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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 injection molding. Build your Circle of Knowledge lesson by lesson. 

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

  • Learning 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: 
Part and mold designers need to understand not only design principles but also the fundamentals of plastics. The choice of plastic or polymer strongly impacts 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.

This section covers explanations, simulations, cause-and-effect analyses, and the introduction of various polymer material properties. It evaluates and analyzes the relationship between various polymers and how they behave during the molding process. Selecting the optimal polymer material for each design is key to a successful molding project.

Recommendation: Entry-Level Operators, Technicians, & Designers

Length: Lessons are approximately 15-20 minutes long each

The Kruse Training platform delivers knowledge and expertise developed over three decades in plastic injection molding. Now, companies and individuals can access a state-of-the-art online training program suited for all levels of expertise.