Patent ID: 7285201
Filing Date: 2007-10-23
Classification: B05D,C09D,C25D,Y10T

Abstract:
1. A method for forming a multi-layer composite coating on a pre-sheared, electroconductive, flat blank having two major surfaces and sheared edges, said process comprising the following steps: (1) conveying the blank to a first electrodeposition bath located on a coating line; (2) applying a first aqueous electrodepositable coating composition to both major surfaces and the sheared edges of the blank as it passes through the electrodeposition, the blank serving as an electrode in an electrical circuit comprising the electrode and a counter-electrode immersed in the aqueous electrodepositable coating composition, the composition being deposited onto both major surfaces and the sheared edges of the blank as a substantially continuous electroconductive coating as electric current is passed between the electrodes; (3) conveying the coated blank of step (2) from the first electrodeposition bath to a first curing station located on the coating line; and drying the electroconductive coating as it passes through the first drying station; (4) conveying the coated blank of step (3), to a second electrodeposition bath located on the coating line; (5) applying a second electrodepositable coating composition to the coated blank as it passes through the second electrodeposition bath, the blank serving as an electrode in an electrical circuit comprising the electrode and a counter-electrode immersed in the second aqueous electrodepositable coating composition, the composition being deposited onto one of the major surfaces of the coated blank as a substantially continuous electrically insulating coating as electric current is passed between the electrodes; (6) conveying the coated blank of step (5) to a drying station located on the coating line; (7) curing the electrically insulating coating as the blank of step (6) passes through the drying station; and (8) forming the coated blank of step (7).