Undestanding Plastic Injection Molds in Plastic Manufacturing
Mar 11, 2020

When molds and tooling are mentioned, what comes to mind are the parts that are produced through the use of processes like injection molding or plastic extrusion, blowing molding.

These parts can be used for a number of different purposes across different fields and industries, and getting them right the first time is extremely crucial in the success of whatever process they will be used for.


A mold is a hollowed out block that forms the shape of the product being made. It can be made of different materials, the most common of which are steel, such as hardened steel 1.2344, 1.2306, or prehardened steel like 1.2738, 1.2311, etc. Sometimes for prototype molds, we can also use Aluminum. It also has different components.

These components include pins, bases, lifters, ejectors, guides, bushings, and alignment devices.

Because the mold shapes the end product, it is always essential that the right type is used. The manufacturer should have a thorough understanding of the final product to be made. Otherwise, the entire chain – from the smallest parts to the roles they play – would be sacrificed.

Injection Molding

Now that you have a better understanding of the role molds play in the production process, you can better understand what injection molding is.

Injection molding, from the name itself, involves injecting any sort of material into a mold. Different materials can be used in the process, from metals to polymers, from glass to elastomers.

Basically, the forming material (as of plastic) will be fed into barrel by heating & then flow into mold cavity, and then form as it cool down to form the final shape of plastic part.

Blow Molding

Blow molding is used to produce hollow plastic parts. It can be done in 3 different ways: injection blow molding, injection stretch blow molding, and extrusion blow molding.

Basically, the process requires air to blow the plastic material into the mold. From here, the plastic cools down and the end product is formed.

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