Injection Molding  Manufacturers, Traders, Suppliers

• Choice of material (TPU, PA, POM, ABS, PE, etc.): It all depends on the chemical and physical conditions to which the parts are exposed. With our own toolmaking, mouldmaking and design departments, we can offer you a full service.
• Numerous potential applications: Our ester and ether materials are very hardwearing and flexible and are used in applications with the toughest mechanical demands, e.g. sowing and sifting systems.
• Two components: A glass fibre-reinforced material plus a soft inner coating result in products that can be used as loadbearing parts, for example. Such parts would be inconceivable without precise planning plus development and test phases.
• Test samples: Before ordering an injection mould, we often produce samples for approval using laser sintering or 3D printing to avoid the need to invest in a mould at this stage. Our machines can produce injection-moulded parts weighing between 5 and 6000 g.

In our fully automated injection moulding production we work with roboter handling systems. Our machines are equipped with clamping force of 30 -1100 tons.
We produce injection moulded parts out of all thermoplastics. (1 component, 2 component and multi component injection moulding)

Automotive parts
Cosmetic bottles and cap
plastic gear
electronic boxes
keyboards
home appliance
Coffee machine
Inudstrial parts

Processing : Plastic injection molding
Mold steel : STAVAX S136 , 1.2343 , 1.2312 , 738H ,
Hardness : 36HRC - 54HRC
Mold component : Hasco , Meusburger , Rabourdin , LKM

Automotive parts
Cosmetic bottles and cap
plastic gear
electronic boxes
keyboards
home appliance
Coffee machine
Inudstrial parts

Injection Molded Parts are components produced by injecting molten plastic material into a precision mold, allowing it to cool and solidify, and then ejecting the finished part from the mold. This process is widely used for manufacturing high-precision, complex-shaped plastic components with consistent quality, especially suitable for mass production.
Key characteristics include:

• High Precision: Capable of achieving tight tolerances (e.g., ±0.01mm for precision molds).
• Design Flexibility: Enables intricate details, thin walls, and integrated features (screws, clips, ribs).
• Material Versatility: Compatible with thermoplastics (e.g., ABS, PC, PP) and thermosets (e.g., epoxy, phenolic).
• Cost Efficiency: Low per-unit cost for high-volume production, despite high initial mold investment.

1. Injection Molding Processes

• General Injection Molding:

• Standard process for most plastic parts, using single-cavity or multi-cavity molds (e.g., household appliances, automotive components).

Precision Injection Molding:

• Strict control over temperature, pressure, and cooling to achieve tight tolerances (e.g., medical devices, optical lenses).

Overmolding/Insert Molding:

• Molding plastic around inserts (metal, glass, or another plastic) to create composite parts (e.g., handles with metal cores, electrical connectors).

Two-Shot/Multi-Color Molding:

• Uses rotating molds to inject multiple materials or colors in a single cycle (e.g., mobile phone cases, automotive interior trims).

Gas-Assisted Injection Molding:

• Injecting gas into the molten plastic to reduce weight and internal stresses (e.g., automotive door panels, large housings).

2. Materials

• Thermoplastics:

• Commodity Plastics: PE, PP, PS – low cost, widely used for consumer goods.
• Engineering Plastics: ABS, PC, PA – higher strength, heat resistance (e.g., electronics, automotive).
• High-Performance Plastics: PEEK, PTFE, PSU – for extreme environments (medical, aerospace).

Thermosets:

• Epoxy, Phenolic – rigid, heat-resistant, non-recyclable (e.g., electrical insulators, circuit boards).

3. Design Considerations

• Wall Thickness: Uniform thickness (typically 0.5–4mm) to avoid sink marks and ensure proper cooling; thin walls for lightweighting.
• Gate Design: Location and type (edge, point, hot runner) affect material flow and part quality.
• Draft Angle: 1–3° on vertical surfaces to facilitate mold ejection and prevent surface scratches.
• Ribs and Bosses: Reinforce structural strength without increasing wall thickness.
• Shrinkage: Material-dependent (e.g., PE shrinks ~2%, PC ~0.5%) – critical for mold dimension calculations.

4. Mold Design & Engineering

• Mold Materials: Stainless steel (corrosion resistance), tool steel (high hardness for long life).
• Cooling System: Channels in the mold to control solidification rate and reduce cycle time.
• Ejection System: Pins or plates to remove parts from the mold without damage.
• Flow Analysis: CAE tools (e.g., Moldflow) to simulate plastic flow and optimize design.

5. Quality Control

• Dimensional Inspection: CMM, calipers, gauges to check tolerances.
• Surface Defects: Visual inspection for sink marks, warpage, flash, or color inconsistencies.
• Mechanical Testing: Tensile strength, impact resistance, hardness (Shore/ASTM tests).
• Material Compliance: RoHS, FDA (for medical), or UL (for electrical safety) certifications.

