Impregnation, is the processing step where dry fibres are combined with the liquid resin to make a preform. It is a unique operation, as it combines the fundamentals of fluid flow (matrix) and elasticity (fibres) to produce a truly viscoelastic material. Impregnation is a processing step that strongly affects the process efficiency. Process parameters like speed, temperature, roving yield, and material waste, along with quality aspects like fibre volume fraction and laminate void fraction, are all directly affected by the impregnation process.