光缆PBT松套管的后收缩及其试验分析

Analysis of Optical Cable PBT Loose Tube Post Shrinkage and Its Experiment

本文通过对光缆拉伸试验和温度循环试验的论证,揭示出在光缆生产过程中选择合适余长的重要性;通过对标准PBT松套管进行SEM(扫描电镜法)和DTA(差热分析法)试验,发现其精细分布的结晶相含量达29%,这一数值远远低于易在PBT 中产生的结晶相的最大含量值(估计为66%)。最后我们得出:在松套管的挤出过程中,若选择数量比较大的结晶相,则能够减少套管的后收缩,从而减小光纤的衰减,改善挤出套管的机械强度。

Tensile and temperature tests of the optical fiber cable were carried out. Results of these tests showed proper cxcess fiber length selected during the cable production.SEM and DTA investigations of the standard PBT tubes disclosed a finely dispersed crystalline phase of ca.29%.The value is much lower than the maximal content of the crystalline phase liable to develop in PBT, estimated at 66%.It is very probable that greater quantity of the crystalline phase in tubes, selected during losse tube extruding, could reduce post shrinkage, thus reducing fiber attenuation, and improving mechanical strength of the tubes.