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Lesson 6: Fiber Percentage

Some properties of polymer materials create complex shrinkage and warpage behaviors during injection molding. The addition of fibers to amorphous or semi-crystalline polymers adds an additional level of complexity. In this lesson we will focus on how the percentage of fiber in polymers affects shrinkage and warpage in injection molded parts.

This lesson covers how the addition of fiber to amorphous and semi-crystalline materials affects shrinkage and warpage, how gate placement affects injection pressures and fiber orientation, and how gate placement and the percentage of added fiber affect shrinkage and warpage behaviors.

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Fiber Percentage

Learn the fundamentals of process optimization by understanding how different phases in the injection molding cycle will influence the overall part quality. Build your Circle of Knowledge lesson by lesson. 

Goals of Processing: Shrinkage and Warpage (Level 1): 

  • Learn the fundamentals of shrinkage and warpage during the processing phase of injection molding
  • Gain an understanding of how part design, mold design, and process are connected and interdependent
  • Analyze real-life molded parts and learn the cause-and-effect behaviors of design and process

Section Description: 

Molding high-quality parts depends on many factors, including skillful part and mold design, an understanding of polymer material behavior, and an optimized process. Injection molding processing engineers must follow key steps to ensure consistently high-quality molded parts.

This section covers explanations, simulations, cause-and-effect analyses, and specific shrinkage and warpage examples.

Recommendation: Entry-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.