Sonntag Fins makes use of Sicomin’s epoxy resin



Sonntag Fins has collaborated with Sicomin to make use of its GreenPoxy 33 bio-based epoxy resin for making customized carbon windsurf fins. These fins mix pace, fatigue efficiency and sustainability for a few of the quickest sailors. Every Sonntag fin is customized made, tailor-made particularly to the person based mostly on an understanding of driving type, bodily dimension and weight.

The fin is made additionally bearing in mind how the rider likes to load the fin while crusing.

Focused at windsurf slalom sailors, racers and pace sailors, every Sonntag fin is a customized made product, tailor-made particularly to the person based mostly on a dialogue about driving type, bodily dimension and weight, in addition to how the rider likes to load the fin while crusing. This consideration to element and bespoke manufacturing locations an enormous significance on the efficiency and consistency of the uncooked supplies used, with all new supplies having to be validated in manufacturing, on the take a look at rig within the lab, and on the water by the crew riders.

With this in thoughts, Sonntag Fins approached Time Out Composite, Sicomin’s German distributor, searching for a brand new resin system that would scale back cycle occasions and enhance manufacturing output. Bio-based methods have been mentioned, however the first product utilized by Sonntag was Sicomin’s SR1280 laminating system which delivered instant outcomes, enabling shorter treatment cycles, and exceeding all the earlier mechanical take a look at targets.

In 2020, Sonntag and Time Out Composite revisited the subject of a extra sustainable epoxy resin system. It was the proper time for Sonntag Fins, with their new distinctive shiny inexperienced UV resistant outer end, to go inexperienced on the within too with Sicomin’s GreenPoxy 33 resin.

Check fins have been produced with the brand new materials performing nicely in manufacturing trials. Pure resin samples have been additionally examined and post-cured at 140 °levels Celsius, with the brand new GreenPoxy 33 samples exhibiting considerably larger elongation at most resistance, which means the cured epoxy was much less brittle and prone to break ought to a buyer’s fin meet a rock. With mechanical properties improved, Sonntag switched manufacturing to GreenPoxy 33 in August 2020.

Sonntag fins are manufactured in CNC machined aluminium moulds utilizing GreenPoxy 33 and a bespoke lay-up of woven, stitched biaxial and heat-set unidirectional carbon fibre materials in 4 steps.

Step one within the moulding course of is the applying of Sonntag’s distinctive inexperienced in-mould coating. Subsequent, the person cloth plies, reduce utilizing exactly machined templates, are positioned into the mould after which wet-out with the low viscosity epoxy. With the laminate stack full, the mould is closed and loaded right into a heated press for round two hours to consolidate and treatment the fin. After curing, the demoulded fins are tempered in an oven at 140 levels Celsius, then solely a lightweight sanding is required to create the ultimate floor roughness for optimum circulation traits within the water. Lastly, the fins are reduce to the required size and the bottom adapter is molded to the epoxy-carbon blade in a selected mould.

With every fin being optimised for its rider, it’s crucial that every piece produced will bend and twist in precisely the way in which it has been designed to take action, offering the rider with precisely the texture and suggestions they need for his or her board and fin. Every Sonntag fin is examined on a singular CNC managed servo and stepper motor pushed take a look at bench that Joerg has developed, constructing a database of take a look at outcomes that not solely ensures the merchandise carry out as designed but additionally validating the consistency of the manufacturing course of and uncooked supplies.

“We produce high-performance windsurfing fins that must accommodate vital hundreds throughout crusing. Fins want to mix flexibility with extraordinarily excessive torsion stiffness that locations excessive interlaminar shear forces on the resin, particularly in our softer fins,” commented Joerg Sonntag, MD, Sonntag Fins. “A key requirement for us is a resin that maintains its mechanical properties for a few years, and that is the place the Sicomin methods ship”

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Sonntag Fins has collaborated with Sicomin to make use of its GreenPoxy 33 bio-based epoxy resin for making customized carbon windsurf fins.These fins mix pace, fatigue efficiency and sustainability for a few of the quickest sailors. Every Sonntag fin is customized made, tailor-made particularly to the person based mostly on an understanding of driving type, bodily dimension and weigh.





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