Bi-injection: An innovative and high-performance technology
Plastic bi-injection is an advanced manufacturing process that allows two different materials to be injected successively into the same mold using a single press. This technique relies on the use of two injection units, ensuring optimal fusion of the materials while preserving their respective properties. Thanks to this approach, it is possible to design plastic parts that combine aesthetics, strength, and functionality, thus meeting the most stringent requirements of cutting-edge industries.
The benefits of plastic bi-injection
Increased strength and durability
One of the main advantages of bi-injection is that it improves the mechanical performance of the parts produced. By combining two materials with complementary properties, this process offers increased resistance to impact, thermal stress, and chemical agents. This technology is particularly suited to sectors requiring highly robust components, such as aerospace, automotive, and electronics.
Optimized design for premium aesthetics
Bi-injection allows multiple colors or textures to be integrated into a single part without the need for additional painting or assembly steps. This process facilitates the creation of innovative designs and premium finishes, which are highly sought after in the luxury, consumer electronics, and consumer goods industries.
Advanced features and versatility
The combination of materials with different properties allows rigid and flexible areas to be integrated into the same part. This paves the way for innovative solutions, such as the addition of anti-slip coatings, reinforced sealing, or integrated shock absorbers. Dual-injection molded parts are therefore ideal for designing ergonomic components for automobiles, medical equipment, and portable devices.
Types of parts manufactured in bi-injection
Double-injection molded parts are widely used in applications requiring specific characteristics, combining robustness, flexibility, and aesthetics. Common applications include:
- Automotive: Dashboard components with touch-sensitive areas, reinforced fasteners.
- Electronics: Remote control housings, smartphone cases with integrated soft-touch grip areas, moisture-proof connectors.
- Medical: Surgical instrument handles, ergonomic syringes with elastomer grip areas, safety caps.
- Aerospace: Ergonomic handles and controls, backlit cockpit panels, armrests and headrests combining rigidity and comfort.
- Luxury: Dual-material watch straps, premium cosmetic packaging with high-end finishes, elegant and durable eyeglass frames.
Optimized production for reduced costs and waste
Thanks to bi-injection, complex parts can be produced in a single operation, reducing assembly and finishing costs. This process also contributes to better material management by limiting waste and scrap. By eliminating certain manufacturing steps, companies achieve significant savings in labor, energy, and resources, while optimizing production times.
DEMGY Făgăraș is part of this dynamic, integrating this technology in April 2025.
Thanks to this cutting-edge tool, our Romanian plant will be able to improve its efficiency, reduce manufacturing costs, and speed up production cycles. The adoption of bi-injection will also enable us to design more complex parts that meet the specific needs of our customers and the requirements of international markets.
Various sectors are benefiting from bi-injection
Many industries are exploiting the advantages of bi-injection to improve the quality and performance of their products. These include:
- Automotive: Reduced vehicle weight, improved comfort and ergonomics in passenger compartments.
- Electronics: Better protection against impact and moisture, optimized device design.
- Medical: Improved hygiene, more precise instruments and enhanced user comfort.
- Aerospace: Manufacture of lightweight yet robust parts, such as interior panels and cockpit components, which require both mechanical strength and comfort.
- Luxury: Creation of high-end aesthetic products, such as accessories or watch parts, combining refined design and innovative materials for perfect finishes.
- Sports and leisure: Manufacture of high-performance components, such as ergonomic sports equipment or bicycle and surfboard parts, which combine lightness, flexibility, and strength.
Why choose bi-injection for your industrial projects?
Opting for plastic bi-injection means choosing a cutting-edge technology that combines performance, design, and competitiveness. This innovative process enables companies to meet growing market demands by offering high-quality, durable, and functional parts, while optimizing costs and reducing environmental impact.
At DEMGY, we support our customers in their custom manufacturing projects by providing them with our expertise and state-of-the-art equipment. Our teams of engineers and technicians are at your disposal to design and produce solutions tailored to your specific needs.
Would you like to find out more about the possibilities offered by plastic bi-injection? Contact us today to discuss your project and discover how we can help you achieve your industrial goals with innovative and high-performance solutions.