From waste to composite - A holistic recycling strategy
The empirical knowledge about textile recycling strategies, which was founded in the institute the last ten years, is still state of the art. A broad market acceptance is impeded by the great variation of material properties. The return of fiber waste to new lightweight materials, especially for thermoplastic matrices, is a scientific and industrial challenge, which will be handled in several research projects.
The shaping of fiber matrix interface and the continuous production of lightweight materials would be of special importance. The research project "rCF-Organo sheet" forms the basis for further projects. Lightweight materials have been created from hybrid nonwovens, made of recycled carbon and virgin thermoplastic fibers. The characteristic profiles were higher than similar and available laminates from glass. According to the heterogeneity of age and type of sizing agents in the waste fraction, it is necessary to de- and resizes the fibers. A gentle and economic desizing process forms the basis for further treatment of recycling materials. In the scope of the ZIM-project "KontEnt - Continous resizing process" different kinds of textiles should be treated in a gentle manner. Internal release agents were not used for manufacturing organo sheets, because a decrease of material properties was detected. Especially for the continuous compression Moulding exist no resource- and environmentally friendly processes. The BMWI financed project "TrennTech - Technologies for continuous demolding processes" has the topic to compare processes (new approaches and known processes) for continuous compression moulding of thermoplastic composites.
All ongoing projects shall aim at increasing and stabilization of composites properties made of recycling fibers. The market acceptance for these materials shall be improved. New industrial applications have to be named.