HG 3048-1987 Determination of flexural wear of rubber-coated fabrics HG3048-1987 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Rubber coated fabrics - Determination of flex abrasion
Rubber coated fabrics - Determination of flex abrasion This standard is equivalent to the international standard IS05981.1982 "Rubber or plastic coated fabrics - Determination of flex abrasion 1 Scope of application
UDC678.4.06
620.173/174
GB7536
Determination of flex abrasion\.
This standard specifies the evaluation method of the comprehensive performance of shear, scratch, flexure and abrasion resistance of rubber coated fabrics, but is not applicable to products with adhesive on the surface layer 1.
2 Principle
The friction machine makes the sample produce continuous changes in bending and withstand slight friction. After a certain period of time (or friction times), the damage of the sample is observed with the naked eye.
3 Testing machine
The testing machine consists of a friction machine and a pressure rod. The friction machine has two parallel clamps, which can alternately perform counter-rotating and isotropic reciprocating motions on the plane of their main dimensions. The pressure rod should press the extreme bending part of the sample to make it contact with the bottom plate (see Figure 1, Figure 2). The testing machine should be equipped with a counter and a device to align the two clamps. 3.1" Dimensions and characteristics of the friction machine
The distance between the clamps is 12 ± 0.3 mm.
b. The distance d between the upper surface of the lower clamp and the bottom plate is 6 ± 0.1 mm; it can also be 3 ± 0.1 mm (limited to thin-layer coated fabrics) according to the agreement between the supplier and the buyer.
The total stroke of the two clamps is 40 ± 1 mm.
The movement frequency is 2.25 + 0.5 Hz (each time the center line of the clamp is passed, it is counted as one friction). Note: Most counters have a problem with the transmission method. Only one reciprocating motion of the clamp is counted as two frictions. In this case, the number shown on the counter should be multiplied by 2 The square is the number of frictions.
The length of the pressure bar is 100±1mm and the width is 10±0.2mm. f
The load applied by the pressure bar is 5±0.1N. All surfaces of parts in contact with the specimen (except the clamping surface of the fixture) should be polished with a surface roughness of "3.2 Fixture
The fixture consists of an upper and a lower clamping plate (see Figures 1 and 2). 3.2.1 The lower clamping plate (A) has a shoulder (P) for positioning the specimen, so that the short side of the specimen is 27.5°mm away from its edge, and the area of ​​the flexure friction part of the specimen is 45mm×50mm. The lower clamping plate should also have two reference marks (G) that can align the center line of the specimen with the common symmetry axis of the fixture when the fixture is buckled. Instructions for use:
1) IS0 59811982 stipulates that the pressure bar can be removed for this case for testing. Approved by the Ministry of Chemical Industry of the People's Republic of China on March 13, 1987 and implemented on December 1, 1987
GB 7536-87
3.2.2 The upper plate (B) is used to hold down the specimen. In order to avoid cutting the specimen, the edges of the upper and lower plates should be chamfered with a radius of curvature of 1±0.1mm.
and the lower clamping plate should ensure that the specimen cannot slide during the test. 33 Compression rod
The center of the pressure rod should be aligned with the center of the two clamps and the bottom plate (see Figures 2 and 3) so that the pressure rod and the clamp cannot touch. The edge of the pressure rod should be chamfered with a radius of curvature of 1±0.1mm. The center of gravity of the rod () and the center of gravity of the pressure rod guide system should be on a plane perpendicular to the clamping surface of the specimen. When the clamps are buckled, this plane passes through the common symmetry axis of the two clamps. The guide system of the pressure rod should allow the pressure rod to move vertically and rotate around the center of gravity (G), but the center of gravity of the system should always be on the plane specified above. The load applied to the friction part by the pressure rod is 5+0.1N. According to the agreement between the supplier and the buyer, a load of 10±0.2N can also be applied. 12.0.3 Figure 2 Equipment top view
P plate west - reference mark
w+1+ 9-
Figure 2 Equipment agent view
4 Test sample
4.1 Shape and size of the test sample
GR 7536
Figure 3 Pressure rod
I—vertical displacement; 2—center of rotation, one sub-rod system, T—pressure rod·www.bzxz.net
4.1.1 The test piece is rectangular, with a length of 100=0.25mm and a width of 50=0.25mm (as shown in Figure 4), 4h (05)
100±0.25 (1=n.23)
Figure Sample
One fire is the area of ​​the test burning part, one marking line 4.1.2 If the test piece specified in 4.1.1 cannot be tested, especially the rubber-coated fabric with poor elongation and easy to tear in the tool, a sample with a length of 110±0.25mm and a width of 50±0.25mm can also be used (the area of ​​the flexure friction part of the sample is 55mm×50mm), but it must be reported in the report Note. 4.2 Sample preparation
1.2.1 The sample should be prepared as follows:
Sample prepared in the warp direction: 100mm (warp) × 50mm (weft) a.
5. Sample prepared in the weft direction: 10mm (linear) × 50mm (warp). 4.2.2 When cutting the sample, the edge of the sample should be at least 100mm away from the edge of the coated part and at least 1m away from the end of the entire roll of rubber-coated fabric. The sample should not have any defects. Number of samples
GB 7536-87
For each test of single-sided rubber coated fabric, 6 specimens shall be prepared, including 3 in the warp direction and 3 in the weft direction. In general, 2 specimens shall be taken in each direction for testing. When the test result is abnormal, the third specimen shall be tested. If it is a double-sided rubber coated fabric, both sides shall be tested, and 6 specimens shall be prepared in the warp and weft directions respectively. 5 Time interval from manufacturing to testing
5.1 The time interval between the manufacturing and testing of the specimen shall be no less than 16h. 5.2 For non-product testing, the time interval between the manufacturing and testing of the specimen shall be no longer than 4 weeks, and the arbitration test shall be carried out after the same time interval as far as possible.
5.3 For product testing, the time interval between the production and testing of the specimen shall not exceed 3 months. In special cases, the test shall be completed within 2 months from the date when the user receives the goods.
6 Standard environment for specimen storage and testing
The standard environment for specimen storage and testing shall comply with the provisions of GB7539-87 "Standard environment for parking and testing of rubber coated fabrics 2.1 Environment A".
If it cannot be parked and tested in a standard push environment, it must be noted in the report. 7 Test steps
7.1 Draw two marking lines on the specimen (as shown in Figure 4). The marking lines should be parallel to the short side of the specimen and 27.5mm from the edge. 7.2 Snap the clamps together and fix the specimen between the two clamps so that the coated surface of the specimen faces the differential pressure rod and the marking lines are aligned with the edge of the clamp. 7.3 Place the pressure rod on the upper part of the specimen, add E load, and start the testing machine. 7.4 The test can be interrupted at any time and the specimen can be checked visually for damage. 7.5 The test continues until the predetermined number of frictions is completed or until obvious damage is found. When the specimen is close to damage, the observation time interval should be shortened as much as possible,
Result expression
Check and determine the damage of the specimen or compare the specimen with the control specimen. 9 Test report
The test report shall include the following contents: the name or code of the test specimen;
the number of specimens;
the length of the specimen:
the direction of each specimen (warp or weft): the test surface of the double-sided rubber-coated fabric:
the test and storage environment;
the frequency and load used;
the distance between the upper surface of the lower tool and the bottom plate; the damage of the specimen and the number of frictions;
other issues that need to be explained (such as: pretreatment medium, temperature and time, etc.). Additional explanation:
GB 753687
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China and is under the jurisdiction of the National Technical Committee for Standardization of Rubber and Rubber Products. This standard was drafted by the Shenyang Rubber Industry Products Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Lin Weizhen.
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