Method for manufacturing a wind turbine blade and a prepreg sheet therefor

DK4049835T3Active Publication Date: 2026-07-06LM WIND POWER AS
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Patent Information

Authority / Receiving Office
DK · DK
Patent Type
Patents
Current Assignee / Owner
LM WIND POWER AS
Filing Date
2021-02-25
Publication Date
2026-07-06

AI Technical Summary

Technical Problem

The challenge in manufacturing wind turbine blades lies in achieving strong adhesion between pre-manufactured spar caps and blade shell members, particularly when using different types of resins, such as polyester and vinyl ester or epoxy ester, and the difficulty in applying primers to the spar caps without damaging them during handling.

Method used

The use of pre-impregnated fibre sheets with a first layer pre-impregnated with an adhesion promoter facing the spar cap and a second layer facing the blade shell members, facilitating adherence during resin infusion and eliminating the need for primer application on the spar cap surfaces, thereby enhancing structural integrity and reducing manufacturing time.

Benefits of technology

This method ensures strong and consistent adhesion between the spar cap and the blade shell members, increases fracture toughness, and reduces the risk of damage during handling, while allowing the use of cost-effective polyester resin for the blade shell members.

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Abstract

The present invention relates to a pre-impregnated fibre sheet (20a,20b) extending in a longitudinal direction and in a transverse direction and comprising a first fibre layer (21) forming part of an upper surface of the pre-impregnated fibre sheet and a second fibre layer (22) forming part of a lower surface of the pre-impregnated fibre sheet, wherein the first fibre layer is pre-impregnated with an adhesion promotor. The present invention further relates to methods of manufacturing a blade shell member or wind turbine blade comprising a pre-manufactured spar cap (100) and a number of pre-impregnated fibre sheets (20a,20b) arranged to obtain an improved adherence between the blade shell (80) and pre-manufactured spar cap, particularly when the pre-manufactured spar cap is resin infused with vinyl ester or epoxy resin and the blade mould is resin infused with polyester.
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