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The global healthcare sector is experiencing an unprecedented surge in demand for highly complex, ergonomic, and extremely reliable medical electronics. As devices transition from clinical environments to point-of-care and home-use settings, the aesthetics, safety, and functionality of medical device housings and precision enclosures have become paramount. Standard single-material injection molding is no longer sufficient to meet these modern requirements.
Multi-colour injection moulding (commonly referred to as multi-shot, 2K/3K, or co-injection molding) has emerged as the premier manufacturing technology to address these challenges. By injecting two or more different thermoplastic materials or colors into a single mold during a single processing cycle, manufacturers can produce complex parts that combine rigid structural skeletons with soft-touch grips, integrated seals, transparent display windows, and built-in color coding. This eliminates the need for secondary assembly processes, reduces part counts, and minimizes contamination risks—a critical factor in sterile medical environments.
1. Ergonomics & Patient Safety: Soft-touch elastomeric grips overmolded onto rigid structural components prevent slippage during surgical procedures and improve user comfort.
2. Hermetic Sealing & IP Protection: Integrated thermoplastic elastomer (TPE) or liquid silicone rubber (LSR) seals protect internal electronics from moisture, dust, and aggressive sterilization fluids.
3. Brand Differentiation & Usability: Multi-colour interfaces allow clear visual differentiation of functional buttons and controls, reducing operator errors in high-stress clinical environments.
Multi-shot injection molding excels in applications where performance, sterilization resistance, and precision tolerances must coexist. Here is how the technology is deployed across key medical sectors:
Handheld diagnostic devices, blood glucose meters, and patient monitors require robust, impact-resistant enclosures. By utilizing 2K molding, a rigid polycarbonate (PC) or ABS core is overmolded with a shock-absorbing TPU layer. This protects internal electronics from drops while providing an anti-slip grip and chemical resistance to aggressive hospital-grade disinfectants.
Surgical tools require absolute precision and sterilization compatibility (autoclaving, Gamma radiation, or EtO). Multi-colour molding allows for the integration of color-coded rings directly into the tool handle, allowing surgeons to quickly identify tool sizes. Overmolding high-performance engineering plastics like PEEK or PPSU with medical-grade silicone ensures thermal stability and durability.
Inhalers, insulin pens, and microfluidic cartridges rely on precise seals to prevent fluid leakage. Multi-material molding facilitates the co-injection of rigid structural channels with soft, elastomeric sealing lips in a single cycle. This eliminates manual gasket placement, reduces the risk of particulate contamination, and guarantees a perfect hermetic seal.
Successfully executing multi-colour injection moulding requires a deep understanding of polymer chemistry and ultra-precise mold engineering. The primary challenge is achieving a strong cohesive bond between the different materials. If the materials are chemically incompatible, they will not fuse, leading to delamination under mechanical stress or exposure to sterilization agents.
Our engineering team utilizes advanced molecular bonding techniques, pairing materials with compatible melt temperatures and polar structures—such as bonding TPE/TPU to ABS, Polycarbonate (PC), or Acrylic (PMMA). When chemical bonding is insufficient, we engineer mechanical interlocks (recesses, holes, and undercut grooves) into the tool design to mechanically lock the materials together.
From a tooling perspective, multi-shot molds are highly complex. They require integrated mechanisms such as index plates, rotary platens, or core-back systems to move the molded substrate from the first injection station to the second. Achieving tolerances within ±0.005mm is critical to prevent flash (molten plastic escaping into areas where it shouldn't be) and ensure the seamless integration of colors and textures.
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.
Integrating high-end mold design with cutting-edge production capabilities to deliver turnkey manufacturing solutions for global industries.
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.
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&D 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.
We combine state-of-the-art engineering, strict compliance, and cost-effective production to support your product development cycle.
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.
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.
As medical technologies advance, several key trends are shaping the future of precision enclosure design and production:
Micro-injection Molding: The miniaturization of implantable devices and wearable health trackers is driving the need for micro-scale multi-shot components. Molding features measured in microns requires advanced tooling technologies and extreme stability during the injection cycle.
Bio-compatible & Sustainable Polymers: There is a growing demand for bio-compatible materials that comply with USP Class VI and ISO 10993 requirements. Additionally, the industry is exploring bio-based engineering resins to reduce the environmental footprint of medical devices without sacrificing performance or safety.
Smart Enclosures with Integrated Electronics: The integration of conductive plastics and printed electronics directly into molded enclosures (In-Mold Electronics or IME) is paving the way for next-generation smart devices. This eliminates traditional PCBs, reducing device thickness and weight.