1. Consumer Electronics

• Device housings: Smartphones, laptops, tablets (PC/ABS for strength and aesthetics).
• Components: Keyboard keys, camera lenses, USB connectors (precision molding for tight tolerances).
• Accessories: Headphone cases, wearable device frames (overmolding for soft-touch finishes).

2. Automotive Industry

• Interior parts: Dashboard panels, door trims, center consoles (PP/ABS for cost and durability).
• Exterior components: Bumpers, side mirrors (PC/ASA for weather resistance).
• Functional parts: Fuel injection components, sensor housings (PA/PEEK for heat resistance).

3. Medical & Healthcare

• Disposable devices: Syringes, IV connectors, test tubes (PP/PS for biocompatibility, ISO 10993 compliance).
• Implants: Temporary prosthetics, orthopedic components (PEEK for radiolucency and strength).
• Diagnostic equipment: Microfluidic chips, labware (precision molding for complex fluid channels).

4. Packaging Industry

• Bottles and containers: PET for beverages, HDPE for detergents (injection blow molding).
• Caps and closures: Child-resistant lids, tamper-evident seals (PP for flexibility).
• Custom packaging: Cosmetic jars, food trays (thermoforming often paired with injection molding for inserts).

5. Industrial Equipment

• Mechanical parts: Gears, pulleys, bearings (PA/POM for low friction and wear resistance).
• Electrical components: Insulators, terminal blocks (thermosets for fire resistance).
• Tooling: Jigs, fixtures, and prototypes (3D-printed molds for low-volume production).

6. Aerospace & Aviation

• Lightweight components: Interior panels, ducting systems (PEI/PMI for high strength-to-weight ratio).
• Avionics: Circuit board housings, connectors (PSU for flame retardancy).

7. Toys & Recreation

• Toy parts: Action figures, building blocks (ABS/PP for safety and impact resistance).
• Sports equipment: Helmets (PC for impact resistance), golf club grips (TPU for grip texture).

Material: PP, ABS, PC, ABS+PC, Nylon, delrin (POM), PMMA, AS, PS, PE, PET, PVC, PEEK, etc; GF added material (ABS+GF, PA66+GF, PA666+GF); Rubber like material (TPE, PU, NBR, silicone, NBR+TPE etc)
Special specification available depend on different material and requirement: scracth resistant, flame resistant, UV resistant, food grade, chemical resistant, etc.
Sizes: All size and thickness available.
Process: Injection molding, overmolding.
Surface finish: texture (VDI/MT standard, or made to client's sample), polished (high polish, mirror polish), smooth, painting, powder coating etc.
Colors: clear (standard clear or high optical clear), semi-transparent, other colors (pantone code #, or made to client's sample).
Application: household commodities, electronics, car parts OME & Performance, motorcycles, bikes, machinery parts, hospital, cosmetics, Military and Aerospace etc.

SHJIA production is in full accordance with the IS09001 standard.The company introduced advanced processing and testing equipment and quality management systems to control every aspect from design to prduction and acceptance.The ultimate customer satisfaction is on SHIJIA's consistent quality.After mold design,we record the CAD,data,and then start making the mold. We are using the CMM equipment and electronic measuring instument for inspection.All in strict accordancewith standard quality control procedures by SHIJIA's experienced staff to ensure that the products meet every detailed requiirements from customers.

Application: household commodities, electronics, car parts OME & Performance, motorcycles, bikes, machinery parts, hospital, cosmetics, Military and Aerospace etc.

Two-color molding, plastic overmolding, Silicone rubber

overmolding, Silicone, rubber, nylon, PBT,PMMA,PEEK

Home appliance shells, industrial equipment

Plastic injection molding is a mainstream plastic processing technology. It injects molten plastic into mold cavities at high pressure via an injection molding machine, which is then cooled and solidified before demolding to get parts of specific shapes. Using plastic pellets as raw material, its process includes five steps: raw material drying, melting and plasticizing, high-pressure injection, cooling and solidification, and demolding. It features high efficiency, high precision, wide material adaptability and low mass production cost.

The core advantages of plastic injection molding lie in high mass production efficiency, stable precision, and controllable costs. Suitable for large-scale production, it meets the needs of complex structures and diverse performance requirements, making it the preferred process for mass manufacturing of plastic products.Specific Advantages

Plastic injection molding products are widely used across industries, including automotive manufacturing, consumer electronics, home appliances and furniture, medical and healthcare, packaging containers, industrial machinery, building materials, and maternal and infant toys, meeting the demand for high-volume, high-precision plastic parts.Core Application Industries and Typical Products

Our company has been in existence for more than 18 years
We specialize in designing and manufacturing various plastic mold and products
We have more than one hundred injection molding machines and have a professional team. we can make injection mold, die-casting mold, dual injection mold, stamping mold.
we have a very experienced production team, quality control team, can provide you with high quality products and good delivery.