Physical Properties of Cotton Treated by Pad-Dry-Cure, Mild-Cure, Poly-Set, and Wet-Fix Processes

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Abstract
This study was directed primarily at the physical property changes in fibers, yarns and fabrics as smooth drying proper ties are developed in cotton by pad-dry-cure, mild-cure, poly-set and wet-fix processes. Bound nitrogen differed appre ciably in the final products, the maximum nitrogen being required in the wet-fix and the minimum in the poly-set cottons. Compared to pad-dry-cure cottons, tensile properties change more rapidly with bound nitrogen during the initial reaction periods for poly-set and wet-fix cottons and in the final reaction period for mild-cure cottons. Tenacity of single fibers had larger differences at the maximum levels of reaction than did those of the yarns or fabrics. In dual step processes, poly-set and wet-fix, strength decreased with each step. Recovery from tensile strain in single fibers was inversely related to retained strength, the wet-fix cottons had the smallest strength loss and the smallest increase in recovery. Incon sistencies between crease recovery for fabrics and strain recovery for fibers indicate that fiber properties other than strain recovery are affecting crease recovery and smooth-drying of fabrics.