GB/T 19390-2023 English PDF (GBT19390-2023)

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GB/T 19390-2023: Dipped polyester cord fabric for tyres
GB/T 19390-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.100.99
CCS G 41
Replacing GB/T 19390-2014
Dipped polyester cord fabric for tyres
ISSUED ON: MARCH 17, 2023
IMPLEMENTED ON: OCTOBER 01, 2023
Issued by: State Administration for Market Regulation;
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
... 11
7 Test methods for physical and chemical properties ... 12
8 Inspection methods for tissue specifications and appearance quality ... 25
9 Inspection rules ... 25
10 Packaging, marking, quality guarantee, transportation and storage ... 26
Annex A (informative) Tensile performance test method -- CRT tensile testing machine
method ... 29
Annex B (informative) Schematic diagram of pneumatic grips for tensile testing
machine ... 31
Dipped polyester cord fabric for tyres
1 Scope
This document specifies product classification and specifications, technical
requirements, test conditions, regulations on product batching and specimen
preparation methods, physical and chemical properties test methods, tissue
specifications and appearance quality inspection methods, inspection rules as well as
packaging, marking, quality guarantee, transportation and storage FOR dipped
polyester cord fabric for tyres.
This document is applicable 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.
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.
3.3 elongation at specified load
The strain of the cord under a given load.
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.
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.
3.6 net weight
The mass of dipped cord fabric obtained by subtracting 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.
3.8 linear density of the dipped cord
The absolute dry mass of a certain length of dipped cord.
4 Product classification and specifications
4.1 According to physical and chemical properties, dipped polyester cord fabrics are
divided into high-modulus low-shrinkage (HMLS), high-strength high-modulus low-
shrinkage (HTHMLS) and high-dimensionally-stable high-modulus low-shrinkage
(HDS-HMLS).
4.2 According to the warp linear density and the number of strands, the dipped polyester
cord fabric is divided into 1100dtex/2, 1440dtex/2, 1670dtex/2, 2200dtex/2, 2500dtex/2,
3340dtex/2, a total of 6 specifications.
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 dipped polyester cord fabric, a test cloth with a length of about
1 m shall be taken from a certain roll of dipped polyester cord fabric as a laboratory
sample. Extract the appropriate number of cords. Immediately test the off-machine
moisture regain. Cut the remaining test cloth in half along the center line. Quickly pack
it into a black plastic bag. Send it to the laboratory for testing after conditioning. The
other half is vacuum-packed and sent to the buyer with the product for testing. 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 From 20 cm away from the edge of the test cloth, uniformly extract cords with a
length of 500 mm ~ 600 mm from 6 positions equidistant from each other. Remove the
weft. After mixing, it is used as the specimen of this batch of dipped polyester cord
fabric. Take out a sufficient number of specimens for testing items such as adhesive
strength, diameter and dip pick-up. The remaining specimens are hung or placed on the
specimen rack to adjust the humidity. After balancing, they are used for testing items
such as tensile properties, twist, linear density of the dipped cord 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 document 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 th...