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Lesson 2: Understanding Flow-Induced Molded-In Stress

Injection molding is a complex manufacturing process involving temperature and pressure. During the molding process polymer materials experience complex molecular chain deformation while undergoing temperature and pressure changes. Molded part properties and performance are dependent on and influenced by design complexity and the molding process. In this lesson you will learn about molded-in stress, specifically flow-induced residual stress, and why it is an important aspect of molding high quality parts.

This lesson covers: the significance of flow-induced molded-in stress in the injection molding process, how polymer material affects flow-induced molded-in stress, and how processing conditions impact flow-induced molded-in stress.

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Understanding Flow-Induced Molded-in Stress

Learn the fundamentals of process optimization by understanding how different phases in the injection molding cycle will influence the overall part quality. Build your own 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 is dependent on many factors, including skillful part and mold design, an understanding of polymer material behavior, and an optimized process. It is important for injection molding processing engineers to follow key steps to ensure consistently high-quality molded parts.

Explanations, simulations, cause and effect analyses, and specific shrinkage and warpage examples are covered in this section.

Recommended For: Entry 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.