Spinning and properties of PET/PTT self-crimp composite filament yarns

This paper introduces the spinning process of PET/PTT self-crimp composite filament yarns according to the properties of PET and PTT polymers.The cross and longitudinal sections,crimp morphology,hot shrinkage,and tensile properties of PET/PTT self-crimp composite filament yarns were tested.The results showed that the side-by-side structure makes the composite filament yarns with a permanent three-dimensional curl after heat treatment.The initial modulus and breaking strength of the yarns after boiling water treatment decrease while breaking elongation increases.Blend ratio has great influences on the physical properties of the yarns such as crimp property,elastic recovery,tensile properties,and boiling water shrinkage.