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Midstate Mold & Engineering

Precision Plastic Injection Molders

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The Difference Between Normal and Medical Plastic Injection Molded Parts

Medical devices with blurred background in hospital.

We’re proud to be a mold maker and plastic parts manufacturer with many clients from the medical market. For those outside or just starting in the medical industry, it can be surprising how different and rigorous the demands and tolerances for medical plastic injection molded parts is vs. their commercial industry counterparts. Today, we’d like to look at three major places—plastics, QA, and traceability—these parts need to excel at to meet the requirements of the medical industry and patient use.

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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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