Experimental Study on the Static Electrification in an Air-Conditioned Room in Winter. - Effects of Cloths and Floorcoverings

Abstract

A static electrification was studied on the various combination of cloths and floorcoverings in an air -conditioned 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. © 1982, The Japan Research Association for Textile End-Uses. All rights reserved.