纤维截面形状及集束状态对涤纶黑度的影响

Influence of cross section shape and bundle state on blackness of polyester fiber

以聚对苯二甲酸乙二醇酯(PET)纺丝级切片及市售炭黑为原料,采用原液着色法及高速纺丝-拉伸(POY-DT)工艺制备十字形、扁平形、圆形、三角形截面无染黑色涤纶DT长丝,通过对纤维不同截面形状、纤维束间不同堆砌结构及孔隙面积的分析,研究纤维截面形状及集束状态对其黑度的影响。结果表明:制备的异形涤纶DT长丝中三角形纤维黑度最大,十字形纤维黑度最小;异形截面纤维内部有效平均光程从小到大依次为十字形、扁平形、圆形、三角形,截面内部有效平均光程越长,光线碰到炭黑粒子概率越大,光线完全被吸收概率越大,纤维黑度提高;异形纤维束集束孔隙面积从小到大依次为十字形、扁平形、圆形、三角形,纤维束间孔隙面积越大,光线在纤维间光程越长,光线被炭黑及聚酯吸收的概率越大,纤维黑度提高。

The non-dyed black polyester draw-textured(DT)filaments with cross-shaped,flat,circular and triangular cross section were prepared by using fiber-grade polyethylene terephthalate(PET)chip and commercially available carbon black as raw material via dope dyeing process and high-speed spinning-drawing(POY-DT)process.The influence of fiber cross section shape and bundle state on the blackness was studied through analyzing the different cross section shape,packing structure and pore area of bundles.The results showed that the obtained profiled polyester DT filaments exhibited the highest blackness for triangular cross section and the lowest blackness for cross-shaped cross section;the cross sections followed the order of cross,flat,circle and triangle according to the effective average optical path length from low to high in the interior of profiled fibers,and the longer the effective average optical path length in the interior of cross section,the higher the possibility of the beam meeting the carbon black and the higher the possibility of the completely beam absorption,hence the blackness rose;the cross sections followed the order of cross,flat,circle and triangle according to the pore area from low to high,and the greater the pore area of fiber bundles,the longer the effective average optical path length,the higher the possibility of beam absorption by carbon black and polyester,hence the blackness rose.