| 摘要 |
PROBLEM TO BE SOLVED: To improve the reliability for the repair of the damaged part having a large area and arriving at the steel surface and to conduct the excellent repair that no peeling occurs by heating a polyolefin coating layer to the temper ature of the specific range with respect to the melting point of the polyolefin by far infrared rays. SOLUTION: The polyolefin coating layer of the periphery of a damaged part is coated with adhesive for polyolefin. The adhesive and the coating layer are melted and brought into close contact with one another by heating by far infrared rays. Then, the layer is coated with urethane resin or epoxy resin repairing paint. In this case, the heating is conducted on the layer at the surface temperature T of the range of (M=20 deg.C)<=T<=(M+40 deg.C) of the melting point M of the polyolefin. A far infrared heater 20 is obtained by coupling a plurality of solid heaters (cast with aluminum 25) coupled via a movable tie member 21. The heater 20 can easily repair a steel tube having a radius of curvature or a coated steel material having a bent such as a steel sheet pipe. A heating power source cable 23 and a temperature sensor 22 are provided. |
