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Quality Plastic Injection Molding Services from Leading China Suppliers & Factory
Kingsjeng, one of the excellent injection molding service providers, provides one-stop solutions. We are not only skilled in single-color injection molding, but also in the injection molding of treaded products and secondary molding. Regardless of volume or complexity, our professional team is committed to providing high-level and satisfactory professional support for your injection molding needs.
1. RFQ
Your sparkling idea
2. Design & Optimization
Our designer will create Intuitive 3D data for your confirmation
3. Prototype Making
Prototype within touch, you can evaluate your idea more intuitively.
4. Design Review
Design for manufacturing can avoid risks and reduce costs.
5. Stable Production
Based on ISO system, built quality in the process.
6. Delivery
Packed well, delivered via sea, air or train.
What kind of injection molding services can we provide?
Our most advantageous injection molding service
Injection molding service
Our Plastic injection molding strength
Representative OEM injection molding products - by molding category
Single color Injection molding
Precision Component 01
Precision Component 02
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Precision Component 16
Sports Equipment Parts
Insert Injection molding
Insert Molded Component 01
Insert Molded Component 02
Insert Molded Component 03
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Overmold Injection molding
Overmolded Part 01
Overmolded Part 02
Overmolded Part 03
Treaded part Injection molding
Treaded Component 01
Treaded Component 02
2-color Injection molding
Charging Gun Part
Electrical Handle
Plastic Mobile Shell
Representative Products - The industries applicable to plastic products
Smart home appliances
Intelligent floor cleaning robot
Blender
Air fryer
Air fryer (Dual Pot)
Office equipment
Printer parts
Mini thermal printer parts
Teller terminal parts
Medical and health
Massage device
Heath care-Dental impactor
Heath care-forehead thermometer
Heath care-Blood pressure monitor
Beauty and skin care
LED makeup mirror
Hair dryer
Beauty and skin care
Internet of Things
Control box
Router
IoT box
Remote control
Security camera
New energy
Power Cover Drive Assembly
Auto parts
Charging pile components
Charging gun
Charging gun
Charging station parts
What is injection molding?
Plastic injection molding is the most efficient way to produce plastic parts in high volumes for commercial and industrial use. Molten resin is injected under high pressure into a metal mold, then rapidly cooled to form a solid part. Here is a schematic diagram of an injection molding machine.
The Plastic Injection Molding Process
Plastic injection molding is the process of filling a mold tool with liquid plastic resin under great pressure. The tool may comprise a single cavity or hundreds of cavities in order to make indefinite numbers of parts. Once the mold tools have been carefully designed and manufactured, the molding process consists of the following basic steps:
Step 1 – The plastic resin comes in raw pellets. These are dried to the right moisture content, and then if necessary they can be blended with pigments or master batch colorants to create the correct color for the design.
Step 2 – The dried pellets are poured into the hopper of the molding machine. A reciprocating screw inside the barrel of the machine is used to transport these pellets towards the mold while at the same time heating them.
Step 3 – Within the barrel, the pellets are mixed and heated until fully molten, forming the liquid resin.
Step 4 – The heated mold closes automatically and resin, under great pressure, is injected through a gate and into the mold cavity.
Step 5 – The mold is cooled in a short amount of time to solidify the part inside.
Step 6 – The mold opens and the part is ejected to begin a new cycle.
Advantages Of Plastic Injection Molding
There are many advantages to plastic injection molding. These include the ability to make large volumes of parts quickly, high surface quality, many resins to choose from, color flexibility, and durable tooling that can last for years.
Hundreds of resins to choose from
Economies of scale
Stable and repeatable
Excellent surface quality
Overmolding for more design options
Multi-cavity and family tools
Why can we do well in injection molding production?
Design For Manufacturing
As is well known, the design phase determines 80% of the manufacturing cost of a product. DFM considers manufacturability from the beginning of product development and design, closely linking design and manufacturing to achieve a one-time success from design to manufacturing. At KingSjeng, we will complete a personalized DFM based on your exact needs.
Plastic Injection Molding Materials
Choosing the right resins is extremely crucial for injection molding, as it affects many aspects such as product performance, quality, cost, and production efficiency. For example, suitable materials can ensure product strength meets standards, avoid defects, and optimize cost control.
Color Consistency
The color consistency of injection molded products is very important, as it ensures a coordinated and beautiful appearance, reflects quality, and enhances brand image. Consistent color of the outer shell of a batch of electronic products will give consumers a good visual experience and quality trust.
