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Lesson 12: Core Deflection

Producing high quality parts without molding defects becomes more complicated as part and mold designs become more complex.  Three-dimensional flow and pressure patterns inside a mold cavity can impact the deflection behavior of small steel features in a mold. In this lesson we will learn about core deflection, a common molding defect that can cause a multitude of other defects if not managed properly.

Topics covered in this lesson include: how core deflection impacts wall thickness differentials, how core deflection occurs during injection molding, when the risk of core deflection is highest, how gating and injection pressures impact core deflection, and how core deflection impacts wall thickness differentials.

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Core Deflection

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.