“The Curing Time Is Much Shorter than in the Autoclave Process”

Why It Matters

By slashing energy consumption and emissions, these fast‑curing methods make bio‑based composites economically and environmentally competitive, accelerating their adoption in aerospace, wind‑energy and marine applications.

Key Takeaways

• UV‑cured RTM cuts cycle time versus autoclave
• CO₂ emissions drop up to 70% with UV process
• Mechanical properties match or exceed traditional curing
• Microwave infusion accelerates curing, independent of humidity
• Equipment size remains primary scale‑up hurdle

Pulse Analysis

The composite industry has long relied on autoclave cycles that consume large amounts of heat and time. Cidaut’s recent breakthrough replaces that paradigm with a resin transfer moulding (RTM) line that initiates frontal photopolymerisation using a narrow UV window. By irradiating only the resin front, the reaction propagates through the part, eliminating the need for ovens and cutting cure times dramatically. The system accepts any photopolymerisable bio‑epoxy, balances viscosity with photo‑initiators, and delivers Young’s modulus and glass transition temperatures equal to or better than conventional routes, while slashing energy demand.

Complementing the UV route, the consortium has demonstrated vacuum infusion assisted by microwave heating. Microwaves are absorbed directly by the bio‑resin and reinforcing fibres, generating internal heat that accelerates cross‑linking regardless of ambient humidity or temperature. Process parameters such as power level, exposure time and fibre volume are tuned to achieve uniform temperature fields, a known hurdle for dielectric heating. Test coupons cured under microwave assistance reached the same DMA‑derived modulus and Tg as those cured in convection ovens, yet with cycle reductions that translate into lower operating costs.

From a sustainability perspective, life‑cycle modelling in Sphera’s GaBi shows up to a 70 % reduction in CO₂ emissions for the UV‑RTM line, positioning the technology as a viable low‑carbon alternative for aerospace, wind‑energy and marine sectors. Although the microwave equipment’s footprint and capital outlay remain scaling challenges, the faster throughput and smaller shop‑floor area promise long‑term economic upside. As the r‑LightBioCom consortium prepares to showcase these processes at JEC World, industry players are likely to evaluate integration pathways, anticipating that fast‑curing, bio‑based composites could become the new baseline for high‑performance, environmentally‑responsible manufacturing.