Plastic Injection Molding

China Custom Plastic Injection Molding Parts Expert and Manufacturer

Our Equipment

Injection Molding Machines:

9 Injection Molding Machines (90T to 850T)

CNC Machining Machines:

3 Horizontal Machining Centers, including a double-station horizontal machining center
4 Gantry Machining Centers, 2 of which are equipped with side milling heads
7 CNC Vertical Machining Centers
8 CNC Lathes

Our Injection Molding Capability

Regular Injection Molding
Dual Shot Injection Moulding
Insert Molding
Overmolding

Available Processes

Maximum Part Weight: 5 kg
Threaded Parts: capable of producing parts with internal and external threads

Production Capability

Injection Molding Materials

At CEX Casting, we use a wide range of high-quality materials to meet the diverse needs of injection molding applications. Whether for general use or specialized engineering components, we ensure that the right material is selected for optimal performance and durability.

Common Materials: PP, PVC, PS, PE, HIPS, PET, ABS, POM, PMMA, etc
Engineering Plastics: PC, PA66, PBT, LCP, POM, PA6, PETG, TPE, etc
Specialty Plastics: PEEK, PMMA, TPU, EVA, ABC, PPS, TPI, PI, etc

Injection Molding Surface Treatment

Polishing: enhancing the surface finish of molded parts, providing a smooth and glossy appearance

Chrome Plating: enhancing the durability, hardness, and visual appeal of the surface

Texturing: creating patterns or rough surfaces on injection molding parts to improve grip, appearance, or functionality

Laser Marking: engrave permanent markings or logos on small or intricate parts

Screen Printing: printing logos, labels, and other graphics to the surface of injection molding parts

Mold Develpoment

In-house Mold Design: providing in-house mold design and manufacturing services, ensuring high-quality, customized molds tailored to your production requirements.
Mold Flow Analysis: conducting mold flow analysis to identify potential issues before production, optimizing the mold design for better efficiency and quality.
Low Mold Cost: starting from $1000, delivering high precision and durability while keeping your project within budget.
Free Mold Maintenance: providing free mold maintenance and retooling services to ensure the longevity of your molds and avoid costly production interruptions.

Why Choose Us

✔ Customization: delivering injection molding parts tailored to unique designs and requirements.

✔ Fast Response: dedicated support ensures timely communication and rapid resolution.

✔ Rapid Delivery: streamlined injection molding processes enable on-time production and delivery.

✔ Small Batch Support: flexible solutions for prototyping and limited production runs.

✔ Transparent Pricing: factory-direct costs with no hidden fees, ensuring cost-effective solutions.

✔ Quality Assurance: certified manufacturer and strict quality inspections guarantee reliable parts.

✔ Material Versatility: expertise in selecting and processing a wide range of plastics for optimal performance.

✔ Integrated Service: from in-house mold design to the final part, we manage every step of the process.

Our Quality Control

ISO 9001 and IATF 16949 certified manufacturer, highlighting our commitment to precision, consistency, and excellence in producing injection molding components.

Inspection Instruments

Our advanced inspection tools ensure accurate measurements, dependable material quality, and superior performance of the injection molding parts we deliver.

Coordinate Measuring Machine (CMM) with a measurement range of 800×1200×600 (mm) and a Maximum Permissible Error (MPE) of 3.0μm
Video Measuring System(VMS)
Tensile Strength Testing Machine
Digital Height Gauge, 0-600 (mm)
Full Range Vernier Caliper, 0-100-150-200-300-600-1000 (mm)
External/Internal Micrometers, 0-25-75-100-125-150 (mm) / 12-20-50-100 (mm)
Full Range Pin Gauge/Gauge, 0.5-12 (mm) / 1.0-100 (mm), with a spacing of 0.01mm

Inspection Process

Mold Inspection: regularly checks mold condition to prevent defects and maintain consistent precision in part production
First and Final Article Inspection: ensures consistent quality and dimensional accuracy throughout the entire batch
In-process Monitoring: conducts periodic checks during production to quickly identify and correct any deviations
Surface Finish Validation: ensures textures and coatings meet design specifications for functionality and appearance
Dimensional Reports: provides precise measurements of critical dimensions to ensure compliance with design tolerances

