| 摘要 |
The invention concerns an element (1, 10) having a substantially convex envelope surface (6, 7, 8, 14, 15, 18), containing a plastic material, such as polyethylene or polypropylene, having no adhesive strength or having low adhesive strength owing to adhesion. A supplementary coating (9, 19) consisting of a fibre-reinforced plastic material, which shrinks when cured, is applied on the envelope surface. |
