異型複合纖維熔融紡絲程序之模流分析

Numerical Simulation of Melt Spinning Process of Profile-Conjugated Fibers

黃耀弘(Yao-Hung Huang 黃耀弘)

指導教授 ： 蘇淵源

國立臺北科技大學/工程學院/化學工程研究所/碩士(2012年)

https://doi.org/10.6841/NTUT.2012.00293

摘要

異型複合纖維獨特的形狀與其雙成份的加乘特性，賦予異型複合纖維功能多樣化，更由於芯層纖維特殊的形狀，締造不可替代性，能夠用來防偽，為品牌創造更高的附加價值。異型複合纖維融熔紡絲過程中，各高分子成分經由個別流道匯聚於紡嘴經縮口，形成共紡程序，並於出紡口後施加拉伸速度，達到理想纖維細度。在雙成分共紡程序中，由於兩熔體複雜的流變性及具激烈縮口的紡嘴幾何，對兩熔體間界面位置的決定有關鍵的影響，進而影響芯層纖維的幾何形狀，因此本研究利用三維有限元素法，搭配符合材料特性的本質方程式,針對紡絲條件、流變性質、拉伸效應對異型複合纖維成形，作一系統的深入探討並建立其模擬分析技術。異型複合纖維的成形，可透過流量比的控制與高黏度比的搭配，使芯層變異度降低而得到較佳的芯層纖維形狀。至於施加拉伸速度，只會使纖維的整體膨脹比下降，並不影響芯層變異度。此外，當改變芯層十字的進料位置，往X和XY軸方向偏心，可得到纖維偏心度與進料位置芯層紡嘴偏心距離成反比，當芯層紡嘴偏心距離達1/2半徑，芯層十字型纖維不易成形；然而，在雙芯層一字型纖維紡絲程序中，其纖維偏心度與進料位置芯層紡嘴偏心距離成正比。

關鍵字

異型複合纖維 ； 十字型 ； 變異度

並列摘要

The multi-functional features of profile-conjugated fibers are mainly attributed to its unique profile and the synergetic trait of each individual component. Moreover, a unique profile of the core fiber provides anti-counterfeiting function, and creates higher value added products. In a melt-spinning process of profile-conjugated fibers, polymers pass through each individual channel followed by a converging spinneret as a co-extrusion process, and then be stretched to an appropriate size after flowing out of the converging spinneret. The location of the interface between two distinct polymers is seriously influenced by complicate rheological properties and the abruptly converging geometry in the spinneret. This study uses three-dimensional finite element method and appropriate constitutive equations to systematically investigate the effects of individual throughputs, rheological properties and stretching speed on the formation of profile-conjugate fibers.It is learned from the numerical analyses that appropriate throughput adjustment of each individual polymers and the arrangement of higher viscosity ratio configuration in melt-spinning process are two major factors to obtain profile-conjugated fibers with a lower geometry variation. Stretching action, however, has no effect on the geometry variation. In addition, it is demonstrated that the eccentricity of cross-shaped cores of spun fibers at the end of spinning is reversely proportional to the eccentric distance between two inlet polymer streams. When the eccentric distance is larger than the half of diameter of conjugated fibers, the formation of conjugated fibers with a cross-shaped core layer is difficult. However, for profile-conjugated fibers with twin-dash core layers, the eccentricity between two dashes in as-spun fibers is proportional to the eccentric distance between two dashes at the inlet location

並列關鍵字

profile-conjugated fibers ； cross shape ； degree of variation

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