• 作者： Lee, Woei-Shyong
• 中文摘要： 本文從理論探討同軸雙層紡絲系統中拉張振盪之不穩定性; 今採用一簡單模式組合來模擬此雙層紡絲系統,即以牛頓流體代表內層成分,而以upper-convected Maxwell模式表示外層成分。利用線性穩定性分析法針對此一簡單模式組合進行分析所獲得的結果顯示:當此二成分之延展流變性質大不相同時,在同軸雙成分共同擠出下,具有較高黏彈性質之外層成份有穩定系統的功效,可使得因牛頓流體所產生之拉張振盪現象延緩至較高之拉張比或是趨於穩定。此外,從研究中發現在某些條件下,同軸雙層系統達到之穩定最高拉張比遠高於各單成分單相紡絲所能達到之最高拉張比。
• 英文摘要： In this paper, the linear stability analysis of a concentric two-phase fiber spinning has been studied. A simple model has been adopted in which a Newtonian and an upper-convected Maxwell fluid are the core and the skin layer, respectively. This model is chosen to investigate a two-phase flow in which the two fluids have quite different extensional rheology. The results of the linear stability analysis indicate that the viscoelastic skin layer has a stabilizing effect in which the onset of draw resonance of a Newtonian fluid is delayed to a higher draw ratio by the coextrusion. Under certain conditions, the highest draw ratio for a stable spinning is much larger than those of the single-phase spinning of the two constituent fluids.
• 中文關鍵字： 共擠壓; 纖維; 拉伸振盪; 拉伸比
• 英文關鍵字： Coextrusion; Fiber; Drawing Resonance; Drawing Ratio