What Is Plastic Injection Mold?

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What Is Plastic Injection Mold?


A plastic injection tooling is a special type of manufacturing tool used for injection moulding. They are usually made of steel.

Essentially, a plastic injection mold consists of a large cavity into which plastic is injected. This plastic flows around the core and the cavity, which have been built to create the proper size and shape of your component. Then, the plastic part solidifies on the mold, and is ejected from the mold once it’s hardened and solidified. Then, this process is repeated.

A high-quality thermoplastic mold can be used to make millions of plastic components, and is a must-have if you are creating high-quality, high-volume injection-molded components.

Plastic Injection Mold Terms

If you are new to the world of injection moulding, there are some key terms you may want to know while working with an injection mold supplier.

Injection mould

This is a steel or aluminum mold that is used to injection mold plastic parts in a high-volume production environment.

Cavity

This refers to the interior part of the mold tool, where molten plastic is injected and then solidifies to create your product

Core

This is the part inside the mold that protrudes, and it works with the cavity to create the proper shape of the product.

Mold Base

The mould base is a plate that supports the core and the cavity.

Parting Line

This is a line on the plastic product, which shows where the mold cavity and core come together.

Draft

The “draft” refers to an angle of a few degrees, which is used to make it easier to extract the product from the mold tooling once it’s been injection molded.

Sprue

Sprues are round chambers that are used to transfer plastic resin from the nozzle through the runner system in the mold

Ejection Pin

This is a metal shaft or pin that is used to automatically push a plastic product out of the mold.

Vent

A vent is a small space between the mould core and mould cavity, allowing high-pressure air to escape instead of remaining inside the mold. This prevents defects.

Gate

Gates are special channels in the tooling that allow melted plastic to flow into the mold tooling.

Slider

Sliders are a special type of mechanical structure, which are sometimes used to build specialized parts that can’t be created with a cavity and core alone.

Lifter

A lifter is a slanting block, which is placed inside the mould. It is used to create recessed or extruded part features.

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