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Beware of the “Naturally Balanced” Runner System

For years now the standard method designing a melt delivery (runner) system has been the naturally balanced runner system. A naturally balanced runner system is a runner configuration where there is an even flow length from the tip of the sprue to the end of each cavity with symmetrical cross-sectional shapes. While the naturally balanced runner system looks good from a visual standpoint, it is what lies underneath that leads to molding issues. This tech tip will explain the pitfalls of the naturally balanced runner system and how to avoid them.


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