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Lesson 4: Artificially Balancing a Cold Runner

Cold runner systems should be designed with equal sizes and flow lengths to all cavities for a balanced overall process. In this lesson we will explore the implications of an unbalanced runner system and the modification necessary for artificially balancing cold runners.

This lesson covers why unbalanced runner systems have unbalanced filling behaviors and pressure spikes, the steps needed to artificially balance a runner system, how to achieve optimal filling patterns, injection pressures, and cooling behaviors, and why adding flow length may balance a fill pattern but create shear-related imbalances.

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Mold Design Artificially Balancing Cold Runners Play Screen

Learn the basics of mold design and how various design elements impact a molded part. Build your own Circle of Knowledge lesson by lesson. 

Goals of Mold Design: Cold Runners (Level 1): 

  • Learn the basics of mold design and how various design elements impact a molded part
  • Learn how to optimize different runner systems to achieve high quality molded parts
  • Analyze real-life simulations and learn to determine optimal outcomes

Section Description: 

Cold runner systems are an important aspect of mold design. By optimizing cold runner shapes and sizes, important molding processes such as pressure drops, polymer shearing, packing and cooling behavior, gate sealing time, and overall cycle time can be made more efficient as well.

Explanations, simulations, cause and effect analyses, and the uses of various design features are covered in this section. Understanding these design features is important because they influence the moldability, function, appearance, and quality of a part.

Recommended For: Entry Level Personnel, All Personnel

Length: Lessons are approximately 15-20 minutes long each

The Kruse Training platform delivers knowledge and expertise developed over two decades in the plastic injection molding industry. Now companies and individuals can access a state-of-the-art online training program, suited for all levels of knowledge.