Community & Workforce Programs

Injection Molding Troubleshooting - May 2015

1. Surface Defects

  • Flow lines and jetting
  • Splay (moisture or trapped air)
  • Haze, blush, and poor gloss
  • Orange peel and surface ripples
  • Gate blush and gate splay

2. Burning and Contamination Problems

  • Burn marks and black specks
  • Burn streaks
  • Contamination
  • Discoloration or poor color match

3. Physical Problems

Injection Molding Troubleshooting - June 2015

1. Surface Defects

  • Flow lines and jetting
  • Splay (moisture or trapped air)
  • Haze, blush, and poor gloss
  • Orange peel and surface ripples
  • Gate blush and gate splay

2. Burning and Contamination Problems

  • Burn marks and black specks
  • Burn streaks
  • Contamination
  • Discoloration or poor color match

3. Physical Problems

Injection Molded Part Design Principles - August 2015

1. Part Design Guidelines for Plastic Parts

  • Benefits
  • Problems

2. Part Design Features

  • Feature that create design difficulties
  • Features that present molding problems

3. Material Shrinkage and Influences of:

  • Mold design
  • Process
  • Material type
  • Fillers

4. Material Flow

Injection Molded Part Design Principles - May 2015

1. Part Design Guidelines for Plastic Parts

Injection Mold Design Principles - May 2015

1. Tolerances in Mold and Part Design

Injection Molding Principles - March 2015

1. Overview of the Injection Molding Cycle

  • The injection unit
  • The clamp
  • The mold

2. Injection Control

  • The feedback loop
  • Charting pressure and velocity
  • Utilizing velocity-controlled filling
  • Pressure limited velocity

3. Plastics Flow During Injection Molding

  • The worm analogy
  • Laminar flow and fountain flow
  • Effects of temperature, pressure, and molecular weight

4. Shrinkage and Volume Changes

Injection Molding Principles - May 2015

1. Overview of the Injection Molding Cycle

  • The injection unit
  • The clamp
  • The mold

2. Injection Control

  • The feedback loop
  • Charting pressure and velocity
  • Utilizing velocity-controlled filling
  • Pressure limited velocity

3. Plastics Flow During Injection Molding

  • The worm analogy
  • Laminar flow and fountain flow
  • Effects of temperature, pressure, and molecular weight

4. Shrinkage and Volume Changes

Injection Molding Principles - June 2015

1. Overview of the Injection Molding Cycle

Injection Molding Principles - August 2015

1. Overview of the Injection Molding Cycle