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Lesson 15: Dimensional Challenges, Part 3

Producing defect-free high-quality parts that meet visual and dimensional requirements is essential in the injection molding industry. Many common molded parts such as syringes, gears, and cups are round by design. Others have round design features such as bosses, through-holes, and seal grooves. This lesson focuses on achieving dimensional requirements when designing and molding round parts and round features.

Topics covered in this lesson include: the key factors for achieving dimensional roundness of a molded part; how wall thickness and gating can affect volumetric shrinkages, resulting in roundness and dimensional differences; and the importance of polymers and gating on fiber orientations and resulting dimensions.

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Dimensional Challenges

Learn about the causes of common molding defects and how to prevent them. Continue to build your Circle of Knowledge lesson by lesson. 

Goals of Molding Defects (Level 2): 

  • Learn about the various molding defects that can occur during the injection molding process
  • Gain an understanding of how part design, mold design, and process impact molding defects
  • Analyze real-life molded parts and learn the cause-and-effect behaviors of design and process

Section Description: 

Molding defects in injection-molded parts range from minor surface defects to major structural issues impacting overall quality. This section explains common molding defects, how and why they occur, and ways to minimize or prevent them.

Each lesson includes multiple samples of molding defects using interactive 3D parts. The examples allow the user to manipulate the part to gain a clear and concise understanding of how each molding defect would appear on a real-life injection-molded part.

This section covers video explanations, interactive 3D molding defect examples, simulations, and cause-and-effect analyses.

Recommendation: Expert-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.