| 摘要 |
PURPOSE:To enable economical and efficient bright annealing in the stage of annealing a bright metallic wire, by making use of the waste heat of a waste combustion gas, and reducing and removing the residual oxygen in the waste gas. CONSTITUTION:A bright metallic wire 11 such as an enamel copper wire or the like is passed through an annealing furnace 12, and is then immersed in annealing liquid 16 through a hood 15 for liquid sealing, so that the wire is cooled slowly and annealed. A waste combustion gas is supplied in this case into the upper passage 19 in the upper part of the furnace 12 from a supply device 14. The content of O2 is made zero by the reaction of CO and residual O2 in the waste gas owing to imperfect combustion. The waste combustion gas contg. no O2 is supplied onto the passage 13 to heat and anneal the wire 11 passing through the inside of said passage. Since no O2 is contained in the waste combustion gas for heating and the gaseous pressure in the lower passage is high, the entry of the atmospheric air through an inlet 13a into the passage 13 is prevented; therefore, the wire 11 is annealed without oxidation while the brightness thereof is maintained. |
