Denim washing


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Denim washing

  1. 1. DENIM WASHING(A value addition process)<br />Submitted to- submitted by-<br />Mr. Vasant Kothari Mr. Harmendarkothari<br /> M.F.Tech-2<br />
  2. 2. Contents<br />Introduction<br />Types of washes<br />Chemical washes<br />Mechanical washes<br />Cost <br />References<br />
  3. 3. Introduction<br />Denim washing is know as one of the finishing treatment that has vast usage because of creating special appearance and updating clothes<br />There is different methods of denim washing.<br />
  4. 4. On the base of chemical use<br />
  5. 5. On the bases of water use<br />
  6. 6. A. Chemical washes-<br />1. Enzyme Wash(Bio Stoning)-<br /><ul><li>Cellulase enzymes are natural proteins which are used
  7. 7. It attacks on 1,4-beta-glucoside bond of cellulose molecule</li></ul> e.g. Denim ax PB/BT<br />
  8. 8. optimized pH and temperature = maximum activity of the enzyme<br />
  9. 9. 2. Acid Wash-<br /> It is done by tumbling the garments with pumice stones presoaked in a solution of sodium hypochlorite or potassium permanganate for localized bleaching resulting in a non uniform sharp blue/white contrast.<br />Results depends on:-<br />-Fabric -chemical used(conc.)<br />-Stone(quantity) -machine used<br />
  10. 10. Limitations of acid wash:<br /><ul><li> Tendency to be yellowish
  11. 11. incomplete reduction gives create problem</li></ul>Remedy:<br /> Manganese is effectively removed during laundering with addition of reducing agent(sodium bisulfate,1-5gpl, 50 deg. Cent.,20mins)<br />-<br />
  12. 12. 3.Denim Bleach-<br />To decolorize the dark shade into light shade by destroying indigo.<br /> INDIGO --------------------------. ISATIN<br />(oxidative bleaching agent)<br />Chemicals-<br /><ul><li>sodium hypochlorite
  13. 13. KMnO4
  14. 14. Hydrogen peroxide</li></li></ul><li> Discoloration produced is usually more apparent depending :-<br /><ul><li>On strength of the bleach liquor
  15. 15. On bleach liquor quantity
  16. 16. On temperature and
  17. 17. On treatment time.</li></ul>Drawback-<br /> Harmful to human health and causes corrosion to stainless steel.<br />
  18. 18. 3-E Bleaching concept for denim-<br /><ul><li> Bleaching with sulphiric acid derivatives, and recently with laccase(enzyme).
  19. 19. Technology in based on a Laccase(a redox enzyme using mol. Oxygen as electron acceptor) and mediator.
  20. 20. eg. DeniLite(enzyme + PPT)</li></li></ul><li>Other chemical washes-<br />
  21. 21. B. Mechanical washes-<br />Stone washing-<br />Pumice stones give the additional effect of a faded or worn look<br />Stone wt. /fabric wt. = 0.5 to 3 /1<br />Dia.of stone-1-7 cm<br />Pumice stone<br />
  22. 22. Recommended Specification for Stones-Moisture content-less than 5%Surface properties-less than 5% finesApparent Density-0.5-0.75gm/cm3Abrasion loss-35%Impurities –when exceed 10% they increase apparent density1 gm/cm3, the stone will not float in water during process.<br />
  23. 23. 2. Sand blasting:-<br />Sand blasting technique is based on blasting an abrasive material in granular, powdered or other form through a nozzle at very high speed and pressure onto specific areas of the garment surface.<br />product look<br />process<br />
  24. 24. 3.Whiskering-(Cat's Whiskers)<br />Industrially done with laser, sandblasting, machine sanding, hand sanding and rods.<br />'knee whiskers' -whiskers on the sides of knees <br />‘honeycombs' -crease marks on the back of the knee<br />honeycomb<br />Whiskers on skirt<br />
  25. 25. Other mechanical washes-<br />
  26. 26. Laser technology<br />grinding<br />Scrubbing<br />Tagging on pockets<br />
  27. 27. Costing-<br />
  28. 28. 1.www.fibre2fashion.com2.Washing Report of Arvind Mills3.Denim garment washing process-ATIRA4.Denim garment processing –Express Textile(march 2003)5.Garment washing & finishing- Pearl Academy of Fashion <br />