Rethinking composite tooling for a circular future
Background
Composite materials are essential in sectors such as automotive, aerospace, and advanced engineering due to their lightweight and high-performance characteristics. Although large efforts are being made to improve the recyclability of composite materials, less focus has been given to the sustainability of the tooling systems used to manufacture these composites.
Traditional composite tooling is often based on thermoset materials, strong and stable, but extremely difficult to recycle. Once their function is over, these molds are frequently landfilled at end-of-life.
TOOL4LIFE (TOOLing materials, design, and process engineering, leading to improved sustainability and wider applications for the composites of tomorrow) is a LIFE Europe-funded project addressing this sustainability gap by developing thermoplastic tooling manufactured through hybrid technology. The process combines additive manufacturing (AM), followed by milling, and in-mold coating, enabling full recyclability after use.
By replacing non-recyclable thermoset tooling with circular thermoplastic alternatives, TOOL4LIFE directly contributes to reducing waste, lowering CO₂ emissions, and improving resource efficiency in composite manufacturing.
Within TOOL4LIFE, Centexbel leads the recycling and material validation activities, ensuring that the developed thermoplastic tooling solutions can withstand multiple life cycles without compromising performance.
Figure: Closed-loop thermomechanical recycling concept developed in TOOL4LIFE. End-of-life thermoplastic composite tooling is shredded, re-compounded into pellets, and reprocessed via additive manufacturing to produce new tooling components, enabling multiple material life cycles.
Built for reuse and recycling
One of the most innovative aspects of TOOL4LIFE is that tooling is not treated as disposable infrastructure, but as a reusable material source. At the end of its life, the thermoplastic tooling, based on carbon fiber–reinforced ABS and PC formulations, can be shredded, regranulated and reintroduced into new manufacturing cycles.
This closed-loop approach allows repeated material use while maintaining technical performance.
Ensuring compatibility between polymer materials and surface treatments is also a key focus. Water-based sealants and coating systems are developed to integrate seamlessly with the thermoplastic substrates while preserving recyclability.
Circularity is therefore embedded into both the material design and the manufacturing process.
Composites of tomorrow
By integrating advanced materials, digital modelling, hybrid manufacturing, sustainable coatings, and recyclability validation into a single system, the project demonstrates how circularity can be embedded directly into industrial infrastructure.
As the composites industry moves toward decarbonization and resource efficiency, TOOL4LIFE offers a practical and scalable pathway to reduce environmental impact without compromising performance.
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