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Lesson 11: Jetting

Injection molding polymer through small gates creates complex three-dimensional fluid flow behaviors. Generally molten material is injected quickly into a mold cavity to avoid fill-related molding challenges. Jetting is a molding defect that can develop as a result of polymer viscosity and viscoelastic behaviors along with part and gate design.

Topics in this lesson include: how and why jetting occurs during filling; causes and preventative measures for jetting development; how gate location could either be the cause of or the solution for jetting and air entrapment; and how injection flow velocity impacts jetting behavior.

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Jetting

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.