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Lesson 2: Short Shots (Part Design)

Generally, molding defects are caused by part design, mold design, or are process related. This lesson focuses on part design-related shorts shots, a condition where portions of a part remain unfilled. The previous lesson focused on process-related short shots. Injection molding is a complex scientific manufacturing process. By following a methodical set-up process, molders aim to minimize or eliminate common molding defects that affect part quality.

Topics in this lesson include: which part design factors can lead to short shot conditions; how to adjust rib size to eliminate race tracking, air entrapment, and other short shot risks; how gate size and placement can affect injection pressures and short shot risks; why overall nominal wall thickness distribution of part features should be optimized; and how adjusting process parameters can reduce the risk of short shot conditions.

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Short Shot Part Design

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.