Emerging Trends In Wet Processing
- 1. A PAPER ON EMERGING TRENDS IN WET PROCESSING BY Praveen Pandit & Saurabh Agrawal IV YEAR, TEXTILE TECHNOLOGY SHRI VAISHNAV INSTITUTE OF TECHNOLOGY & SCIENCE,INDORE (M.P.)
- 2. # What are trends ? The general direction in which something tends to move. A general tendency or inclination
- 3. # Why we need new trends in wet processing? ECO-FRIENDLINESS TIME EFFICIENT COST-EFFECTIVENESS IMPROVED FUCTIONAL & AESTHETIC PROPERTIES TO MEET GLOBAL COMPETITION.
- 4. ECOFRIENDLY WET PROCESSING 1. DESIZING. 2. SCOURING. 3. BLEACHING. 4. MERCERISING. 5. DYEING 6. PRINTING. Enzymes Neutralization of liquor
- 5. Dyeing Eco-friendly approach 1. Avoid after treatment with copper or chromium salts to improve fastness. 2. Dye fixing agent based on HCHO should not be used to improve wet fastness of the dyed material. 3. After treatment with cationic dye fixing agent containing less HCHO or HCHO free Product 4. Selection of dyes with high fastness.
- 6. Use of Natural dyes With the recent trend of higher preference for natural dyes, fuelled by increased public awareness about environmental issues and actions like the German ban on use of some synthetic dyes etc.
- 7. Printing On environmental consideration, partial substitution of kerosene and printing gums are quite popular in printing Use of agents such as Zinc sulphoxylate formaldehyde and SnCl2 is to be minimized or better avoided. Apart from these also avoid treatment with hypochlorite for improving whiteness on printed fabrics. In discharge printing avoid the use of SnCl2 and use Rongalite C.
- 9. . Cationisation of cellulose through chemical reaction with compounds containing cationic group have been recommended to control the effluent problem. In addition, the strong dye-fiber interactions resulting from cationizing cotton allow dyeing with no added electrolytes and minimal rinsing and afterwashing.
- 10. A typical cationization process involves the reaction of 3-chloro-2- hydroxypropyl-trimethylammonium chloride (CHTAC) with alkali to form epoxypropyltrimethyl-ammonium chloride (EPTAC) which then reacts with cellulose to form cationic cotton (Dow Chemical).
- 12. Use of ecolabeled chemical & dyes
- 13. Eco-efficiency analysis system. BASF has already analyzed 180 textile dyes and auxiliary chemicals for eco- efficiency.
- 14. Eco- efficiency analyses has been verified by the German technical inspection organization TUV. Certification scheme called TOXPROOF. no health risks are to fear from the product.
- 15. Super critical CO2 dyeing
- 16. The dye is dissolved in circulating CO2 through a chamber containing dye. Dyeing is 0performed for 20-30 minutes under the optimal conditions. CO2 DYE Dye Vessel Dyestuff recovery vessel At the end of the dyeing cycle the system is depressurized and excess dye is collected in a dyestuff recovery vessel
- 17. Function Of CO2 n Dyeing When placed above the critical point (31.1°C and 73 atm) CO2 becomes a remarkable solvent for many natural and synthetic dyes. The dye solution in the supercritical CO2 is carried to the fiber to be dyed. Under certain conditions, the gas-like diffusion of supercritical CO2 disperses the dye evenly into the small pores of fibre
- 18. ADVANTAGES Cheapness Non-explosiveness Non-toxicity Recycling Capability. No Contaminated Wastewater Streams Washing of Dyed Fabric Is Not Necessary Carbon Dioxide Can Penetrate Into Fibre Faster Than Water The Colour Yield Value May Also Be Increased.
- 19. Use of Multi Stage Flash Evaporators
- 22. Technological Trend in wet processing
- 23. Another developing technology for dyeing processes concerns real time concentration monitoring of dye bath components as well as time and temperature parameters. The process uses the flow injection analysis technique to measure individual dye concentrations via spectroscopy (HuMetrix)
- 25. Use of plasma technology PLASMA IONS ELECTR ONS NEURAL PARTICLES
- 26. Depositing plasma NonDeposi ting plasma Exposing the fibres to gaseous plasma Plasmas are applied with the help of saturated & unsaturated gases like ethylene vapors and monomers like acetone and methanol.
- 27. Advantages •No use of hazardous chemicals •No problem of effluents.
- 28. ADAPTABILITY OF NEW TRENDS OF WET PROCESSING IN INDIAN TEXTILE INDUSTRY
- 29. Good infrastructure, Low raw material cost, Easily available manpower at cheap rate. New infrastructure will be required, Need to stick with environmental rules and regulation Boom in textiles may act as fuel for implementation of new trends.
- 30. It is the order of the day so it has become requirement to adopt a positive approach towards textile processing so that the final product at low cost ,in less time with no pollution . So we can say that these are going to be small revolution which can change the scenario of textile industries. CONCLUSION
- 31. $ PROMISE $ Imagine an effort, so clean that it will allow better than present; a !!process so fundamental that it will radically improve our environmental and economical conditions; a process so imminent that most of us will see its impact within our lifetimes. Such is the promise of “Eco-friendly wet processing”.
- 32. References www.appliedseparations.com ATJ ITJ Colourage IJFTR Energy Conservation Case Study Booklet in Textile Industry
- 34. * * * * * ? QUESTIONAIRE