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Midstate Mold & Engineering

Precision Plastic Injection Molders

Injection Molding Defects

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How to Prevent Flow and Knit Lines in Plastic Injection Molding

A black backpack buckle with a knit line down the center.

While plastic injection molding has made leaps and bounds over the years, it’s still not yet an exact science. There is a lot that can go wrong while getting your product ready for market. One such defect that can affect a part is flow and kit lines. Fortunately, by entrusting your project to an experienced manufacturer, some adjustments can be made to both the injection molding process and the tooling that can help avoid these defects. Let’s review some methods to prevent flow and knit lines in plastic injection molding.

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Flash, Spew and Burrs: Troubleshooting Mold Problems

An injection molding machine ejecting the finished part from the mold.

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 that goes by multiple names: flash, spew, or burrs, in which there is excess material attached to the part. In this blog, we’re going to review the molding defect, its causes, solutions, and how to avoid it in the first place.

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Injection Molding Defects: Vacuum Voids and Gas Pockets

Closeup of an open plastic injection mold for inspection.

When it comes to your plastic products, the only holes that should exist are the ones on the designs. Like with all manufacturing processes, plastic injection molding can introduce defects into their products. The important thing for the manufacturer and client to do is to detect the defects and then troubleshoot the problems that are causing them. This blog focuses on the two major source of holes – voids and bubbles – in plastic injection molding: vacuum voids and gas pockets.

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What Causes Splay on Plastic Injection Molding Parts?

Partially disassembled parts of a plastic injection molding machine.Just like in all manufacturing, plastic injection molding brings with it their own kinds of defects that can mar or damage parts. It’s critical to work with parts manufacturers who both understand and have the quality control and troubleshooting skills needed to avoid them hurting your bottom line. Not all defects are created equal, and it’s important for you as a client to understand what they are and their causes. Today we’re looking at “splay,” a typically cosmetic defect that might point at issues with your resin or manufacturing process. [Read more…] about What Causes Splay on Plastic Injection Molding Parts?