Influence of Fibre Fineness on the Properties of Recycled Polyester Blended Yarns

<p>This study provides a comprehensive analysis of physical characteristics of recycled polyester<br>(rPET)/modal and virgin polyester (vPET)/modal blended yarns produced using three different fibre<br>finenesses with varying blends. A comparative assessment of rPET and vPET fibres revealed that rPET<br>exhibited greater tenacity and breaking elongation. FTIR analysis confirmed the presence of identical<br>functional groups in both polyesters. Thermal analysis indicated that rPET had slightly higher<br>crystallinity, a faster crystallization rate, and lower transition temperatures than vPET. The results<br>showed that yarns containing rPET were stronger, more extensible, and had increased hairiness, along<br>with slightly higher imperfections compared to vPET yarns. Additionally, rPET-blended yarns displayed<br>a higher unevenness percentage (U %) than those containing vPET</p>