Summary


Oligomer: summing up


The complete removal of the oligomers is not possible.However, they can be partly eliminated using speciality chemicals in dyeing,reduction clearing of dark/ heavy dark polyester fibre in acidic medium, properfinish having less affinity for the oligomers, and regular machine cleaning.Here are some things to remember:


  • Clean machine periodically
  • Use of high liquor ratio
  • Avoid prolonged treatments at 1300°C and frequent/sudden temperature changes
  • Use oligomer dispersants during dyeing
  • Drain the bath at highest possible temperature

 

Summing up Polyester processing


All good things are difficult to achieve


People in the Textile processing industry are no differentthan this boat. It is moving despite facing the resistance from the waves andthe flow of current.


Similarly, we have to solve problems faced in day-to-dayprocessing as and when it occurs. Despite the best possible process controlsand control over dye quality and weighing, problems still persist. Identificationof the precise cause of fault is not always easy on the shop floor whereproduction is given a priority over quality. Very often the precise cause ofthe fault is difficult to identify from the dyed fabric.


So, let me conclude by saying that attention to thesefactors. They alone can help you reduce the problems and discover remedies toprocessing problems:

  • Chemicals used in the processing
  • Method of dyeing, printing, pretreatment and finishing
  • Machinery used for all the processing
  • Selection of right types of disperse dyes and right dye auxiliaries


After the globalization of the textile industry in 2004 itis now even more important to stay competitive in the world textile market, bycost reduction which can only be achieved by right first time and eliminatingall the shop-floor problems in the polyester processing.


References


  • ND Iyer, 'Polyester the most versatile synthetic fibre', Colourage, 01 September to 04 February (series of 26 articles)
  • AK Samnta, 'Road map for wet processing of micro denier polyester fabric and relevant studies on its dyeability', Man Made Textiles, October '03
  • Dr Bharat Desai, Oligomer control in polyester fibre processing, Colourage June 05
  • Prof VA Shenai, Technology of dyeing
  • Mr CN Sivaramkrishnan, 'Dispersing Agent', Colourage, September '05
  • AD Sule, 'Practical Problems in dyeing of polyester off shades', Man Made Textiles, December 03
  • Search engine 'google.com'


Theauthor is associated with Resil Chemicals, Ahmedabad