From the Sector

Fibres, fabrics, epoxy resins and adhesives from Sicomin have been used by Grand Largue Composites (GLC) to construct the first Class40 racing yacht to feature a significant quantity of flax-fibre reinforcements.
The yacht, called Crosscall, won the Class40 World Championships in June 2022 and is a prototype of the new Lift V2 design by Marc Lombard, one of the leading naval architects in this field.

Class40 is one of the most competitive fleets in yacht racing. The hulls of Class40 yachts must be light in weight, strong and stiff, and durable in the most extreme of conditions. Furthermore, to keep costs down, they cannot be reinforced with carbon fibres. The quality and reliability of the resins used for the infusion and lamination of the hulls are therefore of paramount importance.

Crosscall's cockpit was designed to be effectively non-structural, with the mainsheet, which can generate huge shock loads, supported separately. This would allow the cockpit to be made from a hybrid biaxial fabric comprising 50% flax fibres. Other parts of the boat that incorporate flax fibre include the tunnel, the engine cover, the ballast tanks and the cap. The rest of the boat is reinforced with 100% glass-fibre fabrics.

To help it realise this ambitious design, GLC, an infusion specialist, turned to its long-time material supplier, Sicomin. The hull was moulded and infused in one piece and the deck – including the hybrid flax-fibre cockpit – was also infused as a single part. The internal structure was then laminated into the hull by hand before the hull and deck were finally bonded together.

The infusion resin selected was Sicomin’s SR 1710, a high-modulus structural epoxy. Designed specifically for use in infusion and injection processes, it has exceptionally low viscosity and its low-reactivity hardener makes it suitable for the production of large parts. Composites components made from SR 1710 possess high interlaminar shear-strength and the resin retains its mechanical properties in wet environments.

Sicomin’s low-toxicity SR 8200 was used to laminate the internal structures onto the skin of the hull. Ideal for hand laminating, this system includes a choice of hardeners with a wide range of reactivities, which makes it equally suitable for making large or small parts. The hull and deck were joined together with Sicomin’s Isobond SR 7100, which demonstrates high fatigue strength and is very resistant to microcracking.

An epoxy bonding primer – called Undercoat EP 215 HB+ and supplied by Sicomin’s sister company, Map Yachting – was applied to the moulds first to make demoulding easier. It also serves as an undercoat in the polyurethane exterior paint system that is used instead of gelcoat to protect the epoxy hull from UV damage.

Since the launch of Crosscall, GLC has started building a second Lift V2 Class40 and a third one is now planned, both for which Sicomin will supply the materials.

The ITA Group, consisting of the Institute for Textile Technology of RWTH Aachen University (ITA), their research and development service provider ITA Technologietransfer GmbH (ITA GmbH) are proud to announce their new strategic positioning: in order to better respond to actual industrial demands and needs, ITA decided to install a partnership model as of January, 25 2022.

The ITA Group comprises the ITA of RWTH Aachen University, a leading research and qualification research institute with 400 employees in the areas of fibre-based high-performance materials, textile semi-finished products and their manufacturing processes and the ITA Technologietransfer GmbH, the partner of the industry in R&D, providing technology and knowledge transfer, as well as offering comprehensive solutions along the entire textile value chain.

Prof. Dr. Thomas Gries, Director of ITA, explains the new partnership model:” The impact of the Covid-19-crisis has shown once more the importance of long-term trustworthy business relationships. Therefore, we are establishing our new partnership model where we will even more closely cooperate with our actual and future industrial partners, providing them with the latest technologies and innovations from R&D side. We will initiate networking and workgroup meetings, offer access to ITA´s large machine parks and labs, carry out joint partner projects and commonly organized publicly-funded projects as well as training for partner´s employees and HR opportunities.”

Dr. Christoph Greb, Scientific Director of ITA: “We are very happy to initiate this new partnership model where science, research and industry are working shoulder to shoulder in pre-competitive projects on our future projects along the entire value-chain from the fibre to the final component in order to close a missing gap and form innovative paths forward in various industrial fields.”

During an initial session of three Innovation days in hybrid format, ITA successfully introduced in September 2021 the first industrial partner projects which will be carried out, among them “Recycling of composite battery cases”, “Recycling of composite pressure vessels”, “Natural Fibre Composites”, “Textile Structures with focus on biaxial Warp-Knitted Structures”, “Factory of the Future”, “Tapes and Hybrid Yarns”.

The next opportunity to meet with ITA is at JEC DACH in Frankfurt (November 23 and 24 2021).