GB/T 21655.2-2019 PDF English
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| GB/T 21655.2-2019 | English | 135 |
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Textiles - Evaluation of absorption and quick-drying - Part 2: Method for moisture management tests
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| GB/T 21655.2-2009 | English | 170 |
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Textiles -- Evaluation of absorption and quick-drying -- Part 2: Method for moisture management tests
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GB/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 Contents
Foreword... 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... 12
Foreword
GB/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 tests
1 Scope
This 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 references
The 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 testing
3 Terms and definitions
For 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 Principle
Horizontally 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 reagents
5.1 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 Reagents
6 Standard atmospheres for wet conditioning and test
Atmospheres for wet conditioning and test are in accordance with standard
atmospheres specified in GB/T 6529.
7 Sampling and test preparation
7.1 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 rating
9.1 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 marks
10.1 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 report
Test 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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