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Lesson 3: PVT

The goal of this lesson is to understand and evaluate PVT behavior of a molded part during the packing and cooling phase. Since material behavior depends on pressure, volume, and temperature, final volumetric shrinkage and in turn, part dimensions, are influenced by this behavior.

Topics in this lesson include: the PVT relationship and how it relates to shrinkage behavior of molded parts, understanding PVT curves, how PVT is measured, the differences in PVT measurements between amorphous and semi-crystalline materials, how packing pressure, degree of crystallinity, and volumetric shrinkages affect each other, and how process set-ups can affect packing and cooling behavior.

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PVT Play Screen

Learn the fundamentals of polymer material behavior and how different plastics behave during the injection molding process. Build your own Circle of Knowledge lesson by lesson. 

Goals of Polymer Materials: Material Behavior (Level 1): 

  • Learn the fundamentals of polymer material characteristics and basic polymer categorizations
  • Get a basic understanding of how different material behaviors will impact the molding process and the final molded part
  • Analyze real-life molded parts and learn the cause and effect behaviors of design and process

Section Description: 
It is important for part and mold designers not only to understand design principles, but also to understand the fundamentals of plastics. The choice of a plastic, or polymer, has a strong impact on the outcome of a molded part. Having a general understanding of the basic properties and structures of polymers will help part and mold designers, as well as processors, make choices and decisions that will optimize the final part.

Explanations, simulations, cause and effect analyses, and the introduction of various polymer material properties are covered in this section. The relationship between various polymers and how they behave during the molding process are evaluated and analyzed. Selecting the optimal polymer material for each design is key to a successful molding project.

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.