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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 own 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 that significantly impact overall part quality. This section shows you common molding defects, how and why the occur, and ways to minimize or prevent them.

NEW FOR LEVEL 2 MOLDING DEFECTS LESSONS: Each lesson has multiple samples of the molding defect using interactive 3D parts. The examples allow the user to manipulate the simulated part to gain a clear and concise understanding of how each molding defect would appear on a real-life injection molded part.

Video explanations, interactive 3D molding defect examples, simulations, and cause and effect analyses are covered in this section.

Recommended For: Mid-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.