HWPD is a professional medium and large plastic injection molding manufacturer in China with over 20 years of industrial manufacturing experience. Our injection molding production facility operates 60 dedicated injection molding machines — spanning clamping forces from 120 tons to 1,500 tons — giving us the capacity to handle small precision components and large structural automotive parts within the same production environment.
We provide customised plastic injection molding services for a broad range of industries, delivering consistent dimensional quality, stable process parameters, and efficient production cycles that meet the requirements of demanding OEM supply chains across the automotive, medical, communication, and consumer electronics sectors.
Automotive Plastic Parts | Large Structural Components | Precision Industrial Parts |
Medical Device Housings | AI & Communication Equipment | Consumer Electronics Parts |
Injection Molding Production Capability
Our plastic injection molding facility is purpose-built for medium-to-high volume production of complex plastic parts. The breadth of our machine fleet — from 120-ton units for small precision components to 1,500-ton presses for large automotive body panels — allows us to serve a complete range of part sizes within a single supplier relationship.
60 injection molding machines | 120T to 1,500T clamping force | 20+ years of production experience Our production floor supports small, medium, and large plastic parts in a single facility — reducing supplier complexity and ensuring consistent quality standards across all component sizes. |
Machine Class | Clamping Force | Typical Applications |
Small / Precision | 120T – 300T | Precision instrument components, small connectors, medical device inserts, electronic housings |
Medium | 300T – 650T | Automotive interior trim, HVAC components, communication equipment shells, industrial functional parts |
Large | 650T – 1,200T | Automotive door panels, instrument panels, engine peripheral parts, large equipment housings |
Extra Large | 1,200T – 1,500T | Automotive bumpers, fenders, wheel arches, large exterior body components |
Injection Molding Workshop
Our injection molding workshop maintains a clean, well-organised production environment aligned with automotive-grade manufacturing standards. All machines are operated by experienced technicians, with process parameters documented and monitored throughout each production run to ensure part-to-part consistency and process traceability.
HWPD plastic injection molding workshop — 60 machines covering 120T to 1,500T clamping force (KAWAGUCHI KX200-JS shown)
Advanced Injection Molding Technologies
Beyond standard injection molding, HWPD's production facility supports a comprehensive range of advanced plastic forming technologies. These processes allow us to produce complex, multi-material, and decorated parts in a single production cycle — reducing assembly operations, improving cosmetic quality, and enabling more cost-effective finished component supply.
Overmolding Two-material bonding in a single production cycle — combining hard structural substrates with soft-touch TPE or TPU overmold layers for ergonomic handles, seals, and grips. | Two-Shot (2K) Molding Sequential injection of two different plastic materials in one machine cycle — producing complex multi-material parts without secondary assembly or bonding operations. | In-Mold Decoration (IMD) Integrating surface graphics, textures, or functional films within the injection mold — eliminating post-molding painting or printing for durable, scratch-resistant decoration. |
In-Mold Labeling (IML) Embedding pre-printed labels or films inside the mold cavity during injection — producing parts with permanent, subsurface-quality surface graphics in one production step. | Gas-Assisted Injection Molding Injecting nitrogen gas into the melt to create hollow internal channels in thick-wall parts — reducing material usage, cycle time, and sink marks on visible surfaces. | Insert Molding Encapsulating metal inserts, threaded fasteners, or electronic components within the molded plastic part — creating strong, integrated assemblies without secondary operations. |
Secondary Processing & Finishing
Our injection molding service extends beyond the press to include a full range of secondary operations and surface finishing capabilities. This allows clients to receive completed, assembly-ready components rather than raw molded parts — further simplifying their supply chain.
