Stretch fabrics become more and more popular in clothing industry. Not only sports fashion but also day-to-day garments have a better fit and retain their shapes, when elastic yarns are used. 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 very reliable. Optical yarn clearers, like the Zenit+ from Loepfe, offer the superior method for this application. Garment made of elastic yarns offer a better comfort, they fit better, and retain their shapes. Core yarns, which are used for woven and knitted stretch fabrics, consist of at least two different components. During production a staple fibre - e.g. cotton - is spun around an elasthane filament. Today, duo-core yarns made of three components, which are used for high quality denim, are a challenge for the spinning and winding process.
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