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Shrinkage finishing for cellulosic fabrics


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Shrinkage finishing for cellulosic fabrics

  1. 1. Shrinkage Finishing (Cellulosic Fabric) PRESENTED BY: DILIP SINGH KUMAR SARVESH RAJEEV SHARAN DFT(AP-06)
  2. 2. Shrink Proof Finishing Technique using Ultra High Pressure Woven & knitted fabrics
  3. 3. Shrink Proof Finishing Technique using UltraHigh Pressure • “Due to the various problems of the environmental pollution, new techniques were examined as the method to decrease of the dyestuff and chemical agent in the dyeing and finishing processes.”
  4. 4. Shrink Proof Finishing Technique using UltraHigh Pressure • The technique of shrink proof finishing to the cellulosic fibre was investigated using high pressure over 100MPa. • The shrink of cellulosic fibre was controlled by high pressure treatment. • Furthermore, owing to adding urea and thiourea, the ratio of shrink was reduced to half values.
  5. 5. Shrink Proof Finishing Technique using UltraHigh Pressure • The results of evaluation concerning to comfortableness property and handling property of fabric showed that the water vapour permeability of fabric was little affected by the high pressure treatment and the handling properties based on pure bending and shearing stresses was affected by the high pressure treatment.
  6. 6. Shrink Proof Finishing Technique using UltraHigh Pressure Wet processing technology • the fabrics are pressurized with the help of high pressure water streams. DEGREE OF PERMANANCE • Durable finish. END USES • Active wears, sports wears and functional wears
  7. 7. Shrink Proof Finishing Technique using UltraHigh Pressure PROCESS • The mechanical members (high pressure water jets) come into contact with the textile piece and, during such contact, modify the structure that said piece had either after weaving or knitting or possibly after the finished article has been made, most often by a relative displacement of the yarns constituting the piece, or of the discontinuous fibres or continuous filaments constituting said yarns.
  8. 8. Corona Discharge Woven fabrics
  9. 9. Corona Discharge• Dry processing technique• Can withstand up to 30 washing cycles. PROCESS• Corona treatment consists on the application of an electrical discharge of high voltage (around 10.000 V) through air between two electrodes, using frequencies around 40 kHz, at normal atmospheric temperature and pressure, on dry cotton fabric.
  10. 10. Corona Discharge
  11. 11. Corona Discharge• Cotton Fabrics that treated with corona discharge have less shrinkage level exposed to washing process than untreated. Shrinkage in weft section is higher than warp. With respect to same structural characteristics of warp and weft yarns, above difference referred to conditions in weaving processes and finally synthesis. By increasing of irradiation (passage round), the shrinkage decreased after washing.
  12. 12. Corona Discharge
  13. 13. Foam Finishing Woven fabrics
  14. 14. Foam Finishing• A wet-processing technology which uses air instead of water as the primary diluents has been developed.• The foam process is currently used in plants for shrinkage control, durable-press finishing, and softener application to a variety of cotton and polyester/cotton blend fabrics.
  15. 15. Foam FinishingPROCESS• The process consists of mechanically foaming a suitably formulated finish or dye formulation and then applying the foam to textile fabrics. Collapse of the foam distributes the finish on the substrate.• The fabric is then subjected to conventional drying and fixing operations.
  16. 16. Foam FinishingDEGREE OF PERMANANCE• Durable finishADVANTAGES • The main advantage of the foam process resides in the substantial energy savings achievable in the drying of fabrics due to the replacement of water with air in the finish. • In addition, in certain cases line speeds have been doubled.END USES• Active wears, casual wears, sports wears and functional wears
  17. 17. Zero/Zero finishCompressive shrinkage- Woven fabrics
  18. 18. Zero/Zero finish• During spinning, weaving, bleaching, dyeing and various finishing processes, yarns and fabric are under a continuous tension.• The process is Controlled Compressive Shrinkage and also known it as SANFORIZED.• The process is a purely mechanical treatment without any addition of chemicals.
  19. 19. Zero/Zero finish• The process is a purely mechanical treatment without any addition of chemicals.• The amount of potential wash shrinkage must be determined prior to shrinking.
  20. 20. Zero/Zero finish• A full width sample is wash-tested according to the test method• After the lengthwise and widthwise shrinkage has been determined, the compressive shrinkage machine can be adjusted accordingly
  21. 21. Plasma Processing Woven & knitted fabrics
  22. 22. Plasma Processing • Surface-sensitive method that allows selective modification in the nm-range. • By introducing energy into a gas, quasi-neutral plasma can be generated consisting of neutral particles, electrically charged particles and highly reactive radicals.
  23. 23. Plasma Processing PRINCIPLE • The plasma atmosphere consist of free electrons, radicals, ions, UV-radiation and a lot of different excited particle in dependence of the used gas. Different reactive species in the plasma chamber with the substrate surface. Cleaning, modifications or coating occurs dependent of the used parameter.
  24. 24. Plasma Processing Wet processing technique. • The plasma treatment is efficient only on a level of the first surface layer, no damage to the physical properties intrinsic to the textile are noticed. • DEGREE OF PERMANENCE • Effects of this plasma treatment on surfaces are significant and uniform along the length and width, and they last a long time.
  25. 25. Plasma Processing PROCESS • Textile to be functionalized is placed in a reaction chamber with any gas and the plasma is then ignited, the generated particles interact with the surface of the textile. • A gas (air, oxygen, nitrogen, argon, carbon dioxide and so on), injected inside a reactor at a pressure of approximately 0.5 mbar, is ionised by the presence of two electrodes between which is a high-frequency electric field.
  26. 26. Plasma Processing PROCESS • The need to create the vacuum is justified by the necessity to obtain a so-called cold plasma with a temperature no higher than 80 C. This, with the same energy content that can be reached at atmospheric pressure at a temperature of some thousands of degrees C, permits the treatment of fabrics even with a low melting point such as polypropylene and polyethylene, without causing any form of damage.
  27. 27. Plasma Processing PROCESS • In this way the surface is specifically structured, chemically functionalized or even coated with nm-thin film depending on the type of gas, simultaneously filling the gaps between the structure/construction of the fabric, and control of the process.
  28. 28. Plasma Processing END USES • It follows from the very interesting applications of the plasma treatment that also applications of nonwovens have become apparent, having a destination of use among other things in air and liquid filtering, synthetic leather, cloths, artificial limbs, biomedical and protective wear, footwear and sportswear.
  29. 29. Plasma Processing a) A nonwoven substrate before plasma treatment b)The same nonwoven substrate after plasma treatment
  30. 30. Plasma Processing
  31. 31. Nano-CareWoven fabrics
  32. 32. Nano-Care• Technology that brings about an entirely carefree fabric with shrink proof, wrinkle resistant, water and stain repellent properties, intended for use in cellulosic fibers such as cotton and linen
  33. 33. Nano-CareDEGREE OF PERMANANCE• Permanent finish.END USES• men’s, women’s and children’s trousers, active wear, uniform, shirting and business attire.• residential and commercial interiors industry ranging from mattress fabrics to stadium seating