How do I check the accuracy and reproducibility of Martindale test results?

To fully and accurately express the abrasion resistance of textiles, the test requires good accuracy and repeatability. This article discusses the factors influencing the Martindale test results from three aspects: instrument maintenance, sample preparation and operating specifications, to improve the accurate habit of using the measurement results.

1. Maintenance of the Martindale Instrument
The condition of the instrument determines the reliability of the test results. To ensure the accuracy of the test, it is necessary to ensure that the test instrument is in the best condition. In addition to daily cleaning and maintenance, regular instrument performance inspections are required.
1. Control of the pressure exerted by the clamping head of the sample
When using Martindale to carry out the wear resistance test, it is necessary to apply a certain pressure to the sample, and the pressure will didirectly affect the friction effect. If the pressure is too small, the friction will be too light, and the test result will be better than the actual performance of the sample; on the contrary, if the pressure is too high, the damage to the sample will be exacerbated and the test result will be biased.
2. Accuracy of the number of friction counters
When Martindale is used for the wear resistance test, the number of frictions should be counted according to the wear conditions caused by different times of friction. If the number of friction counters fail at this time, it will affect the number of frictions in the test and cause errors.

Second, the preparation of the sample
The selection of the sample in the test determines the representativeness of the sample.
1. Selection of samples
To ensure the representativeness of the samples, it is necessary to select parts that contain different warp and weft yarns.s, and special attention should be paid to some monsters with special properties. For example, the selected swatch of printed fabric should contain the whole pattern to avoid missing some parts that are sensitive to friction; the woven fabric should keep a certain distance from the edge of the door width. In addition, the number of samples selected also affects the accuracy and repeatability of the test. The larger the number of samples tested, the stronger the representativeness and the higher the accuracy. On the contrary, if the number is too small, the randomness of the test results will be greater and the reliability will be low. The minimum number of samples chosen is 3.
2. Pre-treatment of the sample
Because the fabric is packed and wound up before it is sent to the test, it is in a tensioned state. For a better test, it should be placed in a standard state for one every testto restore the fabric from its tight state. If the pre-treatment is not present, the fabric will be under tension and the wear resistance will deteriorate, which will affect the accuracy of the test.

3. The standardization of the experimental operation
To ensure the correct operation, it is necessary to train the experimental operators. During the operation, pay attention to the placement of the sample and the clamping tightness. It shall not be too tight to cause additional stretching, nor too loose, so that the surface of the sample is too loose and bulging, which will affect the test results.

More about the Martindale Abrasion Tester: http://www.abrasiontesters.com/productlist/list-5-1. html

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