Widely used yarns - Core-spun yarns

These yarns are made with a central core of one fiber around which is wrapped or twisted an exterior layer of another fiber. Core-spun yarns may be made with elastomer core, such as Spandex, covered by another fiber to produce a stretch yarn. Other core-spun yarns include sewing thread made with a polyester core and cotton cover, suitable for high speed industrial sewing processes in which 100% polyester thread could melt due to the high temperature that the sewing needle may reach.