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cotton dyeing

  1. 1. Dye the cotton yarn<br />Submitted to- Submitted by-<br /> Mr. VasantkothariHarmendarkothari<br />Sujithpraveen<br /><br />
  2. 2. Introduction-<br /><ul><li>Dyes are used for coloring the fabrics.
  3. 3. Dyes are molecules which absorb and reflect light at specific wavelengths to give human eyes the sense of color.
  4. 4. Dyeing is a method which imparts beauty to the textile by applying various colors and their shades on to a fabric.</li></li></ul><li>About Cotton-<br /><ul><li>Cotton :natural, plant, seed ,cellulosic fiber
  5. 5. Known as “king of fibers”</li></li></ul><li>Dyes for cotton-<br />
  6. 6. Classification of dyes-<br />
  7. 7.
  8. 8.
  9. 9.
  10. 10.
  11. 11. Reactive dye on cotton-Mechanism<br />
  12. 12. Reactive dye on cotton-process flow<br />
  13. 13. Methods for dyeing-<br />
  14. 14. A) Batch yarn Dyeing<br />1.Package dyeing method-<br /><ul><li> yarns are wound on spools, cones or similar units
  15. 15. packages of yarn are stacked on perforated rods in a rack and then immersed in a tank
  16. 16. dye is forced outward from the rods under pressure through the spools and then back to the packages</li></li></ul><li>
  17. 17. Remedies for problems in yarn package dyeing:<br /><ul><li>Package density
  18. 18. Angle of winding
  19. 19. Package size
  20. 20. Perforation of spindle
  21. 21. M:L Ratio
  22. 22. Pump pressure
  23. 23. Entrapped air
  24. 24. pH, Temp. & Time</li></li></ul><li>2.Hank dyeing method-<br /><ul><li>The yarns are loosely arranged in skeins or coils.
  25. 25. These are then hung over a rung and immersed in a dyebath in a large container.
  26. 26. The colour penetration is the best and the yarns retain a softer, loftier feel. </li></li></ul><li>Process sequence for yarn dyeing in hank form<br />
  27. 27. 3.Beam yarn Dyeing-<br /><ul><li> It is similar to package dyeing but more economical.
  28. 28. The yarn/fabric is wound on to a perforated warp beam and then immersed in a tank for dyeing it applying pressure.</li></li></ul><li>B)Continious yarn dyeing method<br />1. Rope dyeing-<br /><ul><li>Its continuous yarn dyeing machine .
  29. 29. Uses for indigo and sulphur dyes on cotton yarn for denim </li></ul>fabrics<br /><ul><li>Yarn is dyed in the form of rope</li></li></ul><li>Process chart-<br />
  30. 30. 2.Slasher dyeing –<br /><ul><li>dye the grey yarn in sheet form followed by sizing in a continuous manner and get weavers beam
  31. 31. Dye the yarn in sheet form so known as a “Sheet Dyeing”
  32. 32. Uses for indigo and sulphur dyes on cotton yarn for denim </li></ul>fabrics<br /><ul><li>Also known as “Dyeing cum sizing”</li></li></ul><li>Process flow-<br />
  33. 33.
  34. 34. Comparative study-<br />
  35. 35. Cost for cotton yarn dyeing<br />
  36. 36.<br /><br /><br />Books-<br />1.Dyeing technology-V.A shennai<br />2.textile processing-NCUTE<br />
  37. 37. Thank you<br />