1982 Volume 23 Issue 3 Pages 113-118
A static electrification was studied on the various combination of cloths and floorcoverings in an airconditioned room in winter. The room temperature was kept at 24.0±1.5°C with a relative humidity of 28.2±2.5%. Female subjects were asked to perform a physical movement, i.e., repetition of standing up from and sitting down on a chair. An electrostatic charge of the human body was measured.
Cloth materials tested in this experiment were made of wool, polyester and acrylic fibers. An electrical charge was produced by the repeated detachment of clothes from vinyl leather of a chair seat. The wool fibers gave a larger charge than polyester or acrylic fibers did, because its location along the orderseries of the frictional electrification was far from that of vinyl leather.
Floorcovering materials tested were nylon-carpet, acrylic-carpet, cushion floor and antistatic finished nylon-carpet. The last one, which contained the carbon black to prevent a static charge, showed the smallest density of charge, i.e., its charge did not exceed 2 or 3 kv, while charges of other materials reached 14 kv under the same conditions.
Some combinations of cloth and f loorcovering materials took a time longer than 10 minutes to lose their charges enough to the level lover than spark-discharging threshold. The individual difference in the amount of static charge was rather large. This might come from the individual difference in location on the order-series of the electrification and in the moisture content of their skin.
