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Precision Plastic Injection Molders

Part Defect

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Causes and Prevention of Burn Mark Defects in Plastic Injection Molding

Close-up of a plastic injection molding machine.

The goal of every plastic injection mold and parts manufacturer is to have each mold and part come out without issue or defect. However, like with all manufacturing processes, these flaws can be introduced due to a myriad of situations. Today, we’re looking at the plastic injection molding defect known as burn mark defects—what they are, what causes them, and how your injection molder can help avoid it in the first place.

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How to Prevent Sink Marks in Plastic Injection Molding

Close-up of an plastic injection molding machine.

The goal of every plastic injection mold and parts manufacturer is to have each mold and part come out without issue or defect. However, like with all manufacturing processes, these flaws can be introduced due to a myriad of situations. Today, we’re looking at a common issue with plastic injection molding known as sink marks – or sometimes just “sinks” – that often can show underlying issues with the mold and polymers of the product. In this blog, we’re going to review the sink defect, its causes and solutions, and how to avoid it in the first place.

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How Plastic Injection Molding Shrinkage Affects the Final Product

A closeup of small plastic parts meant to signify plastic injection molding shrinkage.

A part’s geometry, appearance, and performance can be largely impacted if a manufacturer doesn’t properly determine the shrink rate of the final product. It’s inherent in the plastic injection molding process, and if not accurately accounted for, it can result in timely and costly production line disruptions. Despite calculating the shrink rate, sometimes excessive shrinkage can occur, leading to further issues. Since it’s a complex process, let’s take a look at how and why plastic injection molding shrinkage affects the final product and the methods manufacturers use to compensate for it.

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How to Avoid Warpage in Plastic Injection Molding

A close-up of red, warped plastic meshed atop similarly warped mesh of varying colors.

Warpage can be one of the more frustrating injection molding defects, as it can range from a simple aesthetic problem to an issue that compromises the entirety of the part’s function. This defect can result from any number of variances occurring within the injection molding process. Fortunately, a combined knowledge of plastic flow behavior, material science, and machine and tool settings can prevent this defect. Let’s discuss how experienced manufacturers avoid warpage in plastic injection molding.

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What Causes Delamination in Injection Molding?

A board splintering into layers used to visualize delamination in injection molding

The goal of every manufacturer is to provide a final product free of defects by implementing quality control measures. However, if you find your manufactured parts are fracturing into separate layers, you’re witnessing a mode of failure known as delamination. The source of delamination can range from the plastics you use to the condition of your injection mold. Fortunately, Midstate Mold & Engineering has the experience necessary to troubleshoot the different causes of delamination in injection molding.

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Injection Molding Jetting Defects: Signs and Troubleshooting

Close up of the open cavity of a steel mold in an injection molding machine.

Every manufacturing process can introduce different defects into the final product. The goal of every manufacturer is to have the machines, process, and quality assurance in place to reduce and even remove flaws from final parts and products. Welcome to another blog on defects and how to detect and troubleshoot them. This week we look at jetting defects in plastic injection molding. Let’s go over what they are, how they are caused, and what injection molding companies do to avoid them.

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