Design Engineering’s Importance in Injection Molding

September 22, 2024

Many steps are involved in creating plastic parts before the actual plastic injection stage is reached. One of the most critical of these steps is engineering a part's design, a step which has ramifications for every successive step along the way.

Importance of Design Engineering at Various Stages of Injection Molding Plastics

Part Design & Prototyping

Design engineers can help ask the right questions about your part or product to ensure you end up with the best results. They can help you determine your part's shape, how it can fit with other parts, areas where strength or flexibility are needed, and more. Finally, design engineers can ensure your part is actually moldable with injection molding techniques, or modify a part's design until it is and generate a prototype to test that design.

Choosing a Plastic Resin

Selecting an appropriate plastic resin for your product can have a dramatic effect on many aspects of production, including material costs, production speed, tooling costs, and product appearance, flexibility, resistance, and durability. Additional factors may play a role in resin selection, including additives such as color, plasticizers, and antibacterials.

Designing Molds

While there are countless parts and components you can design, each will require a mold to create it with injection molding techniques. In general, the more complicated the mold, the more expensive it is to machine. A design engineer can help you simplify your design to accomplish the same goals with reduced costs.

What Can Happen If You Skip Design Engineering

Failing to take advantage of the expertise and skills of design engineers in creating a part to be manufactured by injection molding can results in a number of undesirable factors, including:


  • Unnecessarily expensive mold tooling costs
  • Poorly performing products
  • Slow production as a result of extra molding or finishing steps
  • Weak or ill-fitting parts


At Bennett Plastics, our design team has the expertise and skills to bring your product successfully to life. Contact us today to learn more about all of our plastic injection molding and related services.

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