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GB/T 6505-2017 (GBT6505-2017)

GB/T 6505-2017_English: PDF (GBT 6505-2017, GBT6505-2017)
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GB/T 6505-2017English305 Add to Cart 0--9 seconds. Auto-delivery Man-made fiber -- Test method for thermal shrinkage of filament yarns (after treatment) Valid GB/T 6505-2017

BASIC DATA
Standard ID GB/T 6505-2017 (GB/T6505-2017)
Description (Translated English) Man-made fiber -- Test method for thermal shrinkage of filament yarns (after treatment)
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard W50
Classification of International Standard 59.060.20
Word Count Estimation 22,215
Date of Issue 2017-12-29
Date of Implementation 2018-07-01
Older Standard (superseded by this standard) GB/T 6505-2008
Drafting Organization Sheng Hong Technology Co., Ltd. Jiangsu
Administrative Organization China Textile Industry Federation
Regulation (derived from) National Standards Bulletin 2017 No. 32
Proposing organization China Textile Industry Federation
Issuing agency(ies) People's Republic of China General Administration of Quality Supervision, Inspection and Quarantine, China National Standardization Administration

Standards related to: GB/T 6505-2017

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
twisting. Loosely hang it on the filament-stranding rack without any tension.
7.1.1.2.4 In the standard atmosphere specified in 6.2.2, the test specimen shall be
equilibrated before thermal treatment for the time specified in 6.2.5.
7.1.1.3 Length measurement before boiling treatment
7.1.1.3.1 Manual measurement
Successively hang the test specimens on the hooks of the vertical measuring scale as
described in 5.3 a); align the inner side of the stranded filament with the zero point of
the vertical measuring scale. In accordance with the stipulations of 6.4.1, calculate the
tension. In addition, in accordance with this tension, on the lower end of the stranded
filament, carefully hang the weight with the hook as described in 5.3 b); prevent twisting
of the stranded filament. After (30 ± 3) s, the upper end of the outer circle of the hook
at eye level and the scale of the vertical measuring scale at the same level is the length
L0 of the test specimen before the treatment, accurate to 1 mm.
7.1.1.3.2 Measurement with an instrument
On the filament-stranding rack, add a 2.5 cN weight to the lower end of each test
specimen, so that the filament is vertically downward. Then, put it into the instrument.
In accordance with the stipulations of 6.4.1, set the pre-tension. After the instrument
automatically loads for (30 ± 3) s, read the length L0 of the test specimen before the
treatment, accurate to 0.1 mm.
7.1.1.4 Boiling treatment
7.1.1.4.1 Vertically place the filament-stranding rack (with specimen hanging) into the
boiling water; make it completely immersed. The boiling time shall be implemented as
specified in 6.2.3.2. During the entire test stage, it shall be ensured that the water is in
the boiling state.
the filament, carefully apply the weight with clamp specified in 5.3 b). After (30 ± 3) s,
make two marks on the test specimen at a distance of (500 ± 10) mm. The difference
value between the mark at eye level and the scale of the vertical measuring scale at
the same level is the length L0 of the test specimen before the treatment, accurate to 1
mm.
7.1.2.3 Boiling treatment
7.1.2.3.1 Fold the test specimen in half, and then, in half; put it in the mesh bag in a
loose state.
7.1.2.3.2 In accordance with the requirements of 6.2.3.1 and 6.2.3.2, conduct boiling
treatment.
7.1.2.3.3 Carefully take out the test specimen from the mesh bag; fold it in half and
hang it on the filament-stranding rack. In accordance with the drying conditions in
6.2.3.3, dry the test specimen in a tension-free and loose state.
7.1.2.3.4 Place the test specimen in the standard atmosphere specified in 6.2.2. In
accordance with the time specified in 6.2.5, conduct equilibrium after thermal treatment.
7.1.2.4 Length measurement after boiling treatment
Successively clamp the test specimens in the clamp on the upper end of the vertical
measuring scale as described in 5.3 a). In accordance with the stipulations of 6.4.2, on
the lower end of the filament, carefully apply the weight with clamp specified in 5.3 b).
After (30 ± 3) s, the difference value between the mark at eye level and the scale of
the vertical measuring scale at the same level is the length Ls of the test specimen after
the treatment, accurate to 1 mm.
7.2 Hot Air Shrinkage Rate (inapplicable to cellulose filament)
7.2.1 Stranded filament method (inapplicable to spandex)
7.2.1.1 Stipulations of test
For stranded filament test, the length may be measured manually or with an instrument;
the rest of the steps are the same.
7.2.1.2 Preparation and treatment of test specimen
Same as 7.1.1.2.
7.2.1.3 Length measurement before thermal treatment
Same as 7.1.1.3.
7.2.1.4 Thermal treatment
S---thermal shrinkage rate (boiling water shrinkage or dry shrinkage);
L0---length of test specimen before thermal treatment, expressed in (mm);
Ls---length of test specimen after thermal treatment, expressed in (mm).
8.2 The average value of each reel is the thermal shrinkage value of the current reel,
rounded off to one decimal place. The total average value of all reels is the thermal
shrinkage value of the current batch of sample, rounded off to one decimal place.
8.3 If necessary, the manufacturer shall determine the allowance of thermal shrinkage
rate of a batch of products.
8.4 The coefficient of variation needs to be calculated in accordance with the
stipulations of Appendix D.
9 Precision of Test Result
See Appendix F.
10 Test Report
Test report shall include:
a) Name, specification and number of reels of the sample;
b) Number identification of package being selected as batch sample;
c) The used test method and all test parameters;
d) The various performance test results of laboratory samples. If the standard
deviation and coefficient of variation are calculated, they shall be written into
the report;
e) Reminders on the modification of test procedures after negotiation and other
parts that are inconsistent with this Standard;
f) Observed abnormalities;
g) Test personnel; date of test.
...