Changing feature of cavity pressure with injecting pressure and holding up pres-sure,and the effect in crystallinity and rnechanical properties of PP injecting products,were stud-ied.

• 研究了注射成型中模腔压力随注射压力、保压压力变化的特征，以及这种变化对聚丙烯（PP）制件结晶度和力学性能所产生的影响。