Shirts Made Using Salt Free Dyeing Technology

Description and Salient Features : 

A new salt free dyeing technology was developed using cationic polymer. By using the technology, cotton fabric was dyed with both Chloro triazine and vinyl sulphone based reactive dyes. The newly developed process provided similar dyeing shades as that of already developed one. The advantage of new process is that the total organioc carbon (TOC) and total nitrogen (TN) values of the effluent are 3 times lesser than the already developed one. Cotton has to be pre-treated with cationising chemical before dying. The pre-treated cotton can be dyed without the use of salt. Using salt free technology, 10 times reduction in the TDS of the effluent from 16000 to 1600 ppm, well below the pollution control board nor of 2100 ppm, is achieved. Due to less TDS, effluent treatment does not require installation of RO which can lead to cost effective ZLD process. CIRCOT has completed three scale-up trials for dyeing the cotton fabric using this technology at industrial level and produced cotton woven shirts and T-shirts.  The developed process can be adopted at an industrial level without any modification of existing machinery sequence.

Stakeholders : Rural cotton processor, Textile industries, Start-ups

Benefit to Stakeholders : 

• ICAR-CIRCOT has developed a process protocol by which the use of salt during dyeing of cotton can be completely eliminated. 
• 80% reduction in the chemical use during dyeing Suitable for small scale dyeing industries – reduction in effluent treatment cost 
• Reduction in pollution load leads to adoption of ZLD with less cost 
• 20% more water recovery, 20% saving in time and energy make dyeing sustainable
• Dyeing cost can be reduced by 10%

Cost : --

Production and Marketing : 

Shirts prepared by using salt free dying technology are produced and marketed by ICAR-CIRCOT, Mumbai