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Injection Molding 101: Undercuts

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Injection molding undercuts

In this guide you will learn about the importance of avoiding undercuts in parts like these and why it is beneficial.

Undercuts in injection molding occur when excess heat causes products to lose their shape. They prevent products from being discarded and help achieve similarity between non-identical items by removing excess plastic.

Analyzing the shape and location for undercuts is crucial, and mold adjustments may be necessary. Continuous molten thermoplastic can deform molds, so undercutting is also needed for the molds. There are two types of undercuts: external and internal. Both methods help prevent molds or supplies from being rejected.

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