The role of anti-static clothing in the process of preventing static electricity
Friction and static electricity are two major sources of harm in the electronics and microelectronics industries, but the generation of static electricity is not a hazard. The danger lies in the accumulation of static electricity and the resulting electrostatic charge discharge, so it must be controlled. Static electricity on equipment or humans can range from tens of thousands of volts to hundreds of thousands of volts, often ranging from hundreds to thousands of volts under normal operating conditions. The human body can carry thousands of volts or even tens of thousands of volts of static electricity due to the contact of its own actions with other objects - separation, friction or induction. In the production process of electronic products, the finished components and components are often in contact with and separated from equipment tools, and static electricity is generated. Antistatic seat cushions, turnover trolleys, maintenance kits, tools, work chairs (stools), etc. must be used. Static electricity is quickly vented by proper grounding. An electrostatically charged object forms an electrostatic field around it, which produces mechanical effects, discharge effects, and electrostatic induction effects. Due to the mechanical effect of static electricity, the floating dust particles in the air will be adsorbed to electronic components such as silicon wafers, which seriously affect the quality of electronic products. Therefore, anti-static measures must be taken for purifying the working space.
Anti-static clothing is used to prevent the static electricity from accumulating in clothes. It is sewn with anti-static special fabric as the fabric. It is suitable for wearing in places with large static electricity generated by static sensitive industries, fire or explosion hazards. Static electricity is the result of a loss of balance between positive and negative charges in a localized range. It is a kind of electric energy that remains on the surface of the object and has the characteristics of high potential, low electric quantity, small current and short acting time. The basic processes it produces can be summarized as: contact → charge → transfer → even electric layer formation → charge separation.
Anti-static clothing is suitable for electronics, optical instruments, pharmaceuticals, microbiology engineering, precision instruments and other industries. It has special work clothes with dust-free and anti-static properties. Its clothing is generally synthetic fiber fabric with embedded conductive yarn. The anti-static overalls made of conductive fibers are added to the chemical fiber fabric, and the power-dissipation is based on two mechanisms of charge leakage and neutralization. The antistatic fabric used is mainly made of an antistatic fiber or an antistatic synthetic fiber made of a conductive material which is wholly or partially mixed with an organic substance such as a metal at substantially equal intervals or evenly during weaving, or a mixture of the two. . 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.