ELECTROMAGNETIC WIPING APPARATUS, A PLATED STEEL SHEET WIPING APPARATUS HAVING THE SAME, AND A METHOD FOR MANUFACTURING A PLATED STEEL SHEET, CAPABLE OF PREVIOUSLY REMOVING THE PART OF A PLATING ADHESION LAYER ON THE STEEL SHEET USING ELECTROMAGNETISM

摘要

PURPOSE: An electromagnetic wiping apparatus, a plated steel sheet wiping apparatus having the same, and a method for manufacturing a plated steel sheet are provided to prevent the edge of the sheet from being over-plated and to deteriorate a gas wiping performance while maintaining the line speed of the sheet.;CONSTITUTION: An electromagnetic wiping apparatus includes a base (10) and an electromagnetic wiping unit (30). The base is formed at one side of a plated steel sheet which has passed through a plating bath. The electromagnetic wiping unit on the base controls the thickness of a plating adhesion layer on the surface of the sheet with varying a magnetic field. The electromagnetic wiping unit includes permanent magnets (40) and at least one electromagnet. The permanent magnets having different polarities are arranged into a certain pattern in the base. The electromagnet is applied with a single or a three-phase alternating current to the base so that a time varying magnetic field is generated in the base.;COPYRIGHT KIPO 2013