Transfer of negative current to wires during galvanising - by passing wire over contact roller running slightly faster than wire, producing self=cleaning action with reduced wire tension

摘要

In a wire galvanising process, transfer of the negative current onto the wire is achieved by contact rollers over which the wire passes. The contact rollers have the same circumferential speed as the passing wire and are subjected to corrosion, which requires frequent removal. Transfer of current from roller to wire is ensured by a relatively large wrap-round angle which increases wire tension. In the new process the rollers run at slightly higher circumferential speeds, approx 1.01-1.05 times greater than the linear wire speed and produce a self-cleaning action. The wrap-round angle of the wire is correspondinly reduced which lessens the tension in the wire. USE/ADVANTAGE - The process is used to galvanise wire, prevents corrosion of the cathodic roller and reduces frictional forces on the roller.