Visual Quality Standards
The highest visual quality inspection standards are used to verify your plastic injected molded parts.
A diligent and enterprising team
A professional and diligent team is crucial in improving efficiency, ensuring quality, overcoming challenges, driving your project towards success, and realizing your dreams as soon as possible.
Product Road mapping
Follow the product road mapping journey to save time, money and effort on your next project. It is beneficial for teamwork, smooth production and timely shipment.
Plastic Injection Molding Resources - A well-established supply chain
Frequently-used resins brands
Color master batch
Professional color master batch manufacturers with long-term cooperation in the local area can provide color master batch that meets environmental requirements and color consistency, with color standards based on Pantone or Ral.
Frequently-used resins
√ ABS, ASA, PS, AS, HIPS etc.
√ PP, PE, HDPE, UPE etc.
√ PA66, PA6, PA6T, PA9T, PA12, PA46 etc.
√ PC, POM etc.
√ PPE etc.
√ PET, PBT etc.
√ TPEE, TPE, TPV, TPU etc.
√ PARA, PMMA, PEEK, PES, PPSU, PEI, PPS etc.
Property of material
√ Carbon fiber reinforced, wear-resistant, conductive, thermal conductive, and high rigidity specifications.
√ Special composite: aramid AF, CF+GF, CF+TF, GF+TF, equal composite specifications.
√ Wide range wear resistance level: including wear resistance specifications such as SI, MoS, PTFE, nano modification, etc.
√ High dimensional stability (low moisture absorption, low warping, low shrinkage, low coefficient of thermal expansion).
√ Combination of conductivity, anti-static, electromagnetic shielding, and thermal conductivity.
Common surface treatments for plastic products
1. Painting: Can endow plastic products with rich colors and appearance effects, such as high gloss, matte, and metal texture.
2. Electroplating: Increase surface gloss and metal texture, improving wear resistance and corrosion resistance.
3. Printing: Including silk screen printing, pad printing and other methods for various patterns, logos and text.
4. Laser engraving: Capable of achieving fine patterns and marks with permanence and high precision.
5. Vacuum coating: Enables plastic surfaces to have decorative and functional properties, such as fingerprint resistance and UV protection.
6. Matte treatment: Gives surfaces a matte/rough texture, increasing anti-slip properties and reducing reflection.
7. Polishing: Improves surface finish to make components smoother and brighter.
8. Flocking: Attaches a layer of fluff to the plastic surface for a soft, comfortable touch.
Applications for Plastic Injection Molding
OEM
According to customers' needs, we produce the exact products required. The products cover many industries, such as small household appliances, electronics, healthcare, home furnishings, beauty care, etc.
ODM
After in-depth exploration of existing advantageous technologies and market demand research, we developed high-strength plastic materials for water pipe connectors in May 2022, which were widely recognized by customers.
The proportion of OEM and ODM in revenue
Frequently Asked Questions (FAQ)
1. What materials are commonly used in custom plastic injection molding?
We support a comprehensive range of engineering and commodity thermoplastic resins, including ABS, PP, PC, PA6/PA66 (Nylon), POM, PBT, TPU/TPE, PEEK, and PPS. We also handle composite reinforcements like glass fiber and carbon fiber.
2. How does Design for Manufacturability (DFM) assist my project?
DFM analysis evaluates wall thickness, draft angles, gate locations, and parting lines prior to tooling fabrication. This proactive review eliminates costly revisions, reduces tooling lead times, and guarantees defect-free production.
3. What is the difference between OEM and ODM injection molding?
OEM (Original Equipment Manufacturer) produces parts strictly based on your provided 3D designs and specifications. ODM (Original Design Manufacturer) involves our engineering team developing or co-optimizing both the product design and the manufacturing process.
4. How do you maintain color consistency across high-volume production batches?
We partner with professional masterbatch suppliers strictly calibrating to Pantone or RAL standards, using automated resin dosing and standardized visual spectrophotometer inspection to ensure 100% color uniformity.
5. What secondary surface finishings do you provide for molded plastic parts?
Our post-processing capabilities include spray painting, electroplating, vacuum metallization, silk-screen and pad printing, laser engraving, texture etching, flocking, and high-gloss polishing.
6. Can you accommodate both low-volume prototyping and mass production?
Yes, we provide rapid prototype tooling and single-cavity bridge tooling for initial testing, as well as high-cavity, hardened steel mold tooling capable of producing millions of units stably under ISO-certified quality controls.