For years, the trend in the apparel industry has increasingly been going in the direction of elastic fabrics and knits. The so-called core yarns, which are used for stretch fabrics, are a challenge for the textile industry. For example during yarn clearing, which eliminates yarn faults during winding, faults in core yarns have to be detected reliably. For core yarns, optical yarn clearers such as the Zenit+ from Loepfe Brothers Ltd., Wetzikon/Swit-zerland, offer the superior method for this application. Core yarns consist of at least 2 different components. During production a staple fiber -e.g. cotton - is spun around an elastane filament. New, duo-core yarns made of 3 components, which are used today for high quality denim, are a challenge for the spinning and winding process.
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