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Lesson 5: Box and Electrical Board

In this fifth lesson of this section, we will continue to apply the DOE theories from the first two lessons to real world examples of molded parts. As molded parts become more complex, the number of control factors and process parameters that impact part dimensional quality increases. This lesson focuses on a collection box with a living hinge and an over-molded electrical board part. A solid DOE strategy can be applied in similar manner to simple and complex molded parts.

In this lesson you will learn: how a DOE strategy can be utilized to determine the optimal process for achieving a flatness tolerance; how to apply a DOE strategy when material characteristics impact part moldability; and the importance of utilizing DOE when molding complex parts to minimize molding trial runs without compromising part quality.


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Learn the necessary steps to successfully execute Design of Experiments (DOE) strategy. Continue to build your own Circle of Knowledge lesson by lesson. 

Goals of DOE (Level 2): 

  • Learn the theory and framework of establishing a DOE strategy and how to apply this knowledge to real-world molding examples
  • Learn the five stages of conducting a DOE strategy and how to utilize various charts and graphs to analyze the data
  • Learn about several design types and how they can be applied to DOE

Section Description: 

Design of Experiments, or DOE, is a powerful mathematical tool that can be successfully applied to areas of new mold trials and to trouble-shoot potentially challenging processes. Experimental design techniques can be utilized by anyone with a fundamental understanding of injection molding. This section covers the fundamentals of DOE and how to apply a DOE strategy for molding quality parts.

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.