GB/T 14338-2022_English: PDF (GB/T14338-2022)
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Man-made fibre -- Test method for crimping performance of staple fibre
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Testing method for crimping performance of man-made staple fibres
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Testing method for crimping performance of synthetic staple fibres
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Standard ID | GB/T 14338-2022 (GB/T14338-2022) | Description (Translated English) | Man-made fibre -- Test method for crimping performance of staple fibre | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | W50 | Classification of International Standard | 59.060.20 | Word Count Estimation | 11,138 | Date of Issue | 2022-04-15 | Date of Implementation | 2022-11-01 | Drafting Organization | Testing by Shanghai Textile Industry Technical Supervision Institute, Sinopec Shanghai Petrochemical Co., Ltd., Ningbo Dafa Chemical Fiber Co., Ltd., Sinopec Yizheng Chemical Fiber Co., Ltd., Xiamen Xianglu Chemical Fiber Co., Ltd., China Chemical Fiber Industry Association, Shanghai Textile Group Standard Co., Ltd., Guangzhou Inspection and Certification Group Co., Ltd., Chuzhou Xingbang Polymer Color Fiber Co., Ltd., Jiangsu Huaxi Village Co., Ltd. Special Chemical Fiber Factory, Changzhou Huafang Textile Instrument Co., Ltd., Weifang Xinlong Biological Material Co., Ltd., Tangshan Sanyou Group Xingda Chemical Fiber Co., Ltd., Sinopec Chongqing Chuanwei Chemical Co., Ltd., Weihai Haima Dahua Carpet Co., Ltd., Jiangsu Aoshen New Material Co., Ltd., Jiangsu Tongkun Hengyang Chemical Fiber Co., Ltd., Xinfengming Jiangsu Xintuoxin Materials Co., Ltd., Yibin | Administrative Organization | National Chemical Fiber Standardization Technical Committee (SAC/TC 586) | Proposing organization | China National Textile and Apparel Council | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | Standard ID | GB/T 14338-2008 (GB/T14338-2008) | Description (Translated English) | Testing method for crimping performance of man-made staple fibres | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | W50 | Classification of International Standard | 59.060.01 | Word Count Estimation | 11,111 | Date of Issue | 2008-06-18 | Date of Implementation | 2009-03-01 | Older Standard (superseded by this standard) | GB/T 14338-1993 | Quoted Standard | GB/T 3291.1; GB/T 6529; GB/T 8170; GB/T 14334 | Adopted Standard | JIS L1015, NEQ | Drafting Organization | Chemical Fiber Textile Industry Products Quality Supervision Center | Administrative Organization | Shanghai Textile Industrial Technology Authority | Regulation (derived from) | National Standard Approval Announcement 2008 No.10 (Total No.123) | Proposing organization | China Textile Industry Association | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, China National Standardization Administration Committee | Summary | This standard specifies test methods for chemical fiber short fiber crimp performance. This standard applies to polyester (PET), determination of chemical fibers such as cellulose fiber short fiber crimp performance, polypropylene (PP), , polyvinyl formal (PVA) Polyamide (nylon), polyacrylonitrile (acrylic). | Standard ID | GB/T 14338-1993 (GB/T14338-1993) | Description (Translated English) | Testing method for crimping performance of synthetic staple fibres | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | W50 | Classification of International Standard | 59.060.20 | Word Count Estimation | 5,511 | Date of Issue | 1993/4/20 | Date of Implementation | 1993/12/1 | Adopted Standard | JIS L1015-1981, NEQ | Regulation (derived from) | Announcement of Newly Approved National Standards No. 10, 2008 (No. 123 overall) | Proposing organization | Ministry of Textile Industry of the People Republic of China | Issuing agency(ies) | State Bureau of Technical Supervision |
GB/T 14338-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.060.20
CCS W 50
Replacing GB/T 14338-2008
Man-made 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
Man-made Fiber - Test Method for Crimping Performance
of Staple Fiber
1 Scope
This document describes the test method for the crimping performance of man-made fiber ---
staple fiber.
This document is applicable to man-made 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 - Man-made Fibers
GB/T 9994 Conventional Moisture Regains of Textile Materials
GB/T 14334 Sampling Method for Man-made 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 Pre-conditioning, Standard Atmosphere for Humidity-conditioning and
Testing, and Humidity-conditioning Time
6.2.1 Pre-conditioning
When the sample complies with one of the following conditions, pre-conditioning 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 pre-conditioning: 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 humidity-conditioning 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,
Jdi---the crimp elasticity of a single fiber, expressed in (%);
L1i---the length of a single fiber when it is subject to heavy tension (7.4), expressed in (mm);
L2i---after 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);
L0i---the 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,
CV---the coefficient of variation of n test results;
s---the standard deviation of n test results;
𝑥---the arithmetic mean of n tests.
