GB/T 19390-2014 English PDF (GB/T19390-2014)

GB/T 19390-2014: Dipped polyester cord fabric for tyres
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GB/T 19390-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.100.99
G 41
Replacing GB/T 19390-2003
Dipped polyester cord fabric for tyres
ISSUED ON: DECEMBER 05, 2014
IMPLEMENTED ON: OCTOBER 01, 2015
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 Product classification and specifications ... 6
5 Technical requirements ... 7
6 Test conditions, regulations on product batching and specimen preparation methods
... 10
7 Test methods for physical and chemical properties ... 11
8 Inspection methods for tissue specifications and appearance quality ... 23
9 Inspection rules ... 24
10 Packaging, marking, quality guarantee, transportation and storage ... 24
Annex A (Informative) Tensile performance test method -- CRT tensile testing machine
method ... 27
Dipped polyester cord fabric for tyres
1 Scope
This Standard specifies the requirements such as terms and definitions, product
classification and specifications, technical requirements, test conditions, regulations on
product batching and specimen preparation methods, test methods for physical and
chemical properties, tissue specifications and appearance quality inspection methods,
commercial settlement quality and inspection rules as well as packaging, marking,
quality guarantee, transportation and storage FOR dipped polyester cord fabric for tyres.
This Standard applies to the identification and acceptance of the quality of dipped
polyester cord fabric for tyres.
2 Normative references
The following referenced documents are indispensable for the application 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 2942-2009, Rubber, vulcanized - Determination of static adhesion to textile
cord - H-pull test
GB/T 3291 (all parts), Textiles - Terms of textile material properties and test
GB/T 4666-2009, Textiles - Fabrics - Determination of width and length
GB/T 4668-1995, Textiles - Woven fabrics - Determination of number of threads per
unit length
GB/T 6529-2008, Textiles - Standard atmospheres for conditioning and testing
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 14343-2008, Testing method for linear density of man-made filament yarns
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 3291 (all
parts) as well as the followings apply.
3.1 H-test adhesive strength
The force required to pull the cord from the H-shaped rubber-cord test piece in the
direction perpendicular to the rubber block per unit length, expressed by N/cm.
3.2 dip pick-up
The dipping component of the dipped cord is separated from the white cord by chemical
method and dried to a constant weight. The ratio of the constant mass of the
impregnated substance to the constant mass of the blank cord shall be the dip pick-up,
expressed by %.
3.3 elongation at specified load
The strain of the cord under a given load, expressed by %.
3.4 hot air thermal shrinkage
The ratio of the length reduction of the cord due to the action of hot and dry air at a
certain temperature to the original length, expressed by %.
3.5 warp density within specified width from each edge
The number of warp threads within a certain length from both sides of the cord fabric
to the cloth edge, expressed by root/10 cm.
3.6 net weight on scales of cord fabric just leave dipping unit
The net mass of dipped cord fabric obtained by deducting the mass of all packaging
materials from the mass of the cord fabric roll when leaving the dipping machine.
3.7 dimensional stability index
The sum of elongation at specified load and hot air thermal shrinkage, expressed by %.
3.8 linear density of the dipped cord
The absolute dry mass of a certain length of dipped cord, expressed by g/100 m.
4 Product classification and specifications
4.1 Dipped polyester cord fabric is divided into ordinary type and dimensionally stable
type (high modulus, low shrinkage) according to physical and chemical properties
(mainly dimensional stability).
4.2 Dipped polyester cord fabric is divided into 5 specifications: 1100 dtex/2, 1440
dtex/2, 1670 dtex/2, 2200 dtex/2, 2500 dtex/2 according to warp thread density and
number of strands.
goods. However, if they are produced by different processes or are not continuously
dipped, they shall be divided into separate batches according to the same production
process or each continuous dip.
6.2.2 For each batch of cord fabric, a test fabric with a length of 1 m shall be woven at
the end of a roll of cord fabric as a laboratory sample. Between the test cloth and the
product cloth, it shall weave a length of about 10 cm dense weft segment with the same
weave structure as the cloth head. Cut the test cloth from the cloth roll after dipping.
