GB/T 14344-2008 English PDF (GBT14344-2008)

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GB/T 14344-2008: Testing method for tensile of man-made filament yarns
GB/T 14344-2008
ICS 59.060.01
W 50
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Testing method for tensile of
man-made filament yarns
(BISFA-2004, Testing methods for polyester filament yarns,
BISFA-2004, Testing methods for polyamide filament yarns,
BISFA-1997, Testing methods for viscose, copro, acetate, triacetate
and lyocell filament yarns, NEQ)
ISSUED ON. JUNE 18, 2008
IMPLEMENTED ON. MARCH 01, 2009
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China
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 ... 6
5 Devices and materials ... 6
6 General rules of test ... 7
7 Test procedures ... 10
8 Result calculation ... 14
9 Tolerances ... 16
10 Test report... 17
Annex A (Informative) Method of rapid humidity ... 18
Annex B (Informative) Calculation method of pre-tension ... 19
Annex C (Normative) Statistics. Terms and calculation ... 20
Foreword
The consistent degree of tensile density in this Standard is not equivalent to that in
BISFA-2004 Polyester Filament Yarn Test Methods, BISFA-2004 Nylon Filament Yarn
Test Methods, and BlSFA-1997 Viscose, copper ammonium, Acetate, Triacetate, Lyocell
Filament Yarn Test Methods.
This Standard shall replace GB/T 14344-2003 Synthetic Fiber Filament Tensile
Performance Test Methods.
Compared with GB/T 14344-2003, the major changes of this Standard are as follows.
----- The scope of application is modified. it is expanded from synthetic fiber filament to
cellulose fiber filament (See Chapter 1);
----- Rounding off for calculation results is modified (8.1, 8.9 in the 2003 edition; 8.8 in this
edition);
----- Humidity condition, standard atmospheric conditions for test and the time are
modified (Chapter 6 in the 2003 edition; 6.2 in this edition);
----- Requirements on sampling of bulk items are added (see 6.1.1);
----- The pre-tension load calculation is added (see 6.3.1);
----- The part of statistics in the original standard is adjusted to be Annex C in this
Standard.
Annex C of this Standard is normative, while Annex A and Annex B are informative.
This Standard was proposed by China Textile Industry Association.
This Standard shall be under the jurisdiction of Shanghai Textile Industry Technical
Supervision Institute.
This Standard was drafted by organizations. 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 Tiane Chemical Fiber Co., Ltd., Xinxiang Chemical Fiber Co., Ltd.
The main drafters of this Standard are. Ding Jianzhong, Lu Xiuqin, Zhang Yushi, Cheng
Qian, Chen Jieling, Liu Chufeng, Lei Ming.
The previous versions replaced by this Standard are as follows.
----- GB/T 14344-1993 and GB/T 14344-2003.
Testing method for tensile of
man-made filament yarns
1 Scope
This Standard specifies the method for testing tensile performance of chemical filaments,
such as polyester (terylene), polyamide (nylon), polypropylene (PP) filament and cellulosic
fiber.
This Standard applies to chemical filaments (pre-oriented yarn, drawn yarn, textured yarn
and so on). This Standard can be used as reference for the chemical filament extracted
from textile.
This Standard does not apply to the filament, of which the elongation percentage is larger
than 0.5% when the tension is increased from 0.05cN/dtex to 0.1cN/dtex.
2 Normative references
The articles contained in the following documents have become this Standard when they
are quoted herein. For the dated documents so quoted, all the modifications (excluding
corrections) or revisions made thereafter shall not be applicable to this Standard. For the
undated documents so quoted, the latest editions shall be applicable to this Standard.
GB/T 3291.1 Textiles--Terms of textile material properties and test--Part 1. Fibre and yarn
GB/T 3291.3 Textiles--Terms of textile material properties and test--Part 3. General
GB/T 6502 Sampling method of man-made filament yarns
GB/T 6529 Textiles—Standard atmospheres for condition and testing
GB/T 8170 Rules of rounding off for numerical values and expression and judgment of
limiting values
GB/T 14343 Testing method for linear density of man-made filament yarns
3 Terms and definitions
For the purpose of this Standard, the following terms and definitions given in GB/T 3291.1
and GB/T 3291.3 shall apply to this Standard.
4 Principle
Under prescribed conditions, ELONGATE fiber on the CRE tester until it is fractured, then
OBTAIN testing value of sample fracture strength, fracture elongation, constant load
elongation, load at constant elongation, initial modulus, rupture work and other tensile
performance according to strength-elongation curve or data display or data acquisition
system.
5 Devices and materials
5.1 CRE tester, the sample can be loaded by manual control or automatic loading device.
The instrument shall be equipped with the following devices.
a) Electronic measuring devices.
b) The automatic recorder or data acquisition system that can draws strength-elongation
curve. Data acquisition speed of data acquisition system shall be high enough to meet the
requirement that the maximum allowable difference between actual and indicating
strength shall be less than 1% of the actual strength and the maximum allowable
difference between real and indicating elongation shall be less than 0.5mm.
c) Gripper. Gripper shall meet the following requirements.
1) The gripper can grip sample F within the specified gauge length;
2) At least 250mm gauge length setting shall be achieved by the gripper;
3) The speed variation shall be less than 4% when the movable gripper moves at a
constant speed;
4) During the continuous test, maximum allowable difference for the movable gripper to
return to different initial positions shall be less than 0.25 mm;
5) The gripper shall be able to strip the sample, with no slip and no sample fracture at
the holding point due to sample damage.
Note 1. The typical jaw of gripper shall be flat and without liner; but if it can't prevent the slip of the
sample, other forms of gripper can be adopted according to the agreement, for example, the gripper with
liner or cable-pillar-type gripper.
Note 2. As the type of gripper will have certain effect on fracture elongation rate of sample, the related
laboratory samples according to the C.3. CALCULATE standard deviation of
arithmetic mean of each group of single values TO the total arithmetic mean of
each laboratory samples according to C.5. The confidence region of total
arithmetic mean can be calculated by that standard deviation, at here the n is
the number of laboratory samples to be tested.
C.8 Redetermination of test number
SAMPLE laboratory samples according to requirements of GB/T 6502. If they
failed to achieve the required confidence region, it is necessary to increase the
number of tests. If it has already done n times of test, COMPUTE the standard
deviation s or coefficient of variation CVb. If it exceeds the specified confidence
region, in order to reach the required half-width value of the confidence region
c* or C*, the number of tests shall be increased m...