Production and recycling of dope-dyed Ioncell fibers

Room C
Thursday, 09/11/2025, 11:50 - 12:10

Dope-dyeing of Lyocell fibers can achieve fabrics with high color strength at substantially reduce environmental impact. Furthermore, these fibers can be chemically recycled without almost any color loss.

Speakers
Michael Hummel (Aalto University)
Co-Author
Nicole Nygren (Aalto University), Inge Schlapp-Hackl (Aalto University)
Herein, we present the production of dope-dyed Lyocell-type fibers produced with the IoncellĀ® technology. Vat and pigment dyes were used to produce fibers and fabrics of high color strength and excellent fastness properties. Further, pigment dyes were identified as superior when it comes to chemical recycling of the spun fibers to produce new Lyocell fibers of similarly high color strength, without the need for additional dye stuff.