METHOD OF CLEANING METALLIC STRIP FOR CONTINUOUS ANNEALING EQUIPMENT AND THE SAME CONTINUOUS ANNEALING EQUIPMENT

摘要

PURPOSE:To improve cleaning efficiency and to prevent the defective cleaning of metallic strip surfaces by subjecting the metallic strip of a high passage speed to rough cleaning with pressurized hot water sprays of a specific pressure range in the fore stage of a cleaning stage using an alkaline soln. CONSTITUTION:The metallic strip S is cleaned by an electrolytic cleaning device using the alkaline soln. at >=600m/min passage speed with the continuous annealing equipment having the cleaning device on an inlet side. The strip S is first passed through the rough cleaning device 14 in the fore stage of the electrolytic device of this cleaning method and is introduced via a sink roll 14b into a rough cleaning tank 14a where the strip is run stably by plural support rolls 14d. The hot water of about 60-80 deg.C is injected to the strip S of this state under 8-12kg/cm<2> from the pressurized hot water sprays 14c to roughly clean the strip. The ordinary electrolytic cleaning of the strip S is thereafter executed. The degradation in the detergency in the electrolytic cleaning stage is prevented in this way.