 3.1 wetting time; T The time required from liquid touches fabric surface till fabric starts absorbing moisture. It is represented by the time when the first slope is greater than or equal to tan15° on moisture-time relationship curve. 3.2 absorption speed; A The increase rate of moisture content per unit time of fabric. On moisture content change curve, it is average slope of moisture content change curve within testing time. 3.3 maximum wetting radius; R The maximum radius of wetting area since fabric begins to wet till specified time ends. On moisture curve, it is the maximum radius of wetting area when the first slope of curve is greater than or equal to tan15° till testing time ends.4 PrincipleHorizontally place fabric sample. After test solution touches its wetting surface, liquid water shall spread along with wetting surface of fabric and transport from fabric’s wetting surface to permeable surface. At the same time, it shall spread on permeable surface of fabric. The process of change in water content is a function of time.5 Devices and reagents5.1 Testing instrument of dynamic transport performance of liquid water Testing instrument of dynamic transport performance of liquid water (see Figure 1) mainly includes sensor module, water supply module, data acquisition module, in accordance with following requirements. 5.2 Reagents6 Standard atmospheres for wet conditioning and testAtmospheres for wet conditioning and test are in accordance with standard atmospheres specified in GB/T 6529.7 Sampling and test preparation7.1 Sample’s sampling method and quantity are in accordance with product standard or agreed by parties concerned. 7.2 Cut each sample into two pieces, one for test prior to washing and the other for post-washing test. Washing method. continuously wash 5 times according to 4N program of Type A washing machine in GB/T 8629-2017 or wash according to method agreed by parties concerned and number of times. After washing, dry sample at a temperature not exceeding 60°C or naturally dry it. 8.3 Take sample out. Use clean absorbent paper to absorb excessive residual liquid from sensor board. Place still for at least 60s. Ensure that there shall be no residual liquid before testing again. 8.4 Repeat steps of 8.1~8.3 till all samples are tested.9 Result calculation and rating9.1 Calculation 9.1.1 Absorption speed A Respectively calculate average absorption speed of wetting surface AT and average absorption speed of permeable surface AB according to formula (1). Round the values off to 0.1. 9.1.2 Spreading speed S Calculate spreading speed S according to formula (2). Round value off to 0.1. 9.2 Rating Perform rating according to requirements in Table 1.10 Evaluation and marks10.1 Evaluation When necessary, evaluate product’s corresponding performances according to Table 2.When corresponding performance of product before washing and after washing meets technical requirements in Table 2, the product shall be clearly indicated as the one of corresponding performance in product’s user manual.11 Test reportTest report shall contain following information. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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