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Midstate Mold & Engineering

Precision Plastic Injection Molders

parting lines

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Gates, Pins & Parting Lines: Designing Parts for Injection Molding

A lot of work goes into designing injection molding parts and the molds that produce them. While there are a thousand considerations to keep in mind with parts, molds, and manufacturers, today we’re going to focus on three: gates, pins, and parting lines. Designing parts and molds for those parts with placement for these features in mind produces better results and underlines why collaboration with your manufacturer earlier in the process can help avoid costly redesigns or inefficient production later.

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Achieving Success with Undercuts in Injection Molding

A hand holding the snap and latch part of a black backpack, an example of an undercut used in plastic injection molding.

Undercuts can be defined as any protrusions, cavities, or recessed areas of a part that run parallel to a mold’s parting line. If undercuts are required for a particular part, it can complicate the injection molding ejection process, as the friction can interfere with the part’s separation from the cavity. Fortunately, if a part calls for undercuts, an expert injection molder will be able to apply additional tooling and engineering techniques to facilitate this separation.Let’s discuss some of the ways of achieving success with undercuts in injection molding.

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