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Professional Plastic Injection Mold Manufacturing Factory in China | Top Suppliers for High-Volume Production Tooling

High-Quality Production Tooling Services in China

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At King Sjeng, we take pride in being one of the leading manufacturers and suppliers of tool-making and high-volume production services in China. Our advanced expertise in plastic injection molding enables us to support your most ambitious projects while ensuring exceptional quality. With our rigorous process control and positive material identification, we guarantee that hundreds of thousands or even millions of complex parts and assemblies are produced with consistent cycle times at the lowest possible cost per piece. As a certified ISO 9001 factory, we provide complete peace of mind for all your manufacturing needs.

    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: 2 sets

    Grinder: 2 sets

    Milling machine: 2 sets

    Milling machine: 2 sets

    High-Speed WEDM 2sets

    High-Speed WEDM 2sets

    Middle-speed WEDM 2 sets

    Middle-speed WEDM 2 sets

    Injection Mold Manufacturing-Main Machines

    EDM: 2 sets

    EDM: 2 sets

    Mirror EDM: 1 sets

    Mirror EDM: 1 sets

    EDM: 2 sets
    EDM: 2 sets
    CNC: 2 set

    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 1
    Mold making 2
    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 1
    Mold making 2
    Mold making 3

    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 injection molding?
    Production tooling refers to highly durable mold tools engineered to withstand continuous, high-volume mass production runs (often hundreds of thousands to millions of cycles) while maintaining strict dimensional tolerances.
    What types of molds can you manufacture?
    We specialize in single color molds, double color (bicolor) molds, overmolds (2-time molding), insert molds, and automatic thread-removing injection molds, utilizing both cold and hot runner configurations.
    How does mold design affect part quality?
    Mold design is the foundational factor of part quality. A precise design ensures cavities fill completely and quickly, while well-engineered cooling channels protect the tool from thermal stress and ensure uniform cooling for repeatable part accuracy.
    How do you choose the correct mold steel?
    The choice of tool steel (such as P20, NAK80, H13, S136) depends on your production volume requirements, the target surface finish of the part, the chemical properties of the injected resin, and the design's overall complexity.
    What are the primary cost factors of a production mold?
    The main cost drivers include the complexity of the design, the number of mold cavities, the grade of mold tool steel selected, the required surface treatments (polishing, plating, etc.), and the integration of hot runner systems.
    Why should I use a hot runner system in my mold?
    Hot runner systems offer shorter molding cycles, reduce plastic raw material waste by eliminating cold runners, improve consistency and quality of the melt distribution, and facilitate seamless production automation.

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