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Lesson 4: Cup Part

As you’ve learned in the first three lessons of the Molding Process Development section, the injection molding process is a very complex and scientific manufacturing process. In this lesson we will apply the theoretical information covered in the first three lessons to an actual part. This lesson focuses on the development and execution of a process development strategy for a four-cavity molded cup part.

In this lesson you will learn: how to design a process to achieve a specific cycle time and eliminate residual molded-in stress; the steps to take to reduce a polymer material’s in-mold viscosity; how changing the packing and holding profile affects pressures and clamp tonnages inside a cavity; and how a closed loop-controlled two-step fill speed profile affects required injection pressures and clamp tonnages.

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Cup Part

Learn the necessary steps to successfully execute a process development strategy. Continue to build your own Circle of Knowledge lesson by lesson. 

Goals of Molding Process Development (Level 2): 

  • Learn the basic steps to prepare and set-up a molding cell
  • Understand and implement pre-process development steps
  • Prepare a mold for optimal functionality

Section Description: 

Plastic injection molding is a complex scientific manufacturing process that requires a methodology for setting-up a robust molding process. This section outlines a step-by-step guide that can be adapted to any new molding process development project.

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.