Choosing Between Cold and Hot Runner Systems
MoldMaking Technology – Get all the facts before selecting a runner system solution.
David Hoffman, Instructor and Director for Plastics Education and Training at American Injection Molding Institute, talks about making decisions between cold and hot runner systems.
Figure 1. This illustration of a two-drop hot runner system shows one drop as a threaded-in nozzle and the other as a compression/thermal expansion-fit nozzle. The red indicates areas of heat transfer for each style. Images courtesy of American Injection Molding Institute, Beaumont Technologies Inc. and Incoe Corp.
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The injection molding industry generally perceives companies that use hot runner systems as more advanced than companies that use cold runner systems. Often, shops make the decision to use a hot runner without considering a cold runner’s possible cost and quality benefits, or management dictates the decision as part of a cost-savings initiative.
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