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Finnish research centre turns waste cotton into fibre
24
Sep '15
Old worn-out cotton clothing can be turned into new fibres for the textile industry using a cellulose dissolution technique developed by VTT Technical Research Centre of Finland.

A group of Finnish organisations have launched a project in the course of which the new production technique will be tried out in practice at all stages of the value chain during 2015 and 2016, VTT said on its website. Cellulose wet-spinning is due to begin at VTT's pop-up plant in Finland in October. The first clothing line made of the new recycled fibres will be out towards the end of 2016.

Advancements in recycling technology are challenging both consumers and businesses: Organic waste in the form of clothing may as of 2016 no longer be disposed of by landfill. The Circular Economy of Textiles (TEKI) project is aimed at piloting and modelling a closed-loop ecosystem in line with the principles of the circular economy, which will form the basis of a new way to make industrial use of textile waste that cannot be reused.

For the purpose of the TEKI project, VTT and Ethica have brought together a group of Finnish organisations representing different activities in the value chain. The common goal of the organisations is to promote the recycling of textiles while adding value to their business activities or creating new business. Ethica's role in the project is to research and model the potential of a closed-loop textile ecosystem more comprehensively and to gauge consumers' interest in operating models that are based on the principles of circular economy and recycled materials. The project also aims to study the technological requirements of dissolution-based recycling.

Cotton that is not suitable for reuse can be dissolved to make cellulose solution, which can be turned into new fibre. Cellulose fibre can be produced using the same technique and equipment as has been used to make viscose fibre for decades, but the new production technique is considerably more environmentally friendly than the technique used for viscose, as no carbon disulphide is needed in the dissolution process. Compared to virgin cotton, the new technique also reduces the water footprint by more than 70 per cent and the carbon footprint by 40–50 pr cent, VTT claimed.

"The wet-spinning phase of the project is due to begin in a month's time in a factory in Valkeakoski that has not been in use for a couple of years. Work done prior to this phase involves processing and dissolving pre-processed waste textiles. This is the first time that cellulose solution made from recycled materials is being wet-spun in an industrial scale. The fibre will be used to make new knitted fabrics", said VTT's Senior Scientist Pirjo Heikkilä, who is responsible for coordinating the TEKI project. (SH)

Fibre2Fashion News Desk – India


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