发明名称 |
Method for forming rustproof film on PC strand and PC strand |
摘要 |
In a method for forming a rustproof film on a PC strand, the thickness of the resin film 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. |
申请公布号 |
US8882944(B2) |
申请公布日期 |
2014.11.11 |
申请号 |
US201313913583 |
申请日期 |
2013.06.10 |
申请人 |
Kurosawa Construction Co., Ltd. |
发明人 |
Kurosawa Ryohei;Hirai Kei;Matsubara Naoki |
分类号 |
H01B13/16;C09D5/08;D07B7/14;D07B7/18;E04C5/01;E04C5/08;B05D7/20;B05D1/06 |
主分类号 |
H01B13/16 |
代理机构 |
Wenderoth, Lind & Ponack, L.L.P. |
代理人 |
Wenderoth, Lind & Ponack, L.L.P. |
主权项 |
1. A method for forming a rustproof film on a PC strand comprising a series of steps of:
untwisting a PC strand and loosening surrounding wires from a core wire; performing pre-heating while adjusting the core wire and maintaining a loosened state; applying a synthetic resin powder coating material on outer peripheral surfaces of the core wire and surrounding wires and forming a resin coating adhered thereto respectively; performing post-heating; cooling the wires and forming resin films individually on outer peripheral surfaces of the core wire and the surrounding wires; and twisting the surrounding wires on the core wire into an original state, wherein the thickness of the resin film is set to 200±80 μm, the pre-heating is performed within a temperature range from 60 to 150° C. so as 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 temperature range from 150 to 250° C. in order to uniformize the thickness of the coating adhered respectively to the outer peripheral surfaces of the core wire and the surrounding wires, and the temperature of the pre-heating is set to a temperature lower than the temperature of the post-heating, 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, and wherein the temperature of the pre-heating is set to be at least 20° C. lower than the temperature of the post-heating. |
地址 |
Tokyo JP |