▸ Clean-room spray painting and multi-coat finishing for automotive Class-A surfaces
▸ Pad printing, silk-screen printing, and hot stamping for surface graphics
▸ Ultrasonic welding and vibration welding for plastic assembly joining
▸ Heat staking and ultrasonic insertion of metal fasteners
▸ Laser engraving and laser welding for precision marking and assembly
▸ Sub-assembly and final assembly with component sourcing and coordination
▸ Custom packaging design and export packaging for direct market delivery
Our Plastic Injection Molding Process
Every injection molding production run at HWPD follows a structured workflow designed to validate process stability before full production release and maintain quality traceability throughout the run:
STEP 1 Part DFM & Process Review | STEP 2 Material Confirmation & Procurement | STEP 3 Mold Installation & Setup |
STEP 4 Process Parameter Development | STEP 5 First Article Inspection (FAI) | STEP 6 Customer Approval & Production Release |
STEP 7 Full Production Run | STEP 8 In-Process QC & Dimensional Check | STEP 9 Secondary Operations & Packing |
Quality Control & Inspection
Consistent quality in plastic injection molding depends on disciplined process control, not just final inspection. At HWPD, quality is built into the production process through documented parameter control, operator training, and systematic in-process measurement — backed by fully equipped inspection tools and dimensional reporting.
Plastic Injection Molding — Quality & Process Specifications | ||
Process Control | Inspection Equipment | Reporting & Certification |
• Documented process parameter records for each job • Real-time monitoring of melt temperature, injection pressure, and cycle time • Controlled material drying and handling protocols • Colour and appearance standard matching per client sample • Clean-room moulding available for medical and optical parts | • CMM (Coordinate Measuring Machine) for dimensional verification • Optical profile projectors and 3D scanners • Surface roughness measurement • Colour spectrophotometer for painted surface matching • Tensile and flexural strength testing | • First Article Inspection (FAI) report with full dimensional data • Material certification and traceability documentation • Process capability (Cpk) reporting on request • PPAP documentation for automotive supply chain • ISO-aligned quality management system |
Plastic Materials We Process
Our injection molding machines process the complete range of engineering, commodity, and specialty thermoplastics — including glass-fibre and mineral-filled structural grades commonly used in automotive applications:
PP | PP+GF | PP+MD | PA6 | PA6+GF30 |
PA66 | ABS | ABS+PC | PC | POM |
PBT | PBT+GF | TPE | TPO | TPU |
TPV | ASA | PMMA | PVC | PEEK |
Plastic Injection Molding Applications
Our injection molding services cover a wide range of industries and component types. The following are our primary application areas:
Automotive Exterior Bumpers, grilles, fenders, wheel arches, door handles, rearview mirror housings, lamp bezels, rain gutters — large structural parts produced on 650T–1,500T machines. | Automotive Interior Door panels, A/B/C pillars, instrument panels, centre consoles, glove boxes, air vent assemblies — Class-A surface and tight tolerance requirements. | Engine & HVAC Intake manifolds, air filter housings, heater box assemblies, coolant circuit components — high-temperature engineering plastics (PA+GF, PBT+GF). |
Medical Devices Diagnostic equipment housings, instrument enclosures, and structural medical device components — clean-room moulding with certified materials available. | AI & Communication Equipment AI device structural shells, communication equipment enclosures, server housing components, and precision electronic equipment structural parts. | Industrial & Consumer Robot vacuum cleaner bodies, smart home device housings, office automation equipment covers, industrial machinery guards and structural components. |
Trusted Injection Molding Partner for Global OEMs
HWPD has maintained long-term plastic injection molding supply relationships with world-renowned automotive manufacturers and their Tier 1 supply chains for over 20 years. Our production standards are calibrated to automotive OEM requirements — the most demanding in the industry — and applied consistently to all client accounts regardless of industry.
Volvo | BMW | Mercedes-Benz |
General Motors | Ford | Volkswagen |
Nissan | Honda | Toyota |
Panasonic |
Why Choose HWPD for Plastic Injection Molding
20+ years manufacturing experience | 60 machines: 120T to 1,500T | Small, medium & large parts |
Automotive OEM supply experience | Advanced molding technologies | Full secondary operations |
In-house CMM & QC inspection | PPAP & FAI documentation | IP protection & NDA standard |
▸ Single-source capability from mold fabrication through finished part production and secondary processing
▸ Automotive-calibrated process control and quality documentation (PPAP, FAI, Cpk) applied across all accounts
▸ 20+ year OEM supply track record: Volvo, BMW, Mercedes-Benz, GM, Ford, Volkswagen, Nissan
▸ In-house mold maintenance and engineering change capability — no delays from external tooling suppliers
▸ English-speaking project management for seamless international client communication and reporting
▸ Flexible batch sizes from pre-production samples through sustained high-volume mass production
