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1. (WO2010122931) METHOD FOR FORMING RUST-PROOF FILM ON PC STEEL WIRE AND PC STEEL WIRE

Pub. No.:    WO/2010/122931    International Application No.:    PCT/JP2010/056667
Publication Date: Fri Oct 29 01:59:59 CEST 2010 International Filing Date: Thu Apr 15 01:59:59 CEST 2010
IPC: B05D 7/20
B05D 7/24
D07B 1/06
D07B 1/16
D07B 7/18
E04C 5/08
Applicants: KUROSAWA CONSTRUCTION CO., LTD.
黒沢建設株式会社
KUROSAWAA Ryohei
黒沢亮平
HIRAI Kei
平井 圭
Inventors: KUROSAWAA Ryohei
黒沢亮平
HIRAI Kei
平井 圭
Title: METHOD FOR FORMING RUST-PROOF FILM ON PC STEEL WIRE AND PC STEEL WIRE
Abstract:
Provided is a method for the highly efficient formation of a uniform, high-quality film with which increased line speed, improved productivity, and cost reduction can be envisaged. A method for forming a rustproof film on a PC steel wire, wherein a stranded wire (1) is formed from PC steel, side wire (1b) is untwisted from a core wire (1a), a synthetic resin powdered paint is uniformly deposited by being applied and heated over the outer periphery of the core wire and side wire in this untwisted state, the product is cooled to form a resin film (26), and then the side wire is twisted back to the original state with respect to the core wire. Pre-heating is performed before the application step and post-heating is performed after the application step, the pre-heating temperature is set 30 to 130°C higher than the post-heating temperature, a synthetic resin powdered paint having an average grain size of 40 to 50 µm is used, and the process line speed is 5 to 10 m/min.