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China Suppliers for Professional Plastic Injection Mold Manufacturing Services | ISO Certified Factory

High-Quality Production Tooling in China

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As a leading supplier in China, King Sjeng offers exceptional tool-making and high-volume production services tailored for your plastic injection molding projects. Our comprehensive process control and commitment to positive material identification guarantee the production of hundreds of thousands to millions of intricate parts and assemblies, all with consistent cycle times and the most competitive cost per piece. Our factory is independently certified to ISO 9001 standards, ensuring you can have complete peace of mind with each product we deliver.

    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: 2 sets
    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 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;
    • Number of cavities;
    • Mold tool steel;
    • Surface treatment of the mold (polishing, plating, vapor deposition, etc.)
    • 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

    Frequently-used hot runner system
    Plastic Mold Manufacturing detail

    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

    What is production tooling in manufacturing?
    Production tooling refers to robust plastic injection molding tools engineered to meet the demands of high-volume mass production. They maintain tight dimensional tolerances and are built using premium raw materials and precise machining to withstand hundreds of thousands or millions of cycles without degradation.
    What types of molds can you process?
    We have the capabilities to process single color molds, double color (bicolor) molds, overmolds (2-time molding), insert molds, and automatic thread-removing injection molds. We can build these using either cold runner or hot runner configurations.
    What tool steels do you commonly use for mold making?
    We use a wide variety of qualified tool steels depending on the production volume and part requirements. Our frequently-used steels include S136, 2316, 718S, PAK90, 420, P20, NAK80, and H13.
    Why is mold design so critical to product quality?
    Mold design is the foundational factor affecting the final part quality. A well-designed mold ensures that cavities are filled in the shortest time, maintains repeatable tolerances, and incorporates efficient cooling channels to withstand thermal stresses over long production runs.
    What are the main advantages of using a hot runner system?
    Using a hot runner system offers four major benefits: it shortens the molding cycle, improves overall product quality through uniform temperature control, saves plastic raw materials by eliminating cold runners, and facilitates production automation.
    What main machinery is utilized in your mold manufacturing workshop?
    Our facility is equipped with precision machinery including CNC machining units, EDMs (including Sodick mirror EDMs), grinders, milling machines, and both high-speed and middle-speed WEDM systems to guarantee high-precision mold processing.

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