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GB/T 21655.1-2023 (GB/T21655.1-2023)

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GB/T 21655.1-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.30
CCS W 04
Replacing GB/T 21655.1-2008
Textiles - Evaluation of absorption and quick-drying - Part
1: Method for combination tests
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Principle ... 7
5 Equipment, materials and reagents ... 7
6 Standard atmosphere for humidity control and testing ... 8
7 Sampling and specimen preparation ... 8
8 Test procedures ... 9
9 Evaluation and marks ... 12
10 Test report ... 13
Textiles - Evaluation of absorption and quick-drying - Part
1: Method for combination tests
1 Scope
This document describes the test method for the single test indicator combination of the
moisture absorption and quick-drying performance of textiles. It also gives the
evaluation indicators.
This document applies to all types of textile products.
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
FZ/T 01071, Textiles -- Test method for capillary effect
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 water absorption rate
The percentage of the water absorbed by the specimen to the original mass of the
specimen when the specimen is completely soaked in water and taken out until there is
no dripping water.
3.2 drip diffusion time
Water is dropped on the specimen, and the time required from when the water drop
touches the specimen to when it completely diffuses and penetrates into the fabric.
3.3 drying rate
The amount of water evaporated in the specimen per unit time.
3.4 wicking height
The measurement of capillary effect of test material. That is, hen one end of a vertically
suspended textile material is soaked by water, the height that water rises along the
textile material within a certain period of time through capillary action.
4 Principle
Measure the water absorption rate, drip diffusion time, drying rate and wicking height
of the fabric under specified conditions to simulate the process of water absorption,
diffusion and drying in the fabric, so as to comprehensively characterize the moisture
absorption and quick-drying performance of the fabric.
5 Equipment, materials and reagents
5.1 Balance: the weighing accuracy is 0.001 g.
5.2 Micropipette: can quantitatively add a specified volume of water with an accuracy
of 0.01 mL.
5.3 Specimen suspension device: keep the specimen stable during the test.
5.4 Grade three water specified in GB/T 6682.
5.5 Timer: the precision is not less than 0.1s.
5.6 Specimen holder: made of water-repellent material, capable of supporting the
specimen horizontally above the surface on which the support is placed. The diameter
of the central area shall be at least 150 mm. See Figure 1 for an example. Embroidery
rings that meet size requirements can be used as specimen holders. If the relevant
requirements of the exposed area of the test specimen can be met, a frame with pins or
clips on the frame can also be selected.
7.2 Cut each sample into two pieces. One of them is used for pre-wash test and the other
is used for post-wash test. The washing method is according to 4N program of type A
standard washing machine in GB/T 8629-2017. Conduct continuous washing 5 times.
Use standard detergent 3. Dry naturally after washing. It can also be washed according
to the number of washings agreed by the parties concerned, but the number of washings
shall be at least 5 times.
7.3 Cut the specimen. The number and size of the test specimens shall meet the
requirements in Chapter 8. For fabric samples, when cutting samples, they shall be
evenly arranged in the area above 150 mm from the edge of the selvage. Each specimen
shall not be in the same warp (longitudinal) and weft (horizontal) position. For finished
products, specimens shall be selected from the main functional fabrics. Sampling shall
avoid defects and wrinkles that affect the test results.
8 Test procedures
8.1 Water absorption rate
8.1.1 Cut 3 specimens. The size of each specimen shall be at least 10 cm × 10 cm. The
specimen shall be flat without wrinkles. Make sure that the edge yarn does not come
off during the test.
8.1.2 Place the specimen under standard atmospheric conditions (6.1) and adjust the
humidity to balance.
8.1.3 Use a balance to weigh the original mass m0 of the specimen, accurate to 0.001 g.
8.1.4 Put the specimen into a container filled with tertiary water. The specimen sinks
naturally after absorbing water. If the specimen cannot sink naturally, you can press the
specimen into the water and lift it up. Repeat 2~3 times.
8.1.5 Take out the specimen after soaking it in water for 5 mins. Hang the specimen
naturally flat and vertically on the specimen suspension device (5.3). The water in the
specimen drips naturally.
8.1.6 Observe carefully. When the specimen is no longer dripping, immediately weigh
the specimen mass m, accurate to 0.001 g. When the time interval between two drops
of water is not less than 30 s, it can be considered that the specimen is no longer dripping.
8.1.7 Calculate the water absorption rate of each specimen according to formula (1).
Where,
A - the water absorption rate;
m0 - the original mass of the specimen, in grams (g);
m - the mass of the specimen after soaking and dripping water, in grams (g).
Calculate the average value of the water absorption of the 3 specimens before and after
washing. The result is rounded to 1%.
8.2 Drip diffusion time
8.2.1 Cut 3 specimens. The size of the specimen shall ensure that it can be fixed on the
specimen holder without affecting the diffusion of water droplets. The specimen shall
be flat and free of wrinkles.
8.2.2 Place the specimen under standard atmospheric conditions (6.1) and adjust the
humidity to balance.
8.2.3 Fix the specimen flatly on the specimen holder (the side close to the human skin
faces up when in use). At the same time, it shall be noted that the specimen shall not be
deformed by external force. Inhale an appropriate amount of tertiary water with a
dropper. Put 1 drop (about 0.05 mL) of water on the specimen. The distance between
the mouth of the dropper and the surface of the sample shall not exceed 1 cm. The
dropper angle is about 45°.
8.2.4 Carefully observe the diffusion of water droplets. Use a timer to measure the time
required for the water drop to touch the surface of the specimen to completely diffuse
(no specular reflection anymore), accurate to 0.1 s. If the test result is less than 1 s,
record the diffusion time as < 1.0 s. If the diffusion speed of the water droplets is slow,
and the water droplets have not completely diffused after a certain period of time (such
as 60 s), the test can be stopped. Record that the diffusion time is greater than the set
time (for example, >60 s).
8.2.5 Calculate the average diffusion time of 3 specimens before and after washing.
Round the results to 0.1 s.
8.3 Drying rate
8.3.1 Cut 3 specimens. The size of each specimen shall be at least 10 cm × 10 cm.
Ensure that moisture cannot diffuse to the edge of the specimen. The specimen shall be
flat and free of wrinkles. Make sure that the edge yarn does not come off during the test.
8.3.2 Place the specimen under standard atmospheric conditions (6.1) and adjust the
humidity to balance.
8.3.3 Weigh the original mass m0 of the specimen first. Weigh the mass with accuracy
to 0.001 g. Use the micropipette (5.2) to take an appropriate amount of grade 3 water.
Drop 0.2 mL ± 0.01 mL of water on the center of the specimen. Make sure all drips are
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.