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http://dx.doi.org/10.5228/KSPP.2006.15.1.042

Development of New Runner System for Filling Balance in Multi Cavity Injection Mold  

Jeong Y. D. (부경대학교 기계공학부)
Publication Information
Transactions of Materials Processing / v.15, no.1, 2006 , pp. 42-46 More about this Journal
Abstract
For mass production, usually injection mold has multi-cavity which is filled through geometrical balanced runner system. Despite geometrical balanced runner system, filling imbalances between cavity to cavity have always been observed. These filling imbalances are one of the most significant factors to affect quality of plastic parts. Filling imbalances are results from non-symmetrical shear rate distribution within melt when it flows through tile runner system. It has been possible to decrease filling imbalance by optimizing processing conditions, but it has not completely eliminated this phenomenon during injection molding processing. This paper presents a solution for these filling imbalances by using Runner Core pin (RC pin). The Runner Core pin which is developed in this study creates a symmetrical shear distribution within runner. As a result of using Runner Core pin, a remarkable improvement in reducing filling imbalances was confirmed.
Keywords
Shear Rate Distribution; Viscosity; Filling Imbalance; Multi-Cavity Injection Mold; Runner Core pin; ABS; PMMA;
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