RUST PREVENTING METHOD FOR COPPER OR COPPER ALLOY STRIP

PURPOSE:To prevent the occurrence of color change in a slitter stage in which the sheet material of copper or a copper alloy is cut into plural strips by bring ing the same into contact with a vaporized rust preventing agent. CONSTITUTION:A sheet 1 of copper or a copper allay is cut into narrow plural strips 11 by fingers 2, which are coiled around a strip roll 13. Tension pad 3 are arranged between the fingers 2 and rolls 13, the strips 11 are sandwiched and the strips 11 coiled round the rolls 13 are applied with tension. A vaporizing rust preventing tank 4 is set between the tension pads 3 and rolls 13, gas in a rust preventive agent vaporized in the vaporizing rust preventing tank 4 is brought into contact with the strips 11 passing through in the vaporizing rust preventing tank 4, and rust preventing treatment is executed. The vaporizing rust preventing tank 4 may be provided on the upstream side, and the fingers 2 themselves may be provided with such treated parts. Thus, the copper and copper alloy strips having an excellent rust preventive effect can be obtd.