Thermoplastic polyurethane light guide fiber and manufacturing method thereof

The invention relates to a thermoplastic polyurethane light guide fiber and a manufacturing method thereof. The thermoplastic polyurethane light guide fiber comprises a thermoplastic polyurethane core layer and a thermoplastic polyurethane skin layer. The thermoplastic polyurethane core layer has a first refractive index, and the first refractive index ranges from 1.5 to 1.7. The thermoplastic polyurethane core layer is coated with the thermoplastic polyurethane skin layer, the thermoplastic polyurethane skin layer has a second refractive index, and the second refractive index ranges from 1.4 to 1.48. Therefore, the thermoplastic polyurethane light guide fiber disclosed by the invention can improve the effective light guide distance, and has the advantages of flexibility, good flexibility, good extensibility and large fiber fineness range. In addition, the thermoplastic polyurethane light guide fiber is easy to process. 本发明是关于一种热塑性聚氨酯导光纤维及其制造方法。该热塑性聚氨酯导光纤维包括：一热塑性聚氨酯芯层及一热塑性聚氨酯皮层。所述热塑性聚氨酯芯层具有一第一折射率，该第一折射率为1.5～1