A critical review of manufacturing processes used in regenerated cellulosic fibres: viscose, cellulose acetate, cuprammonium, LiCl/DMAc, ionic liquids, and NMMO based lyocell

It is essential for textile manufacturing industries to invent new resources, composites and industrial technologies, which are environmentally acceptable and can fulfill the consumer necessities. Therefore, in the recent years, large number of research is focused on optimizing and modifying the fibre manufacturing processes. The recent advances in technology have allowed modifying these processes through various techniques and novel raw materials/additives to manufacture the fibres. Among the various fibre regeneration processes, the NMMO based lyocell process has numerous advantages over conventional rayon fibres and it has great potential to fulfil the environmental and customer requirements. The present review delivers a complete account of all the six types of cellulose regeneration processes namely viscose, cellulose acetate, cuprammonium, LiCl/DMAc as well as lyocell processes based on ionic liquid or NMMO. Additionally, the review considers latest developments with process technology, cellulose swelling and dissolution phenomena, factors affecting the lyocell process and future prospects of the lyocell fibres.