一般的高分子塑膠一直是環保的棘手問題，生物可分解性材料基於對環境保護之優勢，將是未來取代一般高分子塑膠的重要趨勢。目前高分子塑膠在其射出成形及其它加工上已有相當的研究，但生物可分解性材料在射出成形上則較缺少加工參數的相關文獻。本研究針對生物可分解性材料的射出成形加工，提供最佳的加工參數組合。
本論文採用杜邦Biomax WB200與偉盟PLA3001D兩項生物可分解材料進行射出成形，並運用田口式實驗計劃法配合變異數分析，分析射出參數之影響。最後進行驗証實驗，以求証所得之最佳射出參數是否正確。探討的成形參數包括射出速度、保壓壓力、最大保壓速度、保壓時間，並考慮各因子間的交互作用及其在三種模溫下之影響。長度收縮率及拉伸強度為判斷最佳加工參數組合的主要指標，並利用SEM觀測斷裂面。實驗結果得知，對收縮率及拉伸強度影響最大的參數為保壓壓力，其次為保壓時間，而模溫的提高也有明顯的幫助，各參數間的交互作用並不明顯。本研究所得之最佳射出參數組合，將可供未來操作人員參考。

Nowadays disposal of plastic items have been a serious environmental problem. The biodegradable materials become an important trend to replace plastics in the future. Injection molding is a popular process to manufacture plastic products and there are many researches dedicated to this field. However, literatures regarding injection molding parameters for biodegradable materials are limited. Therefore, to fulfill this need, this research explored injection molding biodegradable materials and was expected to provide best combinations of process parameters.
In this thesis two biodegradable materials, Dupont’s Biomax WB200 and Cargill Dow’s NatureWork PLA3001D, were investigated. The Taguchi method was used to design the experiments and analysis of variance (ANOVA) was applied to evaluate the significance of each factor. Final verification experiments were also conducted. The selected parameters included injection speed, holding pressure, maximum holding speed, and holding time. The experiments were designed to observe the interaction between the parameters. Specimens were injected at three different mold temperatures. Shrinkage in length and tensile strength were the indices to evaluate the results. The cross-sections of fractured specimens were observed by SEM. The results showed that holding pressure was the most significant factor, while holding time was the second. Higher mold temperature was favored. There was little interaction between parameters. The best combinations of parameters can benefit future users in injection molding biodegradable materials.

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