| 摘要 |
This method is characterised in that a cylindrical protection sheath 6 composed of a calendered sheet/non-woven complex 7, 8 welded on itself is formed, the calendered sheet 7 being situated inside and the non-woven part 8 on the outside, the outer non-woven layer 8 is impregnated with an adhesive substance, the sheath 6 is entirely engaged inside the tube 1, 2 and the non-woven layer 8 impregnated with adhesive substance is held against the rough internal surface of the tube for long enough to ensure permanent adhesion of the protection sheath 6 inside the tube 1, 2. <IMAGE>
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