| 摘要 |
A method of making a composite structure comprising an elongate substrate, especially an insulated electrical cable, and a covering member which has been heat-recovered and sealed around the substrate. A heat-recoverable article of a cross-linked crystalline polymer composition which transmits 5-50% of infra-red radiation incident thereon is placed around a substrate whose exterior is composed of a polymeric composition which is at most lightly cross-linked, which absorbs infra-red radiation and which has a crystalline melting point below that of the heat-recoverable article. The assembly is exposed to infra-red radiation such that the heat-recoverable article is heated to its recovery temperature and the exterior of the substrate is heated to its crystalline melting point, preferably before it is contacted by said article as it recovers. In this way an excellent seal can be created between the substrate and the recovered article without the need for any auxiliary fusible material such as a hot melt adhesive. |
