Requirements of Sizing | Factors Considered Before the Selection of Size Ingredients | Name of Some Natural & Synthetic Sizing Agents

Requirements of Sizing
In order to ensure good technological properties of sized warps, the following requirements should be met in size:

  1. Sized warp must be sufficiently strong, smooth & elastic.
  2. The sizing process must ensure the application of the required amount of size on the yarn or the required size regain.
  3. The tension of the warp yarns at sizing must be regular & constant during all the time of warp unwinding from the warping beams.
  4. Yarn stretch & loss in elongation should be within admitted limits.
  5. The package, i.e the weavers beam produced must have a cylindrical shape, the necessary winding density & the yarn length.
  6. The sizing process must be efficient, economical & must ensure the production of high quality sized warp.
Factors Considered Before the Selection of Size Ingredients
Before selecting the size ingredients the following factors must be considered:

  1. It must be Non-degrading to the yarn.
  2. It must be compatibility with equipment.
  3. It must be easily removal, if necessary.
  4. Provides good fabric characteristics if not removed.
  5. Least amount of dusting-off during weaving.
  6. Cost of the size ingredients must be less.
  7. It should not modify the tone of colored warps.
  8. No skimming tendency.
  9. Easily prepared.
  10. Lack of odor.
  11. No beam blocking.
  12. Compatible with other ingredients.
  13. Neutral pH.
  14. Insensitive to high heat.
  15. Rapid drying.
Name of Some Natural & Synthetic Sizing Agents 
Natural sizing agents:
Natural sizing agents are based on natural substances & their derivatives.
  • Starch & starch derivatives: native starch, degradation starch & chemical modified starch products.
  • Cellulosic derivatives: carboxymethylcellulose (CMC), methylcellulose & oxyethylcellulose.
  • Protein-based starch: glue, gelatin, albumen
Synthetic sizing agents:
  • Polyacrylates
  • Modified polyester
  • Polyvinyl alcohols (PVA)
  • Styrol/maleic acid copolymers


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