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Lesson 5: Gate Seal Time

Gate seal time is an important aspect of the packing phase that needs to be understood to produce high quality molded parts.  Setting proper gate seal time plays a key role in packing parts. Properly packed parts will have even internal polymer molecular structure, fewer volumetric shrinkage differences, optimized part dimensions, and fewer sink marks and voids.

This lesson covers the factors that influence gate seal time, gate size and process range: injection pressures, clamp tonnages, and gate seal times, and practical steps for setting proper gate seal time.

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Gate Seal Time

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.