Extract an appropriate number of cords. Immediately test the moisture regain when off
the machine. Cut the remaining test cloth in half along the center line and quickly put
it into a black plastic bag. Send it to the laboratory for the post-conditioning test. The
other half will be sent to the buyer for testing along with the product. If the supplier and
the buyer agree, batching and sampling can be carried out according to the methods
agreed by both parties.
6.2.3 At 20 cm from the edge of the test cloth, evenly extract cords with a length of 500
mm ~ 600 mm from the six positions equidistant from each other. Remove the weft and
blend as the specimen of this batch of cord fabrics. Take out a sufficient number of
specimens for the tests of adhesive strength, diameter and adhesion rate, etc. The rest
of the specimen shall be hung on the specimen rack for humidity conditioning. After
they are balanced, they shall be used for the tests of tensile properties, twist, linear
density and hot air thermal shrinkage. Specimens shall be randomly selected, but cords
with serious defects shall be removed.
6.2.4 In the event of disputes between the supplier and the buyer over the test results,
the test results jointly accepted by randomly selected specimens shall prevail.
7 Test methods for physical and chemical properties
7.1 Tensile property test
7.1.1 Principle
Under the specified conditions, clamp the cord specimen between the two clamps of
the CRE electronic tensile testing machine. Stretch the specimen to fracture at the
specified tensile speed. Determine the breaking strength, constant load elongation and
breaking elongation of the specimen directly from the strength-elongation curve or data
display. Calculate and obtain the elongation at specified load, elongation at break,
coefficient of variation of breaking strength and coefficient of variation of elongation
at break of the specimen. For tensile testing machines equipped with data processing
and printing devices, the test values of various tensile properties can be automatically
printed out after the test is completed by setting the test program.
7.1.2 Test instruments
This Standard recommends using CRE tensile testing machine. See Annex A when
using a CRT tensile testing machine. In case of any dispute over the tensile test results,
the test results of the CRE tensile testing machine shall prevail.
CRE electronic tensile testing machine shall meet the following technical requirements:
- It is equipped with drawing device or data processing and printing device.
- The error of the tension display value is no more than ±0.5% of the full scale load.
- The error of the elongation display value is not more than ±1% of the elongation
record value.
- There are different tensile strength ranges, so that the breaking strength of the
specimen is in the range of 20%~90% of a certain range.
- It is equipped with pneumatic clamps that can compensate the pressure of the
specimen. The jaws of pneumatic grips shall be flat, unlined steel. The pressure of
the jaws shall ensure that the specimen does not slip in the jaws, nor can it damage
the specimen and cause it to break at the jaws.
7.1.3 Number of specimens
20 pieces.
7.1.4 Test conditions
Gauge distance: (250±1) mm.
Tensile speed: (300±5) mm/min.
7.1.5 Operating procedures
7.1.5.1 Correct the grip distance and tensile speed of the tensile testing machine so that
they meet the requirements specified in 7.1.4.
7.1.5.2 Adjust the tensile force and elongation display device of the tensile testing
machine so that the tensile force and elongation display values of the tensile testing
machine are all zero when the tensile testing machine is in a non-working steady state.
7.1.5.3 For the tensile testing machine equipped with a recorder, adjust the position of
the recording pen so that the recording pen is facing the baseline of the recording paper
when the tensile machine is in a non-working stable state.
7.1.5.4 Select appropriate tensile force range according to the specimen specification.
Set the content of the data required to be printed.
7.1.5.5 Remove one specimen from the specimen rack in 6.2.3. One end is fixed in a
movable clamp. Put the other end into the fixing clamp. Clamp the specimen after
applying pretension to the specimen according to the provisions in Table 6.
