Analysis of test method for waterproofness of shoe material leather

The waterproof performance of shoe materials is mainly reflected in the waterproof performance of upper leather materials, and the waterproofness of shoe materials and leather is also an important indicator of the quality standard of shoe materials. Since leather and textiles are the main components of the upper surface, the following will introduce the test methods for the waterproof performance of these two types of materials. There are 3 test methods for leather waterproof performance, Bally waterproof (soft leather waterproof) test method, heavy leather waterproof test method and Maeser waterproof test method. The domestic standards for waterproof and heavy leather waterproofing include GB/T 22890-2008 and GB/T 22891-2008. Both of these two standards are modified to adopt ISO standards. GB/T 22890-2008 is modified to adopt ISO 5403:2002. /T 22891-2008 is a modification to adopt ISO 5404:2002. Maeser waterproofing is US standard ASTM D 2099 and ISO 5403-2:2011. 1. Maeser waterproof test method The current test standards are American standard ASTMD 2099 and ISO5403-2:2011. The method is to install the test sample on the Maeser leather dynamic waterproof testing machine, immerse it in water, and observe the water seepage after the tortuous test. This method is suitable for the test of general shoe upper leather. During the test, it is also necessary to clamp the sample to prevent water from infiltrating through the crack. 2. Bally waterproof test method (soft leather waterproof) The current test standards are GB/T22890-2008 and ISO5403-1:2011. Before the test, the sample was formed into a groove shape and installed on the fixture, so that the sample collided with the water surface in a state of continuous folds, and the waterproofness of the leather in this similar wearing state was observed, and the water permeability time, water absorption rate and water permeability were measured. , which characterizes the dynamic water repellency of leather. This method is suitable for testing the soft leather of shoe upper, and testing the hardness of the leather at the same time to select the appropriate amplitude. Prior to testing, the surface of the specimen was roughened to remove the coating. When testing, pay attention to clamping the sample to prevent water from infiltrating the gap and affecting the test result. 3. Heavy leather waterproof test method The current test standards are GB/T22891-2008 and ISO 5404:2011. The surface of the sample is continuously wetted under the condition of deflection and compression (such as the way shoe soles are compressed when walking). According to the thickness of the heavy leather, different action times are set to obtain various indicators for evaluating the water resistance of the heavy leather. The results can be characterized by the absorption rate and permeability. The absorption rate is the moisture content absorbed by the sample during the test (the weight of the sample after the test - the weight of the sample before the test = the increased moisture content in the sample), and the permeability is the rate at which moisture penetrates the leather. In this method, the surface of the sample is roughened to remove the coating before the test, and one end of the sample needs to be fixed on the roller during the test. The three test methods have different principles and are suitable for the waterproof performance testing of different types of leather. The Bally waterproof test method is suitable for shoe upper leather, clothing leather, etc., the heavy leather test method is suitable for sole leather, insole, etc., and the Maeser waterproof method is suitable for general upper leather. At present, Bally waterproof method and Maeser waterproof method are widely used in testing institutions and enterprise laboratories. More about Leather Testing Equipment: http://www.standard-groups.com/LeatherShoes/

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