Injection Molding: Injection Molding Process

Injection Molding Process is an informative, intermediate-level course on the injection molding process. In this course, learners are introduced to the stages of the injection molding process, including plastification, injection, and cure and ejection; the methods to optimize each step in the process; as well as the steps required to establish the process. Learners in quality, manufacturing, sales or related, and research and development in the industry will find value in this course.

Learning Objectives

  • Identify and understand the major steps of the injection molding process.
  • Recognize the methods to optimize each part in the injection molding process.
  • Distinguish between each step required to establish the process.
Course Length: 1 HRS

Table of Contents

The Injection Molding Process Stages

  • Plastification
    • Barrel Temperature Zones: Barrel Zone Locations
    • Barrel Temperature Zones: Determining Zone Temperature
    • Barrel Temperature Zones: Effect of Resin Type on Temperature
    • Screw Recovery: Shot Size
    • Screw Recovery: Screw Speed
    • Screw Recovery: Back Pressure
  • Injection
    • Injection Speed
    • Transfer Position
    • Pack Cycle
    • Cushion
  • Cure and Ejection
    • Thermolator Temperature
    • Cure Time vs. Resin Time and Part Geometry
    • Cure Time vs. Warp and Shrink
    • Part Ejection

Establishing the Process

  • Step 1: Preparing the Plastic Resin
  • Step 2: Pre-Heating the Barrel and Mold
  • Step 3: Inputting the Initial Set Points
    • Injection Pressure and Injection Time Limit Settings
    • Shot Size Setting
    • Transfer Position and Cushion Settings
    • Screw Speed and Back Pressure Settings
    • Injection Speed Setting
  • Step 4: Loading the Hopper
  • Step 5: Purging the Barrel
  • Step 6: Starting the Initial Shots
  • Step 7: Optimizing the Injection Speed
  • Step 8: Performing the Pack Study (Gate Freeze)
    • Initial Pack Pressure
    • Gate Freeze Study
    • Final Pack Pressure
  • Step 9: Determining the Cure Time
  • Step 10: Monitoring the Process

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