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为了克服单层松套管PBT材料在成缆中出现挤出后收缩对光纤余长控制的不良影响和提高套管的物理和化学老化性能，西门子公司开发研究了由双层材料组合而成的松套管结构和无张力托盘收线工艺。该技术消除了二次套塑后残余应力以及挤出后收缩现象，保证了成缆后光纤余长的精确控制
In order to overcome the adverse effects of single-wall loose tube PBT material in the cable after extrusion shrinkage on the fiber length control and improve the physical and chemical aging properties of the sleeve, Siemens developed a combination of two-layer material Loose tube structure and tensionless tray closing process. The technology eliminates the residual stress after the second plasticization and shrinkage after extrusion, to ensure accurate control of fiber length after cable