31 Electric Polarity and the Amount of Electric Charge Human body How to read the triboelectric series Glass Mica Nylon Wool Silk Aluminum Polyester Paper Cotton Steel Copper Rubber Polyurethane Polypropylene Vinyl chloride Silicon Fluororesin 1: Electric polarity The materials mentioned in the upper part of the triboelectric series are charged positively and those mentioned in the lower part are charged negatively. Example 1: Glass (+) Polyester (.) Example 2: Polyester (+) Fluororesin (.) 2: Electric charge As the distance between 2 materials becomes greater, the amount of charge becomes larger. Example 1: Amount of charge between the human body and nylon (Small) Example 2: Amount of charge between the human body and polyurethane (Large)
Triboelectric series The “electric polarity” and “amount of electric charge” when 2 objects come into contact with each other, are shown in the triboelectric series. w Induction charging Induction charging is static electricity that is generated when a charged object gets close to another object without contacting it. This static electricity is difficult to detect because the objects do not come into contact with each other. + . + . + + + + . + + . . Highly charged workpiece When a charged object gets close to another object, electrons are attracted and polarized and the electrostatic meter indicates positive. When the charged object touches another object under this condition, it discharges. When the charged object is separated, it returns to its original state. When protons and electrons are balanced, an electrostatic meter does not detect static electricity. + . + Electrostatic meter Technical Information Static Electricity Induction