Wrap yarns


Fig. 55 – Bundled yarns (wrap yarns)

Wrap yarns consist for the most part of fibers arranged in parallel without any twist (Fig. 55). These form the very thick core. Synthetic filament or staple fiber of the same kind as the core material is wrapped around this core but forms a small proportion of the fiber material. If the thread is wrapped with filament, it will have high strength, since the fibers themselves are stretched out and arranged parallel and are pressed closely together. The filament also contributes some of the strength. Accordingly, for a given yarn strength, fewer fibers are required in the  Number of fibers in the yarn cross-sectioncross-section.