Testing and analysis of structure and properties of metachromatic flat polyester filaments

To further optimize the spinning technology and improve the quality of metachromatic flat polyester filaments,three metachromatic flat polyester filaments with different specifications were designed,and their structure and properties were compared with those of pure flat polyester filaments.The results showed that the cross section of metachromatic flat polyester filaments is irregular rectangle with different sizes,with edges like ellipse.The distribution of thick and thin segments is the main factor influencing yarn property.The greater the percentage of the thick part,higher the yarn breaking elongation,moisture regain,boiling shrinkage and dye-uptake,but smaller the breaking strength.The dry heat shrinkage is less dependent on time but greatly influenced by temperature,especially,the metachromatic flat filaments,with significant increase in shrinkage.