SUPERFINE ENAMEL WIRE

PURPOSE:To obtain superfine enamel wire with high tensile strength and no resistance increase of a conductor by using an oxygen-free copper containing 0.03-0.5%wt. of silver as a conductor and having >=7% of elongation. CONSTITUTION:An insulating layer is formed on an oxygen-free copper conductor containing 0.03-0.5%wt. of silver and balance copper (including inevitable impurities) and having >=7% of elongation. The insulating layer is formed by applying an insulating paint of polyester, polyurethane, polyesterimide, etc., to the conductor and baking it by a conventional method, and among them, in terms of solderability, polyurethane is most preferable. By this structure, in spite of superfineness of the wire diameter, the tensile strength is heightened and wire severing in automatical coiling up and assembly processes does not occur.