Patent ID: 8293121

Claim:
A method for forming fine wiring, the method comprising steps of: preparing a substrate for a printed circuit board; forming a metal thin sacrificial layer on the substrate using a first metal ink, wherein the first metal ink is an aqueous ink, and wherein the step of forming the metal thin sacrificial layer comprises: coating the first metal ink on the surface of the substrate; and drying to a degree sufficient to prevent flowing of the coated first metal ink by heat treating the first metal ink until the amount of the residual solvent of the metal ink becomes 10 to 90%; curing the metal thin sacrificial layer; after the curing step, forming a wiring on the metal thin sacrificial layer by ink-jet printing using a second metal ink, wherein the second metal ink is a non-aqueous ink; and removing a portion of the metal thin sacrificial layer to form a wiring pattern.