Recycled poly(ethylene terephthalate) (R-PET) used in blends with a fiber grade material (F-PET) has been investigated in this paper. As-spun fibers of R-PET, F-PET, and R/F-PET blends were made at winding speeds ranging from 1000 to 4000 m/min (mpm), and subsequently drawn in the range of 5.4 to 1.35X to bear the same total extension ratio. The properties of fibers spun at high and low wind-up speeds with low and high extension ratios have been compared in terms of the orientation, crystallinity, and mechanical properties. The fully oriented yarns (FOY) prepared from R-PET show a tensile strength of 90% of the fiber grade, with 4.4 g/d (R-PET) to 4.8 g/d (F-PET). On the other hand, R-PET fibers spun at low wind-up speed with high extension ratio show better physical properties than that spun at high wind-up speed with low extension ratio, with 4.4 g/d (1000 mpm/5.4X) to 3.7 g/d (4000 mpm/1.35X). The results indicate that for R-PET material, the low wind-up speed with high extension ratio process provided advantageous environment for developing crystalline fiber structures.
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机译：本文研究了与纤维级材料（F-PET）混合使用的再生聚对苯二甲酸乙二醇酯（R-PET）。 R-PET，F-PET和R / F-PET共混物的初纺纤维在1000至4000 m / min（mpm）的卷绕速度下制备，随后在5.4至1.35X的范围内拉伸以承受相同的总延伸率。已经在取向，结晶度和机械性能方面比较了在高和低卷绕速度下以低和高延伸率纺制的纤维的性能。由R-PET制成的全取向纱线（FOY）的拉伸强度为纤维级的90％，从4.4 g / d（R-PET）到4.8 g / d（F-PET）。另一方面，在低卷绕速度下以高伸长率纺丝的R-PET纤维比在高卷绕速度下以低伸长率纺丝的R-PET纤维表现出更好的物理性能，为4.4 g / d（1000 mpm / 5.4X）至3.7 g / d（4000 mpm / 1.35X）。结果表明，对于R-PET材料，低卷绕速度和高延伸率工艺为晶体纤维结构的开发提供了有利的环境。
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