The necessity of wearing anti-static work clothes
The generation and harm of static electricity: During normal production activities, operators wear work clothes and external media surfaces (such as work surfaces, chair surfaces, tools, appliances, etc.), between layers of clothing, and between underwear and skin. Even when walking, clothing and shoes will be charged due to frequent contact, separation and friction between the soles and the floor. Especially when wearing chemical fiber clothing with high insulation properties, the electrification will be aggravated. The local electrostatic charge on clothing and shoes gradually disperses to the entire surface according to the charge dissipation law on the medium. When equilibrium is reached, a certain electrostatic voltage is formed on the clothing. Of course, since the human body itself is a good conductor, the charging of clothing will cause the human skin to be charged due to electrostatic induction, which will also form a certain electrostatic voltage. So for the operator, there are two possible discharge channels; one is the discharge between the fingertips (skin) and the ground conductor, and the other is the discharge between the work clothes and the ground conductor. Both types of discharges may cause damage to electrostatically sensitive devices. Although the anti-static wrist strap can eliminate the first discharge hazard, it cannot eliminate the second discharge hazard. This is because the wristband can only eliminate static electricity on human skin, which is a good conductor, but cannot leak static electricity on clothing with strong insulation. People often only pay attention to eliminating static electricity on human skin, but ignore or do not pay enough attention to eliminating static electricity on clothing, which needs improvement.
It should also be noted that it is generally believed that wearing pure cotton can prevent the accumulation of static electricity in clothing and is therefore safe. In fact, this view is one-sided. This is basically the case only when the relative humidity of the air is higher than 50%; when the relative humidity is relatively low, the charge of pure cotton products increases significantly. Tests have shown that when the relative humidity is below 30%, the charge capacity of pure cotton fabrics is equivalent to that of polyester; when the relative humidity is below 20%, the charge capacity of cotton fabrics is even higher than that of some chemical fiber fabrics. Therefore, in areas with dry climates, we cannot expect to use pure cotton products to eliminate static electricity hazards from clothing under any circumstances. In order to ensure production safety and eliminate hidden dangers, workers should wear anti-static work clothes to eliminate static electricity caused by various reasons, especially in petroleum, chemical industry, mines, electronics, military industry, aerospace, navigation, ports, textiles, rubber, Special attention should be paid to places such as medicine and purification where static electricity hazards exist and are prone to fire and explosion hazards.