Because the mixed solvent in 7.3.4.1 can only dissolve polyester fiber, but not rubber
compound, separate the dipped film on the dipped cord with a measured constant mass
from the blank cord. Measure the constant mass of the dipped film. The ratio of the
constant mass to the constant mass of the blank cord shall be the dip pick-up of the
dipped cord.
7.3.2 Test instruments and solvents
Constant temperature oven with temperature control accuracy of ±3°C.
Analytical balance with a minimum division value of 0.1 mg.
Weighing bottle.
G2 sand core funnel.
Medium speed qualitative filter paper.
Magnetic stirrer, magnetic bar.
Suction filter or vacuum pump, suction filter bottle.
250 mL beaker, watch glass (diameter larger than the diameter of the beaker), scissors,
etc.
Chemically pure dichloromethane (CH2Cl2), trichloroacetic acid (CCl3COOH).
7.3.3 Number of specimens
Two portions. Each portion is about 2 g.
7.3.4 Operating procedures
7.3.4.1 Dissolve 300 g of trichloroacetic acid in 1000 mL of dichloromethane to become
the solvent for polyester fiber.
7.3.4.2 Cut the specimen cord into pieces with a length of about 2 mm ~ 3 mm.
Respectively put into two weighing bottles. The mass of the specimen pieces in each
weighing bottle is about 2 g. Put the two weighing bottles into an oven at a temperature
of (105±3)°C and dry them to constant weight. That is, take out the weighing bottle
from the oven at intervals of 30 min and put it in the desiccator immediately after
closing the cap tightly. Weigh after the temperature drops to room temperature. Until
the mass loss of two adjacent weighings is less than 0.1 mg, it is considered that the
constant weight has been reached.
7.3.4.3 Pour the specimen fragments in the weighing bottle into two beakers,
respectively. Immediately weigh the mass of the weighing bottle. The difference
between this mass and the mass of the weighing bottle and the fragmented specimen
shall be the mass of the specimen. Add approximately 75 mL of polyester fiber solvent
specified temperature for a certain period of time under a specified tension. While the
specimen is still under heat and tension, the hot air thermal shrinkage of the specimen
can be read directly from the scale or display of the instrument. For the thermal
shrinkers equipped with data collection, processing and printing devices, test conditions
can be set at the beginning of the test. At the end of the test, the instrument can
automatically print out the thermal shrinkage of the specimen.
7.4.1.2 Test instruments
The heat shrinker consists of a specimen heating chamber with a heating capacity up to
250°C, a temperature control accuracy of ±2°C, and a length of not less than 250 mm,
a specimen fixture, and an automatic test, calculation, and result output display or
printing device. The test and display accuracy of hot air thermal shrinkage of the
specimen shall reach 0.1%. The instrument shall have an automatic timing function or
be equipped with a timer.
7.4.1.3 Number of specimens
5 pieces.
7.4.1.4 Test conditions
Temperature: (177±2)℃. Heat treatment time: 2 min.
7.4.1.5 Operating procedures
Set the test conditions first. After that, use a specimen fixture to clamp firmly one end
of the specimen that has been conditioned and balanced. After the other end passes
through the guide pulley, fasten the counterweight weight, so as to apply the pretension
specified in Table 6 to the specimen and prevent the specimen from untwisting. Push
the specimen frame into the heating chamber. Simultaneously start the test program.
After the test is finished, the test results are automatically printed out. If the instrument
is not equipped with automatic timing and printing device, the specimen frame shall be
pushed into the heating chamber. Simultaneously start the timer. When the specified
test time is reached, read and record the test result from the test result display.
Repeat the above operation for each specimen.
7.4.1.6 Calculation
Read the arithmetic mean value of the hot air thermal shrinkage of 5 specimens by
reading from the average value key. Use it to represent the hot air thermal shrinkage of
each batch of cords. If the instrument does not have the function of automatically
calculating the arithmetic mean value of a set of data, calculate the arithmetic mean of
the hot air thermal shrinkage of 5 specimens. The value of the calculation result shall
be rounded to one digit after the decimal point accord...