GB/T 41415-2022 (GB/T41415-2022, GBT 41415-2022, GBT41415-2022) & related versions
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Textiles -- Determination of dimensional change in dry heat or damp heat conditions
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GB/T 41415-2022
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GBT 41415-2022
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GB/T 41415-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.30
CCS W 04
Textile -- Determination of dimensional change in dry heat
or damp heat conditions
ISSUED ON: APRIL 15, 2022
IMPLEMENTED ON: NOVEMBER 1, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and Definitions ... 4
4 Principles ... 4
5 Test methods ... 5
6 Instruments and equipment ... 5
7 Atmosphere for humidity control and test ... 5
8 Sampling ... 6
9 Test steps ... 6
10 Calculation and presentation of the results ... 8
11 Test report ... 8
Appendix A (Normative) Processing method of specimens ... 10
Textile -- Determination of dimensional change in dry heat
or damp heat conditions
1 Scope
This document describes a test method for determining the rate of dimensional change
of textiles treated with dry heat or moist heat.
This document applies to all types of fabrics and their products.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 6529 Textiles -- Standard atmospheres for conditioning and testing
GB/T 6682 Water for analytical laboratory use -- Specification and test methods
GB/T 8628 Textiles -- Preparation, marking and measuring of fabric specimens and
garments in tests for determination of dimensional change
3 Terms and Definitions
There are no terms and definitions that need to be defined in this document.
4 Principles
The sample shall be conditioned in the specified standard atmosphere, marked, and
measured with a ruler or other measuring tool for initial dimensions; then, after
treatment under the specified conditions, such as the temperature, the humidity, and
time, measure its size again, and calculate the dimensional change rate of the sample
after dry heat or damp heat treatment.
5 Test methods
The test water shall be grade 3, which meets the requirements of GB/T 6682.
6 Instruments and equipment
6.1 Oven: The temperature can be adjusted within the range of room temperature to
200 °C, and it shall be accurate to 1 °C.
6.2 Constant temperature and humidity oven: the temperature can be adjusted within
the range of room temperature to 70 °C, and it shall be accurate to 1 °C; the relative
humidity can be adjusted to 85%, and it shall be accurate to 5%.
6.3 Measuring tools: a straightedge, and a steel tape; the length shall be greater than the
maximum size measured, and the unit shall be mm, accurate to 1 mm.
6.4 Marking tools: non-fading marker pens, fabric marking printers, and other marking
tools.
6.5 Flat measuring table: it shall be large enough to place the entire sample.
6.6 Metal mesh: it is used to support the sample without deformation; it shall be made
of stainless steel, and the area of the metal mesh shall be larger than the size of the
sample.
6.7 Pool or other containers: the size of the area shall be not less than 500 mm × 500
mm; it shall be able to make the surface of the sample wet.
6.8 Timer: it shall be accurate to 1 s.
6.9 Metal rod: it shall be metal material with a diameter of 5 mm~6 mm; it can be fixed
in the oven.
6.10 Heavy hammer hanging rod: it shall be metal material and used for hanging the
heavy hammer; its length shall be slightly longer than the width of the sample; the total
mass of the heavy hammer hanging rod and the heavy hammer shall be (500±5) g, the
diameter of the heavy hammer hanging rod shall be (5±1) mm.
7 Atmosphere for humidity control and test
The atmosphere for humidity control and testing shall be in accordance with the
standard atmospheric conditions specified in GB/T 6529.
8 Sampling
8.1 The samples shall be representative. Cut 3 samples at the position that is more than
150 mm away from the edge of the cloth and more than 1 m away from the end of the
cloth. Each sample shall contain yarns or fibers in different length and width directions,
and be marked with directions [warp direction (vertical direction), weft direction
(transverse direction)]. There shall be no creases, wrinkles, holes, dirt, or other
anomalies on the specimen. For samples tested under the treatment conditions of
Method 2 in Appendix A, if testing is required in both directions, the number of samples
shall be doubled.
8.2 The size of the cut sample shall be 300 mm×300 mm, and each side shall be parallel
to the length and width directions of the fabric, respectively.
Note: If the fabric may fall apart during the test, use the dimensionally stable sewing thread to overlock
sew the sample.
8.3 For special samples, such as narrow fabrics that are not enough for the production
of standard size samples, only cut in the length direction, and the size of the sample
shall be 300 mm × the entire width.
