Viscose is made from read wood pulp, a renewable natural resource, and has been a preferred fibre application in woman’s fashion wear, menswear in blends and in home textiles. The attributes of this resilient fibre is not only its fluid drape and aesthetic appeal, but also its luxurious comfort.
The latest dye trend for this fibre has developed over the last decade because of industrial pollution, waste problems and global warming. The solution to reducing environmental pollution and waste water discharges in the textile industry is dope-dyed viscose.
Why Dope-dyed Fibres?
Wet processing, a common step in the textile industry, has the potential to cause a significant impact on the environment and on human health. Large amounts of chemicals and dyes are used in wet processing resulting in effluents with a complex chemical composition. On the other hand, the benefits of dope-dyed viscose include sustainability and improved quality.
Greenhouse gas emissions are reduced up to 20 per cent by using spun-dyed viscose, compared to the conventional dyeing of viscose. Waste water generation is reduced up to 10 per cent and a significant reduction is noticed in heavy metal concentrations in the effluent generated by spun-dyed viscose. By adopting dope-dyeing, less chemicals and energy are needed as the process is short and less waste water is generated. This enables direct savings on production costs and ensures substantial reduction of the environmental footprint of the final products.
The quality of Dope-dyed viscose based fabrics have better wash and perspiration fastness (rating of 4-5 for both wash and perspiration fastness against rating of 3 for piece-dyed fabrics) against piece-dyed viscose fabrics though there is no significant difference in rubbing and sublimation fastness. This also results in a cost effectiveness of dope-dyed viscose.
China is planning to introduce an environmental tax on printing and dyeing companies. The law, to enter force during 2018, will be key to fighting pollution. The law will target enterprises and public institutions that discharge listed pollutants directly into the environment.