position it too far “upstream” the charge could be regenerated by rollers or other static generative processes. How far from the material? This depends on the type of static eliminator – there are short range, and long range static eliminators. Whichever type you use, the life of the ionised air produced is limited and generally good guidance says “the closer the better” subject to the minimum distance specified by the manufacturer. The material should be in free air! This is a very important rule which is often ignored. When a material touches another object, such as a roller, the static charge couples with that object and is not available to be measured or neutralised. If you put an anti-static bar to neutralise film when it is travelling over a roller it will not be effective. This is probably the most common mistake in the installation of static control equipment.