In previous research, the potential of glass fibre reinforced anionic polyamide-6 (APA-6) composites for use in wind turbine blades was proven. Based on polymer properties, viscosity, processing time, costs and recyclability, APA-6 composites are considered the most suitable reactive thermoplastic material candidate. However, more research is needed to mature the knowledge of the APA-6 material and its processing which can be achieved by understanding the effect of the individual steps in the manufacturing process and by studying the material behaviour in more detail. First of all, an experimental study on the effect of the individual steps in the manufacturing and post-processing process was performed to increase the homogeneity of the composites and identify the most important processing parameters. Secondly, semi-empirical models for the prediction of the reaction kinetics and rheology were built to better estimate the infusion time, start of reaction and the behaviour of the material. These models were then used to predict the heat build-up due the exothermic reaction in thick-walled composites. Based on the models for the reaction kinetics and rheology and the knowledge build from the experimental investigation, it is thought that an optimisation of the whole manufacturing process for a specific product is feasible and that the material behaviour within that process can be well predicted.