Static specialist Arrowquint has introduced a new range of Eltex R50 static discharge bars employing depth effect technology for use in environments where humidity is high or there is a risk of liquid contamination.
The bars are manufactured using a GRP extrusion incorporating stainless steel emission pins, sealed by a polyurethane compound to prevent moisture ingress. “This makes them virtually impervious to moisture as well as to a wide range of industrial chemicals and solvents,” says the company. The R50 bar’s high voltage cable connections are sealed, with the cable protected from mechanical damage by a flexible outer conduit.
For applications where access is limited, or where long or difficult cable runs are required, the Eltex R51 discharge bar is built to the same high specification as the R50, but its high voltage cable is easily detachable from the bar to assist maintenance or cleaning.
Eltex static discharge bars are ‘shockless’, and have EMC shielded co-axial supply cables and flexible mountings.
Arrowquint has also introduced an automatic mounting system, which ‘parks’ the static bars away from the web path when the machine stops, giving more space for cleaning and webbing up. When the machine is started, a PLC signal is used to move the bars back into the correct position to provide the required static discharge.
The new system has been designed for use with the Eltex range of Ex and ATEX approved static discharge systems.
The mounting system can be interlocked with the static system monitor to ensure that the bars are moved away from the web in the event of a fault, or if they become excessively dirty, in which case a warning signal is triggered.
By allowing the static control to be positioned within the Ex hazard area and much closer to the coating head, this system is said to minimise ignition hazards, allowing the coating head to operate at peak efficiency, without being affected by static charges on the web.
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