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Ioncell-F, a recently developed process for the production of man-made cellulosic fibers from ionic liquid solutions by dry-jet wet spinning, is presented as an alternative to the viscose and N-methylmorpholine N-oxide (NMMO)-based Lyocell processes. The ionic liquid 1,5-diazabicyclo[4.3.0]non-5-ene acetate was identified as excellent cellulose solvent allowing for a rapid dissolution at moderate temperatures and subsequent shaping into continuous filaments. The highly oriented cellulose fibers obtained upon coagulation in cold water exhibited superior tenacity, exceeding that of commercial viscose and NMMO-based Lyocell (Tencel®) fibers. The respective staple fibers, which have been converted into two-ply yarn by ring spinning technology, presented very high tenacity. Furthermore, the Ioncell yarn showed very good behavior during the knitting and weaving processes, reflecting the quality of the produced yarn. The successfully knitted and woven garments from the Ioncell yarn demonstrate the suitability of this particular ionic liquid for the production of man-made cellulosic fibers and thus give a promising outlook for the future of the Ioncell-F process.

Keywords Circular economy, Colour management, Decolonization, Fibre recycling Paper type Research paper Introduction The annual consumption of textile fibres has increased dramatically during the past decade; from 50 million tons to more than 70 million tons (Floe, 2011). [...]the need for textile fibres is growing, although the possibility to increase the production of e.g. virgin cotton is limited. [...]political pressure will change industrial practices. Since 2016, European Union (EU) legislation has forbidden the landfill disposal of organic materials, including textile wastes. All the previously mentioned methods for colour management do include challenges, and one way to manage the colour in textile waste is first to remove the colour of the waste and then to produce a new colour by dyeing the recycled fibre.