Electrostatic risk and specification of field and voltage limits for insulating web materials

Evaluation of electrostatic risk in production insulating web systems rely on electrostatic field or voltage measurements. Field meter measurement at the centre of a web span gives a direct evaluation of electrostatic risk from net web surface charge density. Surface voltage measured on the web against a grounded conductor can reveal the distribution of charges on each web film surface independently. Considerations for measurement instruments are given.