Improve Needle Abrasion Performance of Insulated Cables by Using Coextrusion Technology

在电线电缆耐磨方面，已经有过许多研究，特别是在汽车行业和石油开采业，在近海石油工业中，电缆必须能够抵御来自延伸到井里面的检测工具的破坏。在汽车工业，耐磨要求处理主要是由于电线线束安装或组装的需要；为了避免由于直接或者间接的耐磨原因导致电线绝缘破坏使设计失效。

An experimental analysis is presented which shows that poor needle abrasion performance of thin wall insulated cables was largely due to a tearing mechanism which ultimately resulted in rapid wear. The data presented indicating that prolonging the onset of the tearing mechanism using coextrusion technology led to significant improvement in abrasion performance. This was because of the superior fatigue crack growth performance of the skin layer. Even though the present study dealt primarily with a high density polyethylene （HDPE） skin over cross-linked polyethylene （XLPE） insulation, the coextrusion technology developed here is applicable to other wire and cable systems which exhibit poor abrasion performance. An analysis is also described which demonstrated that needle abrasion performance and hence the mode of failure could be predicted from measurements of the compliance, tensile stress and fracture toughness of the resins. These parameters influence the size of the damage zone that resulted from contact between the test needle, the insulation and the wire.