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Lesson 4: Dimensioning and Positioning Cooling Lines

Dimensioning and positioning coolant lines is an important aspect of heat removal from a mold during the injection molding process. The specific heat capacity and thermal conductivity of a polymer determines energy removal behavior. Because every polymer material has a specific cooling behavior, the heat removal process varies.

In this lesson we will look at how different circuit designs transfer heat from the polymer and the mold to the temperature control unit.

Topics in this lesson include: the importance of waterline sizing and positioning for removing heat from a mold; why waterline sizing does not necessarily impact heat removal; how different circuit designs and positions affect Reynolds numbers, coolant temperatures, and mold temperature ranges; and the importance of uniform heat removal from a mold.

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Dimensioning and Positioning Cooling Lines

Learn the basics of mold design and how various design elements impact a molded part. Build your own Circle of Knowledge lesson by lesson. 

Goals of Mold Design: Cooling (Level 1): 

  • Learn why the cooling phase of a molding cycle is the logical phase to optimize
  • Gain an understanding of the various type of cooling options to remove heat from a mold
  • Analyze real-life simulations and learn to determine optimal outcomes

Section Description: 

Injection molding is a process of heat exchange – the heat that goes into a mold must also be removed. Understanding the thermal behavior of polymers and the pathway of heat inside a mold is important for designing and processing a successful molding project.

Explanations, simulations, cause and effect analyses, and the uses of various design features are covered in this section. Understanding these design features is important because they influence the moldability, function, appearance, and quality of a part.

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.