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Lesson 2: Flow Leaders

As plastic part assemblies become more sophisticated, individual part design becomes more complex. This complexity can create challenges for designers with nominal wall thickness as a goal in their part designs. In this lesson we will learn about the use of flow leaders. Also called internal runners, they are a design feature that help achieve uniform filling and packing. So, instead of increasing overall nominal wall thickness to allow for lower pressure but potentially adding material weight and cost, part designers can use flow leaders to assist flow where needed with only minimal weight increase.

This lesson covers when and why to include flow leaders into a part design, the potential process defects that can result from incorrectly designed and implemented flow leaders, and why flow leaders are instrumental in achieving uniform fill patterns in non-uniform designs.

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Part Design Flow Leaders Play Screen

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

Goals of Part Design (Level 1): 

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

Section Description: 
As plastic part assemblies become more sophisticated, individual part designs becomes more complex. This complexity can create challenges for part designers, as well as for mold designers and process engineers. Early in the part design phase, designers must establish design parameters, a necessary step for molding high-quality parts that meet specifications and expectations.

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.