Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/1524
標題: 射出成型條件對PC薄成型品雙折射效應之影響
Effects of Injection Molding Conditions on the Birefringence of a Thin PC Product
作者: 邱聖文
Chiu, Sheng-Wun
關鍵字: Polycarbonate;聚碳酸酯;injection molding;birefringence;射出成型;雙折射
出版社: 機械工程學系所
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摘要: 
本論文探討射出成型條件對一個長寬高分別為62.5 mm x 25 mm x 2 mm之射出成型薄件的光學性質之影響,研究中使用光學級之聚碳酸酯(PC)為實驗塑料,所考慮之射出成型條件有模具溫度、射出速度、保壓壓力與模穴抽真空與否等。研究中使用光彈儀以觀察射出成型條件對成型品雙折射光學性質之影響,觀察之結果顯示,實驗參數中以保壓壓力對成型品雙折射現象之影響最大,保壓壓力大於15%後,成型品之雙折射現象會隨著保壓壓力之增加,而明顯地越趨於嚴重,研究之結果亦發現,保壓壓力主要作用於成型品之中心層,此中心層之雙折射現象為造成成型品產生雙折射現象主要之原因。而較低的模具溫度則可減少雙折射現象之發生;射出速度對於雙折射現象之影響則不大;此研究中試片之厚度為2 mm,在此情況下,模穴之抽真空對成型品之雙折射現象並未有明顯之影響。本研究中亦針對成型品之橫截面進行切片(~40μm),並以偏光顯微鏡觀察其結構,實驗之結果顯示,於高保壓壓力下,成型品前段與中段處之橫截面明顯地會出現折射率不同之表面層與中心層之結構,此結果亦證實保壓壓力是影響成型品雙折射現象的主要原因。

The effect of injection molding conditions on the optical characteristics of a thin product, with dimensions of 62.5 x 25 x 2 mm, was investigated. An optical-class polycarbonate (PC) was the injection molding material. Mold temperature, injection speed and packing pressure were the variables. In addition, the mold cavity was vacuumized to investigate its effect. The birefringence of the products was observed using a polariscope. The result reveals that, packing pressure is the most important factor affecting the birefringence. For packing pressure greater than 15%, the birefringence apparently increases with the packing pressure. The packing pressure mainly exerts on the core layer and causes it to form a severe birefringence phenomenon. The birefringence also increases with the mold temperature. But it appears almost irrelevant to the injection speed. For the considered product, its thickness is 2 mm, to vacuumize the mold cavity does not result in a significant effect on the optical characteristics. Cross-sectional thin specimens (~40μm) were prepared. The cross-sectional structure was observed using a transmitted-light polarization microscope. The result reveals that, for high packing pressures, difference structure layers (skin layer and core layer) were clearly observed. This also verifies that packing pressure is the most important factor affecting the birefringence of the product.
URI: http://hdl.handle.net/11455/1524
其他識別: U0005-0607200617514800
Appears in Collections:機械工程學系所

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