Hello Static

The late fall and early winter season has arrived in Cincinnati and the telltale signs are everywhere – falling leaves, falling temperatures, and falling humidity.  The latter of these signs is a precursor to an indirectly proportional occurrence – the increase of static.

Static occurs when a similar electrical charge exists between two insulators.  Most often, the charge on the surface of these insulators causes them to repel one another, stick together, or causes the charge to seek an any available path to ground.  One such insulator that can be found everywhere is air, and the other can take on a variety of forms.  It can be the cardboard box used to ship a product, geotextile material used to increase soil stability, or (as is the case below) a PET bottle travelling along a conveyor line.

Plastic bottles on conveyor
PET bottles travelling on conveyor between cleaning and filling stages

In the photo shown above the plastic bottles are being transferred from one stage of processing to the next, and when reaching the next stage of the process the bottles need to be filled.  But, due to the static charge created during transfer along the conveyor, the bottles are sticking together, creating a process disturbance.

In this application, suitable product selection choices are quite extensive.  Super Ion Air Knives can be used on each side of the bottles to remove the static charge, an Ion Air Cannon can be positioned between the conveyor and the filling station, Ion Air Jets can be installed along the conveyor, or (if the line speed is slow enough) Ion Bars can be installed  to remove the static charge.

As the humidity of the ambient air decreases with the season, static problems inevitably increase.  If you have a static related application problem, contact an EXAIR Application Engineer for a suitable solution.

Lee Evans
Application Engineer

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