Solvent Texturing of Polyester Yarns Using Trichloroacetic Acid/Methylene Chloride
The effects of trichloroacetic acid/methylene chloride (TCAc/MC) on the mechanical properties and solvent texturing of polyester yarns are studied. The treatments are carried out in unstrained and strained states at different concentrations of TCAc for various treatment times. Breaking load and elongation-at-break of treated yarns have been recorded. Treatments of polyester yarns with TCAc/MC in unstrained state have increased the elongation-at-break without significant changes in breaking load, Whereas, treatments of the yarns in strained state improved breaking load without significant changes in elongation-at-break. Solvent texturing of polyester yarns using TCAc/MC has been performed by twisting-solvent setting-untwisting process. The effects of setting times and TCAc concentration on the permanent and reversible shrinkage of textured yarns have been examined. It was shown that the shrinkage and texturing properties of solvent treated yarns increased with increasing concentration of TCAc and setting time. The results are discussed on the basis of the fine structure of polyester yarns.