In order to separate mixed recycled plastics HDPE/PP, HDPE (recycled bottle caps) and PP (recycled bottle caps) were studied in this research. Self-designed separator was used to separate the recycled plastics HDPE/PP with industrial ethanol and water mixture as the separation medium. Effects of parameters such as the separation amount of the separator, recycled HDPE and PP content before separation, the size of recycled plastic, the density of separation medium and the amount of wetting agent CaLS etc. on ...