EFFECT OF RECYCLING FIBERS FROM INDIGO DYED YARNS ON YARN PERFORMANCE

Abstract

Aim: Within the scope of the study, it was aimed to obtain pre-consumer yarn from the fibers obtained by recycling from indigo dyed waste yarns used as warp yarn in denim fabric production and to evaluate the performance of the produced yarns. Method: In the study, the fibers obtained by recycling from indigo dyed yarns were mixed at the rate of 30% in the blend, and the physical properties of the produced yarns were compared with the yarns produced with the original cotton fiber of the same number. Yarns are produced in Z twist direction by ring spinning method. For the study, Ne 7,12/1 ring slub and Ne 9,8/1 ring slub yarns were obtained as rigid yarns, and Ne 10/1 ring carded elastane and Ne 13/1 ring carded elastane yarns were obtained as elastane yarn. The unevenness and strength values of the produced rigid and elastane, original and recycled fiber yarns were tested with standard methods. The yarns' U%, CVm%, 200% neps, 40% thin and 50% thick place values and Rkm values were compared. In addition, since the waste indigo yarns from the mill can be evaluated, the cost input has been analyzed. Results: It was determined that the U% and CVm% values of the yarns containing pre-consumer fiber were 1% higher on average for all yarn counts, and this increase in unevenness with the use of recycled fiber was very low. It has been determined that the yarns produced by the evaluation of indigo yarns are more advantageous in terms of cost. Conclusion: As a result, it has been determined that the fibers obtained by recycling indigo dyed yarns, which are an indispensable part of denim fabric production, can be reused in denim fabric production despite some increase in unevenness and loss of strength.