In-Mold Electronics (IME) is an emerging manufacturing technology that integrates electrical circuits and electronic functions directly into injection-molded or compression-molded plastic components. The technology combines printed electronics, conductive materials, electronic components, and conventional plastic molding to create three-dimensional parts with built-in electrical functionality. This approach can reduce the number of separate components and assembly steps while enabling new possibilities for automotive design.

For exterior automotive applications, IME can be used to integrate functions such as lighting, antennas, sensors, heating elements, touch interfaces, camera modules, and illuminated logos directly into plastic parts. Potential applications include tailgates, exterior panels, grilles, mirror housings, lighting components, license-plate areas, and other molded vehicle structures.

Technology and Manufacturing Approach

The typical IME process begins with the printing or formation of conductive circuits on a suitable plastic or flexible substrate. Electronic components can then be mounted or integrated onto the circuit. The substrate is subsequently formed into the required three-dimensional shape and integrated with the plastic component through injection molding, compression molding, or overmolding. Protective layers or encapsulation may be added to improve durability and environmental resistance.

The choice of materials is an important consideration. Potential substrate and molding materials include ABS, polycarbonate (PC), polyamide (PA), polypropylene (PP), PET, and polyester. Conductive functionality can be achieved using silver- or copper-based conductive inks, conductive polymers, metal films, and other conductive materials. Material compatibility, adhesion, thermal resistance, chemical resistance, and durability under automotive environmental conditions need to be evaluated before implementation.

Benefits for Automotive Applications

IME offers several potential advantages over conventional approaches in which electronic components are manufactured separately and assembled onto plastic parts. It can reduce component count, wiring, connectors, and secondary assembly operations, potentially lowering manufacturing cost and weight.

The technology also enables greater design flexibility by allowing electronics to follow the shape and contours of molded plastic components. This can support seamless styling and integrated lighting or sensing functions that are difficult to achieve using conventional assemblies.

Key potential benefits include:

• Ready-to-use solutions with integrated electronic functionality.
• Lower manufacturing and assembly costs through reduced component and assembly requirements.
• Scalability for high-volume automotive production.
• Weight and space reduction through integration of electronics into existing plastic structures.
• Improved product quality and reliability by reducing connectors, wiring, and separate interfaces.
• Design flexibility, enabling electronics to be incorporated into curved or three-dimensional surfaces.
• Regulatory compliance, including consideration of RoHS, REACH, and relevant automotive requirements.
• Simplified manufacturing and assembly, with the potential for reduced dependency on multiple suppliers or post-molding operations.

Relevance to Electric Vehicles

The increasing electrification and digitalization of vehicles are creating greater demand for compact and integrated electronic systems. Electric vehicles contain a growing number of sensors, antennas, lighting functions, control interfaces, and connectivity systems. At the same time, manufacturers are seeking opportunities to reduce vehicle weight, simplify assembly, and improve aerodynamic and exterior design.

IME can support these objectives by integrating electronic functionality directly into molded vehicle components. The technology is therefore particularly relevant to future electric, connected, and increasingly automated vehicles.

Study Scope and Evaluation

The proposed study will identify and evaluate technologies and technology providers capable of integrating electrical conductors and electronic functionality into injection-molded and compression-molded plastic parts for exterior automotive applications.

The technologies will be assessed against parameters including:

• Technology capability and manufacturing method
• Proof of concept and demonstrated applications
• Technology readiness level (TRL)
• Availability and freedom-to-use considerations
• Cost and scalability
• Material and process compatibility
• Safety and regulatory compliance
• Implementation time and ease of adoption
• Industrial maturity and market position
• Geographical availability
• Suitability for automotive exterior applications

The study will also examine available proof-of-concept solutions to determine which technologies can realistically be transferred into an industrial automotive manufacturing environment.

Preliminary Technology Assessment

Based on the initial assessment, In-Mold Structural Electronics® (IMSE) from TactoTek and Duratech Industries appears to be a promising technology for integrating electronic functionality into molded plastic structures. The technology provides a platform for embedding conductive circuits and electronic components within three-dimensional molded parts.

The ITRI injection-molding technology disclosed under US20240112969A1 is another relevant technology identified for further evaluation, particularly regarding its approach to integrating electrical conductors within injection-molded plastic components.

Way Forward

IME represents a promising approach for the next generation of automotive exterior components by combining electronics, plastics, and structural functionality within a single molded part. Its potential to reduce assembly complexity, weight, wiring, and component count while enabling innovative styling makes it particularly relevant to electric and connected vehicles.

The key objective of the study is therefore to identify the most technically feasible, commercially viable, scalable, and readily implementable technology for integrating electrical circuits into injection-molded or compression-molded plastic components for automotive exterior applications.