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Injection Molding
With over 90 injection molding machines ranging from 80T to 1300T, we cover the production of precision small parts, medium- and large-sized structural components, two-shot injection molding, and mass production needs, providing our customers with stable, efficient, and sustainable support for the mass production of plastic parts.
We don't only build to print. If your product is still at the concept stage, Hongqing's R&D team provides OEM/ODM product development support: industrial design, mechanical and electronics engineering, then tooling and mass production, all by one team.
Learn about product development →OEM/ODM services →8 stages from idea to mass production
- 01Concept evaluation and product definition
- 02Product Design & Engineering
- 033D-printed / CNC prototypes
- 04In-house mold making (±0.01 mm)
- 05Mold trial and sample approval
- 06Injection molding (90+ presses)
- 07Surface finishing (2 robotic painting lines)
- 08Clean-room assembly & shipping
- ISO 9001
- ISO 14001
- IATF 16949
- BSCI · Sedex
- 18-person QC team
- In-house mold shop, ±0.01 mm
- 90+ injection molding machines
- 20,000 m² factory
What is injection molding?
Injection molding is the core process for the mass production of plastic products. By heating and melting plastic raw materials and then injecting them into a mold cavity, followed by cooling and shaping, plastic parts with stable dimensions, consistent appearance, and reliable structure are produced.
In the manufacturing of plastic products, injection molding not only determines whether a product can be mass-produced, but also directly affects dimensional accuracy, surface finish, assembly quality, production efficiency, and delivery reliability. Hongqing operates more than 90 injection molding machines ranging from 80T to 1300T, including more than 40 medium- to large-sized machines rated at 300T or higher. Equipped with machinery from renowned domestic and international brands such as Sumitomo, Haitian, and Kawaguchi, the facility can meet a wide range of injection molding needs, from precision small parts to large structural components.
Hongqing's Injection Molding Capabilities
Injection molding is a core component of Hongqing’s manufacturing system. We have a comprehensive portfolio of injection molding equipment, an experienced process team, and robust mass production management capabilities, enabling us to flexibly match the appropriate injection molding equipment and production solutions based on different product dimensions, materials, structures, aesthetic requirements, and order sizes.
Comprehensive coverage of injection molding equipment across all tonnage ranges
Hongqing is equipped with more than 90 injection molding machines ranging from 80T to 1300T, covering the molding needs for small precision parts, medium-sized structural parts, and large plastic parts. Whether it’s consumer electronics housings, home appliance components, automotive parts, or industrial plastic structural parts, we can match the appropriate tonnage of equipment based on the product’s dimensions and structural characteristics.
- More than 90 injection molding machines with capacities ranging from 80T to 1300T
- Covers precision small parts, medium-sized structural components, and large plastic parts
- More than 40 medium- and large-sized injection molding machines with capacities of 300T or more
- Can meet order requirements for multiple product categories, sizes, and batch sizes
Injection Molding Capabilities for Medium- to Large-Sized Plastic Parts
For products such as large structural components, industrial enclosures, home appliance housings, and automotive parts, Hongqing is equipped with multiple medium- to large-sized injection molding machines rated at 300 metric tons or more, as well as a machine with a maximum capacity of 1,300 metric tons. The company is capable of undertaking molding projects for plastic parts that are large in size, structurally complex, and require high stability.
- Equipped with a 1300T large-capacity injection molding machine
- Supports the production of medium- to large-sized plastic housings and structural components
- Suitable for products such as industrial enclosures, home appliance components, and automotive parts
- Compatible with large-scale mold manufacturing capabilities for molds up to 1.5 meters in size
Precision Injection Molding Capabilities
For plastic parts that require high dimensional accuracy, strict assembly specifications, and consistent appearance, Hongqing achieves stable molding through the use of injection molding equipment imported from Japan, precise control of process parameters, and optimized mold design. We address common injection molding issues such as shrinkage, warpage, flash, weld lines, color variations, and dimensional deviations to ensure long-term, stable product delivery.
- Suitable for precision housings, functional parts, assemblies, and structural components
- Control molding issues such as shrinkage, warpage, flash, and color variation
- Ensure dimensional stability, consistent appearance, and reliable assembly of the product
- Suitable for projects in consumer electronics, 3C products, smart hardware, and more
Two-Shot Injection Molding Capabilities
Hongqing has 7 two-shot computer-controlled injection molding machines capable of producing two-shot injection-molded parts, hard-over-soft molding, two-shot cosmetic parts, and functional overmolded parts. Two-shot injection molding enhances a product’s visual appeal, tactile feel, slip resistance, sealing performance, and structural integration. It is suitable for products such as electronic device housings, handles, buttons, waterproof components, and tool accessories.
- Equipped with 7 two-shot computer-controlled injection molding machines
- Supports two-shot injection molding, hard-over-soft overmolding, and functional overmolding
- Suitable for products requiring slip resistance, water resistance, sealing, and improved tactile feel
- This can reduce the need for subsequent assembly and improve overall product consistency.
Vertical Injection Molding and Insert Molding
Hongqing is equipped with vertical injection molding machines, which can be used for insert molding, metal overmolding, terminal overmolding, partial overmolding, and the molding of special structural components. For products that require the integration of metal parts, nuts, terminals, or other components with plastic, vertical injection molding can improve the stability of the bond and enhance assembly efficiency.
- Equipped with 5 vertical injection molding machines
- Supports insert molding, metal overmolding, and terminal overmolding
- Plastic products suitable for use with nuts, metal parts, and fasteners
- Improve structural stability and streamline subsequent assembly
Equipment from well-known domestic and international brands
The company’s injection molding workshop is equipped with machinery from renowned domestic and international brands such as Sumitomo, Haitian, and Kawaguchi. Combined with robotic arms, automated auxiliary equipment, and a team of professional injection molding technicians, this setup enhances production stability, efficiency, and consistency.
