Ahlstrom-Munksjö glass and carbon fibre composite team have developed a carbon-fibre-based unidirectional fabric.

In a unidirectional (UD) fabric the majority of fibres run in one direction only. The newly developed fabric can be laminated to 165 layers or even more in one shot. The previous record of infusing carbon fibre unidirectional fabric was 120 layers.

Ahlstrom-Munksjö Building & Wind vice president Pekka Helynranta said: “We are really excited about the new HighFlow Carbon unidirectional fabric. Our team in Mikkeli plant, Finland, did excellent work with this.

“HighFlow Carbon Wind Energy is specially designed for wind turbine blades to enable larger new-generation wind turbines.”

Bigger wind turbines can generate more energy and when they are increased in size, blade size is also increased. To optimise power generation, blades should be lightweight and stiff. Until now, there wasn’t a good solution to this. HighFlow Carbon solves this problem. By increasing the number of unidirectional fabric layers up to 165, we are able to help the customer to reach a new level of thickness on spar cap laminates. The fabric was unidirectional carbon fibre 600g/m2.

By using Ahlstrom-Munksjö HighFlow fabrics, the infusion process itself is more reliable as there is a lower risk for unsaturated areas of carbon unidirectional fabric.  In this new range of products, the permeability of fabrics is totally engineerable, the flow rate and direction can be controlled. This means that our customers can now forget problems related to the infusion of carbon fibre fabrics.

We have reached a high level of interest from our customers. Our customers are turbine blade manufacturers which use the blades on their own turbines or sell the blades to the big global wind turbine manufacturers. Also, design offices, which make blade designs for blade manufacturers have shown interest in our new concept.