Definition
FOY (Fully Oriented Yarn) is a synthetic filament yarn that is both spun and fully drawn in a single production step during the spinning process, resulting in maximum molecular orientation and crystallization of the polymer chains. Unlike POY (Partially Oriented Yarn), no subsequent drawing step is required. The result is a dimensionally stable yarn with defined mechanical properties such as high tenacity and low residual elongation.
Use in the textile industry
FOY is used primarily in applications requiring dimensionally stable, shape-retaining woven or knitted fabrics, such as technical textiles, lining fabrics, and smooth apparel fabrics. Due to its low shrinkage and uniform dyeability, it is especially suitable for articles that must not show significant take-up during further processing. Compared to textured yarns, FOY produces a smooth, lustrous surface.
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