Where to mount a static control device?
One of the most common questions we are asked by manufacturers and end users is "what is the best place to put a static eliminator?" There is often confusion or uncertainty which is partly due to an unclear understanding of how static elimination works and partly due to power and range variations in static control devices.
As a general rule a static eliminator should be mounted immediately before the critical area where static is causing a problem. If you 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.
Fraser 1250-s Short Range Anti-Static Bar Fraser NEOS 30 Long Range Intelligent Static Control Bar
The material should be in free air! (see the coupling effect) 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.
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