| 摘要 |
PURPOSE:To realize a simple and low cost lining, in which the adhesion property between a sheet having an ultra-high-molecular-weight polyethylene layer and a hollow tubular body is excellent and the wall thickness of a lining layer of which can be freely controlled, by a method wherein a sheet having the ultra-high-molecular-weight polyethylene layer is wound round a heat resisting core and, after that, inserted onto the inner surface of the hollow tubular body, integrally welded by heating and, after cooling, the core is removed. CONSTITUTION:A sheet having an ultra-high-molecular-weight polyethylene layer is wound round a heat resisting core so as to overlap its end parts to themselves. The heat resisting core must have an outer diameter smaller than the inner siameter of a hollow tubular body and at the same time a thermal expansion coefficient larger than that of the hollow tubular body. Next, the heat resisting core, round which the sheet is wound, is inserted in the hollow tubular body and, after that, heated up to a temperature exceeding the melting point of ultra-high-molecular-weight polyethylene, preferably a temperature within the range of about 140-280 deg.C so as to thermoweld the sheet having the ultra-high-molecular-weight polyethylene layer to the hollow tubular body in order to integrate both of them. The hollow tubular body with the integrated sheet having the ultra-high-molecular-weight polyethylene layer as a lining layer is cooled down together with the heat resisting core. Because the heat resisting core contracts itself by cooling, the core can be easily removed so as to manufacture a hollow tubular body with the lining layer onto its inner peripheral surface. |
