Part Design for Injection Molding

Course Description

RJG’s Part Design for Injection Molding course provides molders, tool makers, and design engineers with a common language and the universal knowledge required to successfully design and produce plastic injection molded components. Improving general knowledge of the steps required for part design reduces the risk of less than optimum tooling conditions, therefore minimizing exposure to injection molding non-conformities that do not meet the quality requirements of the customer.

Class topics address good manufacturing processes (GMP) for: plastic part design, fundamental material characteristics, basic tooling concepts, necessary processing characteristics, molding non-conformities, and tolerances. The course also discusses how part design and material selection affect the cost of tooling and piece price. During training, we utilize industry examples as reference, then dive into evaluating and improving designs. Attendees will work in groups to examine parts to identify where non-conformities will occur and methods to improve those risks.

I never expected how immediately Part Design for Injection Molding would prove beneficial to us. During class, the instructor presented us with a test method that proved a great addition to our existing methods. Within days of returning to our office, we were able to get the data we needed using the new test method. To top it off, the class was interactive, engaging, and fun. Everyone who attended got something out of it regardless of their experience level.

Part Design Attendee

Course Highlights

Part design

  • Wall Thickness
  • Flow Length
  • Features
  • Radius
  • Draft
  • Gloss


  • Thermoplastics or Thermosets
  • Melt Flow Index (MFI)
  • Shrink Rate


  • Steel
  • Line of Draw
  • Actions
  • Melt Delivery
  • Ejection
  • Surface Finish


  • Clamp Tonnage
  • Injection Volume
  • Injection Flow Rate
  • Injection Plastic Pressure


  • Melt Temperature
  • Flow Rate
  • Pressure Gradient
  • Cooling Rate & Time


  • Warp
  • Short Shots
  • Sinks
  • Voids
  • Bubbles
  • Jetting
  • Blush
  • Gloss
  • Knit Lines


  • First Article Inspection
  • Critical
  • In-Process

Design for manufacturability (DFM)

  • Part Design Checklist
  • FMEA

Course length: 3 days

Course Prerequisites


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