Sources Of Static Electricity.
Primary Cause: Triboelectric Charging
Triboelectric charging occurs when two materials are separated after coming into contact with each other or any rubbing activities. The charging thus takes place during the transfer of electrons from one material to another. Triboelectric charging can happen between any materials such as solids, liquids and air particles.
Many instances, people at work are one of the key generators of static electricity. The simple act of walking or repairing a PCB is sufficient to generate thousands volts on the body. It is obvious that personal grounding is the first step to effective static control.
Packaging materials such as Static Shielding bags, Conductive bags, ESD containers and boxes provide direct protection of devices from electrostatic discharge. The principal use of these packaging materials is to protect the product when it leaves the ESD protected facility. The main ESD function of these packaging materials is to eliminate or minimize the possible impact of electrostatic discharge created from triboelectric charging, direct discharge, and electrostatic induction fields.
ESD Flooring And Footwear
A good combination of ESD floor materials and proper footwear provides a grounding path for dissipating electrostatic charges generated during walking. The use of ESD floor materials is particularly appropriate in those areas where increased personnel mobility is essential.
Proper ground of workstations plays an important role in protecting devices from electrostatically induced damages. ESD table mats, grounding cords and awareness signs are key elements in an electrostatic protective workstation.