Circular Economy & Recycling

NaOH pretreatment of mixed-fiber textiles - a design of experiment study

The paper describes, In this study, recipe optimizations of the reactive digital printing process were made with the digital printing machine investment made for the first time.The presentation shows…. It has been determined that the visual quality of the

Saal A
Donnerstag, 14.09.2023, 09:00 - 09:25 Uhr
Katharina Steiner et al, Kompetenzzentrum Holz GmbH, Linz (AUT)
A. Bartl, TU Vienna, Tulln (AUT)
D. Ribitsch, BOKO Wien, Tulln (AUT)

An increased production and consumption of textiles with a simultaneous shortening of their lifespan has led to a serious waste problem. While fiber recycling of unblended natural and synthetic fiber is already possible solutions for mixed-fiber textiles are still required. One potential approach is to degrade the minor component of the mixed-fiber textile enzymatically and further reprocess the major component to new fibers. Cellulases have been successfully applied for cellulose degradation within cellulose/polyester mixed-fiber textiles but further optimisation is needed to obtain an economic viable process. Characteristically, cellulose records a high crystallinity, which is generally known to complicate its digestibility. To overcome this problem, a pretreatment e.g. with acids or alkalis, to generate amorphous cellulose and increase its conversion rate is mandatory. In this study alkaline pretreatment of mixed-fiber textiles has successfully been optimised using a central composite design. A special focus was thereby set to additives as urea or ultrasonic pulses.