Study on Flow Imbalance during Filling a Multi-Cavity Mold Using a H-type Runners


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This study reports the experimental investigation on the flow imbalance phenomena during filling symmetrical multi-cavity in injection molding of optic elements. There are two aspects in this study: First, the flow imbalance in the eight-cavity mold with normal H-type symmetric runners were observed and measured with aid of short-shot experiments. Second, the effects of three processing conditions including injection speed, melt temperature and mold temperature on flow imbalance were investigated. Flow imbalances are consistently observed and quantitatively measured. The results have shown that proper injection speed, high melt and high mold temperature can reduce the flow imbalance.



Key Engineering Materials (Volumes 364-366)

Edited by:

Guo Fan JIN, Wing Bun LEE, Chi Fai CHEUNG and Suet TO




S. Y. Yang et al., "Study on Flow Imbalance during Filling a Multi-Cavity Mold Using a H-type Runners", Key Engineering Materials, Vols. 364-366, pp. 1306-1311, 2008

Online since:

December 2007




[1] J. Beaunomt, J. Ralston, A. Shuttleworth and M. Camovale, Troubleshooting cavity to cavity various in multi cavity injection molds, Journal of Injection Molding technology, v. 3, issue 2, PP 88-99. (1999).

[2] J. W. Bozzelli, Some Reasons Not To Use Multi-Cavity(>4) Tools, ANTEC (2000).

[3] H. E. Casaldi, T. Michel, Process Window as Effected by Shear Induced Flow Imbalance in Multicavity Molds, ANTEC (2001).

[4] P. Auell and M. Bailey, Effect of Thermoplastic Elastomer Material Properties on Mold Filling Imbalances, ANTEC (2002).

[5] G. Y. Su, H. Yokoi, W. M. Yang, Study on Filling Balance of Plastic Injection Molding in Multi-Cavity Mold with"H"Pattern Runner System, PPS (2003).

[6] Information of Beaumont Runner Technologies, Inc. on http: /www. meltflipper. com.