| 摘要 |
PURPOSE: To provide a steel wire for a wire cylinder which is excellent in impact resistance and corrosion resistance by coating the surface of the steel wire with a polyethylene substrate, a steel band wound up spirally and a polyethylene upper layer. CONSTITUTION: The surface of a steel wire 5 is coated with polyethylene, thereby forming polyethylene substrate 3, a steel band 2 is spirally wound up around the outer peripheral part thereof, and further coated thereon with polyethylene to form a polyethylene upper layer 1. In the wire cylinder in three layer structure, the upper coat polyethylene 1 sacrifices itself to cause separation when a hard stone is charged therein, thereby protecting the area of the under-coat polyethylene 3 from damages; the steel band Z reinforces the coated part while promoting the sacrifice separation of the upper layered polyethylene. The substrate polyethylene 3 is protected from a damage produced by a locally concentrated force to demonstrate corrosion resistance of the steel wire 5. |