Our Cases

Part Name: Door Handle

Material: ABS

Industry: Automotive

Feature: High Impact Resistance and Excellent Surface Finish

Part Name: Battery Housing

Material: PP

Industry: Automotive

Feature: Flame-retardant and Lightweight

Part Name: Laptop Enclosure

Material: ABS

Industry: Electronics

Feature: Chemical and Wear Resistance

Part Name: Gears

Material: Nylon (PA66)

Industry: Industrial Machinery

Feature: High Mechanical Strength and Wear Resistance

Part Name: Medical Parts

Material: PC

Industry: Medical Equipment

Feature: Durable and Heat Resistance

Part Name: Power Tool Housing

Material: PC+ABS

Industry: Power Tools

Feature: Toughness and Impact Resistance

Related Knowledge

What is Injection Molding?

Injection molding is a manufacturing process that involves injecting molten plastic into a mold to produce parts with complex shapes and tight tolerances. It is one of the most popular methods for producing large volumes of plastic components efficiently and consistently.

Key Steps:

Material Preparation: plastic pellets are fed into a heated barrel, where they are melted and homogenized into a fluid state.

Injection: the molten plastic is injected under high pressure into a metal mold cavity, which defines the part’s shape.

Cooling: the plastic cools and solidifies in the mold, retaining the precise shape of the cavity.

Ejection: the mold opens, and the finished part is ejected using pins or plates. The part is then ready for post-processing if required.

Advantages of Injection Molding:

High Production Efficiency: suitable for large-scale manufacturing with fast cycle times.

Design Flexibility: capable of producing intricate geometries, thin walls, and complex shapes.

Material Versatility: supports a wide range of plastics, including thermoplastics, thermosets, and elastomers.

Low Waste: material waste is minimal due to precise molding and recyclability of excess plastic.

Consistency: provides uniform quality and tight tolerances for every batch.

What Are the Common Defects in Injection Molding and How to Prevent Them?

Injection molding, while highly efficient, can sometimes result in defects due to material, process, or mold issues. Here are some common defects and their solutions:

Short Shots:

Causes: insufficient injection pressure, low material temperature, or inadequate venting.

Prevention: increase injection pressure, raise the material temperature, and ensure proper venting in the mold design.

Warping:

Causes: uneven cooling, material shrinkage, or improper mold design.

Prevention: optimize mold cooling channels, use materials with lower shrinkage rates, and ensure uniform wall thickness in the design.

Sink Marks:

Causes: uneven cooling or insufficient packing pressure.

Prevention: increase packing pressure, ensure uniform cooling, and adjust wall thickness for consistency.

Flow Lines:

Causes: low material temperature, slow injection speed, or mold surface imperfections.

Prevention: raise material temperature, increase injection speed, and ensure the mold surface is smooth.

Flash:

Causes: excessive injection pressure, worn mold components, or poor clamping.

Prevention: lower injection pressure, inspect and maintain the mold regularly, and ensure proper clamping force.

Types of Injection Molding and Their Advantages

Standard Injection Molding:

Description: a single material is used to create parts in one injection cycle.

Advantages:

Cost-effective for high-volume production.
Ideal for simple and uniform designs.
Consistent quality with minimal waste.

Dual Shot Injection Molding:

Description: two different materials or colors are injected into a mold in two stages to create a single part.

Advantages:

Allows for hard-soft material combinations, such as rigid housings with soft grips.
Reduces assembly time by producing multi-material parts in one step.
Enhances aesthetic appeal with dual-color designs.

Insert Molding:

Description: combines pre-fabricated inserts (like metal components) with plastic during the molding process.

Advantages:

Adds strength, conductivity, or fastening features to the part.
Reduces assembly time by integrating multiple components into one.
Suitable for applications like threaded parts and electronic connectors.

Overmolding:

Description: a secondary layer of material is molded over an existing part to enhance functionality or aesthetics.

Advantages:

Provides improved grip, protection, or insulation.
Creates ergonomic designs, such as tool handles or medical devices.
Enhances durability and visual appeal.