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Mercerization physical andchemical changes in cotton
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Mercerization physical andchemical changes in cotton

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  • 1. Mercerization Physical changes in cotton
    • Effect of strong caustic soda
    • Fibre swelling
    • Breaking of old bonds
    • Opening of fibre structure
    • Swelling not only in amorphous region but in the intra crystalline region i.e. surface of crystalline region
    • On removal of caustic soda by washing
    • New bonds are formed
    • Extent of H-bonds in intra crystlline region are not to the same extent compared to unmercerized cotton
    • Increase in amorphos content
    • Increase in number of OH groups
    • Both these factors responsible for higher moisture content, increased dye uptake and increased reactivity
    • Amorphous content is more in slack mercerization compared to tension mercerization
  • 2. Increase in Tensile strength
    • Removal of convolutions removes the weak spots at the point of reversal.
    • Alignment of fibres in the new configuration after treatment with caustic soda
    • More parallel and compact due to removal of convolutions
    • Penalization and compactness is much better on application of tension.
    • Improvement in strength is much higher in case of tension mercerization compared to slack mercerization.
  • 3. Mercerization process
    • Yarn mercerization
    • Hank mercerization
    • Warp mercerization
    • Single thread mercerization (Liquid ammonia treatment)
    • Fabric mercerization (Open width only)
    • Woven fabric
    • Knitted fabric
  • 4. Hank mercerization
  • 5. Jaeggli Hank mercerization machine
  • 6. Warp Mercerization
  • 7. Fabric mercerization Padding Mangle
  • 8. Pad chain machine
  • 9. Pad chainless machine
  • 10. Padless chainless machine