This standard specifies the test method for the wear resistance of leather. This standard is applicable to all kinds of leather with wear resistance requirements. QB/T 2726-2005 Physical and mechanical tests of leather - Determination of wear resistance QB/T2726-2005 Standard download decompression password: www.bzxz.net

ICS59.140
Classification number: Y45
Registration number: 15778-2005
Light Industry Standard of the People's Republic of China
QB/T2726-2005
Physical and mechanical tests
Determination of abrasion resistance
Leather --- Physical and mechanical tests.Determination of abrasion resistancePublished on March 19, 2005
National Development and Reform Commission of the People's Republic of ChinaImplemented on September 1, 2005
QB/T2726-2005
This standard is modified to adopt the International Union of Leather Technologists and Chemists (IULTCS) standard IUP48 "Measurement of abrasion resistance of automotive leather" automotive leather), which has been converted into ISO/NP17076:2004 "Leather-Physical and mechanical tests-Determination of abrasion resistance of automotive leather" by the International Organization for Standardization (ISO). According to the actual situation in my country, this standard has made the following technical modifications when adopting the IUP48 standard: the word "automobile" has been deleted from the name and scope of the standard to expand the scope of application of the standard; the original IUP standard cited in the "normative reference document" has been rewritten as a reference to the relevant standards of my country: - the explanatory "note" in 3 principles has been deleted; - the explanatory description in 4.6 has been changed to the content of "note"; - to prevent incorrect understanding of the standard in use, the reference "note" in 5.2 of the original standard has been deleted; for ease of use, the commonly used test revolutions have been added in 6.2.4; and the reference Appendix A (instrument source) has been deleted. This standard has also been edited as follows: the foreword of the IUP standard has been deleted; the term "this IULTCS standard" has been changed to "this standard"; the decimal point "," has been replaced by the decimal point ",". This standard was proposed by the China Light Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Leather Industry (SAC/TC252). The drafting units of this standard are: Zhejiang Kasen Industrial Co., Ltd. and China Leather and Footwear Industry Research Institute. The main drafters of this standard are: Zhou Xiaosong, Xu Huaihai, Zhu Miaofeng, Shi Jie. This standard is published for the first time.
1 Scope
Physical and mechanical tests on leather
Determination of wear resistance
This standard specifies the test method for the wear resistance of leather. This standard is applicable to all kinds of leather with wear resistance requirements. 2 Normative references
QB/T 2726—2005
The clauses in the following documents become the clauses of this standard through reference in this standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions apply to this standard. GB250-1995 Grey scale for evaluating color change (idt ISO105/A02) QB/T2706 Sampling sites for chemical, physical, mechanical and color fastness tests on leather QB/T2707 Preparation and adjustment of specimens for physical and mechanical tests on leather 3 Principle
The specimen to be tested is placed on a horizontal platform and rotated. Two grinding wheels are given a specific pressure to press on the test piece and rotate. The axes of the grinding wheels are parallel to the horizontal plane, one grinding wheel faces outward and the other faces inward. All changes in the test piece are recorded within a certain period of time. 4 Device
4.1 Sample platform, horizontal rotation, rotation speed (60 ± 5) r/min. 4.2 Sample holder, flat, round, detachable. 4.3 Support arms, two, with grinding wheels, the inner edge of the grinding wheel is (26.20 ± 0.25) mm from the axis of the specimen platform, each grinding wheel applies a force of (250 ± 10) g to the test specimen. :
4.4 Vacuum suction nozzle, located above the surface of the test specimen. 4.5 Counter, indicating the number of rotations of the specimen platform. 4.6 Grinding wheel, tungsten-carbon wheel or rubber wheel, width (12.7 ± 0.1) mm, maximum diameter 51.7 mm, minimum diameter 44.0 mm. The diameter of the grinding wheel should be consistent during the test and should be recorded in the test report. Note: The grinding wheel will gradually consume during use. The maximum diameter of a new wheel is 51.7 mm. Used grinding wheels should be discontinued when the diameter is less than 44.0 mm. 4.7 Loading, the force exerted by the grinding wheel on the specimen is: 250g (without weight block), (500±10)g (with weight block) or (1000±20)g (with weight block).
