The role of anti-static overalls
The anti-static work uniform refers to a uniform that is sewn with an anti-static fabric as a fabric in order to prevent static electricity from accumulating on the garment.
The antistatic fabric is a fabric obtained by mixing conductive fibers or antistatic synthetic fibers or a mixture of the two at substantially equal intervals or evenly during weaving. The conductive fiber is a general term for fibers made of a conductive material or a subconductive material using metal or organic materials in whole or in part, and has a volume resistivity ρv ∼ of between 104 ∼ 109 Ω/cm. According to the distribution of the conductive component in the fiber, the conductive fiber can be classified into three types: a conductive component uniform type, a conductive component covering type, and a conductive component composite type. At present, most of the anti-static fabrics are made of conductive fibers, especially the conductive component composite type, that is, the composite fiber is used most.
An antistatic work uniform made of conductive fibers is added to the chemical fiber fabric, and the power dissipation is based on two mechanisms of charge leakage and neutralization. When grounded, the static electricity on the fabric is neutralized by the corona discharge of the conductive fibers, and can also be discharged to the ground via the conductive fibers; when not grounded, the electricity is dissipated by the weak corona discharge of the conductive fibers.
Practice has shown that anti-static work uniforms can effectively suppress static electricity in clothing and eliminate or reduce the electrostatic discharge hazard. When the human body performs various activities, the static voltage value on the clothing 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. It should also be pointed out that it is generally believed that wearing a cotton work uniform can prevent static accumulation of clothing and is therefore safe. The actual view is one-sided, only when the relative humidity of the air is higher than 50%; and when the relative humidity is relatively low, the charged amount of the pure cotton product is significantly increased. 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. For the above reasons, in order to effectively prevent the electrostatic discharge hazard of the human body static electricity, the operator must wear an anti-static work uniform.