本研究以兩種不同聚乙烯塑膠粒，經超臨界微細發泡所製成之發泡粒進行比較，首先利用不同溫度及壓力條件下，測試其體積膨脹率，發現在90℃，壓力20MPa時，具有最佳之膨脹率。再利用不同洩壓速率條件，分別測試其發泡孔、外觀色澤等，發現當洩壓速率越快時，孔徑則越均勻，色澤之變化也越明顯，而膨脹率亦隨之增加。
In this study, we use the two different polyethylene pellets by the microcellular, to compare foam aperture and appearance color in different temperature and pressure. The results show LDPE's molecule structure is fragile than HDPE's, LDPE foam aperture is more large and irregular, and it is appearance of the color is uneven.
