01 October 2010
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Adhesives tapes used in wind turbine blade manufactures

The resin infusion mould (RIM) process is enabling the manufacture of high quality composite parts in a wide range of fibre and resin combinations.

Central to the structural integrity and performance of finished parts made this way is saturation of the glass fibres with the resin to eliminate voids and provide a pinhole-free surface finish. RIM

RIM relies on vacuum-assisted resin transfer provided through spirals located in the moulds. These are temporarily fixed and removed after processing with tesa 51960 fabric reinforced double sided PP film with a different adhesive coat weight either side of the carrier. The side with the highest adhesive coat weight bonds to the spiral preventing lift-off during moulding while enabling residue-free removal after processing.

Essential anti-stick surfaces inside RIM moulds are created with tesa 4810, a single sided PTFE laminated glass cloth tape with a silicon adhesive. The use of this tape eliminates the time-consuming process of using liquid mould releasing agents and avoids the potentially damaging transfer of liquid release agent to the surface of the turbine blades and other finished components.

Also assisting the RIM process during infusion are 'flash tapes' which are used for temporary masking inside or around the mould. The excellent performance of both tesa 61122 and 61123 on the low energy surface of moulds makes them ideal for this task. The different thicknesses of these tapes are used to meet varying tensile strength requirements.

Visitors to the forthcoming FAST Exhibition, being held on the 21st October 2010 at the National Motorcycle Museum Birmingham will be able to discuss specific applications with tesa Tapes on the stand

Author
Paul Gay

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