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A lay-up process is a moulding process for composite materials, in which the final product is obtained by overlapping a specific number of different layers, usually made of continuous polymeric or ceramic fibres and a thermoset polymeric liquid matrix. It can be divided into dry lay-up and wet lay-up, depending on whether the layers are pre-impregnated or not.
Dry lay-up is a common process in the aerospace industry, as it is possible to obtain complex shapes with good mechanical properties, characteristics required in this field. This is because a wet lay-up cannot be performed with uni-directional fabrics, which have better mechanical properties, so it is mainly used in other areas which have lower performance requirements.
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