Green to Wear Best Technologies
Our Join Life standard classifies those technologies that promote a responsible use of resources during the manufacturing process.
The "Care for Water - Green to Wear Best Technologies" are those that reduce water consumption in at least one manufacturing process. They are the following ones.
Cold pad batch dyeing is a method of dyeing where cold dye is applied to fabric and left for several hours in cold/ambient conditions to allow the dye to fix to the fabric, saving energy consumption compared with others dyeing technologies. Besides, cold pad batch dyeing is a salt-free dyeing process so the wash off of unfixed dye can be done with very small amounts of water and the water, being salt free, is either much less polluting or easier to recycle. However, cold pad batch may only be the appropriate choice from a water and energy perspective where efficient counter-flow wash ranges are used for post-bleach and post-dye wash off. More information about this technology and its environmental benefits can be found in the technical sheet Best Technology: Cold pad batch dyeing.
Dyeing is carried out in machines where fabric/yarn, water and chemicals are mixed together. There are different types of batch dyeing machines and each one operates with a specific liquor ratio. Liquor ratio is the ratio of the weight of the dye bath or other processing bath to the weight of the goods being dyed. Jet dyeing machines operate with low liquor ratio, ≤ 1:5 (for each kilogram of fabric to be dyed, 5 litres of dyebath/water are needed), and, therefore, saves water consumption. Moreover, Jet dyeing machines saves energy and chemical products. More information about this technology and its environmental benefits can be found in the technical sheet Best Technology: Low liquor dyeing machines. An Assessment of low-liquor ratio dyeing machines with efficient washing processes can be found here.
This technology involves the installation of closed system of water recycling to reuse the amount of water consumed in the manufacturing processes. Waste water from wet processes (pre-treatment, dyeing, printing, washing and finishing) is treated to reuse it, totally, in the same wet processes. This way, the amount of water use in the mill is significantly reduced. Once this closed recycling system is installed, the consumption of process water in the mill is minimum and due to evaporation loses. This practice is specially advised if it's supported by a waste water depuration process fed by renewable energies due to the high energy consumption.
Spun dyeing is a dyeing method in which pigment colour is added to the spinning mass solution and the entire body of the fibre is coloured instead of only the fabric surface, as in conventional dyeing. When we dye at this stage of the process, significantly less amount of dye is required. This technology avoids water and energy consumption associated with conventional dyeing process (pre-treatments, dyeing and washing). This means that, about 50% savings in water and energy consumption can be achieved. Besides, chemical products used in pre-treatments, dyeing and washing steps are avoided too. In this way, spun dyeing process generates less amount of wastewater with lower pollution load. More information about this technology and its environmental benefits can be found in the technical sheet Best Technology: Spun Dyeing.
Denim needs, in most cases, to be washed and/or bleached to achieve the desired shade for the garment. Ozone bleaching for denim allows reducing the water consumption during the bleaching process as well as in the following washes. Furthermore, ozone bleaching reduces the amount of chemical products used and it is specially beneficial when permanganate is avoided. More information about this technology and its environmental benefits can be found in the technical sheet Best technology: Ozone Bleaching of Denim.
The "Care for Planet- Green to Wear Best Technologies" are those that that reduce the emission of hazardous chemicals during the manufacturing process. They are the following ones.
The Leather Working Group (LWG) was formed in 2005 with the aim of promoting sustainable environmental practices within the leather supply chain. For this end, the LWG has created a protocol, updated periodically, to assess the compliance and environmental practices of leather manufacturers, providing good practices and guidelines for continuous improvement. This protocol allows to classify leather manufactures according to their environmental performances as Gold, Silver and Bronze. Leather Working Group Gold category is the highest for a good environmental practice.
The use of renewable energy allows, not only to reduce the consumption of non-renewable natural resources, but also to reduce the amount of GHG emissions and its impact on climate change. The Green to Wear Standard of environmental sustainability includes the following best technologies involving renewable energy:
- Generate and use more than 80% of the thermal energy that consumes the mill through renewable energy.
- Generate and use more than 40% of the electrical energy that consumes the mill through renewable energy.
In case of using biomass as renewable source, the biomass must comply with the Inditex’s Forest Product Policy.