8.4 For textile products, follow the provisions of GB/T 8628; thereinto, the length of
the front piece, the length of the back piece, the total shoulder width, and the chest
width shall be tested for tops; for trousers, the length and waist width shall be tested;
for flat textile products, cut samples at the position that shall be more than 150 mm
away from the edge, and the samples shall meet the requirements of 8.2.
9 Test steps
9.1 The sample shall be adjusted the humidity to equilibrium in the standard atmosphere
specified in Chapter 7.
9.2 Place the sample on the measuring table, and make at least 3 pairs of marks
respectively in the length and width directions of the sample. The distance between each
pair of marks shall be 200 mm, and the distance between the marks and the edge of the
sample shall not be less than 50 mm. The marks shall be evenly distributed on the
sample; see Figure 1 and Figure 2 for examples.
9.3 Place the measuring tool (6.3) on the sample, and measure the distance between the
two marked points; the record shall be accurate to 1 mm.
9.4 Treat the sample according to Appendix A. Lay the conditioned sample on the
measuring table, and measure the distance between the two marked points; the record
shall be accurate to 1 mm. If the samples after the test appear blistering, falling apart,
Appendix A
(Normative)
Processing method of specimens
A.1 General
As required, select conditions from A.2, A.3, A.4, or A.5 to process the samples. Other
treatment conditions of temperature and humidity can also be adopted according to the
product standards or the negotiation between the interested parties; it shall be explained
in the test report.
A.2 Method 1: No-load dry heat treatment
Ordinary fabric: First, preheat the oven to the set temperature of 110 °C, spread the
sample on the metal mesh, and put them into the oven together. Start to time when the
temperature in the oven reaches (110±2) °C; after 5 min, take the sample out from the
oven, and place it horizontally in the standard atmospheric conditions specified in GB/T
6529 to adjust the humidity for 4 h.
For the polyurethane (PU) coated fabrics, the treatment temperature is (150±2) °C; for
the polyvinyl chloride (PVC) coated fabrics, the treatment temperature is (180±2) °C.
Note: No-load dry heat treatment conditions are suitable for automotive decorative textiles, synthetic
leather base fabrics, medical base fabrics, etc. The method can be used as a reference to other products
based on their product characteristics and application fields.
A.3 Method 2: Dry heat treatment under load
A.3.1 Along the length of the sample, sew a tubular edge respectively at the positions
that are 20 mm away from the edges of the upper and lower end of the sample, so as to
facilitate penetration of the metal rod and the heavy hammer hanging rod; cut a gap in
the middle of the tubular edge of the sample’s lower end for hanging the heavy hammer;
see Figure A.1.
A.3.2 Put the metal rod into the upper end of the sample and put the heavy hammer
hanging rod into the lower end of the sample.
A.3.3 First, preheat the oven to the set temperature of 180 °C. Hang the heavy hammer
on the heavy hammer hanging rod, and quickly put the combined sample into the oven.
Start to time when the temperature in the oven reaches 180 °C.
......
| Standard ID | GB/T 41415-2022 (GB/T41415-2022) | | Description (Translated English) | Textiles -- Determination of dimensional change in dry heat or damp heat conditions | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | W04 | | Classification of International Standard | 59.080.30 | | Word Count Estimation | 8,845 | | Date of Issue | 2022-04-15 | | Date of Implementation | 2022-11-01 | | Drafting Organization | China Textile Standard Inspection and Certification Co., Ltd., Zhejiang Dongjin New Materials Co., Ltd., Zhejiang Sanding Weaving Co., Ltd., Shenzhen Bergman Textile Co., Ltd., Huzhou Xinli Label Belt Manufacturing Co., Ltd., Zhejiang Yilei Wool Textile Co., Ltd., Zhejiang Bangjie Digital Knitting Co., Ltd., Donglun Technology Industrial Co., Ltd., Accurate Testing and Certification (Guangdong) Co., Ltd., Xiamen Huaxi Knitting Co., Ltd., Ruizhi (Hangzhou) Technology Co., Ltd., Jinjiang China Textile Standard Testing limited company | | Administrative Organization | National Textile Standardization Technical Committee (SAC/TC 209) | | Proposing organization | China National Textile and Apparel Council | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration |
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