- Equipped with injection molding machines from brands such as Sumitomo, Haitian, and Kawaguchi
- Computer-controlled robotic arms assist in production, improving efficiency and consistency
- On-site Machine Setup and Process Control by Professional Injection Molding Technicians
- Supports long-term, stable, high-volume production
Experience in multi-material injection molding
Based on a product’s intended use, structural requirements, aesthetic appearance, and operating environment, Hongqing works with customers to select the appropriate plastic materials and completes the corresponding injection molding process debugging. This service applies to projects involving common engineering plastics such as ABS, PC, PP, PA, POM, TPE, and TPU, as well as soft rubber materials.
- Supports injection molding of a wide range of common plastic materials
- Select materials based on strength, temperature resistance, toughness, appearance, and cost
- Suitable for a variety of applications, including hard rubber, soft rubber, transparent parts, and wear-resistant parts
- Process optimization can be carried out in conjunction with the product structure
Seamless Transition from Prototyping to Mass Production
Hongqing offers integrated mold manufacturing and injection molding capabilities, allowing projects to quickly move from mold completion to trial runs, sample approval, problem optimization, and mass production. The close collaboration between the mold and injection molding teams reduces the time customers spend coordinating back and forth between the mold shop and the injection molding facility.
- Coordination between the in-house mold shop and the injection molding workshop
- Support for mold trials, sample approval, problem optimization, and mass production ramp-up
- Quickly resolve mold trial issues such as shrinkage, flash, warpage, and assembly problems
- Improve overall efficiency from mold development to mass production
Integrated Support for Surface Treatment and Assembly
After injection molding is complete, Hongqing can provide follow-up services such as spray painting, screen printing, pad printing, UV printing, laser marking, conductive paint spraying, heat staking of nuts, insert assembly, cleanroom assembly, and packaging and shipping, helping customers complete the entire process from plastic parts to finished products.
- After injection molding, processes such as spray painting, screen printing, pad printing, and UV printing can be performed.
- Supports laser marking, conductive paint spraying, and cosmetic and functional surface treatments
- We offer hot-press nuts, insert assembly, and complete machine assembly
- Reduce the number of supplier integrations and improve delivery efficiency
Frequently Asked Questions
Yes. Hongqing has more than 90 injection molding machines ranging from 80T to 1300T, including over 40 medium- to large-sized machines rated at 300T or higher, as well as a 1300T large-scale injection molding machine. The company is capable of undertaking injection molding projects for large structural components, industrial enclosures, home appliance components, automotive parts, and other medium-to-large-sized plastic injection molding projects.
Yes. Hongqing has in-house mold manufacturing and injection molding capabilities, ensuring stable product dimensions, consistent appearance, and reliable assembly through precision molding, optimized molding parameters, material selection, and production process control. This makes it well-suited for precision plastic parts projects in consumer electronics, 3C products, smart hardware, and home appliance components.
Yes. Hongqing has seven two-shot computer-controlled injection molding machines capable of producing two-shot injection-molded parts, hard-over-soft molding, functional overmolding, anti-slip components, waterproof components, and two-shot cosmetic parts. These machines are suitable for manufacturing electronic product housings, buttons, handles, tool accessories, and other plastic products that require the combination of multiple materials.
Yes. Hongqing is equipped with vertical injection molding machines that can be used for insert molding, metal overmolding, terminal overmolding, nut insertion, and the molding of special structural components. They are suitable for product projects that require the integration of metal and plastic parts.
Yes. After injection molding, Hongqing can provide additional services such as spray painting, screen printing, pad printing, UV printing, laser marking, conductive paint spraying, heat staking of nuts, insert assembly, cleanroom assembly, and packaging and shipping, helping customers achieve one-stop delivery from plastic parts to finished products.
Hongqing’s injection molding services are suitable for projects in the consumer electronics, smart hardware, home appliances, automotive parts, industrial enclosures, 3C products, outdoor gear, maternal and infant products, and various plastic structural components sectors. Whether it’s precision small parts, medium- to large-sized enclosures, or two-shot overmolded products, we can provide tailored solutions based on your project requirements.
Customers can provide 3D drawings, 2D engineering drawings, product samples, material specifications, surface treatment requirements, assembly requirements, and order quantities. If the information provided is incomplete, Hongqing can also assist with structural evaluation, mold design analysis, and injection molding process recommendations.
Ready to get started on your injection molding project?
Whether you need precision small parts, medium- to large-sized plastic parts, two-shot injection molding, insert molding, or post-processing and final assembly, Hongqing can provide you with stable and efficient mass production support for injection molding, backed by more than 90 injection molding machines, a 1,300-metric-ton large-capacity injection molding machine, 7 two-shot injection molding machines, and a comprehensive one-stop manufacturing system.
Injection Molding at a Glance
| Presses | 90+ injection molding machines, 80T – 1300T |
|---|---|
| Large tonnage | 40+ presses at 300T and above; max 1300T |
| Two-shot (2K) | 7 two-shot injection molding machines |
| Insert molding | Vertical presses for metal inserts, terminals and overmolding |
| Equipment brands | Sumitomo, Haitian, Kawaguchi, with robotic part removal |
| Materials | ABS, PC, PP, PA (nylon), POM, TPE, TPU and other engineering plastics |
| Volumes | Pilot runs and small batches through high-volume mass production |
| Downstream | Painting, printing, laser marking, heat staking, assembly and packaging in-house |
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