Patent ID: 6019884
Filing Date: 2000-02-01
Classification: C25D

Abstract:
A method of correcting warpage of a steel strip in a horizontal electroplating line comprising current-carrying rolls and backup rolls with the steel strip held therebetween, the method comprising the steps of:providing at least one backup roll so that the backup roll is smaller than a current-carrying roll opposite to the backup roll; andprior to electroplating the steel strip, arranging the rolls so that the backup roll is offset relative to the current-carrying roll opposite to the backup roll in the movement direction of the steel strip, wherein the offset amount is determined prior to electroplating the steel strip according to the following equation: ##EQU8## wherein ##EQU9## d: offset amount t: thickness of the steel strip passed (mm).sigma..sub.T : tensile force of the steel strip passed (kgf/mm.sup.2).sigma..sub.e : yield stress of the steel strip passed (kgf/mm.sup.2)L.sub.1 : diameter of the current-carrying roll (mm)L.sub.2 : diameter of the backup roll (mm)a: constant, the value determined by the hardness and pressure of the current-carrying roll and the backup roll opposite to the current carrying roll, thereof.