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Your location: Home > Related Articles > What is the test method of leather folding resistance معدات اختبار

What is the test method of leather folding resistance معدات اختبار

Author: Released in:2022-12-15 Click:35

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For leather products, there is an important indicator, namely the folding resistance, as the folding resistance of leather products is not good enough, after wearing it for a long time, various problems may occur. Therefore, the folding resistance test must be performed before the leather products leave the factory. So, what is the method of the leather folding resistance test? Below, Shanghai Qianshi will bring you relevant introductions.

What is the method to test the folding resistance of leather? According to Shanghai Qianshi, in the process of wearing leather, under normal temperature and low temperature conditions, if there is no good folding resistance, there will be quality problems such as cracks (cracks or tears), which will affect the life of the leather. Therefore, it is necessary to test the folding resistance of leather.

Currently, the commonly used test methods are: the determination of the folding resistance ofroom temperature and the folding resistance at low temperature. Both methods simulate the bending effect on the leather material during the bending process by bending the sample at a certain frequency and amplitude, and both methods are suitable for testing various leather materials. After the test, visually observe and inspect with a magnifying glass in good light, and assess the folding resistance of the leather by observing the cracks and cracks (including cracks or cracks) on the surface of the leather material.

1. Determination of folding resistance at room temperature

(1) Reference standard: "QB/T2714-2005 Determination of leather physical and mechanical tests for folding resistance".

(2) Test instrument: learning flexibility tester

(3) Test principle: according to the test conditions ( 20 ± 2 °C, 65 ± 5%), according to the test requirements before the test, select the number of bends. After the test, stop the testing machine, get the sampleunfold, fold the sample inverted along its longitudinal axis, check and record any damage to the bent part to assess the folding resistance of the leather.

The upper test surface of the sample is folded and clamped in a movable armature, the lower test surface is folded out and clamped in a fixed armature, and the upper moving armature drives the sample, inspecting the defects caused by the sample.

(4) Testing method: fold the test surface of the leather sample inwards, put the two long sides together, clamp the folded sample and let it stretch vertically Insert the holder . The bending angle of the holder is (22.5 ± 0.5) °, the bending frequency is (100 ± 5) times/min, and automatically stops after the experiment is completed according to the preset bending times.

2. Determination of folding resistance at low temperature

(1) Reference Standard: "QB/T2714-2005 LeatherPhysical and Mechanical Tests for Determination of Folding Fastness of Leather".

(2) Test equipment: low temperature vertical testing machine

(3) Test principle: according to the low temperature test conditions, select according to the test requirements before the start of the test, the number of bends. After the test, stop the testing machine, take out the sample, fold the sample inversely along the longitudinal axis, check and record any damage to the bent part to judge the folding resistance of the leather.

The upper test surface of the sample is folded and clamped in a movable armature, the lower test surface is folded out and clamped in a fixed armature, and the upper moving armature drives the sample, inspecting the defects caused by the sample.

(4) Test method: fold the test surface of the leather msample inward, join the two long sides, clamp the folded sample and allow it to stretch vertically Insert the holder. The bending angle of the holder is (22.5 ± 0.5) °, the bending frequency is (100 ± 5) times/min, and automatically stops after the experiment is completed according to the preset bending times.

What is the method to test the folding resistance of leather? Shanghai Qianshi tells everyone that, in fact, at low temperatures, whether raw natural leather or thin and soft substitute leather such as PU leather, the folding resistance of relatively soft leather will decrease as the temperature changes. Both are better. Conversely, even if the coated leather is natural leather, because the fiber bundles of the grain layer are thinner and more fragile than the mesh layer, the grain layer tends to lose weight with repeated bending as the temperature decreases. Cracks appear first and the bonding speed between the coating film and the leather bodyit will also be weakened under repeated bending, so there is more chance of cracking. In short, in the low temperature environment, the influence of temperature on natural leather is not great, but the coated film leather is affected by the low temperature environment, and the material is prone to brittle cracking, resulting in different degrees of cracking. In the actual test, the quality of the sample material is also one of the important factors influencing the test results.

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