Anti-static overalls are developed in the anti-static industry to solve the static electricity of human body for various industries. It may not be possible in human life to know that our own body will be harmed by static electricity generated by ourselves, because these static electricity are not for the human body. There is a real danger. 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 is necessary in some special places.
Of course, since the human body itself is a good conductor, the charging of the clothing will cause the human skin to be charged around the body due to electrostatic induction, and a certain static voltage is also formed. Thus, for the operator, there are two possible discharge channels; one is the discharge between the fingertip (skin) and the ground conductor, and the other is the discharge between the work clothes and the ground conductor. Both of these discharges can cause damage to static-sensitive devices. Although the anti-static wristband eliminates the first type of discharge hazard, it does not eliminate the second discharge hazard. This is because the wristband can only eliminate static electricity on the human skin as a good conductor, and it is impossible to leak static electricity on the more insulative clothing. People often only notice the elimination of static electricity on human skin, and neglect or do not pay enough attention to antistatic static electricity, which needs improvement.
During the normal production activities, the operator wears clothing between the external media surface (such as work surface, chair, tools, appliances, etc.), between the layers of clothing, between the underwear and the skin, until the sole and the ground when walking Between the pings, clothing and shoes are charged due to frequent contact separation and friction, especially when wearing high-insulation chemical fiber clothing. The static charge of the clothing and shoes is gradually dispersed to the entire surface according to the law of the charge on the medium, and a certain static voltage is formed on the garment when the balance is reached.
It should also be pointed out that it is generally believed that wearing a cotton anti-static clothing can prevent static accumulation of clothing and is therefore safe, and the actual view is one-sided. This is basically the case when the relative humidity of the air is higher than 50%; and when the relative humidity is relatively low, the charge amount of the pure cotton product is significantly increased. It can be seen that the static voltage value of the clothing in the human body during various activities has greatly exceeded the electrostatic discharge damage threshold of many electrostatic sensitive devices, and the sensitive device may be damaged when touching or approaching these components.
Tests have shown that at a relative humidity of less than 30%, the charge of a cotton fabric is comparable to that of polyester; and when the relative humidity is less than 20%, the charge of a cotton fabric is even higher than that of some chemical fabrics. Therefore, in a dry climate, it is not expected to use any cotton products to eliminate the electrostatic hazard of clothing under any circumstances.
