For instance, galvanized material often suffers from crossbow arising from coiling, skin-pass milling or tension leveling. Once measured, crossbow is usually straightforward to remove either by bending in the tension leveler or the skin-pass mill (using an anti-crossbow roll). However, it must be measured accurately, which can be performed with a Shapeline gauge. In the figure below, you can clearly see how the crossbow can be minimized through tension leveler adjustments.
Each triangle shows a change in the strip bending after the exit cassette in a tension leveler. This process can also be automated. The principle has been used successfully in both hot-dip and electro-galvanizing lines. In electro galvanizing, flatness measurement can save electrodes through a warning about large crossbow or edge defects.