This standard specifies the test principle, test instrument, test specimen, test procedure and test report of leather impact resistance under certain conditions. This standard is applicable to all leather with thickness greater than 0.5 mm. QB/T 1810-1993 Leather impact resistance test method QB/T1810-1993 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Leather Impact Resistance Test Method
1 Subject Content and Scope of Application
QB/T1810—1993bzxz.net
This standard specifies the test principle, test instrument, sample, test procedure and test report of leather impact resistance under certain conditions. This standard applies to all leathers with a thickness greater than 0.5 mm. 2 Reference Standards
GB/T4689.1 Sample Location and Marking in Leather Test Room GB/T4689.2 Air Conditioning of Test Pieces for Leather Physical Properties Test 3 Test Principle
Use swing to make the impact hammer rub the flat leather sample once, put the sample with surface damage caused by rubbing into the observation box, and compare it with the standard sample to determine the impact resistance of the sample. 4 Instruments
4.1 Impact Tester: Its components meet the following requirements. a. Impact pendulum: suspended on a steel shaft with a diameter of 12.7mm and a length of 110mm. The steel shaft is installed on a firm bracket. The steel shaft and the bracket are supported by balls. The impact pendulum can swing freely. The mass of the impact pendulum (including the impact hammer) is (1000±100)g. b. Impact hammer: made of cylindrical tool steel, with a diameter of 12.7mm, an impact surface chamfer of 135, and a distance of (238±1)mm between the impact surface and the axis of the steel shaft.
Micrometer: can measure the vertical displacement of the sample table. Its scale can be directly read to 0.05mm, and the estimated reading is c.
0.005mm.
4.2 Observation box.
4.3 Standard impact sample.
4.4 Gap gauge: thickness 0.5mm.
5 Sample preparation
5.1 Sample size: 125mm×25mm, sample the outside of the cracked sample in the sampling position according to GB/T4689.1, the long side of the sample is parallel to the back line of the sample, and the side close to the head should be marked. 5.2 The sample is adjusted according to GB/T4689.2. 6 Test steps
6.1 When the impact pendulum is hanging freely, place the gap gauge between the sample table and the impact hammer, raise the sample table so that the impact hammer, gap gauge and sample table are in contact, and then record the reading r1 on the micrometer. Lower the sample table to the lowest position and remove the gap gauge. 6.2 Swing the impact pendulum to one end and clamp it with a fixing clamp. 6.3 Fix the end of the sample with the head and neck mark on the sample table, with the use surface facing up, and stretch the sample flatly on the sample table until the other end is clamped by an iron clamp, one end of the iron clamp is connected to a pulley with a line, and a 50N weight is hung on the pulley to tighten the sample (a 25N weight is used for pig and sheep clothing leather).
6.4 Let the impact stand hang freely, and gradually raise the sample table until the sample contacts the impact hammer. Be careful not to apply pressure. If the impact hammer is in full contact with the specimen table, record the micrometer reading r2. Generally, due to the uneven surface or uneven thickness of the specimen, only part of the specimen is in contact with the impact hammer at the beginning. At this time, slowly raise the specimen table until half of the specimen area is in contact with the impact hammer, then stop raising the specimen table and record the micrometer reading r2. 6.5 Lower the specimen table so that the impact pendulum is at a 75° angle to the vertical plane and clamp it with a fixing clamp. Use the micrometer to raise the specimen to the following height: that is, when the impact pendulum falls, the impact hammer can penetrate three-tenths of the specimen thickness. Clamp the specimen table with the positioning screw. The micrometer reading should be r2+0.3(ri+0.5—r2), r2
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