Introduction of various anti-static clothing
Anti-static clothing is specially developed in the anti-static industry to solve the problem of human body static electricity on various industries. It may be impossible to know in human life that our own body will be damaged by the static electricity generated by ourselves, because these static electricity do not affect the human body. There is a real hazard. This is not the case in other places. The static electricity generated in the human body is as high as tens of millions of volts. These static electricity will affect everything around us, so anti-static clothing has become necessary in some special places.
Of course, because the human body itself is a good conductor, the charging of clothing will cause the skin of the human body to be charged due to electrostatic induction, and a certain static voltage will also be formed. Therefore, for the operator, there are two possible discharge channels; one is the discharge between the fingertip (skin) and the grounding conductor, and the other is the discharge between the work clothes and the grounding conductor. Both of these discharges may cause damage to electrostatic sensitive devices. Although the anti-static wrist strap can eliminate the first discharge hazard, it cannot eliminate the first discharge hazard. This is because the wrist strap can only eliminate the static electricity on the human skin as a good conductor, and cannot leak the static electricity on the clothes with strong insulation. People often only pay attention to the elimination of static electricity on the human skin, but neglect or fail to pay enough attention to static electricity in anti-static clothing. This needs to be improved.
In normal production activities, between the clothing worn by the operator and the surface of the external medium (such as countertops, chair surfaces, tools, appliances, etc.), between layers of clothing, underwear and skin, until the soles of the shoes and the ground when walking Between the plateaus, clothing and shoes are charged due to frequent contact, separation and friction, especially when high-insulating chemical fiber clothing is worn. The electrostatic charge on the part of clothing and shoes gradually dissipates to the entire surface according to the law of charge dissipation on the medium, and when equilibrium is reached, a certain static voltage on the clothing is formed.
It should also be pointed out that it is generally believed that wearing pure cotton anti-static clothing can prevent the accumulation of static electricity in the clothing, so it is safe. Actually, this view is one-sided. This is basically the case only when the relative humidity of the air is higher than 50%; and when the relative humidity is relatively low, the charge of pure cotton products increases significantly. It can be seen that the static voltage value on clothing has greatly exceeded the electrostatic discharge damage threshold of many electrostatic sensitive devices when the human body is performing various activities. Therefore, it may cause damage to the sensitive devices when touching or approaching these components.
Tests have shown that when the relative humidity is lower than 30%, the charge of pure cotton fabric is equivalent to that of polyester; and when the relative humidity is lower than 20%, the charge of cotton fabric is even higher than that of some chemical fiber fabrics. Therefore, in dry climate areas, we cannot expect to use pure cotton products to eliminate the static electricity hazards of clothing under any circumstances.