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Lesson 1: Packing Pressure Profiles: Amorphous Materials

One of the key steps in the injection molding process is the packing and holding phase, sometimes also referred to as the compensation phase. In this lesson the term packing phase will be used to describe the full process step. During the packing phase material is continuously “packed” into a cavity, thereby compensating for the shrinkage that occurs due to material cooling inside the mold. Processors can optimize a packing profile by understanding the material characteristics of the polymer to be molded. In this lesson we will focus on packing profiles of amorphous materials.

This lesson reviews the internal structure of amorphous materials, risks of over- or under-packing a part, pack pressure and how it relates to volumetric shrinkages, clamp tonnages, and cavity pressure, and how to optimize a packing pressure profile using an amorphous polymer.

 

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Amorphous Packing Pressure Profiles

Learn the fundamentals of process optimization by understanding how different phases in the injection molding cycle will influence the overall part quality. Build your Circle of Knowledge lesson by lesson. 

Goals of Processing: Packing and Cooling Phase (Level 1): 

  • Learn the fundamentals of process optimization by analyzing the packing and cooling phase of molding a part
  • Gain an understanding of how part design, mold design, and process are connected and interdependent
  • Analyze real-life molded parts and learn the cause-and-effect behaviors of design and process

Section Description: 

Molding high-quality parts depends on many factors, including skillful part and mold design, an understanding of polymer material behavior, and an optimized process. Injection molding processing engineers must follow key steps to ensure consistently high-quality molded parts.

This section covers explanations, simulations, cause-and-effect analyses, and various packing and cool phase variables.

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.