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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  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
  • Gain an understanding of cold runners and how they influence the molding process
  • Analyze real-life simulations and learn to determine optimal outcomes

Section Description: 
Cold runner systems are an essential 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 also be made more efficient.

This section covers explanations, simulations, cause-and-effect analyses, and the uses of various design features. Understanding these design features is important because they influence a part’s moldability, function, appearance, and quality.

Recommendation: Entry-Level Operators, Technicians, & Designers

Length: Lessons are approximately 15-20 minutes long each

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