中国塑料 ›› 2013, Vol. 27 ›› Issue (12): 73-78 .DOI: 10.19491/j.issn.1001-9278.2013.12.014

• 加工与应用 • 上一篇    下一篇

浇口尺寸对注塑制品性能的影响

郭峰霞 谢鹏程 丁玉梅 杨卫民   

  1. 北京化工大学机电工程学院 北京化工大学
  • 收稿日期:2013-05-02 修回日期:1900-01-01 出版日期:2013-08-26 发布日期:2013-08-26

Study of the Effect of Gate Size on the Injection Molding Products' Performance

Pengcheng XIE Yumei DING Weimin YANG   

  • Received:2013-05-02 Revised:1900-01-01 Online:2013-08-26 Published:2013-08-26

摘要: 采用实验方法研究了浇口尺寸及注射压力、注射速度等工艺参数对于熔体填充行为和聚丙烯(PP)注塑件拉伸性能的影响。实验中以3个不同大小的矩形浇口的拉伸样条作为模型,通过动态可视化实验平台对充填过程进行了观察,并对不同条件下熔体充模过程进行比对分析。此外,实验还对试件进行了拉伸测试。结果表明,浇口尺寸、注射速度和熔体温度均显著影响了熔体的充模速度;浇口尺寸的变化对制品弹性模量和拉伸强度会产生不同的影响,适当增大注射速度、注射压力均有利于提高PP注塑件的拉伸性能。

关键词: 注射成型, 浇口尺寸, 聚丙烯, 充填行为, 拉伸性能

Abstract: Experiment was carried out to study the effect of gate size and process parameters (eg. injection pressure and rate) on the melt filling behavior and tensile properties of PP injection molded parts in this paper. Three standard samples with rectangular gate of different size were taken as models, the filling process was observed by dynamic visualization experiment platform. By comparing and analyzing the melt filling behavior under different conditions, the conclusion was drawn that the gate size, injection rate and melt temperature significantly affected the filling speed of melt. The tensile test showed that the changes in the size of the gates would produce different influence on modulus and tensile strength of products. A suitable increase in the injection speed and pressure may improve the tensile properties of PP injection molding parts.

Key words: injection molding, gate size, polypropylene, filling behavior, tensile property