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The automotive landscape is shifting rapidly toward electric vehicles (EVs), autonomous driving systems, and highly integrated smart cabins. This evolution demands advanced manufacturing methodologies that combine aesthetics, functionality, and lightweighting.
In modern automotive design, Multi-Colour Injection Moulding (also known as multi-shot, 2K, or co-injection molding) has transitioned from a premium manufacturing option to an essential industrial standard. By injecting two or more different materials or colors into a single mold during a single cycle, Tier 1 suppliers can eliminate secondary assembly steps, reduce labor costs, and achieve impeccable tolerances that are impossible with traditional mechanical bonding.
The global demand for custom automotive plastic component tooling is driven by the need for multi-functional parts. Integrated light guides, soft-touch buttons, dual-material seals, and acoustic dampers are now produced in a single manufacturing cell. This not only enhances the tactile and visual quality of the car's interior but also contributes significantly to weight reduction, directly extending the driving range of modern electric vehicles.
Combines structural plastics, elastomeric seals, and optical lenses into one single component, eliminating fasteners and adhesives.
Achieves superior chemical and mechanical bonding between incompatible resins (e.g., PC/ABS and TPE) through optimized tool temperature control.
Understanding where and how multi-shot tooling is applied to solve complex engineering challenges in modern vehicle programs.
Modern dashboards and door trims integrate capacitive touch controls directly into decorative panels. Multi-colour tooling allows for a hard PC/ABS base substrate, a translucent polycarbonate light guide layer, and a soft-touch TPU outer bezel to be molded simultaneously, creating seamless, dustproof interfaces.
Tail-light lenses and signature DRL (Daytime Running Light) housings require precise transitions between clear, red, and amber PMMA or PC. Multi-shot rotary molds ensure sharp color lines without bleed, maintaining strict optical clarity and environmental sealing standards.
Engine bay components and electrical enclosures require rigid housings with integrated soft gaskets to prevent moisture ingress. Overmolding glass-filled polyamide (PA-GF) with high-temperature silicone or EPDM elastomers guarantees vibration resistance and IP67 sealing.
Precision Engineering Meets Global Manufacturing Excellence
Founded in the heart of China’s manufacturing growth triangle in Yuyao, Zhejiang Province, Ningbo Jinlong Electric Appliance Co., Ltd. is a premier high-tech enterprise specializing in two core industrial pillars: Professional Mold Manufacturing and Advanced Home Appliance R&D.
Spanning a massive 68,000-square-meter modernized facility with $16 million USD in fixed assets, we are strategically positioned near the Ningbo Port and International Airport, ensuring seamless global logistics and supply chain efficiency.
Leveraging dual-sector expertise to deliver high-precision tooling and market-ready consumer products globally.
Our tool-room is the foundation of our quality. With a dedicated 5,000-square-meter precision workshop, we combine Swiss, Japanese, and American technology to deliver export-quality tooling for the world’s most demanding industries.
Advanced Equipment: Equipped with high-precision CNC machining centers, 3-axis Coordinate Measuring Machines (CMM), and specialized EDM machines.
Diverse Industry Reach: Beyond internal needs, we supply complex moulds for Avionics, Medical, Automotive (IATF 16949), and Electronics sectors.
Capacity: 129 injection molding machines (ranging from 15 to 1600 tons) and a tool-room capacity of 1,000 sets of molds per year.
As a global leader in vacuum cleaner and sanitization technology, we operate 18 automated assembly lines with a robust annual capacity of 4 million units. Our R& R team doesn't just follow trends—we set them. We hold global invention patents for unique technologies, such as our integrated vacuum and air purification systems that enhance the user experience through scent-diffusion and filtration.
Product Portfolio: Industrial and domestic vacuum cleaners, floor scrubbers, water purifiers, and "Blue Oxygen" multi-function sterilization products.
Global Partnerships: Trusted OEM/ODM partner for industry giants including Black & Decker, Electrolux, SEB, Shark, Panasonic, and Honeywell.
Domestic Market Leadership: Key supplier for Haier, Joyoung, and Supor.
Designing custom automotive tooling for multi-shot injection requires deep engineering knowledge of polymer chemistry, mold kinematics, and thermal management.
When molding two different materials (such as a rigid polycarbonate substrate and a soft thermoplastic elastomer skin), each polymer shrinks at a different rate during cooling. Our engineering team utilizes advanced Moldflow® simulations to predict thermal deflection and adjust mold cavity dimensions, preventing warping and ensuring flush fits along dividing lines.
Multi-colour tooling relies on complex mechanical actions inside the mold. We design and build heavy-duty rotary platen molds and sliding core-back systems that transition components between injection stages in milliseconds. High-speed, high-precision hydraulic cylinders and servo-driven indexers ensure zero-drift alignment during the second shot injection.
Our commitment to research, quality, and streamlined processing makes us a preferred global tooling partner.
Backed by a 30+ member R&D team and an annual investment exceeding $1.5 million USD, we secure new technological breakthroughs and patents every year.
Our 60+ member Quality Assurance team manages an internal testing facility capable of ROHS environmental measurement. We are fully compliant with ISO 9001, ISO 14001, ISO 45001, and IATF 16949.
Our products meet the strictest international standards, including GS, CE, UL, CCC, ROHS, and WEEE, ensuring smooth market entry for our clients.
From initial mold design and trial to mass injection molding and final assembly, we provide a "one-stop" manufacturing service that reduces lead times and costs.
Decades of manufacturing heritage paired with high-precision equipment and robust engineering capabilities.
Internal production of core products, high efficiency, with 100% facilities and equipment.
ISO: 1998, TS: 2009. Ensuring Quality Control.
Efficient project management and follow-up, strong mold making ability.
Established in 1985, the tool workshop has 30 years of experience in mold making.
More than 10 high-speed CNC machines, 42k rpm CNC; Charmililes electric discharge machine and wire cutting.
More than 30 engineers, using Pro/UG, CAD, CATIA, and mold flow.
How the tooling industry is evolving to meet the demands of tomorrow's smart vehicles.
In-Mold Electronics (IME) is the next leap forward. By printing electronic circuitry on a film insert and overmolding it with structural and protective resins via multi-shot injection, tooling engineers can produce ultra-thin, interactive components with integrated touch sensors and LED lighting.
With environmental mandates tightening, automotive OEMs are demanding tooling that can process bio-based polymers and post-consumer recycled (PCR) resins alongside virgin materials. Tooling designs must adapt to the unique thermal and rheological properties of these green materials.
Conformal cooling channels, designed using AI algorithms and built via metal 3D printing (DMLS) inserts, are becoming standard in complex multi-shot molds. This ensures uniform cooling across different polymer zones, reducing cycle times by up to 30% and eliminating internal stresses.
Explore our diverse capabilities in precision injection tooling across automotive, medical, and appliance industries.
