Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2604
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dc.contributor.advisor沈 君 洋zh_TW
dc.contributor.advisorJung-Yang Sanen_US
dc.contributor.author游家欣zh_TW
dc.contributor.authorYou, Jia-Shinen_US
dc.date2004zh_TW
dc.date.accessioned2014-06-05T11:43:37Z-
dc.date.available2014-06-05T11:43:37Z-
dc.identifier.urihttp://hdl.handle.net/11455/2604-
dc.description.abstract本論文針對吹氣拉伸成形PET寶特瓶之退火結晶過程進行電腦模擬。此退火過程為在吹氣拉伸成型過程中,將其外表面與熱模接觸而加熱,待其脫模後直接進行空氣冷卻,故可依此分為兩個結晶時期,分別是加熱結晶時期與脫模後之冷卻結晶時期。本研究中使用商業套裝軟體〝ANSYS〞來求解PET寶特瓶暫態過程之溫度分佈與變化。此外在結晶度方面,利用Malkin等人量測得到之等溫結晶線,回歸分析成Takayangi等人建議之模式,求出相關係數,並利用來評估退火過程之結晶變化,其中發現最大結晶速率發生之溫度為180 。論文中並針對模溫與相對結晶度間之關係,作一研究,研究結果發現,相對結晶度會隨著與熱模接觸時間之增長而增大。對於短貼模時間之操作,最終達平衡時之相對結晶度會隨著模溫之升高而增加;而對於較長貼模時間之操作而言,會有一個最佳之模溫可使最終之相對結晶度達到最大。本研究發現,當模溫高於最大結晶速率之發生溫度(180 )時,冷卻過程對最終之平衡相對結晶度之大小影響甚鉅。zh_TW
dc.description.abstractA computer simulation of the crystallization induced by annealing a stretch-blow PET bottle at an elevated temperature was performed. The PET bottle was assumed to be initially heated up by attaching its outer surface to a hot mold during the stretch-blow process. The crystallization can be divided into two stages, namely, a heating stage and a cooling stage. A commercial software, ANSYS, was used to solve the transient temperature distribution of the PET bottle. Takayanagi's model was adopted in evaluating the rate of crystallization during the annealing process. The crystallization isotherms measured by Malkin et al, were used to determine the corresponding coefficients. The maximum rate of crystallization was determined to occur at 453K . The effects of mold temperature on the relative crystallinity were investigated. It was found that the relative crystallinity significantly increases with the attaching time. For a short attaching time, the relative crystallinity increases with the mold temperature. For a long attaching time, an optimum mold temperature was found. This optimum mold temperature corresponds to a maximum relative crystallinity. In this work, it was found that the cooling process play an important role in affecting the final equilibrium crystallinity for operations with mold temperatures higher than the maximum crystallization temperature(453K).en_US
dc.description.tableofcontents目錄 中文摘要………………………………………………………………..……..Ⅰ 英文摘要………………………………………………………………......…..Ⅱ 致謝………………………………………………………………………..…..Ⅲ 目錄……………………………………………………………………….…...Ⅳ 圖目錄…………………………………………………………………...….…Ⅵ 表目錄……………………………………………………………………....…Ⅷ 符號說明…………………………………………………………………..…..Ⅸ 第一章 前言.......................................................................................................1 1.1 吹氣成形簡介.....................................................................................2 1.1.1 吹氣成形之方式.........................................................................2 1.2 塑料特性.............................................................................................3 1.3研究目的..............................................................................................4 1.4文獻回顧..............................................................................................5 第二章 PET之結晶動力分析模式....................................................................8 2.1 PET之結晶動力學...............................................................................8 2.2 結晶速率係數之修正.......................................................................12 第三章 熱傳分析模式.....................................................................................16 3.1熱傳基本理論....................................................................................16 3.1.1 熱傳導基本理論.......................................................................16 3.1.2 熱對流基本理論.......................................................................16 3.2 溫度場之有限元素分析...................................................................18 第四章 模擬分析流程與分析結果.................................................................25 4.1 有限元素模型建立...........................................................................25 4.2 模擬分析流程...................................................................................27 4.3 模擬分析結果與討論.......................................................................33 4.3.1 模具與PET寶特瓶之溫度分佈...............................................33 4.3.2 結晶度起始值對最終結晶度之影響.......................................34 4.3.3 不同模溫下之結晶過程...........................................................35 4.3.4 不同操作條件對厚度方向上結晶度之影響...........................36 4.3.5 與熱模貼合時間不同對結晶度之影響...................................38 4.3.6不同模溫與環境空氣溫度對最終結晶度之影響.....................38 第五章 結論.....................................................................................................41 參考文獻...........................................................................................................44zh_TW
dc.language.isoen_USzh_TW
dc.publisher機械工程學系zh_TW
dc.subjectcrystallizationen_US
dc.subject結晶度zh_TW
dc.subjectPETen_US
dc.subjectmaximum crystallization temperaturen_US
dc.subjectstretch-blowen_US
dc.subjectANSYSen_US
dc.subjectPETzh_TW
dc.subject最大結晶溫度zh_TW
dc.subject拉伸吹氣成形zh_TW
dc.subjectANSYSzh_TW
dc.title吹氣拉伸成形PET寶特瓶退火結晶過程之電腦模擬分析zh_TW
dc.titleSimulation of the Crystallization Induced by Annealing a Stretch-Blow PET Bottleen_US
dc.typeThesis and Dissertationzh_TW
item.grantfulltextnone-
item.openairetypeThesis and Dissertation-
item.cerifentitytypePublications-
item.fulltextno fulltext-
item.languageiso639-1en_US-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
Appears in Collections:機械工程學系所
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