Plastic injection molding is a versatile method used across industries to create a wide array of products, from consumer goods to automotive parts. It involves injecting molten plastic material into a mold cavity, which solidifies to take the desired shape. Unfortunately, many products fail to stand up to their intended use due to selecting the wrong resin material. Tensile strength, impact compression strength, chemical resistance, cooling temperature, and more must be taken into consideration when selecting the right engineered resin for a product’s intended use and requirements. Plastic Molded Concepts provides medical plastic injection molding for components used in end-use medical devices and complex assemblies within different systems. In addition to providing overmolding services, we also offer a comprehensive range of other plastic molding services including mold design assistance, modeling, prototyping, manufacturing, and testing. Cavity pressure is directly related to part dimension. The variation of cavity pressure will vary the dimension in a part.  The less the variation, the tighter the dimensional control or variation.  The higher the cavity pressure value gets the less the part will shrink, all other values remaining the same.  One rule of shrink to remember is that plastic shrinks less in the direction of plastic flow and more perpendicular to flow.  A common error in this process is when molders experiment with machine settings in order to determine when the gate freezes. At this point, a defect occurs in the parts and then reverses that move until the defect goes away. The problem with this is that the other 3 processes are going to interfere with the finished part properties in ways the molder cannot see. This mistake not only costs manufacturers money but costs customers when they find out their new plastic part does not seem to last very long in its intended use.Cooling and Injection Rates Defined: Plastic injection mold warpage is when the intended shape of the molded part is distorted during the cooling process, causing the part to fold, bend, twist or bow.

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Some of the most common overmolding materials include:HDPEABSPMMA (Acrylic)Acetal Copolymer (POM)PEEKPEIPBTR Since the nozzle is the final transfer point from the barrel to the mold, it’s essential to analyze. If the nozzle is too cold, the resin’s travel time can slow which prevents the molecules from getting properly packed. If the molecules don’t pack evenly, they will shrink at different rates which causes mold warping. Operating environments is a key component in plastic injection mold design. Environmental factors that can affect your part may include:TemperatureMoistureChemicalsCorrosionUV RadiationMaterial CompatibilityFlame RetardationAesthetics PMC serves a wide range of industries that need to improve an existing product, transition a part from metal to plastic, or bring an entirely new product to market. To discuss your injection molding challenges, reach out to one of our experts:

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If the operator opens the gate too soon and the product is ejected before the material incurred proper and even cooling time, the operator has shortened the process cycle. An inconsistent process cycle can lead to uncontrolled shrinkage rates, which then causes mold warping. Please note, we make components for medical devices – not end-use medical products. For more information regarding FDA requirements, please click here. PMC is recognized in the industry for solving complex molding challenges that other plastic injection molders can’t solve. We are able to specialize in this area of expertise because of our certified in-house Master Molders. Since so few plastic injection molding companies have certified in-house Master Molders, most are not able to solve molding challenges or create complex products. When it comes to plastic injection mold design guidelines, there are several important considerations to keep in mind, such as strength requirements, environment exposure, resin selection and more. Plastic Molded Concepts is one of the very few plastic injection molders in the U.S. (and the world) who uniquely specializes in engineering grade resins. PMC provides plastic injection molding services for mission-critical parts that play vital roles in markets like aerospace, military/defense, medical, automotive, electronics and more. Check out our case studies to learn how we have helped customers overcome complex plastic molding challenges.