...词：聚丙烯；等规指数；萃取时间；萃取体积；抽提速度 [gap=1129]Key words: Polypropylene; Isotactic index; extraction time; extraction volume; extraction speed ...
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精油萃取率与萃取压力、萃取时间呈对数函数关系。
The extracting rate of the essential oil was logarithmically increased with extracting pressure and time.
微波萃取法可缩短萃取时间，提高提取率，但耗能大，成本高。
Microwave extraction can shorten extraction time, increase extraction yield, but energy consumption and product cost are high.
结果：影响萃取的因素依次为萃取温度、萃取浓度、萃取时间。
Result:It was found that the extracting temperature, the density and time influenced on the extracting factors.
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