Common problems and solutions in hydrostatic test

In the process of fabric hydrostatic pressure testing, if the operation is not correct or the value of the test endpoint is not handled properly, it will cause test error, so it is important to learn to deal with the common problems in the test process.
Problems that are prone to occur during testing
During hydrostatic testing, improper handling will affect the test results.
1 Before clamping the sample, confirm that there is no air between the sample and the water, and then clamp the sample for testing. During the test, if there is air between the sample and the water, the water will not fully contact the designated test area, and there will be a part of the sample area without water droplets, which will affect the test results.
2 During the test, try to ensure that the sample edge of the fixture does not leak. If the sample leaks at the edge of the jig, water will seep from the edge of the jig during the test, and the test pressure will rise erratically, so that the accuracy of the test result cannot be guaranteed, thus affecting the test result.
Determination of trial endpoints
In the testing and evaluation of the water penetration resistance of textiles (hydrostatic pressure test method), when the third water drop appears, it is recorded in the sample, and the end point of the test is the third water drop. If the end point of the test is not selected correctly, it will directly affect the reading of the experimental result, and eventually lead to the error of the test value.
Here are some exceptions.
1 If a third water droplet appears on the edge of the holding device and the hydrostatic pressure value of the third water droplet is lower than the lowest level of the other normal samples, the data should be excluded and another sample should be added until the normal experimental results are obtained. . In general, the edges of the specimen are prone to damage due to the pressure of the clamping device, and the edges of the water droplets ooze out during the test. In this case, the test results should be analyzed to see if the test value is below the lowest value of other normal samples and if additional samples are required.
2 The standard notes stipulate that during the test, if the fabric is broken, the water column splashes or the composite fabric is bulged by injection, the pressure value at this time is recorded, and the test phenomenon is explained in the report. If the above situations occur, the test should be regarded as the end of the test.
How to handle the above exception?
If the dispersion coefficient of the hydrostatic pressure test results is large, such as the average value of the test results is qualified, and the single value of the single test is unqualified, it is recommended to judge whether it is qualified, and the report shows that the single value of the single test is unqualified.
If the back of the sample had been wetted with water prior to testing, the test result was recorded as 0 and the report indicated that the sample had been wetted after contact with water.
The water-resistant permeation processing technology of textiles is in a stage of rapid development. With the growth of the market demand for waterproof special finishing textiles and the improvement of product technical indicators, the anti-hydrostatic pressure performance of textiles has been paid more and more attention. . In the future, the research and development of waterproof fabric products will mainly be carried out from the changes in the type and structure of polymer materials.
Publicado en Technology en junio 03 at 10:53
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