Core yarns are known as multi-component yarns in which one component, the core material, stays nearly at the center of the yarn while the others cover it. Stretch knitted or woven fabrics can be made from core yarns in which the core is an elastomeric filament such as Dorlastan®, Lycra®, Glospan®, etc., and the covering is made from staple fibers. Elastomeric core-spun yarns are usually made on cotton, worsted, or woolen spinning systems. In this study, we briefly describe a method of producing a polyester/viscose covered Lycra core yarn on a modified short-staple ring spinning frame. We also examine the polyester/viscose staple yarn and the polyester/viscose core-spun yarns produced on the modified system. The experiment and test results show that core positioning has a direct effect on the structure, properties, and performance of these core-spun yarns.
The most significant feature of nonwoven fabric is made directly from fibers in a continuous production line. While manufacturing nonwovens, some conventional textile operations, such as carding, drawing, roving, spinning, weaving or knitting, are partially or completely eliminated. For this reason the choice of fiber is very important for nonwoven manufacturers. The commonly used fibers include natural fibers cotton, jute, flax, wool , synthetic fibers polyester PES , polypropylene PP , polyamide, rayon , special fibers glass, carbon, nanofiber, bi-component, superabsorbent fibers . Raw materials have not only delivered significant product improvements but also benefited people using these products by providing hygiene and comfort.
Woven fabrics produced from microfilament yarns are superior to conventional filament fabrics in rain clothes, tents, parachutes, sails, wind-proof clothes, sleeping bags, filters, and surgical gowns due to their distinguishing properties such as good filtration, barrier effect against weather conditions, and light weight. Breaking strength and elongation are important and decisive parameters for these end uses since low strength properties shorten the useful life time as well disable the functionality of these products. In this study, breaking strength and elongation properties of microfilament woven fabrics are investigated in comparison to conventional filament fabrics. Three different weave types are used as 1/1 Plain, 3/2 Twill, and 4/1 Satin. Four different weft setts and five different filament finenesses are applied for every weave type. In doing so, 60 woven fabric samples are produced. Important influences of weft sett and filament fineness are observed on weft direction breaking strength. Analysis of variance (ANOVA) results are used to interpret the experimental data.
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