411-417Thedyeing and finishing performance of different bi-component polytrimethylene terephthalate/polyethylene terephthalate (PTT/PET) filament fabrics along with the elasticity of end-productshave been studied. Three kinds of PTT/PET side-by-side bi-componentfilamentshave beenselected as weft yarnalong with the polyester filament as warp yarn. Fabrics arethenwoven, dyed and finished under the same conditions. The weight reduction rate, widthwise shrinkage, elastic elongationand elastic recovery percentage of the above fabrics areobservedto characterize the changes involved during the process. The results indicate that asdenier per filament(DPF) increases, the weight reduction rate decreases but the widthwise shrinkageincreases. The weight reduction rate decreases as the weft density increases. The elastic recovery decreases as the elastic elongation increases. Optical microscope, scanning electron microscope, different scanning calorimetry examinations show that due to the finer DPF and larger specific surface area, PTT/PET filament exhibits separation of the two components, due to thecaustic corrosion during dyeing and finishing,and hence the high elasticity inherent in bi-component filaments is lost
