臺灣博碩士論文加值系統

　　本研究係利用自行製造之ABS + 20wt%PC /鋁鱗片金屬化塑膠粒包含三種有同重量百分比（20wt%, 27wt%, 33wt%），並使用三段式設計之射出成型螺桿，可得金屬化塑膠射出製品其鋁鱗片之平均展弦比156 ，使用漸進式設計射出成型螺桿，可得金屬化塑膠射出製品其鋁鱗片之平均展弦比達198；將金屬化塑膠粒給予射出成型，製得拉伸、衝擊和遮蔽效應測試試片之金屬化塑膠製品，並探討鋁鱗片之顯微結構、含量及展弦比對性質的影響。
　　由實驗可知鋁鱗片在遮蔽效應試片之射口易形成層間聚集現象，其聚集程度隨鋁鱗片含量增加而愈明顯，在澆道之層間堆積較不明顯，而澆口與基地之分佈則較趨均勻分佈。鋁鱗片在拉伸與衝擊試片之射口易形成層間聚集現象，其聚集程度隨鋁鱗片含量增加而愈明顯，在澆道之層間堆積較不明顯，在澆口有層間聚集現象，在基地有團聚現象。金屬化塑膠之衝擊強度、遮蔽效應和熱變形溫度會隨鋁鱗片展弦經增加而上升，但體電阻及拉伸強度則愈低；熱變形溫度及遮蔽效應鋁鱗片含量增加而上升，但體電阻、拉伸及衝擊強度則會隨鋁鱗片含量增加而愈低。

　　The research had used the metallized plastic of the ABS + 20wt%PC / Al flake with three different weight percentages (20wt5, 27wt%, 33wt5). Using the design of three - zone screw in the injection molding, and get the average aspect ratio of Al flake is 156. Using the design of progressive screw in the injection molding, and get the averge aspect ratio of Al flake is 198. Using the injection molding to get the tensile, impact and shielding test specimens, and discussing the microstructure and the effect of the content and aspect ratio of Al flake.
　　From the result, the Al flakes are piled up easily in the injector, and the degree of piling up increases by adding the content of Al flake. In the EMI testing specimen, the pile - up situation is modified in the fanshaped runner and the sheet gate, but there are still clusters of Al flake in the gate (single pointed gate) of the tensile and impact. The impact strength, shielding effectiveness and HDT are increased with the rise of aspect ratio, but the volume resistivity and tensile strength go opposite. The HDT and the shielding effectiveness are increased with the adding of the content of Al flake, but the volume resistivity, tensile strength, and impact strength go contrary.