The Hot or Cold Choice

Working through a series of structured questions designed to filter away the many choices in cold and hot runner system design is a great, repeatable place to start.


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The decision to use a cold or hot runner system is one such critical recommendation. During this decision making process your focus turns away from the mold and toward the molding process. You need to figure out how to give the process engineer the largest processing window while also considering the budget and time.  It’s a balancing act.

Here are some links to melt delivery system solutions and applications:

Cold Runner

Cold runner overview and gate insert examples 

Cold runner with cashew subgate animation

Cold runner design tips *Courtesy of Beaumont Technologies, Inc.

Hot Runner

Design fundamentals

Building your hot runner system tips

Hot runner system technologies

*Courtesy of Mold-Masters / Milacron