塑料注射充模流变过程的高速摄影研究

塑料注射成型是加工热塑性塑料的一种主要方法。注射过程中,塑料在注射机料筒和模具中经历着复杂的运动和变化过程,直接影响到充模的过程,和塑料制品的微观、细观、宏观结构(取向、结晶、熔合均匀性等),从而影响到塑料制品的物理—机械性能。所以充模过程是注射成型的核心过程。 本文采用透明模实验装置,对多种模具型腔的注射充模流变过程进行了高速摄影研究。文中介绍了试验装置、光路系统,以及摄影结果,并采用影片运动数据分析处理系统,对园形模腔的充模流变过程进行了定量动态分析,研究了充模流变过程的运动规律。这对完善塑料注射成型工艺的基础理论,摆脱了目前生产中经验式和技艺式处理问题的工作方法,对减少模具设计和工艺参数确定过程中的盲目性具有重要的意义。

AN INVESTIGATION OF RHEOLOGY BEHAVIORS FOR PLASTICS INJECTION MOLDING WITH HIGH SPEED PHOTOGRAPHY

In this paper, the rheology behaviors during the melting plastics injecting into a transparent mould were studied by high speed camera. According to these photos, the process of the melting plastics being full of the mold was analysed. The melting plastics flow into the round mold was measured and calculated in term of the films which were projected on a screen with a projector. Several forms of mold such as round, rectangle were tested.