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Lesson 2b: Runner Patterns, Part 2

Understanding cold runner patterns is an important aspect of mold design. As we learned in the first part of this lesson, the first step in designing a cold runner system is determining optimal gate placement and runner design. In the second part of this lesson we will learn about cavity spacing and runner layout.

The second part of this lesson covers cavity spacing and runner layout. Topics covered include fill patterns and injection pressures for different mold runner layouts, how pressure curves shift based on flow length, how injection pressure is related to runner volumes, and the impact of runner layout on cycle times, cooling behavior, and clamp tonnages.

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Mold Design Cold Runner Patterns 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.