Mechanical separation of kenaf for composite applications – Evaluation of the total fibre line concept for field retted kenaf

Abstract

This publication introduces a promising concept for the effective decortication and separation of kenaf stems, which is adapted to different degrees of retting. Kenaf (Hibiscus cannabinus L.), a natural fibre with immense potential for sustainable materials, presents challenges in decortication due to its diverse properties. In response, we offer a technical solution that achieves exceptional cleaning efficiency, resulting in fibre-free shives and nearly shive-free fibre bundles. Our investigations reveal that the degree of decortication of kenaf stems can be finely adjusted using different cleaning concepts. The process attains optimal fibre bundle lengths through cleaning steps, rendering them ideal for fleeces and needle felts in the automotive industry. Furthermore, our separation pre-tests demonstrate the suitability of the total fibre line concept for kenaf processing. Particularly, well-retted kenaf showcases superior processability compared to non-retted kenaf. The significance of this study lies in developing an efficient and sustainable solution for harnessing kenaf’s potential as an automotive material. By optimising the decortication process, we can obtain high-quality fibres that meet the demands of automotive applications, contributing to creating eco-friendly and lightweight materials. As sustainability gains prominence in industries worldwide, the total fibre line concept presents a crucial step forward in realising greener and more environmentally conscious automotive practices. The abundance and renewability of kenaf, combined with the cost-effectiveness of our proposed decortication approach, make it a viable alternative to traditional materials derived from fossil fuels. This research establishes the feasibility and benefits of adopting our total fibre line concept for processing kenaf stems. The versatility of this technology offers opportunities for further exploration and extension to other natural fibres to promote a more sustainable future for the automotive industry and beyond.