INSULATION COATING METHOD OF ELECTRICAL STEEL SHEET

摘要

PURPOSE: An insulation coating method of oriented electrical steel sheets is provided to increase improvement ratio of core loss by maximizing tensile stress on a surface of steel sheets because insulation coating solution is spread on the top and bottom of the electrical steel sheets as different application quantities. CONSTITUTION: An insulation coating method of oriented electrical steel sheets is as follows. An insulation coating solution is spread on the top and bottom of electric steel sheets as different application quantities by upper and lower coater rolls. The insulation coating solution is spread on the top of the electrical steel sheets at a density of 6-9g/m^2. The insulating coating solution is spread on the bottom of the electrical steel sheets at a density of 3-6g/m^2. The coater rolls respectively have a threaded roll surface having each different numbers of threads.