From the Sector

Sicomin’s latest marine collaboration with Sonntag Fins sees its industry leading GreenPoxy® 33 bio-based epoxy resin used for custom carbon fibre windsurf fins - combining speed, fatigue performance and sustainability for some of the fastest sailors afloat.

Targeted at windsurf slalom sailors, racers and speed sailors, each Sonntag fin is a custom made product, tailored specifically to the user based on a discussion about riding style, physical size and weight, as well as how the rider likes to load the fin whilst sailing.  This attention to detail and bespoke manufacturing places a huge importance on the performance and consistency of the raw materials used, with all new materials having to be validated in production, on the test rig in the lab, and on the water by the team riders.

With this in mind, Sonntag Fins approached Time Out Composite, Sicomin’s German distributor,  looking for a new resin system that could reduce cycle times and improve manufacturing output.  Bio-based systems were discussed, but the first product used by Sonntag was Sicomin’s SR1280 laminating system which delivered immediate results, enabling shorter cure cycles, and exceeding all of the previous mechanical test targets.

In 2020, Sonntag and Time Out Composite revisited the topic of a more sustainable epoxy resin system. It was the perfect time for Sonntag Fins, with their new unique bright green UV resistant outer finish, to go green on the inside too with Sicomin’s GreenPoxy® 33 resin.

Test fins were produced with the new material performing well in production trials. Pure resin samples were also tested and post-cured at 140 ̊C, with the new GreenPoxy® 33 samples showing significantly higher elongation at maximum resistance, meaning the cured epoxy was less brittle and susceptible to damage should a customer’s fin meet a rock. With mechanical properties improved, Sonntag switched production to GreenPoxy® 33 in August 2020.

Sonntag fins are manufactured in CNC machined aluminium moulds using GreenPoxy® 33 and a bespoke lay-up of woven, stitched biaxial and heat-set unidirectional carbon fibre fabrics in four steps:
• The first step in the moulding process is the application of Sonntag’s unique green in-mould coating.
• Next, the individual fabric plies, cut using precisely machined templates, are placed into the mould and then wet-out with the low viscosity epoxy. With the laminate stack complete, the mould is closed and loaded into a heated press for around 2 hours to consolidate and cure the fin.
• After curing, the demoulded fins are tempered in an oven at 140 ̊C, then only a light sanding is required to create the final surface roughness for optimum flow characteristics in the water.
• Finally, the fins are cut to the required length and the base adapter is molded to the epoxy-carbon blade in a specific mould.
With each fin being optimized for its rider, it is critical that each piece produced will bend and twist in exactly the way it has been designed to do so, providing the rider with exactly the feel and feedback they want for their board and fin. Each Sonntag fin is tested on a unique CNC controlled servo and stepper motor driven test bench that Joerg has developed, building a database of test results that not only ensures the products perform as designed but also validating the consistency of the manufacturing process and raw materials.
“We produce high-performance windsurfing fins that need to accommodate significant loads during sailing. Fins need to combine flexibility with extremely high torsion stiffness that places high interlaminar shear forces on the resin, especially in our softer fins.” commented Joerg Sonntag, MD, Sonntag Fins. “A key requirement for us is a resin that maintains its mechanical properties for many years, and this is where the Sicomin systems deliver”

In line with the powerful global trend towards smarter fashion solutions, Iluna Group launches its Embroidery Division. Specialists in lace since 1985, the new Embroidery Division offers a complete and innovative product match in line with the modern expectations of brands and retailers. Staying true to Iluna’s DNA, the introduction of embroidery and guipure are all produced with only recycled materials.
IIn addition to the launch of the Embroidery Division, this season novelties include:

1. Of major interest today, the launch of velvet lace entirely made of sustainable materials including ROICA™ Eco-Smart family.

2. Within the Black Label collection, the Ultralight series is enriched with new multicolor floral galloons: here Iluna changes the color of the thread not only in the background, but also in the design, the same article reinvents itself in a variety of great visual impact.

3. Green Label collection, the Iluna dedicated range featuring a new responsible approach in respect of the planet and people, able to deliver innovation, beauty and quality, at 360°. In addition to the all over, jacquard, double jacquard and mesh offer, the line is also featuring new stretch Galloon laces fully made with GRS certified recycled materials, including the stretch thanks to the introduction of the unique ROICA™ sustainable yarn part of the ROICA™ Eco-Smart family.

4. ILUNA has strategically included in all their stretch laces only ROICA™ Eco-Smart family of sustainable yarns since some time.

5. ILUNA can also boast its new STeP (Sustainable Textile Production) certification by Oeko-Tex, a certification that clarifies and communicates the company’s sustainable production commitment. In addition to this, all products are Oeko-Tex 100 certified.

6. ILUNA has created the new e-shop offering its exclusive materials to smaller companies looking for added values as: creativity, innovation, made in Italy and responsibility.

7. The whole collection is also visible online at its web site, previous registration, and orders can be done directly online always aiming to customers care.