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首页> 外文期刊>Journal of Applied Polymer Science >Studies on high-speed melt spinning of noncircuar cross-section fibers.II.on-line measruement of the spin line,including change in cross-sectional shape
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Studies on high-speed melt spinning of noncircuar cross-section fibers.II.on-line measruement of the spin line,including change in cross-sectional shape

机译：非圆形截面纤维的高速熔融纺丝研究II。纺丝的在线测量，包括截面形状的变化

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摘要

On-line measurement was performed in the high-speed spinning of fiat, hollow, and circular fibers of poly(ethylene terephthalate), paying particular attention to the change in cross-sectional shape along the spin line. The diameter profiles of hollow and circular fibers were essentially identical, whereas the deformation of fiat fiber shifted to the region closer to the spinneret. The necklike deformation of hollow and circular fibers started at the takeup velocity of 5 km/mm. In the case of fiat fibers, presence of the necklike deformation was confirmed at 4 kin/mm, and extremely steep diameter attenuation was observed at 5 kin/mm. The spin-line tension of the fiat fiber was also larger than that of circular fibers. Combined measurements of fiber velocity and thickness enabled us to evaluate the aspect ratio of the fiat fiber and hollow ratio of the hollow fiber in the spin line. These two factors were found to decrease steeply near the spinneret. Accordingly, the thinning of the spin line and the change in cross-sectional shape appeared to proceed independently.
机译：在线测量是在聚对苯二甲酸乙二醇酯的扁平，中空和圆形纤维的高速纺丝中进行的，要特别注意沿旋转线的横截面形状的变化。中空纤维和圆形纤维的直径轮廓基本相同，而扁平纤维的变形移向更靠近喷丝板的区域。中空和圆形纤维的颈状变形开始于5 km / mm的吸收速度。对于扁平纤维，证实在4 kin / mm处出现颈状变形，并且在5 kin / mm处观察到非常陡峭的直径衰减。扁平纤维的纺丝线张力也大于圆形纤维的纺丝线张力。纤维速度和厚度的组合测量使我们能够评估纺丝线中纤丝纤维的长径比和中空纤维的中空率。发现这两个因素在喷丝头附近急剧减小。因此，纺丝的细化和截面形状的变化似乎是独立进行的。

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