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Professional Plastic Injection Mold Manufacturing Service by China's Leading Suppliers and Factory

High-Quality Production Tooling in Manufacturing

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At King Sjeng, we specialize in providing top-notch tool-making and high-volume production services tailored to meet the demands of your plastic injection molding projects. As a leading China supplier, our advanced manufacturing techniques ensure that you receive complex parts and assemblies with exceptional consistency and efficiency. With rigorous process control and positive material identification, we can produce hundreds of thousands or even millions of parts while minimizing the cost per piece. Our factory is independently certified to the ISO 9001 standard, giving you complete peace of mind in the quality and reliability of our services.

    What is Production Tooling in Manufacturing?

    Production tooling refers to plastic injection molding tools that are built to withstand the rigorous demands of mass production while maintaining tight dimensional tolerances on every finished part.

    To do this successfully, tooling manufacturers must bring together the finest raw materials, advanced MoldFlow software, professional tool design, and precision machining in order to build a production tool that can be cycled hundreds of thousands or even millions of shots without degrading. Not every manufacturer is able to provide this level of experience or attention to detail.

    What molds can we process for you?

    • Single color molds are our advantage, and double color molds, over molds (2 time molding mold), and automatic thread-removing injection mold are our “signature dishes”.
    • Whether it's a cold runner mold or a hot runner mold, we have the ability to complete excellently, and our happiest thing is to see your satisfied smile.
    Single color mold

    Single color mold

    Insert mold

    Insert mold

    Overmold

    Overmold

    Bicolor mold

    Bicolor mold

    Automatic thread-removing injection mold

    Automatic thread-removing injection mold

    Mold Manufacturing-Main Machines

    Grinder

    Grinder: 2 sets

    Milling machine

    Milling machine: 2 sets

    High-Speed WEDM

    High-Speed WEDM 2sets

    Middle-speed WEDM

    Middle-speed WEDM 2 sets

    Injection Mold Manufacturing-Main Machines

    EDM

    EDM: 2 sets

    Mirror EDM

    Mirror EDM: 1 sets

    EDM

    EDM: 2 sets

    CNC

    CNC: 2 set

    Injection Mold Manufacturing-Workshop

    CNC machining

    CNC machining

    EDM processing

    EDM processing

    Mirror spark processing

    Mirror spark processing

    Grinder

    Grinder

    Mold assembly

    Mold assembly

    How to make high-quality molds?

    Excellent molds originate from excellent designs.

    ● Mold design is the most important fundamental factor affecting the quality of the mold, and of course the quality of the parts that it make.

    ● Mold design is a creative work, which not only requires designers to have professional skills and rich experience, but also requires rich imagination and creativity.

    ● A good design is one that allows the cavities to be completely filled in the shortest time, while maintaining stable and repeatable dimensional tolerances for all the features of the part.

    ● Achieving this level of stability over mass production runs requires very careful design and manufacture of the mold’s cooling channels. This helps the mold tool to withstand the thermal stress of thousands or even millions of heating and cooling cycles.

    Mold-Designer
    Mold-Designers
    Mold-making-mirror-EDM

    The selection of correct and qualified steel is the fundamental guarantee for making qualified molds

    ● There are many types of hardened and semi-hardened tool steels to choose from, including P20, NAK80, H13, and S136. They differ in the degree of corrosion resistance, toughness, thermal efficiency, and the ability to take a high polish.

    ● That’s why the choice of tool material that’s best suited for your project depends on your intended production volume, the surface finish of the part, the type of resin that’s being injected, and the complexity of the tool design.

    ● After communicating with you, our professional mold designers will determine which material to use based on your specific product structure, usage condition, etc.

    Mold-making
    Mold-making
    work

    Reasonable cost investment is a necessary guarantee for products to meet ideal requirements

    ● There is a saying in the industry, "70% molds, 30% injection molding", which is the importance of molds to products. There are simply too many variables to consider. However, we can identify the main cost drivers:

    ● Design complexity;

    1) Number of cavities;

    2) Mold tool steel;

    3) Surface treatment of the mold (polishing, plating, vapor deposition, etc.)

    4) Hot runner system

    ● The production molds can be a significant initial investment, but for high-volume production, the important question is cycle times and cost-per-piece.

    If the tool is made correctly, then it can be cycled more quickly and last much longer, which saves money in the long run.

    We will provide customers with a very reasonable mold cost, but more importantly, the quality and longevity of the molds are worth valuing.

    Mold-making
    Mold-making
    Mold-making

    A well-established supply chain

    Plastic Mold Manufacturing detail

    Frequently-used hot runner system

    Frequently-used steel

    S136
    2316
    718S
    PAK90
    420
    P20
    NAK80
    H13

    What are the advantages of using a hot runner?

    01

    Shorter molding cycle

    Due to the lack of cooling time limitations in the gating system, the molded parts can be promptly ejected after solidification. Many thin-walled parts produced using hot runner molds have a forming cycle of less than 5 seconds.

    02

    Improve product quality

    During the hot runner mold forming process, the temperature of the plastic melt is accurately controlled in the runner system. Plastic can flow into each mold cavity in a more uniform and consistent state, resulting in parts of consistent quality.

    03

    Save plastic raw materials

    There is no production waste in the pure hot runner mold because there is no cold runner.

    04

    Beneficial for production automation and efficiency

    The finished product is formed by hot runner molds, without the need for trimming gates or recycling cold runners. Beneficial for production automation.

    Frequently Asked Questions (FAQ)

    What is production tooling in plastic injection molding?
    Production tooling refers to highly durable molds designed to withstand the rigorous demands of high-volume mass production. Built with premium raw materials and precise machining, these tools can run hundreds of thousands or millions of cycles while maintaining tight tolerances.
    What types of injection molds can you manufacture?
    We specialize in a wide range of molds, including single-color molds, double-color molds, overmolds (two-shot molding), insert molds, and automatic thread-removing injection molds. We work with both cold runner and hot runner systems.
    Why is mold design so critical to product quality?
    Excellent mold design ensures that the mold cavities are completely filled in the shortest time possible while maintaining stable, repeatable dimensional tolerances. It also includes optimized cooling channel layouts to help the tool withstand thermal stress over millions of cycles.
    How do you choose the right tool steel for a mold?
    The steel choice (such as S136, P20, NAK80, or H13) depends on your project's production volume, part surface finish requirements, the type of plastic resin injected, and design complexity. Our design team helps select the ideal material to balance cost and longevity.
    What are the main advantages of using hot runner systems?
    Hot runner systems offer shorter molding cycles by eliminating gating cooling limits, improve part quality through uniform melt temperatures, save raw materials by eliminating cold runner waste, and facilitate full production automation since no gate trimming is required.

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