FINAL ANNEALING METHOD FOR COPPER FOIL COILED STOCK

摘要

PROBLEM TO BE SOLVED: To provide a final annealing method by which laminated copper foil is mutually hard to adhere at the time of subjecting a copper foil coiled stock to final annealing. SOLUTION: A coiled stock obtd. by coiling copper foil having =99.9wt.% Cu content and 5 to 100m thickness so as to regulate the coiling density to =95%, preferably, to the range of 95 to 90% is subjected to final annealing at a prescribed temp., where the coiling density (%) is calculated by [4Lt/3.14(D2 -d2 )]100. In this formula, L denotes the whole length (mm) of the coiled copper foil, (t) denotes the thickness (mm) of the copper foil, D denotes coiling diameter (mm), and (d) denotes the outer diameter (mm) of the core. It is preferable that the final annealing temp. is regulated to the one satisfying the conditions in the range surrounded by ABCDEFGH in the fig. Before the coiling of the copper foil, it is subjected to cleaning treatment to remove impurities such as copper fine powder, rolling oil or the like adhered to the surface thereof.