PREDICTING MAXIMUM SURFACE VOLTAGES ON INHABITED CLEANROOM GARMENTS IN PRACTICAL USE

摘要

The paper describes how the maximum surface voltages expected on cleanroom garments in practical use can be predicted from measurements on local areas of garment fabric. The surface voltage arising when materials are rubbed depends upon the speed and pressure of the rubbing action and on two features of fabric performance: the time for charge dissipation and the capacitance experienced by surface charge. These two features can be easily measured on sample areas of garment fabrics using corona charging with measurement of the quantity of charge transferred. The paper describes how these measurements are made and the results of studies carried out to establish the relationship between the performance of inhabited garments and measurements on fabrics. (The method of measurement developed for assessing materials was presented for consideration as a New Work Item at the IEC TC101 Standards meeting in Stockholm, November 2002).