Affiliation:
1. Grace Laboratory for Polymer Processing, Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan
Abstract
Abstract
Multi-cavity injection molding has been regarded as low cost mass-production method for producing plastic products such as optical elements. However, the flow imbalance during filling a multi-cavity mold using symmetrical runner system is a serious problem. This paper is devoted to improving the flow balance by modifying the runner system design. For this purpose, four eight-cavity molds with four modified symmetrical runner systems are designed, constructed and tested. They are tapering H-type runners, pinned H-type runners, curved A runners, and curved B runners. The flow imbalance in each runner system is observed and measured with the aid of short-shot experiments.
The experimental results indicate that the tapering H-type runner system can improve flow balance. The pinned H-type runner system fails to improve flow balance. The curved A and B runner system can reverse the imbalance trend, but the stability of the curved systems is poor at high melt temperature.
Subject
Materials Chemistry,Industrial and Manufacturing Engineering,Polymers and Plastics,General Chemical Engineering
Reference7 articles.
1. Troubleshooting Cavity to Cavity Various in Multi-cavity Injection Molds;Journal of Injection Molding Technology,1999
2. Observation of Gas Penetration in Symmetrical Tapering Ribs during Gas-assisted Injection Molding;Int. Polym. Proc.,1998
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