| 摘要 |
<p>PURPOSE: To prevent the damage to stencil display before and after a two- layered polyethylene coated steel pipe is embedded and to easily discriminate the history of the coated steel pipe. CONSTITUTION: In a two-layered polyethylene coated steel pipe 1, stencily display 5 is provided on a corrosion-proof polyethylene coating layer 3 on an undercoat painting layer composed of an adhesive or a self-adhesive and a transparent packing polyethylene coating layer 6 is formed thereon.</p> |
