WhatsApp: +86 19166273143 | emma.tan@tkbkl.com


Home - Blog - Injection Mold Components: Understanding the Basics

Injection Mold Components: Understanding the Basics

Date: 2023-6-4

Injection molding is a widely used manufacturing process in which melted plastic is injected into a mold cavity to form a specific shape. The process involves various components, each with a specific function. Understanding the basics of injection mold components can help you optimize your production process and ensure quality output.

The Mold

The mold is the primary component of the injection molding process. It is a hollow cavity in which the molten plastic is injected to form the desired shape. The mold is made of two halves that are held together by a clamping mechanism. The cavity and core are machined to the desired shape and size, and the mold is typically made of steel or aluminum.

The Clamping Unit

The clamping unit is responsible for holding the two halves of the mold together during the injection process. It applies the necessary force to ensure that the mold remains closed during the injection process and that the plastic is injected into the cavity without any leaks or deformations.

The Injection Unit

The injection unit is responsible for melting the plastic pellets and injecting them into the mold cavity. The unit consists of a hopper, a screw, and a barrel. The plastic pellets are fed into the hopper, where they are heated and melted by the friction of the screw turning inside the barrel. Once the plastic is melted, the screw pushes it into the mold cavity through a nozzle.

The Ejector System

The ejector system is responsible for removing the finished part from the mold cavity after it has solidified. It consists of ejector pins that push the part out of the mold, and a plate that holds the pins in place. The ejector system is operated by a hydraulic or electric motor that moves the plate and the pins forward and backward.



The Cooling System

The cooling system is an essential component of the injection molding process. It is responsible for cooling the mold cavity and the molten plastic to ensure that the plastic solidifies and takes the desired shape. The cooling system consists of channels that circulate water or oil around the mold cavity and the core. The cooling time depends on the thickness and shape of the part and can range from a few seconds to several minutes.


Injection molding is a complex process that requires a thorough understanding of the various components involved. By understanding the basics of injection mold components, you can optimize your production process, reduce defects, and ensure high-quality output. Whether you are a beginner or an experienced professional, it is essential to stay current with the latest trends and technologies in injection molding to stay competitive in today\’s market.

Latest News