Ozone fading in denim and jeans washing
Global demand for jeans has been projected to reach $56.2 billion this year.
Manufacturers achieve these finishes with water, chemicals, enzymes and pumice stones. According to Levi Strauss & Co., the average pair of jeans uses 42 liters of water in the finishing process.
But some factories using 20 liters to 60 liters of water to finish each pair. Meanwhile, 900 million people lack access to clean water.
Forward-thinking brands and manufacturers are seeking alternatives to water, chemicals and stones for achieving the faded look consumers crave. There has been found brands advertising low water, low chemical and no chemical finishes directly to the consumer.
Two water-saving, bleaching technologies are commercially viable today: laser and ozone.
We are discussing Ozone fading in denim jeans washing
Ozone technology harnesses the natural bleaching capabilities of ozone gas to give a range of overall and specialty bleach effects with substantially reduced environmental impact.
This uses to clean pocket back staining from normal washing processes, or to bleach denim to a lighter shade.
Using this technique, the garment tin strength out live bleached. Bleaching of denim garment is done inwards a washing machine alongside ozone dissolved inwards water..
Ozone does not eliminate water use in jeans finishing. However, it substantially reduces consumption of water as well as energy, chemicals, enzymes and stones. Ozone offers important advantages over traditional wet finishing.
Oxygen (O2) is converted to ozone gas (O3), jeans are dampened, exposed to the ozone, and rinsed; the ozone is reconverted to ordinary oxygen before release into the environment. While chemical bleaching or stonewashing uses six to seven washes and rinses, ozone finishing requires two to three. A production manager I spoke with reported more than 50 percent reductions in water, chemicals and pumice stone consumption when using ozone finishing in sequence with reduced traditional wet finishing methods.
The advantages of this methods are:-
There is minimum loss of strength
Ozone finishing reduces energy and water consumption. Furthermore, replacing some traditional finishing with ozone reduces effluent, including the sludge pumice stones create.
Ozone bleaches more quickly than chemicals and stonewashing. Ozone can clean back stains in three seconds. At optimum concentrations, it bleaches denim in 15 minutes to levels commonly desired by fashion today, versus 30 to 45 minutes with traditional methods.
Ozone increases production per shift.
Ozone technology reduces environmental impact, processing costs and processing times while achieving desirable fashion looks.
Safety, Quality, Performance. Companies considering investment in ozone technology should consider three factors: safety, quality, and performance. Proper ozone bleaching systems are comprised of a filtered/refrigerated air compressor, oxygen concentrator, ozone generator, exposure chamber and ozone destruct unit. Specific equipment features affect the safety and reliability of ozone denim processing equipment.
The disadvantages of this methods are:-
Ozone Fading Based on molecular weight calculation One gram of ozone could destroy 10.9 gram of indigo dye.
The ozone induced oxidation of indigo produces certain compounds which are isatin, anthranilic acid, and the complex of the two products. which is yellow in color. Ozone induced yellowing is a major problem on denims.
This is due to the suns UV radiation. The increased concentration of NOx and SOx gases due to pollution can potentially react with ozone and reduce its concentration tremendously in the ozone layer. As a result a portion of the suns UV radiation reaches to the earths surface and generates ozone gas from the atmospheric oxygen.
The factors influenced in the yellowing of indigo dyed garments:
- Position of the dyestuff in the fiber
- Absorption and diffusion of moisture in to the fiber
- Humidity protective chemicals on the fiber
- Ozone concentration;