GB/T 14344-2022 English PDF (GBT14344-2022)

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GB/T 14344-2022: Man-made fibre -- Test method for tensile properties of filament yarns
GB/T 14344-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.060.20
CCS W 50
Replacing GB/T 14344-2008
Man-made Fiber - Test Method for Tensile Properties of
Filament Yarns
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 ... 6
2 Normative References ... 6
3 Terms and Definitions ... 6
4 Principle ... 8
5 Devices and Materials ... 8
6 General Rules of Test ... 10
7 Test Procedures ... 13
8 Result Calculation ... 15
9 Test Report ... 19
Appendix A (informative) Recommended Values of Twist Applied to Filament ... 20
Appendix B (normative) Quick Humidity-conditioning Method ... 21
Appendix C (informative) Calculation Method for Pre-tension ... 22
Appendix D (normative) Calculation Method for Increased Number of Tests ... 23
Appendix E (normative) Calculation of Statistical Values ... 25
Bibliography ... 27
Man-made Fiber - Test Method for Tensile Properties of
Filament Yarns
1 Scope
This document describes the test method for the tensile properties of man-made fiber ---
filament yarns.
This document is applicable to man-made fiber --- filament yarns, excluding spandex and
carbon 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 6502 Sampling Method of Man-made Filament Yarns
GB/T 6503 Man-made Fibers - Test Method of Moisture Regain
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 9994 Conventional Moisture Regains of Textile Materials
GB/T 14343 Testing Method for Linear Density of Man-made Filament Yarns
3 Terms and Definitions
The terms and definitions defined in GB/T 4146 (all parts) , and the following terms and
definitions are applicable to this document.
3.1 gauge length
Gauge length refers to the total fiber length measured when the clamping points of the first
clamp holder and the second clamp holder are at the initial position.
[source: GB/T 4146.3-2011, 2.1.6, modified]
Example: the schematic diagram of the clamping point of a cable-pillar-type clamp holder is shown
[source: GB/T 4146.3-2011, 2.5.28]
3.5 initial modulus
Initial modulus refers to the ratio of stress increment to strain increment of the initial straight
line portion on a stress - strain curve of the fiber.
[source: GB/T 4146.3-2011, 2.5.29, modified]
3.6 work of rupture
Work of rupture refers to the work done by an external force when the fiber is stretched to
rupture. That is, the energy absorbed in the process of the fiber being stressed, until it ruptures.
3.7 breaking roughness
Breaking roughness refers to the work done by an external force when a fiber of unit linear
density and unit length is stretched to break.
4 Principle
Under the specified conditions, stretch the fiber to rupture on a constant-rate elongation tester,
and obtain data of tensile properties, such as: breaking force, breaking elongation, constant
force elongation, constant elongation force, initial modulus, work of rupture and breaking
toughness of the specimens from the tensile curve or data acquisition system.
5 Devices and Materials
5.1 Constant-rate Elongation Tensile Tester (CRE)
5.1.1 The instrument shall be equipped with the following devices:
a) Manual or automatic specimen loading device;
b) Electronic force measuring device;
c) Automatic recorder capable of drawing tensile curves or data acquisition system;
d) Clamp holder capable of holding fibers at a specified gauge length of at least 250 mm;
e) Device for changing different stretching speeds.
5.1.2 The instrument shall comply with the following technical requirements:
a) The maximum allowable difference between the actual force and the indicated force is
less than 1% of the actual force;
5.2.3 Rotary creel: used for telescopic cylinders, so that the specimen is easy to unwind along
the tangent line under low tension without changing the twist.
5.2.4 Water storage container: used to immerse the specimen in water.
5.2.5 Laboratory water: comply with Grade-3 water of GB/T 6682, at a temperature of (20  2)
C.
5.2.6 Nonionic surfactants.
6 General Rules of Test
6.1 Sampling
6.1.1 Laboratory sample drawing
Laboratory samples are drawn in the following modes:
---For the laboratory samples of bulk items, take out as needed;
---For the laboratory samples from batch samples, conduct the sampling in accordance
with the stipulations of GB/T 6502.
Packages that are accidentally damp, damaged or opened during transportation shall not be
taken as samples.
6.1.2 Specimen preparation
6.1.2.1 From each package, remove at least 100 m of surface filament.
6.1.2.2 For unsupported packages, a skein length measuring instrument can be used to make
strands with a length of at least 25 m; or on a telescopic cylinder, shake-take at least 25 m of
filament.
6.1.2.3 For untwisted and non-network filaments, if it is impossible to prevent the specimen
from slipping or the jaws from breaking, it can be twisted, so that the monofilaments in the
multifilament can be subject to a certain tension, and the optimal test results can be obtained.
The recommended values of twist applied to various filaments are shown in Appendix A.
NOTE: proper twist increases the breaking force; excessively large / small twist reduces the
breaking force. After twisting, the breaking elongation increases; the initial modulus
decreases.
6.1.2.4 For specimens of the wet-state test, no humidity-conditioning is required.
Add laboratory water at a temperature of (20  2) C to the water storage container and add a
non-ionic surfactant with a maximum concentration of not more than 0.1% in the water.
Take a section of specimen (more than 60 cm in length) and clamp both ends to prevent twist
loss. Put it on the water surface of the water storage container; try to let the fiber freely sink
and completely submerge in the water; soak it for 2 min. Throughout the operation, the loss of
twist and unintentional stretching of the specimen shall be avoided.
It shall be noted that the process from taking the specimen out of the water to stretching to
rupture shall not exceed 2 min.
The laboratory water in the water storage container shall be replaced at least once a week.
6.2 Humidity-conditioning and Pre-conditioning --- Applicable to Wet-state Test
6.2.1 Standard atmosphere for humidity-conditioning and testing
For filaments with a conventional moisture regain of less than 4.5%, the temperature is (20 
2) C, and the relative humidity is (65  5)%.
For filaments with a conventional moisture regain of greater than or equal to 4.5%, the
temperature is (20  2) C, and the relative humidity is (65  3)%.
The conventional moisture regain shall comply with the stipulations of GB/T 9994.
6.2.2 Humidity-conditioning time
6.2.2.1 Silk strands, telescopic cylinders and twisted specimens
When necessary, perform pre-conditioning. Under the condition that th...