Technology Development of Spandex Covered Yarn

Spandex Covered Yarns consist of bare spandex as the core material wrapped with various yarns and fibers. In the covering process, the spandex is drawn at a constant ratio, fed through a hollow spindle and covered with a covering yarn from a flanged bobbin. Its properties, particularly elongation, elasticity and appearance, depend on the draft parameters, revolution speed and the covering yarn selection. The critical factors responsible for various properties of spandex covered yarns are the pre-draft of spandex and core spun yarn twist multiplier, which should be used in reasonable way to match the purpose of the fabrics.
Letswin Textile spandex covered yarn

Drawing roller is the most critical part of drawing system which controls the equipment performance and product quality in the textile machinery. The drawing system also has great influence on the quality of semi-finished products, evenness of the yarn and the appearance of finished products.
Development of drawing device of modern textile machinery has reached a considerable degree of maturity. Standardization of drawing equipment as well as precision of drawing effects are the directions towards which all drawing devices are being developed. High quality yarn can be obtained by matching the drawing process through optimization of the critical drawing equipment.
Usually, for drawing of general and elastic yarns, roller drawing based drawing system is used, whereas, the drawing system of traditional covered yarn machine uses the speed ratio of two rollers for the drawing of elastic yarn. The spandex unwinds actively by leading out of the feeder roller and entering the pre-drawing roller and finally, it goes into the hollow spindle. Smooth unwinding of spandex is controlled by the speed ratio of feeding roller to pre-drawing roller. The spandex is drawn due to the speed ratio of pre-drawing roller and doffing roller. Spandex is covered by hollow spindle driven outer wrapping fiber during which it is drawn 8-14 times.
Earlier, a new covering technology for producing covered yarns was proposed. Herein, a new method for controlling the drawing ratio of spandex yarn is proposed. In this method, the draw ratio can be controlled easily and the performance of the spandex yarn can also be protected during unwinding. The method will open new fields for the elastic yarn drawing ratio and will also provide the direction for traditional machine modification.

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Spandex Covered Yarn

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