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Lesson 24: Warpage, Part 9: Fiber Percentage and Processing

Shrinkage in molded parts is a complex behavior that involves the polymer material, part design, tool design, and molding process set-up. Understanding cause-and-effect behavior in injection molding is key to molding high quality parts. In Part 9 of the warpage lessons, we will focus on how the amount of glass fiber added a to a material and the molding process can affect warpage behavior.

Topics covered in this lesson include: how varying amounts of fiber content in a polymer can affect warpage; how part cooling temperature at the time a mold opens can be used to evaluate cooling and shrinkage behavior; why mold temperature can have considerable impact on polymer cooling behavior; and how to control part warpage with the molding process.


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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.