| 摘要 |
PCT No. PCT/SE89/00294 Sec. 371 Date Jan. 8, 1991 Sec. 102(e) Date Jan. 8, 1991 PCT Filed May 25, 1989 PCT Pub. No. WO89/12198 PCT Pub. Date Dec. 14, 1989.Pipe for relining underground pipelines, which is of the composite type having an annularly rigid corrugated outside wall (10) of polymer material, which is connected to the outside surface of a smooth inside wall (11) which consists of a thermoplastic elastomer so that it can be stretched and compressed. According to the invention there is provided on the inside of the smooth inside wall (11) a thin layer (13) of the thermoplastic having a lower frictional coefficient and/or greater wear-resistance than the material of the inside wall.
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