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The Cause & Solution to Mold Filling Imbalances
Technical Paper
2001-01-0850
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2001 World Congress
Language:
English
Abstract
This paper presents results of studies which have found that a severe shear and thermal imbalance exists between cavities molded in the industry's traditional “naturally balanced” runner designs. The imbalance has been found to be the major cause of variations in multi-cavity injection molds-limiting product consistency, lower statistical Cpk values and the number of cavities which can be used in molding high precision automotive parts. A new technology developed and patented at Penn State University, provide a simple solution which strategically positions the shear induced melt variations so that a true balance can be achieved. The resultant balance allows for higher cavitation tooling, improved Cpk values, an in increased process window and reduced damp tonnage. This new technology also shows promise in influencing flow of gas in gas-assist injection molding and warpage of molded parts by contolling the position of the higher sheared hot melt in a mold cavity.
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Authors
Citation
Hoffman, D. and Beaumont, J., "The Cause & Solution to Mold Filling Imbalances," SAE Technical Paper 2001-01-0850, 2001, https://doi.org/10.4271/2001-01-0850.Also In
References
- Oct. 14 1997 “ Branching Runner Thermal & Flow Balancer ”
- Beaumont, J. Young, J. Mold Filling Imbalances in Geometrically Balanced Runner Systems Journal of Injection Molding Technology 1 3 September 1997 133
- Beaumont, J. Young, J. Jaworski, M. Solving Mold Filling Imbalances in Multi-Cavity Injection Molds Journal of Injection Molding Technology 2 2 June 1998
- Beaumont, J. Young, J. Jaworski, M. Mold Filling Imbalances in Geometricall Balanced Runner Systems ANTEC May 1998
- Injection Molding April 98 Plastics News Aug. 10 98 Plastics Technology Sept. 98 Modern Plastics Oct. 98