COMPOSITES EUROPE 2012 Blog

COMPOSITES EUROPE Blog interviewed Stephan Knappe – International Sales and Applications Manager at NETZSCH-Gerätebau GmbH. The company is a new exhibitor at COMPOSITES EUROPE show in September!

Q: Question

SK:  Stephan Knappe

Q: Please introduce yourself – who are you, what are your responsibilities at NETZSCH-Gerätebau GmbH?

SK: Chemical engineer, International Sales and Applications Manager, dedicated to polymer and composite applications. Currently also responsible for sales in Southern Europe.

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Every movement must be just right when the blade and rotor hub of a wind turbine are married together at a dizzy height.  Because screwing the rotor blade onto the rotor hub 100 metres above the ground represents a major bonding technology challenge. Heavy-duty threaded bushes are bonded into the fibre-reinforced flange on the blade holder of each blade – and the bond must be absolutely rock solid.

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2009 was also a difficult year for the processors of fibre composites.  According to the information given by the Federation of Reinforced Plastics (AVK), the demand for and the production of duroplastic SMC and BMC components was determined by market developments in the main automobile and electronic applications. 

The “Envirez” material from Ashland Performance Materials is used in boatbuilding (Photo: Ashland).

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To ensure their suitability when used in wind energy systems, the epoxy resin adhesives used must be suitably certified by Germanischer Lloyd (GL). This is because rotor blades must withstand extreme stresses. The larger the unit, the higher the demands on the fatigue strength of the rotor blades manufactured from composites. In the near future, experts predict 10 megawatt systems with 80 metre long wind vanes.

The enormous rotor blades consist of two half shells, that are produced in suitable moulds from cross-linked hard foams and inserted balsa woods, which are subsequently stuck together. The balsa wood is cultivated in plantations in Ecuador and is harvested after six years. From a one metre long tree trunk, rectangular timber sections are cut and stuck together to make 1.22 metre long and five centimetre wide ashlars. These blocks are then cut into boards against the grain and finely sprayed with a resin solution to protect them against moisture.

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