GB/T 143382022 PDF in English
GB/T 143382022 (GB/T143382022, GBT 143382022, GBT143382022)
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Manmade fibre  Test method for crimping performance of staple fibre
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Standards related to: GB/T 143382022
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GB/T 143382022: PDF in English (GBT 143382022) GB/T 143382022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.060.20
CCS W 50
Replacing GB/T 143382008
Manmade Fiber  Test Method for Crimping Performance
of Staple Fiber
ISSUED ON: APRIL 15, 2022
IMPLEMENTED ON: NOVEMBER 1, 2022
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 ... 5
5 Instruments and Tools ... 5
6 General Rules of Test ... 6
7 Test Procedures ... 8
8 Result Calculation ... 9
9 Test Report ... 10
Appendix A (informative) Calculation Method for Heavy Tension ... 11
Appendix B (normative) Calculation of Statistical Values and Increased Number of Test
Fibers ... 12
Appendix C (normative) Crimp Counting Method ... 15
Manmade Fiber  Test Method for Crimping Performance
of Staple Fiber
1 Scope
This document describes the test method for the crimping performance of manmade fiber 
staple fiber.
This document is applicable to manmade fiber  staple fiber.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 4146 (all parts) Textiles  Manmade Fibers
GB/T 9994 Conventional Moisture Regains of Textile Materials
GB/T 14334 Sampling Method for Manmade Staple Fibers
3 Terms and Definitions
The terms and definitions defined in GB/T 4146 (all parts) are applicable to this document.
4 Principle
Under the specified tension, read the crimp peak and crimp valley of the fiber; under different
tensions, within a certain stress time, determine the length variation of the fiber. Thus, the
crimping performance data, such as: crimp number, crimp rate, crimp recovery rate and crimp
elasticity of the fiber is obtained.
5 Instruments and Tools
5.1 Crimp elasticity tester, which needs to satisfy the following requirements:
a) The force measurement error is less than or equal to 1%;
b) Length resolution: 0.01 mm;
c) Equipped with a device for precise calibration of the instrument.
5.2 Fleece board: form a contrasting color with the fiber.
5.3 Tweezers, etc.
6 General Rules of Test
6.1 Sampling
The rules of the sampling are as follows:
For the laboratory samples of bulk items, take out as needed, and the minimum size shall
not be less than 10 g;
For the laboratory samples from batch samples, conduct the sampling in accordance
with the stipulations of GB/T 14334.
Packages that are accidentally damp, damaged or opened during transportation shall not be
taken as samples.
6.2 Preconditioning, Standard Atmosphere for Humidityconditioning and
Testing, and Humidityconditioning Time
6.2.1 Preconditioning
When the sample complies with one of the following conditions, preconditioning is required:
When the moisture regain of the specimen exceeds the conventional moisture regain;
When the sample is in an atmosphere with a relative humidity higher than the upper
limit of the relative humidity of the laboratory;
When the temperature of the sample is 5 C lower than the laboratory temperature.
Conditions for preconditioning: at a temperature not exceeding 50 C and a relative humidity
of 10% ~ 25%, place for at least 30 min.
The conventional moisture regain shall comply with the stipulations of GB/T 9994.
6.2.2 Standard atmosphere for humidityconditioning and testing
For the staple fiber with a conventional moisture regain less than 4.5%, the temperature is (20
2) C and the relative humidity is (65 5)%.
For the staple fiber with a conventional moisture regain greater than or equal to 4.5%, the
Calculate in accordance with Formula (5):
Where,
Jdithe crimp elasticity of a single fiber, expressed in (%);
L1ithe length of a single fiber when it is subject to heavy tension (7.4), expressed in (mm);
L2iafter the load is removed, the length of a single fiber when it recovers for 2 min, then, is
subject to light tension (7.5) again, expressed in (mm);
L0ithe length of a single fiber when it is subject to light tension (7.3), expressed in (mm).
8.5 Result Expression
All test results are expressed as the arithmetic mean of valid test values.
8.6 Calculation of Statistical Values
The calculation of statistical values, such as: arithmetic mean, standard deviation and
coefficient of variation shall comply with Appendix B.
8.7 Data Rounding
All results are rounded to one decimal place.
9 Test Report
The test report shall include:
a) The Standard used (including year of issue);
b) The name and specifications of the sample;
c) The test method used and all test parameters;
d) The results of various performance tests of laboratory samples; if the standard
deviation and coefficient of variation are calculated, then, they should be written into
the report;
e) After negotiation, reminders for modification of test procedures and other parts
inconsistent with this document;
f) Abnormal phenomena observed in the test;
g) Test personnel, test date.
Where,
CVthe coefficient of variation of n test results;
sthe standard deviation of n test results;
𝑥the arithmetic mean of n tests.
B.2 Calculation of Increased Number of Test Fibers
B.2.1 Halfwidth value of confidence interval
The halfwidth value (c) of confidence interval of n test results is calculated in accordance with
Formula (B.4):
Where,
cthe halfwidth value of confidence interval of n test results;
tthe value of t distribution (at the required 95% confidence level, it can be found through
Table B.1);
sthe standard deviation of n test results;
nthe number of tests.
The halfwidth value (c) of confidence interval is usually expressed as a percentage of the
arithmetic mean and calculated in accordane with Formula (B.5):
Where,
Cthe halfwidth value of confidence interval expressed as a percentage of the arithmetic mean
of n test results;
cthe halfwidth value of confidence interval of n test results;
𝑥the arithmetic mean of n tests.
B.2.2 Redetermination of the number of test fibers
After testing n fibers, in accordance with Formula (B.5), calculate the halfwidth value (C) of
confidence interval expressed as a percentage of the arithmetic mean of n test results. If it
exceeds the specified allowable value, the number m of test fibers that shall be increased is
...... Source: Above contents are excerpted from the PDF  translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
