| 摘要 |
<p>Primary wire for marine or undersea cable comprises a conducting core 10, typically a multifilament core of copper, and an insulating sheath comprising an insulating inner polyalkene layer 12 having a thickness of 0.35 to 1.0mm, preferably 0.5 to 0.75mm, and an outer protective layer 14 of polyvinylidene fluoride having a thickness of 0.15 to 0.3mm, at least the outer layer being radiation cross-linked. The inner and outer layers are preferably cross-linked together using electron beam radiation. The combination of the inner and outer layers of the sheath enables marine and subsea cables and the like to be made with smaller diameters, without loss of capacity or electrical properties and with an increase in overall performance such as temperature range and mechanical properties.</p> |
