Plastic injection molding is one of the most widely used methods for producing custom plastic parts. It is suitable for manufacturing components of various sizes, complexities, and applications with high precision and repeatability.
How Does Plastic Injection Molding Work?
The process can be divided into several key stages:
1. Design for Manufacturability (DFM) Review
The process begins with a thorough DFM review based on the customer’s 2D/3D drawings, specified materials, and any special requirements. Our engineering team evaluates all critical aspects to ensure the design is optimized for molding. Once the DFM is finalized and approved, we provide a detailed mold structure drawing for customer records.
2. Mold Fabrication
Upon approval, mold fabrication typically takes around 4 weeks（depends on the structure of product). During this stage, the core and cavity are machined, assembled, and prepared for production. The mold is then mounted on the injection molding machine, where the core and cavity are clamped together with carefully calculated force to withstand the high pressure during injection.
3. Injection Process
Plastic pellets (raw material) are fed into the machine’s hopper and melted in the barrel. The molten plastic is then injected into the mold cavity under high pressure. This stage requires precise control of parameters such as temperature, pressure, and speed to ensure the material fills the cavity completely and avoids common molding defects. Multiple trials and adjustments are often necessary to optimize the process.
4. Cooling and Solidification
Once injected, the plastic begins to cool and solidify into the desired shape. During this phase, shrinkage occurs, which is carefully calculated during mold design to ensure dimensional accuracy. Cooling time is determined by the thermodynamic properties of the resin and the part’s wall thickness.
5. Ejection
After sufficient cooling, the part is ejected from the mold. Since the molded part shrinks slightly, it may grip the core tightly. Therefore, ejection requires controlled force to release the part without damage. The cycle then repeats.
Our Capabilities
We offer rapid prototyping with lead times as short as 7–10 days, and end-use production within 40 days, from mold fabrication to final production.
- Tooling: We use hardened steel molds for cost-effective, long-lasting performance and fast production cycles.
- Materials: We stock over 100 thermoplastic resins, including PC, ABS, PC+ABS, PA, TPE, TPU, and more, from trusted global brands.
Quality Management
Our commitment to quality is supported by internationally recognized systems and certifications:
- ISO 9001:2015 – Quality Management
- ISO 14001:2015 – Environmental Management
- IATF 16949:2016 – Automotive Industry Quality Management
- 6S Workplace Management System – SEIRI, SEITON, SEISO, SEIKETSU, SHITSUKE, SECURITY
- RoHS & REACH Compliance – All materials are fully compliant
Let’s Work Together
If you have a new project coming up, we’d love to support you with complete manufacturing solutions—from mold design and fabrication to mass production.
Feel free to contact us for a customized quote or technical consultation.
