Water Footprint of Recycled Fibre is Around 2% of that of Virgin Cotton
Published on by Water Network Research, Official research team of The Water Network in Technology
The method developed at VTT Technical Research Centre of Finland involves dissolving worn and discarded cotton and using it as a raw material for new fibre. The water footprint of the recycled fibre is around 2% of that of virgin cotton and 10% of viscose.
Image source: VTT
The first product models demonstrate that recycled fibre can be transformed into a yarn and pleasant fabric. Based on a carbamate dissolution process, the technology has been used to produce the first batch of recycled fibre in a pilot facility.
The fabric made from the recycled fibre met the researcher's expectations: it is smooth with a subdued matt finish and drapes nicely. Ali Harlin and Pirjo Heikkilä of VTT say that the fibre feels natural.
Carbon disulphide-free
The method is much friendlier to the environment than the viscose process, in which carbon disulphide is needed for dissolution. In addition, polyester residues are removed from the cotton material using methods familiar from the pulp industry.
According to calculations during the technology commercialisation project, the carbon footprint of recycled fibre produced using carbamate technology is about a third smaller than for cotton and in the same category and as the most environmentally friendly viscose. The water footprint of the recycled fibre is around 2% of that of virgin cotton and 10% of viscose.
Yarn was spun at Tampere University of Technology from discarded cotton turned into fibre in VTT's laboratory. The fibre's characteristics rivalled those of commercial yarns when being spun. Following this stage, the first model products, gloves and flat-knitted fabrics, were made by knitwear company Agtuvi.
R&D will continue at the Infinited Fiber Company
R&D is still required in order to achieve process reliability. The Infinited Fiber Company startup has been established to advance the process design and licensing of the technology.
The spinning process is being developed towards industrial production through collaboration between VTT and the Infinited Fiber Company at VTT's Bioruukki pilot centre. A range of cellulose fibres may be developed at a spinning unit built at Bioruukki this summer.
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Taxonomy
- Water Footprint
- Water Footprint Research
- Consumption
- Fibers & Textiles
- Recycling
- Textile Machinery