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Lesson 5: Rib Height

Designs for molded parts must meet many criteria, from appearance to dimensional stability. Ribs are a design feature that add strength and stiffness to molded parts. In this lesson we will look at ribs, specifically rib height, as an essential component of part design.

This lesson covers how to determine optimal rib height based on nominal wall thickness and rib thickness, potential molding challenges of tall ribs, how different materials impact fill patterns for different rib heights, and how rib height impacts injection pressures, flow-front temperatures, and the frozen layer.

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Part Design Rib Height 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.