In this study, the properties of ring, rotor, and vortex spun yarns produced in different counts from cotton, viscose rayon, and 50/50 cotton-modal blended fibers were investigated. Yarn samples were converted into knitted fabrics in a single jersey circular knitting machine and dyed with reactive dyestuff to determine the physical performances of the yarns in knitted form. The results revealed that vortex spun yarns have lower hairiness and better pilling resistance over ring and open-end rotor spun yarns. Furthermore, viscose rayon yielded more satisfactory results in the vortex spinning system in terms of yarn strength, particularly in coarser yarn counts and hairiness.
The properties and spinning limits of carded cotton vortex spun yarns were investigated through the progressive change in yarn count. The yarns were tested for structural and physical properties. Critical parameters were obtained, including the ratio of wrapper fibers to core fibers, proportion and average length of different structural classes in the yarn. The structural analysis revealed that the wrapper fibers constitute an increasing proportion of the fibers as the yarn becomes finer. Moreover, the proportion and average length of different structural classes in vortex spun yarns change with yarn count. The analysis of the data obtained from yarn testing showed that as the yarn becomes finer, the yarn becomes more uneven and the number of yarn imperfections markedly increase. On the other hand, the tensile properties of vortex spun yarns remain almost unchanged as the yarn gets finer.
The thermo-insulating properties of both perpendicular- and conventional cross-laid lofty nonwoven fabrics, four different types each in terms of fiber fineness, are investi gated using a new static method with a heat flux sensor. The relationship between the thermal conductivity and the material density of all the samples is studied, and the compressive behavior of the materials and changes in thermal resistance with compression are also evaluated. The effects of fiber fineness and material density are examined and discussed as well.
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