Polymers: Injection Molding Process

Table of Contents

1. The Injection Molding Process Stages
   1. Plastification
      1. Barrel Temperature Zones
         1. Barrel Zone Locations
         2. Determining Zone Temperature
         3. Effect of Resin Type on Temperature
      2. Screw Recovery
         1. Shot Size
         2. Screw Speed
         3. Back Pressure
   2. Injection
      1. Injection Speed
      2. Transfer Position
      3. Pack Cycle
      4. Cushion
   3. Cure and Ejection
      1. Thermolator Temperature
      2. Cure Time vs. Resin Time and Part Geometry
      3. Cure Time vs. Warp and Shrink
      4. Part Ejection
2. Establishing the Process
   1. Step 1: Preparing the Plastic Resin
   2. Step 2: Pre-Heating the Barrel and Mold
   3. Step 3: Inputting the Initial Set Points
      1. Injection Pressure and Injection Time Limit Settings
      2. Shot Size Setting
      3. Transfer Position and Cushion Settings
      4. Screw Speed and Back Pressure Settings
      5. Injection Speed Setting
   4. Step 4: Loading the Hopper
   5. Step 5: Purging the Barrel
   6. Step 6: Starting the Initial Shots
   7. Step 7: Optimizing the Injection Speed
   8. Step 8: Performing the Pack Study (Gate Freeze)
      1. Initial Pack Pressure
      2. Gate Freeze Study
      3. Final Pack Pressure
   9. Step 9: Determining the Cure Time
   10. Step 10: Monitoring the Process