| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite tube lightweight, low in cost, easily jointed by heat fusion and allowing a polyethylene tube to be piped in soil contaminated with an organic solvent or being exposed to the outside. SOLUTION: This composite tube is formed by winding a metal sheet on the outside of the polyethylene tube and further applying fiber reinforcement on the outside, or the composite tube is formed by winding the metal sheet on the outside of the polyethylene tube and further applying polyethylene coating on the outside. |
