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Polyester Spandex Denim
In such denims, the polyester used in warp is kept low about ****5%, because the blend is harder to dye than cotton. Polyester can be used in much higher percentage in filling. It has the advantage of being strong, durable and even in appearance.
 
Properties of Polyester

• Moisture Regain
  
  At *5% RH and *0 deg F*-> 0.4%
  
  Because of low moisture regain, it develops static charge. Garments of polyester fibres get soiled easily during wear.
   
• Thermal Properties
  
  Polyester fibres are most thermally stable of all synthetic fibres. As with all thermoplastic fibres, its tenacity decreases and elongation increases with rise in temperature. When ignited, polyester fibre burns with difficulty.

• Shrinkage
  
  Polyester shrinks approx 7% when immersed in an unrestrained state in boiling water. Like other textile fibres, polyester fibres undergo degradation when exposed to sunlight.
  
  Its biological resistance is good as it is not a nutrient for microorganisms.
   

• Swelling and Dissolving
  
  The fibre swells in 2% solution of benzoic acid, salicylic acid and phenol.
  
  Alcohols, Ketones, soaps, detergents and dry-cleaning solvents have no chemical action on polyester fibres.
   

• Chemical Resistance
  
  Polyester fibres have a high resistance to organic and mineral acids. Weak acids do not harm even at boil. Similarly strong acids including hydrofluoric acids do not attack the fibres appreciably in the cold.
  
  Uses of Polyester
  
  1. Woven and Knitted Fabrics, especially blends.
  2. Conveyor belts, tyre cords, tarpaulines etc.
  3. For filling pillows
  4. For paper making machine
  5. Insulating tapes
  6. Hose pipe with rubber or PVC
  7. Ropes, fish netting and sail cloth.