4.8 Specimen fixing sheet, minimum thickness 1.0mm, for bonding when necessary to maintain the hardness and flatness of the specimen 4.9 Dust suction device, with a suitable interface to connect the vacuum nozzle (4.4). 4.10 Sandpaper, silicon carbon type, E150 grade.
4.11 Soft brush, or compressed air.
4.12 Brush, hard bristle brush.
4.13 Grey sample card, in accordance with the provisions of GB250-1995. QB/T 2726-2005
5 Sampling and preparation of test specimens
5.1 Sampling
Perform as specified in QB/T2706.
5.2 Preparation of test specimens
Cut 3 circular test specimens with a diameter of (106±1) mm and a suitable hole in the center. If necessary, fix them with the test specimen fixing sheet (4.8).
5.3 Air conditioning of test specimens:
Perform as specified in QB/T2707.
6 Procedure
6.1 Preparation of new grinding wheel
6.1.1 Prepare a new rubber grinding wheel according to 6.1.2 to 6.1.8. Prepare a new tungsten-carbon grinding wheel according to 6.1.9. Mount the rubber grinding wheel on the support arm (4.3) with the label side facing outwards. 6.1.2
Increase the weight (4.7) so that the weight on each grinding wheel is 1000 g. 6.1.3
6.1.4 Select the appropriate sandpaper (4.10) and place it on the specimen holder. 6.1.5 Place the grinding wheel on the surface of the sandpaper, turn on the dust suction device, start the machine, and run it for 20 revolutions. 6.1.6 Replace the sandpaper and repeat the operation in 6.1.5. Check the grinding wheel. If the color is not consistent, reprocess it with new sandpaper. If the color is still not consistent, discard the grinding wheel. 6.1.7
6.1.8 Remove the debris with a soft brush or compressed air (4.11). 6.1.9 Use a hard brush (4.12) to brush off the surface attachment and prepare a new tungsten-carbon grinding wheel. 6.2 Friction test specimen
6.2.1 Install the prepared new grinding wheel (6.1) or the adjusted grinding wheel (6.3) on the support arm (4.3) in the correct position with the label facing outward. 6.2.2 Select the appropriate load (4.7): 250g, 500g or 1000g. Note: The commonly used load is 500g, but the vehicle manufacturer may specify the load. The load used should be recorded in the test report. 6.2.3 Install the specimen in the specimen holder. 6.2.4 Place the grinding wheel on the surface of the specimen, turn on the dust suction device, start the machine and operate it at the set speed. The following speeds can be selected: 100, 250, 500, 1000, 2500, 5000. 6.2.5 Stop the machine, remove the specimen, measure and record the damage of the specimen, and exclude the damage within 2mm of the edge of the test area and the area of ​​the specimen squeezed by the start and stop of the machine. If necessary, measure the color change in the test area using a gray scale. 6.2.6 Replace the specimen and repeat 6.2.5 and proceed to the next test. 6.2.7www.bzxz.net
Repeat 6.2.6 and test at the number of revolutions specified in 6.2.4. 6.3 Adjustment of grinding wheels
6.3.1 Adjust the rubber grinding wheel as specified in 63.2 to 6.3.7. Adjust the tungsten-carbon grinding wheel as specified in 6.3.8. 6.3.2 Adjust the rubber grinding wheel after each test. 6.3.3 Add weights as specified in 4.7. so that the weight on the grinding wheel is 1000 g. 6.3.4 Place the sandpaper (4.10) on the specimen holder. Place the grinding wheel on the surface of the sandpaper, turn on the dust collection device, start the machine, and run for 20 revolutions. 6.3.5
Brush away debris with a soft brush (4.11).
Each sandpaper can be run for a maximum of 60 revolutions and must be replaced. 6.3.7
Use a hard brush (4.12) Brush off the attachments on the tungsten-carbon grinding wheel and use sandpaper (4.10) to remove the burrs on the edge of the grinding wheel. 6.3.8
Test report
The test report should include the following:
This standard number:
Sample name, number, type, manufacturer (or trademark); test conditions (temperature, humidity);
Grinding wheel type, test load;
Test revolutions;
Any damage to the sample;
Color change of the sample after comparison with the gray sample card; Abnormal phenomena during the test;
Differences between the actual measurement method and this standard; Test personnel and date.
QB/T2726—2005
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