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Test Method For Safety Shoe Soles
- Jul 24, 2017 -

Safety shoes during the entire service life of the footwear, due to the flexing of the foot to produce strain, or sharp edge incision notch and puncture the soles may wear cracking or fracture. Extreme temperatures (especially under 0 degrees) and contamination (e.g., oil) may also accelerate the cracking of the sole. Therefore, it is very important to test the scratch resistance of the sole, there are many kinds of test methods can be chosen, so it may be difficult to choose the correct method. The 3 main flex test methods, applications, and Satra provided for the rubber and plastic soles are described below.

Using Bennewart method
 Test safety Shoes Ross Flex test for smooth and small soles with little or no soles design, you can use the Ross Flex test machine (Satra TM60). Generally, 3 pieces of x25 mm size 150 mm are removed from the shoe, and the long edge is parallel to the heel seat. Cut a cut on the sample using a chisel with a 2 mm blade, then place the sample in a flex machine, so the incision is directly above the Flex Mandrel. Before and after testing the incision, you can calculate the increase of the incision. The test typically runs at a temperature of 5 ℃ for 150,000 cycles. This helps to create measurable incision increases within a reasonable time range. The only exception is the +20℃ test of thermoplastic rubber, as this material performs better at lower temperatures. The Satra Ross Flex Tester (STM 141) can hold up to 12 specimens at a time. The machine is flexing samples at a standard speed of 60 times per minute. However, it is possible to provide a 100-minute flex machine for the ASTM version of this test. In addition to the standard machine, it can provide lower and higher temperature equipment. This temperature ranges from the ambient temperature to the -20℃ and from the ambient temperature to the +40℃.

Satra Ross Flex Tester (STM $number) Bata band test
 If the soles contain large splints or complex designs that integrate different materials, the best way to test the Satra resistance is to bata the tester. This is a universally accepted test that can be repeated to produce results associated with actual wear. Glue the front part of the sole (minus the heel but still contain any cavity filler or midsole material) to the canvas strap. The part is driven by different diameters from the shaft, so when the belt is actuated to the mandrel, the sole is cycled repeatedly. The axis is generally 90 mm in diameter, but can be changed to 60 mm or 120 mm to increase or decrease the degree of deflection. Unlike the Ross Flex test, you don't have to cut the soles. The test runs 50,000 cycles and continues visual evaluation during operation. Record the length and depth of any crack. The test is generally performed at room temperature, but in Satra, the soles can be tested at the lowest -15℃ temperature. The Bata with Quiyi (STM 459) is equipped with a three-pin replaceable shaft of 60 mm, 90 mm and 120 mm, which is configured as a standard, with a rotational speed of up to 90 flex per minute on a smaller spindle. A lower-temperature version of the machine can also be provided to perform tests at low to -20℃ temperatures.

Bennewart Test
 As with the old standards, the new safety footwear standard (EN ISO 20,344:2004) requires the use of Bennewart machines to test the soles. More testers prefer to use the Bata Band test method to test the front of the sole. The insole is an important part of the sample, using a chisel similar to Ross to cut open the incision on the nominal flex curve. The soles are clamped at both ends, and the rollers push the inner bottom to flex the sole 90 degrees. Measure the increase of the incision after 30,000 cycles at room temperature. If necessary, this test can be performed at Satra below 0 degrees. This is a demanding test, best suited for durable footwear with sturdy soles. For casual, stylish and everyday footwear, the test is considered too restrictive, especially when the soles are thick. Satra's Rennewart sole flex tester (STM 465) is designed to ensure a balance of forces and therefore requires a smaller force to perform the test to make the results smoother. The clamp rigidity of the instrument is large, strictly according to standard operation. Suitable for a revised Bennewart tester, the use of spring action clips, not according to the standard for this test. However, a cryogenic version of the instrument can be provided to perform tests in a low to -20℃ temperature environment. The cutting fixture (STM 465) equipped with chisels can be provided to help accurately cut the soles.

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