Testing antistatic fabrics
Today, Master Chen of the workshop is going to test a new batch of anti-static fabrics, but since the ESD technical engineers are not there, I will help test it.
I used a portable surface resistance tester. I first laid the new anti-static fabric (stripes) on a relatively flat insulation board, and then used the surface resistance tester's poles perpendicular to the stripes in the fabric. The test result was 105, and then it was washed several times. After drying, the test was still 105. In order to verify the accuracy of my test results, I also tested the problematic anti-static fabric swatches in the same way, testing no parameters, or sometimes parameters and parameters. I arbitrarily concluded that the new fabric is a qualified anti-static fabric.
In fact, during the testing process, I neglected a very important point. If the fabric is bleached by antistatic agent (liquid), it is easy to clean the antistatic agent (liquid) attached to the fabric. The test results may still show normal. Therefore, in order to prevent the fabric from being bleached by the antistatic agent (liquid), it must be tested in both vertical and parallel directions.
Vertical test: Test the two poles of the surface resistance tester perpendicular to the stripes in the fabric;
Parallel test: test the two poles of the surface resistance tester parallel to the stripes in the fabric;
If the qualified anti-static fabric should have static parameters in the vertical test, there is no static parameter in the parallel test. In the case of bleached antistatic fabrics, there are electrostatic parameters in both vertical and parallel tests.
In addition, it should be noted during the test that in order to prevent the anti-static fabric from being a wire-hopping product, the cloth should be multi-point tested.