Device for cooling a metal strip with a hot dip coating of high thickness

An installation for adjusting a thickness of a hot liquid coating on a traveling strip with suppression of “angel wing” flow defects, the traveling strip having a thickness equal to or greater than 2 mm, and for cooling the coating, the coating thickness being in a range above 25 μm, the installation successively comprising, from a bottom upwards, on either side of the traveling strip;

• a wiping device comprising gas knives configured to wipe excess liquid from the coated strip at an outlet of a liquid bath;
• at least one conventional gas cooling header with gas blowers configured to solidify the coating;
• and
• a water cooling and freezing header configured to produce airless spraying of demineralized water for skin freezing of the coating, the header being located as close as possible to the wiping device and between the wiping device and the at least one conventional gas cooling header, the water cooling and freezing header comprising one or more spraying nozzles, the one or more spraying nozzles being at a distance of between 50 and 300 mm from the traveling strip in use, the water cooling and freezing header being configured to spray water droplets with a size between 50 and 500 μm, with a water flow at a pressure of between 2 and 5 bar being between 0.1 and 5 m3/h, so as to increase a viscosity of an external surface or skin of the liquid coating, and not an entire bulk thickness thereof, before coating solidification is completed in the at least one conventional gas cooling header.