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標題: | 石墨烯複合材料加熱器應用於微射出成型之微結構轉印製程開發 Application of Graphene Polymeric Composite Heaters in Micro-injection Molding for Replication of Microstructures |
作者: | Fang-Chi Chiang 蔣芳綺 |
指導教授: | 楊申語(Sen-Yeu Yang) |
關鍵字: | 微射出成型,石墨烯,複合材料,快速加熱,微結構, microinjection molding,graphene composites,rapid heating,microstructure, |
出版年 : | 2022 |
學位: | 碩士 |
摘要: | 微射出成型製程具備高自動化及生產週期快之優點,但在成型具有表面微結構之薄件產品時,會由於高溫熔膠接觸到冷模壁,充填過程中過早產生膚層會導致後續融膠充填不易,無法順利充填模穴,故本研究為改善此問題,在微射出成型製程搭配變模溫技術,並利用具有優良導電性、導熱性及機械性質的石墨烯,製作石墨烯複合材料加熱器在充填時局部於微結構處加熱,提升微射出成型之微結構轉印複製成型的能力。 本研究將石墨烯導電油墨塗佈至PI膠膜後,黏貼至公模仁挖槽內側,模穴面微結構區域正對石墨烯複合材料加熱器,並透過外部設置的電源供應器供應所需電壓,且與射出成型週期相互搭配,通電加熱升溫,以減少過早產生冷卻膚層。 實際成型實驗中,首先對於微結構模仁進行通電加熱升溫,加熱器和微結構面溫差僅10ºC,2片微結構面溫差也小於3ºC,接著進行V-cut之微結構成型實驗,在無通電加熱時,微結構複製轉寫率依距離澆口近、中、遠三處分別為68%、57%、51%,通電加熱,在35V電壓時轉寫率就有明顯提升至91%、91%、83%,而到40V和45V時微結構複製轉寫率達到95%、96%、91% 和99%、98%、94%,代表V-cut微結構已皆完整複製,本研究證實石墨烯複合材料加熱器可有效提升微結構複製能力。 Micro-injection molding process has the advantages of high automation and fast production cycle. However, when molding thin products with surface microstructures, high-temperature polymer melt will contact the cold mold wall, resulting in premature skin formation during the filling process. The skin layer will make the subsequent melt filling difficult resulting in failure in replication the microstructure. In order to solve this problem, the micro-injection molding is implemented with the variable mold temperature technology. Since graphene has excellent electrical conductivity, thermal conductivity and mechanical properties the graphene composite material heater is applied to the microstructure replication molding of micro-injection molding. In this study, the graphene conductive ink, coated on the PI film, was pasted to the inside of the male mold core groove. The external power supply supplies the required voltage to heat and during filling of the injection molding cycle to present the forming of skin layer, enhancing the replication of microstructures. In the actual molding experiment, first, the microstructure mold core was heated up the graphene compsite heater, the temperature difference between the heater and the microstructure surface was only 10ºC, and the temperature difference between the two microstructure surfaces was only less than 3ºC. Then,the V-cut microstructures molding experiment was performed. Without this local heating, the replication rates are only 68%, 57%, and 51% at locations near, middle and away from gate. The location rates with the supply of 35V voltage are significantly improved to 91%, 91%, and 83%. With 40V and 45V, the microstructures replication rates reached 95%, 96%, 91% and 99%, 98%, 94%, showing that the V-cut microstructures have been completely replicated. This study proves that the graphene-polymer-compsite heater can be applied to enhance the replication of microstructures in micro-injection molding. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/84719 |
DOI: | 10.6342/NTU202204051 |
全文授權: | 同意授權(限校園內公開) |
電子全文公開日期: | 2027-09-29 |
顯示於系所單位: | 機械工程學系 |
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U0001-2609202210473500.pdf 目前未授權公開取用 | 7.88 MB | Adobe PDF | 檢視/開啟 |
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