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GB/T 6505-2017 English PDF (GBT6505-2017)

GB/T 6505-2017 English PDF (GBT6505-2017)

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GB/T 6505-2017: Man-made fiber -- Test method for thermal shrinkage of filament yarns (after treatment)
GB/T 6505-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.060.20
W 50
Replacing GB/T 6505-2008
Man-made Fiber - Test Method for Thermal Shrinkage
of Filament Yarns (after treatment)
[ISO 18066:2015, Textiles - Man-made Filament Yarns - Determination of
Shrinkage in Boiling Water, MOD;
ISO 18067:2015, Textiles - Synthetic Filament Yarns - Determination of
Shrinkage in Dry-hot Air (after treatment), MOD]
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: JULY 1, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
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 ... 11 
8 Result Calculation ... 15 
9 Precision of Test Result ... 16 
10 Test Report ... 16 
Appendix A (informative) Structural Changes of This Standard Compared with
ISO 18066:2015 and ISO 18067:2015 ... 17 
Appendix B (informative) Technical Differences of This Standard Compared
with ISO 18066:2015 and ISO 18067:2015 and the Causes for These
Differences ... 20 
Appendix C (informative) Method for Obtaining Tension per Unit Linear Density
... 22 
Appendix D (normative) Calculation Method for Increasing Test Quantity ... 23 
Appendix E (normative) Specimen Placing Method with Mesh Bag and Gauze
... 27 
Appendix F (informative) Precision of Result ... 28 
Man-made Fiber - Test Method for Thermal Shrinkage
of Filament Yarns (after treatment)
1 Scope
This Standard specifies test methods for boiling water shrinkage and dry-hot air
shrinkage of man-made filament yarns (after treatment) -- stranded filament method
and single filament method. The stranded filament method provides two modes:
manual measurement and instrument measurement; manual measurement shall be
used when there is a dispute.
This Standard is applicable to man-made fiber filament yarns with a linear density of
less than 3,000 dtex.
This Standard is inapplicable to pre-oriented yarns.
2 Normative References
The following documents are indispensable to the application of this document. 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 6682 Water for Analytical Laboratory Use - Specification and Test Methods (GB/T
6682-2008, ISO 3696:1987, MOD)
GB/T 9994 Conventional Moisture Regains of Textile Materials
GB/T 14343 Testing Method for Linear Density of Man-made Filament Yarns
FZ/T 50005 Testing Method for Linear Density of Spandex Filament Yarns
3 Terms and Definitions
The terms and definitions defined in GB/T 4146 (all parts) are applicable to this
document.
4 Principle
Under specified conditions, use thermal medium (boiling water or dry-hot air) to treat
the test specimen. Measure the length variation of the test specimen before and after
the treatment; calculate its percentage to the original length of the test specimen. Thus,
the thermal shrinkage rate can be obtained.
5 Devices and Materials
5.1 Filament yarn length measuring instrument, attached with:
a) A device that can adjust tension and a reciprocating filament-guiding device;
b) A device that can adjust the speed, so as to ensure that the tension fluctuation
is within the allowable range;
c) Yarn frame, with a circumference of (1.000 ± 0.002) m;
d) A reel counting device.
5.2 Filament-stranding rack: a cylindrical frame mechanism; multiple test specimens
can be placed at the same time.
Each test specimen has a 2.5 cN hook weight, with a height of at least 600 mm. There
is respectively a row of hooks at the upper and lower ends. During the test, the
stranded filament is hung between the upper and lower hooks. The upper hook is fixed;
the lower hook is the 2.5 cN hook weight, which frictionlessly lifts and lowers along the
metal wires on both sides.
5.3 Manual length measuring rack, attached with:
a) Vertical measuring scale: measuring range is 1 m; minimum division value is
1 mm. The upper end is equipped with clamps and hooks. The clamping
surface of the clamp is flat; it shall not damage the filament or slip during the
clamping. The hooks are made of steel wire with a diameter of 2 mm ~ 3 mm;
the upper end of the outer circle of the steel wire at the yarn hanging position
is parallel to the zero position of the measuring scale;
b) Device for applying pre-tension: the accuracy of applying pre-tension is ± 10%;
tension device is a combination weight with a hook or a combination weight
with a clamp.
5.4 Automatic length measuring instrument: it can automatically measure the length of
the stranded filament before and after thermal treatment; calculate the thermal
shrinkage rate and automatically adjust the tension. It is also equipped with a filament-
the upper limit of the laboratory’s relative humidity;
---When the temperature of the sample is 5 °C lower than the laboratory
temperature.
6.2.2 Standard atmosphere for conditioning and testing
For test specimens with a conventional moisture regain less than 4.5%: temperature
(20 ± 2) °C, relative humidity (65 ± 5) %.
For test specimens with a conventional moisture regain greater than or equal to 4.5%:
temperature (20 ± 2) °C, relative humidity (65 ± 3) %.
The conventional moisture regain of various fibers shall refer to GB/T 9994.
6.2.3 Conditions of boiling water treatment
6.2.3.1 Add Grade-3 water that complies with GB/T 6682 to the water tank. The amount
of water shall ensure that the test specimen is completely immersed and kept away
from the wall of the water tank.
6.2.3.2 The boiling time is (30 ± 5) min.
6.2.3.3 After boiling, the drying temperature is (55 ± 5) °C; the drying time is around 60
min.
NOTE: since the boiling point of water depends on the atmospheric pressure at the
measuring point, variation in atmospheric pressure may cause changes in the
result of the boiling water shrinkage.
6.2.4 Conditions of dry-hot air treatment
In accordance with different types of fibers, different hot air temperatures and thermal
treatment times shall be adopted. The recommended conditions of hot air temperature
and thermal treatment time are shown in Table 1. For filaments that are not applicable,
the hot air temperature and thermal treatment time may be determined through
negotiation.
When manual measurement is chosen, the test specimen may also be placed in a
mesh bag or be wrapped with gauze in accordance with Appendix E.
7.1.1.2 Preparation and treatment of test specimen
7.1.1.2.1 Withdraw the surface filaments from the reel. Insert the reel on a bobbin frame;
draw out the filament end.
7.1.1.2.2 Introduce the filament into the tension device, so as to fix the filament end on
the clamping piece of the yarn frame of the length measuring instrument. The coiling
tension shall be calculated in accordance with Formula (3). Evenly and smoothly wind
for the number of reels specified in 6.3.1, with knots at both ends.
7.1.1.2.3 Carefully remove the stranded filament from the yarn frame; prevent it from <...
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