B.2 Calculation of Increased Number of Test Fibers
B.2.1 Half-width value of confidence interval
The half-width value (c) of confidence interval of n test results is calculated in accordance with
Formula (B.4):
Where,
c---the half-width value of confidence interval of n test results;
t---the value of t distribution (at the required 95% confidence level, it can be found through
Table B.1);
s---the standard deviation of n test results;
n---the number of tests.
The half-width value (c) of confidence interval is usually expressed as a percentage of the
arithmetic mean and calculated in accordane with Formula (B.5):
Where,
C---the half-width value of confidence interval expressed as a percentage of the arithmetic mean
of n test results;
c---the half-width value of confidence interval of n test results;
𝑥---the arithmetic mean of n tests.
B.2.2 Re-determination of the number of test fibers
After testing n fibers, in accordance with Formula (B.5), calculate the half-width 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
......
GB/T 14338-2008
Testing method for crimping performance of man-made staple fibres
ICS 59.060.01
W50
National Standards of People's Republic of China
Replacing GB/T 14338-1993
Chemical fiber staple crimp performance test method
Posted 2008-06-18
2009-03-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard and JISL1015 "Test Methods for Chemical staple fiber" curl degree of consistency part is non-equivalent.
This standard replaces GB/T 14338-1993 "synthetic staple fiber curl performance test method."
This standard compared with GB/T 14338-1993, the main changes are as follows.
--- Increased crimp elastic instrument technical requirements (see 5.1.1);
--- Increase the extraction and the number of tests to determine the parts of the laboratory sample (see 6.1);
--- Increasing the humidity-time laboratory sample (see 6.2.1);
--- Modify the relative humidity of the humidity and atmospheric testing standards (see 6.2.2);
--- Increased pre-tension method of obtaining (see 6.2.4);
--- Increasing the confidence interval half-width value (± 3%) (see 6.3);
--- Increased humidity-fast method (see Appendix A).
Appendix C of this standard is a normative appendix, Appendix A, Appendix B, Appendix D are informative appendices.
The standard proposed by China Textile Industry Association.
This standard by the Shanghai textile industry technical supervision of the centralized.
This standard was drafted. textile fiber product quality supervision center, synthetic oil industry Quality Supervision and Inspection Center of Yizheng
Fiber Co., Ltd., Jiangsu three bedrooms Lane Group Co., Ltd. Shanghai Alliance Kyrgyzstan synthetic fiber.
The main drafters of this standard. Lu Xiuqin, Zhang language Shi, Xu Meiying, Zhang Lingxia, Huo Ling, Yang Yan.
This standard replaces the standards previously issued as follows.
--- GB/T 14338-1993.
Chemical fiber staple crimp performance test method
1 Scope
This standard specifies the test method for chemical fiber short fiber curl properties.
This standard applies to polyester (PET), polyamide (nylon), polyacrylonitrile (acrylic), polypropylene (PP), polyvinyl formal (dimension
Lun), cellulose fiber and other chemical fiber short fiber crimp performance measurement.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 3291.1 textile material properties and test - Part 1. fibers and yarns
GB/T 6529 textiles conditioning and testing - Standard atmospheres
GB/T 8170 numerical rounding rules
GB/T 14334 chemical fiber staple sampling method
3 Terms and Definitions
Terms and definitions GB/T 3291.1 established apply to this standard.
Principle 4
In the predetermined load, the force within a certain time, measured changes in length of the fibers, to determine the number of crimps of the fibers, crimp ratio, crimp back
Repetition rate and crimp modulus of elasticity and other properties.
5 equipment and instruments
5.1 meters and the number of crimps crimp elastic instrument.
Crimp elastic instrument technical requirements.
a) force accuracy.
--- Scale range 5mN, its minimum scale value 0.01mN;
----Scale range of 10mN, its minimum scale value 0.02mN;
----Scale range of 10mN more, the minimum scale value 0.05mN.
b) the length of the resolution 0.01mm.
c) force measurement error ≤1%.
5.2 cashmere plate. a contrasting color and fiber.
5.3 tweezers.
6 General Test
6.1 Sampling
Laboratory samples were taken --- parts demand; but shall not be less than 10g.
--- Bulk sample laboratory samples taken according to GB/T 14334 regulations.
NOTE. Do not extract moisture in transit accidents, damaged packaging, or the package has been opened.
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