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How To Prevent Plastic Injection Molding Voids issue

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

While 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.


Voids are air pockets or bubbles trapped within a part. They are the result of uneven hardening between the inner portions of a piece and its surface. Holding pressure that is insufficient to condense the viscous plastic and force air out can cause, or exacerbate, the problem as well. Voids can also result when the halves of a mold are not properly aligned.

Voids can be prevented by using a less viscous plastic, which allows air to escape more readily, increasing hold time and pressure, and ensuring the perfect alignment of mold parts.


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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