The galvanizing bath containing high purity zinc (99.7%) is added carefully with controlled quantities of lead and aluminum. After exiting from bath, the galvanized strip goes through a fully closed loop system for controlling zinc coating thickness. The galvanized strip first vertically passes through a pin hole detector which gauges the coating of the zinc on the strip and the feedback this information to the computer. The computer then regulates the desired zinc coating thickness through a set of air knives. These air knives not only regulate the zinc coating thickness with high precision, they also make sure the zinc is coated or distributed evenly on each side of the galvanized strip.
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