Injection Molding 101 – Everything You Need To Know

When designing parts for plastic injection molding there are specific criteria to follow to produce optimal results. Wall thickness needs to account for material choice and part structure. Tapered sides, known as draft, are considered as well. Draft sides make the part easier to eject from the injection molding machine by allowing air into the mold.

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Engineers review part radii and weigh the benefits of incorporating rounded corners, potentially making for a smoother molding process. Coring out is a cost-saving method where extra material within a part is cut or hollowed out of the design. The designer places ribs throughout the hollowed area to maintain part strength. Coring out also reduces sink and stresses during the injection molding process. Parts are evaluated for design for manufacturability, or DFM, by injection molders before heading into the injection molding process. In some cases, engineers use a mold flow simulation to analyze and predict risks associated with the injection molding process. Simulations provide data allowing designers to adjust part tolerances quickly and precisely before tooling begins.

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