5—A TEST FOR LIABILITY TO ELECTROSTATIC CHARGING

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Abstract
A method and apparatus are described for testing materials in woven, knitted, or sheet form for liability to static trouble. The method enables simultaneous but independent measurements to be made of the charge produced by rolling or rubbing contact with a steel roller and of the rate of escape of charge to earthed clamps. Half-leakage times as short as a few milliseconds, and up to any duration, can be measured and the electrical resistivity of the sample determined without removing it from the holder. The sample is circular and has no edges exposed to the air, and conductances in all directions are automatically averaged. Leakage may be either along or through the fabric. The apparatus is suitable for determining the effects of pressure, speed, roller potential, etc. The results confirm that the life of static on fabrics is proportional to their resistivity.

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