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The tensile property part in this standard is not equivalent to that in "Testing Methods for Polyester Filament Yarns" (BISFA-2004), "Testing Methods for Polyamide Filament Yarns"(BISFA-2004) and Testing Methods for Viscose, Cupro, Acetate, Triacetate and Lyocell Filament Yarns" (BISFA-1997).
This standard supersedes "Testing Method for Drawability of Synthetic Filament Yarns" (GB/T 14344-2003).
Compared with GB/T 14344-2003, the main changes in this standard are as follows:
- The application scope is extended from synthetic filament yarns to cellulose fiber filament yarns (see Chapter 1);
- Rounding off for calculated result numbers is modified (Sections 8.1 and 8.9 in 2003 edition; Section 8.8 in this edition);
- Condition and time of standard atmospheres for conditioning and testing are modified (Chapter 6 in 2003 edition; Section 6.2 in this edition);
- Sampling requirements for spare part samples are added (see Article 6.1.1);
- Calculation of pre-tension load is added (see Article 6.3.1);
- Statistics part in the former standard is adjusted to Appendix C in this standard.
Appendix C in this standard is normative while Appendixes A and B are informative.
This standard was proposed by the China National Textile and Apparel Council.
This standard is under the jurisdiction of Shanghai Textile Industry Institute of Technical Supervision.
Drafting organizations of this standard: Jiangsu Hengli Chemical Fiber Co., Ltd., Textile Industry Chemical Fiber Products Quality Supervision Center, Petroleum Industry Synthetic Fiber Quality Supervision and Inspection Center, Jiangsu Shenghong Chemical Fiber Co., Ltd., Baoding Swan Chemical Fiber Co., Ltd. and Xinxiang Chemical Fiber Co., Ltd.
Chief drafting staff of this standard: Ding Jianzhong, Lu Xiuqin, Zhang Yushi, Cheng Qian, Chen Haoling, Liu Chufeng and Lei Ming.
The previous editions of the standard superseded by this standard are as follows:
- GB/T 14344-1993 and GB/T 14344-2003.
Testing Method for Tensile of Man-made Filament Yarns
化學纖維 長絲拉伸性能試驗方法
1 Scope
This standard specifies the testing method for tensile property of man-made filament yarns like polyester (polyester fiber), polyamide (chinlon), polypropylene (polypropylene fiber) and cellulose fiber.
This standard is applicable to man-made filament yarns (pre-oriented yarn, fully drawn yarn and textured filament yarn), and may serve as reference for man-made filament yarn extracted from fabric.
This standard is not applicable to the filament yarn with elongation greater than 0.5% when the tension increasing from 0.05cN/dtex to 0.1cN/dtex.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 3291.1 Textiles - Terms of Textile Material Properties and Test - Part 1: Fiber and Yarn
GB/T 3291.3 Textiles - Terms of Textile Material Properties and Test - Part 3: General
GB/T 6502 Sampling Method for Synthetic Filament Yarns
GB/T 6529 Standard Atmospheres for Textiles Conditioning and Testing
GB/T 8170 Rules for Rounding off of Numerical Values
GB/T 14343 Testing Method for Linear Density of Man-made Filament Yarns
3 Terminologies and Definitions
For the purposes of this standard, the terms and definitions specified in GB/T 3291.1 and GB/T 3291.3 and those listed below apply.
4 Principle
Pull the fiber on a constant-rate stretching tester until break under specified conditions, and then obtain the measured values of tensile properties like breaking force, elongation at break, elongation at specified load, load at specified elongation, initial modulus and breaking work of the specimen from the force-elongation curve, data display or data collection system.
5 Devices and Materials
5.1 Manual loading or automatic loading device may be adopted for the specimen loading on constant-rate elongation tester (CRE). The following devices shall be equipped:
a) Electronic dynamometer.
b) Automatic recorder or data collection system which can draw out force-elongation curve. The data collection rate of data collection system shall be high enough to ensure that the maximum allowable difference between actual force and indicated force is less than 1% of the actual force and that between actual elongation and indicated elongation is less than 0.5mm.
c) Holder, which shall meet the following requirements:
1) The holder may hold the specimen at specified gauge length;
2) The holder may set a minimum gauge length of 250mm;
3) Mobile holder travels at constant speed with speed variation less than 4%;
4) During continuous testing, the maximum allowable difference of mobile holder backing to different initial positions is less than 0.25mm;
5) The holder shall be able to hold the specimen without sliding, and shall not result in break at jaw through damaging the specimen.
Notes:
1 Standard jaw of the holder shall be plane and linerless. However, if specimen sliding is inevitable, other holders, like lined-plane holder or bitt holder, may be used according to agreement.
2 Since the holder type may impose certain effect on the elongation at break of the specimen, holders of the same type shall be adopted by related parties.
5.2 Other testing devices and materials:
a) Measuring reel: used to make laboratory sample into tested fiber;
b) Ryce or similar device: used to support the test fiber under zero tension so as to smoothly transfer the filament yarn to the tensile tester;
c) Rotating cylinder sub-frame: used to support the laboratory sample so as to make it easy to transfer the specimen under low tension;
d) Flexible cylinder: for twisted filament yarn, flexible cylinder is provided to avoid untwisting during conditioning or relaxation;
e) Container: used to dip specimen in water;
f) Distilled water, soft water or deionized water;
g) 0.1% non-ionic surfactants water solution.
Foreword
1 Scope
2 Normative References
3 Terminologies and Definitions
4 Principle
5 Devices and Materials
6 General Principles for Testing
7 Testing Procedure
8 Result Calculation
9 Allowable Tolerance
10 Testing Report
Appendix A (Informative) Rapid Conditioning Method
Appendix B (Informative) Calculation Method for Pre-tension
Appendix C (Normative) Statistics: Terminologies and Calculation
