Even minor errors can cause physical defects in a part during the injection molding process. These defects may damage the part’s structural integrity or make it less physically appealing, with both problems likely leading to the part being unsaleable. Injection molding sink marks are an example of such a defect. This article examines what these marks are and how manufacturers can prevent them. What Are Injection Molding Sink Marks? Injection molding sink marks are small depre

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Most of the injection molding tools contain air inside the cavity when tightly closed. When plastic is injected the air needs to squeeze and go out somewhere. Mold venting enables air to pack and free up space for the plastic. The Problem With Poor Mold Venting Failure to vent a mold properly increases mold temperatures and increases the melt’s pressure. The combination of these issues can extremely heat the oxygen in the mold, causing an array of visual defects and part int

No matter the size of a production run, the presence of blemishes on the finished product leads to unhappy clients. Weld lines, which are also referred to as knit lines, are among the most common of these blemishes. This article looks at the issues presented by a weld line in injection molding and the techniques manufacturers can use to avoid them. Why You Need to Avoid Weld Lines Weld lines lead to two significant issues with an injection molded product. The first is that th

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This article details the benefits of the injection molding process, the general process and main types of injection molding.