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GB/T 19390-2014 English PDF (GBT19390-2014)

GB/T 19390-2014 English PDF (GBT19390-2014)

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GB/T 19390-2014: Dipped polyester cord fabric for tyres

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.
GB/T 19390-2014
GB
NATIONAL STANDARD OF THE
PEOPLE 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 according to GB/T 8170. 7.4.1.7 Precautions
Operators shall not touch the heating chamber with their hands and shall not leave the instrument that has clamped the specimen.
7.4.2 Hot oven test method
7.4.2.1 Principle
Place the specimen that has been conditioned and balanced in hot air at a specified temperature for a specified time under a certain tension. Test the gauge length change of the specimen before and after the test. Calculate the heat shrinkage of the specimen. 7.4.2.2 Test instruments
Constant temperature oven: the heating capacity reaches 200??C, and the temperature control accuracy is ??2??C. The net height in the oven shall be able to put the ruler and frame. Fix one end of the cord specimen whose gauge length is not less than 250 mm on the frame. The other end of the specimen hangs a weight for applying pretension. Rulers and frames.
7.4.2.3 Number of specimens
5 pieces.
7.4.2.4 Test conditions
Temperature: (177??2)???. Heat treatment time: 2 min.
7.4.2.5 Operating procedures
Put 5 specimens on the scale frame. The upper end of the specimen is fixed at the zero scale position of the scale. Apply the pretension specified in Table 6 to each specimen. Make a mark at the lower end of each specimen, Make the gauge length of the specimen not less than 250 mm. Record the initial length of each specimen. Put the ruler frame into the oven. Carry out the test under the specified test conditions. At the end of the test, read the length of each specimen after the test in the hot state and record it. 7.4.2.6 Calculation
Use formula (5) to calculate the hot air thermal shrinkage of each specimen. Calculate the arithmetic mean to express the hot air thermal shrinkage of each batch of cords. The value of the calculation result shall be rounded to one digit after the decimal point according to GB/T 8170.
Where,
7.5.4.1 Adjust the position of the movable fixture of the twist testing machine so that the distance between the two fixtures is (250??1) mm.
7.5.4.2 Clamp one end of a specimen that has been conditioned and balanced into a movable fixture. Apply pretension to the specimen according to the provisions in Table 6. Put the other end of the specimen through the fixed fixture. Pull the specimen so that the twist extension and twist shrinkage dials make the pointer point to zero. 7.5.4.3 Set the untwisting direction, untwisting machine speed and other conditional parameters on the controller of the testing machine. Set the display value of the untwisting number display to zero. Start the testing machine and start untwisting. After the retwisting is exhausted, stop the testing machine and record the number of retwisting twists. Convert to 1 m twist numbers.
7.5.4.4 Cut off one or two strands of the initial twisted yarn from the above-mentioned specimens that have been fully untwisted, so that only one initial twisted yarn remains. According to the linear density of the initial twisted yarn, adjust the pretension according to Table 6. Pull the initial twisted yarn so that the pointer of the twist extension and twist shrinkage dial is facing the zero position. Reset untwisting direction. Set the display value of the untwisting number display to zero. Start the testing machine and start to untwist. After the initial twist is exhausted, stop the testing machine and record the number of initial twists. Convert to 1 m twist numbers.
7.5.4.5 Repeat the above operation for each specimen.
7.5.5 Calculation
Take the arithmetic mean of the initial twist and retwist numbers of 10 specimens to represent the initial and retwist twists of each batch of cord fabrics. The unit is T/m. Values are rounded to integers according to GB/T 8170.
7.6 Fineness test
7.6.1 Diameter test
7.6.1.1 Test instruments
Thickness gauge. Its technical indicators:
a) Measuring range: 0~10 mm. The minimum division value is 0.01 mm.
b) Upper platen: the diameter is (9.5??0.1) mm; the pressure on cord is (167??3) cN; the drop height is 6.5 mm.
7.6.1.2 Number of specimens
10 pieces.
7.6.1.3 Operating procedures
Calibrate the thickness gauge so that the pointer points to zero. Place the specimen flat on the thickness gauge chassis. The pressure plate drops slowly from a height of about 6.5 mm from the chassis. Read and record the value after the pressure plate touches the specimen until the pointer stops, to the nearest of 0.01 mm. Each specimen shall be tested once at two positions rotated to a difference of 90?? along the axial direction of the cord at the same test site.
7.6.1.4 Calculation
The diameter of each batch of cord is represented by the arithmetic mean of the test results, in mm. The resulting value shall be rounded to two digits after the decimal point according to GB/T 8170.
7.6.2 Linear density test
7.6.2.1 Test instruments
Balance: the minimum graduation value is 1 mg.
Meter ruler.
7.6.2.2 Number of specimens
Five sets. Each set is with a total length of at least 5 m.
7.6.2.3 Operating procedures
Take a sufficient number of specimens that have been subjected to humidity conditioning treatment according to the requirements of 7.6.2.2. Measure the length of each specimen one by one under the pretension specified in Table 6. Calculate the total length of each set of specimens. The length of a single specimen is accurate to 0.001 m. Put it in an oven with a temperature of (105??3)??C. Dry it to a constant weight. That is, take out the weighing bottle from the oven every 30 min. Cap the ...

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