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


Home - Blog - Creating a Custom Plastic Injection Mold

Creating a Custom Plastic Injection Mold

Date: 2023-4-25


Plastic injection molding is a widely-used manufacturing process that involves the creation of custom plastic parts. The process uses a machine to melt plastic pellets and inject the molten plastic into a mold. Once the plastic cools and solidifies, the mold is opened, and the part is ejected. Creating a custom plastic injection mold is an important part of the process, as it determines the shape, size, and features of the final product. In this article, we will discuss the steps involved in creating a custom plastic injection mold.

Step 1: Design the Part

The first step in creating a custom plastic injection mold is to design the part. This involves creating a 3D model of the part using computer-aided design (CAD) software. The design should include all the necessary features and dimensions required for the final product. It is important to consider the material properties of the plastic and the intended use of the part to ensure that the design is suitable.

Step 2: Create the Mold

Once the part design is complete, the next step is to create the mold. The mold is typically made from steel or aluminum and consists of two halves, the cavity and the core. The cavity is the part of the mold that creates the exterior surface of the part, while the core creates the interior features. The mold is created using a combination of CNC machining, electrical discharge machining (EDM), and/or wire-cutting.

Step 3: Test the Mold

Before the mold is used for production, it must be tested to ensure that it produces parts of the desired quality. This involves injecting plastic into the mold and evaluating the resulting part for defects or imperfections. If necessary, adjustments are made to the mold to improve its performance.



Step 4: Production

Once the mold is tested and approved, it is ready for production. The mold is mounted onto an injection molding machine, which controls the temperature, pressure, and speed of the injection process. Plastic pellets are melted and injected into the mold, where they cool and solidify to create the final part. The mold is opened, and the part is ejected for further processing, such as trimming or assembly.

Step 5: Maintenance

To ensure that the mold continues to perform well over time, regular maintenance is required. This includes cleaning, lubrication, and inspection for wear and damage. If necessary, repairs or replacements may be needed to keep the mold functioning properly.


Creating a custom plastic injection mold is a complex process that requires careful attention to detail and expertise in mold design and production. By following the steps outlined above, manufacturers can create high-quality plastic parts that meet the needs of their customers. With proper maintenance and care, the mold can be used for many years, providing a reliable and cost-effective solution for plastic part production.

Latest News