Black board white board with black print

摘要

The present invention provides a white board for a blackboard in which a dark blue line is printed on a steel sheet 10 by using a paint for a cancer lamp and a solid line 30 and a top line 40 are coated thereon, The production of a series of blackboard including the printing of the blackboard is automated and productivity is increased and the darkness 20 of the dark line 20 is not scattered by the dark line 20 and the dark line 20 is below the dark line 30 and the top line 40, The white board for a blackboard is excellent in that the dark lines 20 are not detached from the coating layer or abraded even if the black board 20 is used for a long period of time.