Method for forming a rustproof film on each wire of a PC strand

摘要

In a method for forming a rustproof film on a PC strand, the thickness of the resin film (26) is set to 200 ± 80 µm, the pre-heating is performed within a temperature range from 60 to 150°C to prevent an occurrence of a cob-webbing phenomenon as a result of melting of the synthetic resin powder coating material and the post-heating is performed within a range from 150 to 250°C in order to uniformize the thickness of the coats adhered to the outer peripheral surfaces of the core wire and the surrounding wires, and the temperature of the pre-heating is set to be lower than the temperature of the post-heating, and the synthetic resin powder coating material including particles having diameters in a range from 0.1 to 250 µm is used, and the line speed in the series of steps is set to 5 to 10 m/min.