In the present work, the texturability of filament yarns produced from recycled bottle grade polyethylene terephthalate (R-PET) and new fiber grade PET (FG-PET) were investigated and compared experimentally. Yarn spun on a spin-draw spinning machine was draw-textured. Elongation at break in each fiber was set to reach 30 ± 5% in the texturing machine. The effect of the draw-texturing conditions on thermomechanical, structural, and crimp properties were examined. Draw-texturing behaviors of the fibers were analyzed using differential scanning calorimetry and measurements of intrinsic viscosity, mechanical and crimp properties, density, and X-ray diffraction. The results indicate that crystallinity of the textured yarn from R- PET and FG-PET has increased compared to the semi-drawn yarns. Further, the lateral dimensions of the R-PET crystals are relatively well developed. Crimp properties show nearly similar response for two polymer yarns for the texturing process. It was found that R-PET can be the premier feed supply for the draw-texturing process and that filaments with appropriate confidence could be obtained from the R-PET.

中文翻译：

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再生PET长丝变形性试验研究

在目前的工作中，对由回收瓶级聚对苯二甲酸乙二醇酯 (R-PET) 和新纤维级 PET (FG-PET) 生产的长丝纱线的变形性进行了实验研究和比较。在旋转拉伸纺纱机上纺成的纱线进行拉伸变形。在加弹机中，每根纤维的断裂伸长率设定为 30 ± 5%。检查了拉伸变形条件对热机械、结构和卷曲性能的影响。使用差示扫描量热法和特性粘度、机械和卷曲特性、密度和 X 射线衍射的测量来分析纤维的拉伸变形行为。结果表明，与半拉伸纱相比，R-PET 和 FG-PET 变形纱的结晶度有所提高。更多，R-PET 晶体的横向尺寸相对发达。在变形过程中，两种聚合物纱线的卷曲特性显示出几乎相似的响应。结果表明，R-PET 可以作为拉伸变形工艺的主要原料供应，并且可以从 R-PET 中获得具有适当信心的长丝。