pps proceeding - Abstract Preview
pps proceeding
Symposium: S09 - Reactive Processing
Poster Presentation
 
 

Production of CFRP components with clear surface layer in the PU spray impregnation process

Hopmann Christian (1), Karatzias Christos (1), Boettcher Arne (1)*, Fischer Kai (1)

(1) IKV - Institute of Plastics Processing at RWTH Aachen University - Aachen - Germany

The high volume capable production of continuous carbon fibre reinforced plastic (CFRP) components for visible areas with high fibre volume contents still presents a challenge. One of the most important disadvantages is low economic efficiency due to the required subsequent work (grinding, painting). To overcome this disadvantage, a process for a high volume capable production of such visible components with polyurethane (PU) matrix systems is being developed at the Institute of Plastics Processing (IKV) at RWTH Aachen University. Two approaches based on the manufacturing processes PU spray impregnation and wet pressing are pursued. Both approaches rely on the generation of a clear PU surface layer (coating) on the visible component surface. As process variants, a one-step pressing process with an application of the coating directly on the non-cured PU-impregnated preform has been developed, as well as a process with an application of the coating on the pre-cured or on the final-cured CFRP component. This paper describes the results of the process analysis for the process integrated application of the coating material. The investigations include a variation of the process, material and preforming parameters. The focus of the investigations was the generation of a low surface waviness and a good adhesion between the coating and the CFRP component. The results of investigations regarding the surface quality for the combination of an aromatic PU system as matrix system and an aliphatic lightfast PU system as coating material show, that the coating material can compensate the characteristic waviness of the neat CFRP component. In this paper, the influence of the process parameters on the surface quality is analysed and optimum process parameters for the developed one-step pressing process are concluded.