Comparative Study on the Impact of Carding and Blowroom Cotton Waste on Yarn Properties

Abstract

This study investigates the impact of blending different types of cotton waste - carding waste and blowroom waste - into Ne16 yarns, using both ring (SNC) and rotor (SOE) spinning methods. Blending ratios of 10% and 20% were applied to evaluate their influence on yarn quality indicators, including thick places (+50%/km), thin places (−50%/km), neps (+200%/km), and hairiness. The results show that increasing the proportion of cotton waste significantly affects yarn evenness. For SNC yarns, blending with carding waste at 10% and 20% led to increases in thick places by 17.2% and 37.9%, while blowroom waste increased thick places by 5.9 and 8.1 times, respectively. A similar trend was observed for thin places and neps, with blowroom waste having a much more pronounced negative effect than carding waste. The hairiness of SNC yarns also increased slightly with higher blending ratios, with blowroom waste contributing to greater hairiness than carding waste. In contrast, SOE yarns demonstrated better resistance to the negative effects of waste blending. For all indicators, SOE yarns exhibited significantly lower increases in defects compared to SNC yarns. For instance, the number of thick places in SOE yarns with 10% and 20% carding waste was only 20.5% and 23.3% of those in SNC yarns, respectively. Blowroom waste tends to deteriorate yarn properties more severely than carding waste, and rotor spinning (SOE) offers better tolerance to recycled material blending than ring spinning (SNC).