GB/T 14337-2022 Man-made fibre - Test method for tensile properties of staple fibre
1 Scope
This standard describes the test for tensile properties of single man-made staple fibre.
This document is applicable to man-made staple fibres with a nominal staple length of not less than 20mm.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 4146 (all parts) Textiles - Man-made fibers
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 9994 Conventional moisture regains of textile materials
GB/T 14334 Sampling method for man-made staple fibres
GB/T 14335 Testing method for linear density of man-made staple fibres
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 4146 (all parts) apply.
4 Principle
The single fibre, under the specified conditions, is extended to break on a constant-rate-of-extension tensile tester, thus the data of specimen tensile properties such as breaking force, breaking tenacity, elongation at break, strength at specified elongation, initial modulus and modulus are obtained from the force-extension curve or data collection system.
5 Devices and materials
5.1 Constant-rate-of-extension (CRE) single fibre tensile tester
5.1.1 The tensile tester shall be equipped with the following devices:
a) a device that indicates or records the tension applied to a specimen and the corresponding extension value;
b) a device capable of drawing force-extension curve or equipped with a data collection system;
c) clamps that appropriately hold a single fibre at the desired nominal gauge length;
d) a device with different tensile speeds;
e) a device for accurate calibration of the instrument.
5.1.2 The instrument shall meet the following technical requirements:
a) the indication error of applied force shall not exceed 1%;
b) the indication error of extension shall not exceed 0.1mm;
c) the error of clamping length shall not exceed 0.2mm;
d) the instrument shall be extended at a constant speed, and the difference between the speed of the lower clamp and the specified speed shall not exceed 5% 1s after the strength tester is activated;
e) the clamp shall have an adjustment device to give the fibre an appropriate clamping force when clamping the fibre to prevent the fibre from slippage or damage; the surface of the clamp jaws in contact with the specimen may have a layer of lining to minimize the slippage or damage of the specimen in the clamping area;
f) an adjustable automatic clamp shall be used in arbitration;
g) the mass error of the pretension clamp shall not exceed 10% of the nominal value.
5.2 Other test tools and materials
5.2.1 Tweezers, clearer plate, brush, stopwatch, etc.
5.2.2 Water storage container: used for immersing specimens in water.
5.2.3 Water for laboratory use: Class-III water as defined in GB/T 6682 at a temperature of (20±2)℃.
5.2.4 Nonionic surfactant.
6 Genera principles for tests
6.1 Sampling
The sampling requirements are as follows:
——bulk laboratory samples shall be taken as needed, and the minimum volume shall not be less than 10g;
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Devices and materials
6 Genera principles for tests
7 Test steps
8 Calculation of results
9 Test report
Annex A (Informative) Pretension calculation method
Annex B (Normative) Calculation of statistical values and increased number of test fibres
Bibliography
