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How To Prevent Plastic Injection Molding Warping issue

ABIS Mold Technology Co.,Ltd Updated: Apr 11, 2017

The correct application of the science of plastic injection molding can take you a long way toward creating the perfect part, there are still a number of issues that can arise. That’s where experience, and the art of plastic injection molding come into play.

Knowing what they are and how to avoid them can make all the difference between structurally-sound, properly-formed parts, and weak, deformed pieces that ultimately need to be scrapped.


Warping results in pieces having twists, bends, or uneven shapes that are not part of the design. It is typically caused when different parts of a mold cool at different rates. This non-uniform cooling results in internal stresses that warp the part when it is released from the mold.

A longer, slower cooling process can help prevent warping. Designing parts with uniform wall thicknesses, and selecting types of plastic that are less prone to shrinkage and warping are also helpful.

Ultimately, the ability to produce defect-free parts requires a detailed understanding of all the forces at work in an injection molding process, from architecture to physics to chemistry. To ensure that you get the end product you’re looking for, be sure the company you work with can confidently and completely explain the challenges, and the right responses, to you.

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